/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2016 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* @OSF_FREE_COPYRIGHT@
*
* Author: Bryan Ford, University of Utah CSS
*
- * Thread_Activation management routines
+ * Thread management routines
*/
-#include <cpus.h>
-#include <task_swapper.h>
+#include <mach/mach_types.h>
#include <mach/kern_return.h>
-#include <mach/alert.h>
-#include <kern/etap_macros.h>
+#include <mach/thread_act_server.h>
+
+#include <kern/kern_types.h>
+#include <kern/ast.h>
#include <kern/mach_param.h>
#include <kern/zalloc.h>
+#include <kern/extmod_statistics.h>
#include <kern/thread.h>
-#include <kern/thread_swap.h>
#include <kern/task.h>
-#include <kern/task_swap.h>
-#include <kern/thread_act.h>
-#include <kern/thread_pool.h>
#include <kern/sched_prim.h>
#include <kern/misc_protos.h>
#include <kern/assert.h>
#include <kern/exception.h>
#include <kern/ipc_mig.h>
#include <kern/ipc_tt.h>
-#include <kern/profile.h>
#include <kern/machine.h>
#include <kern/spl.h>
#include <kern/syscall_subr.h>
#include <kern/sync_lock.h>
-#include <kern/sf.h>
-#include <kern/mk_sp.h> /*** ??? fix so this can be removed ***/
-#include <mach_prof.h>
-#include <mach/rpc.h>
+#include <kern/processor.h>
+#include <kern/timer.h>
+#include <kern/affinity.h>
+#include <kern/host.h>
-/*
- * Debugging printf control
- */
-#if MACH_ASSERT
-unsigned int watchacts = 0 /* WA_ALL */
- ; /* Do-it-yourself & patchable */
-#endif
+#include <stdatomic.h>
-/*
- * Track the number of times we need to swapin a thread to deallocate it.
- */
-int act_free_swapin = 0;
+#include <security/mac_mach_internal.h>
+
+static void act_abort(thread_t thread);
+
+static void thread_suspended(void *arg, wait_result_t result);
+static void thread_set_apc_ast(thread_t thread);
+static void thread_set_apc_ast_locked(thread_t thread);
/*
- * Forward declarations for functions local to this file.
+ * Internal routine to mark a thread as started.
+ * Always called with the thread mutex locked.
*/
-kern_return_t act_abort( thread_act_t, int);
-void special_handler(ReturnHandler *, thread_act_t);
-void nudge(thread_act_t);
-kern_return_t act_set_state_locked(thread_act_t, int,
- thread_state_t,
- mach_msg_type_number_t);
-kern_return_t act_get_state_locked(thread_act_t, int,
- thread_state_t,
- mach_msg_type_number_t *);
-void act_set_apc(thread_act_t);
-void act_clr_apc(thread_act_t);
-void act_user_to_kernel(thread_act_t);
-void act_ulock_release_all(thread_act_t thr_act);
-
-void install_special_handler_locked(thread_act_t);
-
-static zone_t thr_act_zone;
+void
+thread_start(
+ thread_t thread)
+{
+ clear_wait(thread, THREAD_AWAKENED);
+ thread->started = TRUE;
+}
/*
- * Thread interfaces accessed via a thread_activation:
+ * Internal routine to mark a thread as waiting
+ * right after it has been created. The caller
+ * is responsible to call wakeup()/thread_wakeup()
+ * or thread_terminate() to get it going.
+ *
+ * Always called with the thread mutex locked.
+ *
+ * Task and task_threads mutexes also held
+ * (so nobody can set the thread running before
+ * this point)
+ *
+ * Converts TH_UNINT wait to THREAD_INTERRUPTIBLE
+ * to allow termination from this point forward.
*/
+void
+thread_start_in_assert_wait(
+ thread_t thread,
+ event_t event,
+ wait_interrupt_t interruptible)
+{
+ struct waitq *waitq = assert_wait_queue(event);
+ wait_result_t wait_result;
+ spl_t spl;
+
+ spl = splsched();
+ waitq_lock(waitq);
+
+ /* clear out startup condition (safe because thread not started yet) */
+ thread_lock(thread);
+ assert(!thread->started);
+ assert((thread->state & (TH_WAIT | TH_UNINT)) == (TH_WAIT | TH_UNINT));
+ thread->state &= ~(TH_WAIT | TH_UNINT);
+ thread_unlock(thread);
+
+ /* assert wait interruptibly forever */
+ wait_result = waitq_assert_wait64_locked(waitq, CAST_EVENT64_T(event),
+ interruptible,
+ TIMEOUT_URGENCY_SYS_NORMAL,
+ TIMEOUT_WAIT_FOREVER,
+ TIMEOUT_NO_LEEWAY,
+ thread);
+ assert(wait_result == THREAD_WAITING);
+
+ /* mark thread started while we still hold the waitq lock */
+ thread_lock(thread);
+ thread->started = TRUE;
+ thread_unlock(thread);
+ waitq_unlock(waitq);
+ splx(spl);
+}
/*
* Internal routine to terminate a thread.
- * Called with task locked.
+ * Sometimes called with task already locked.
*/
kern_return_t
thread_terminate_internal(
- register thread_act_t thr_act)
+ thread_t thread,
+ thread_terminate_options_t options)
{
- thread_t thread;
- task_t task;
- struct ipc_port *iplock;
- kern_return_t ret;
-
-#if THREAD_SWAPPER
- thread_swap_disable(thr_act);
-#endif /* THREAD_SWAPPER */
-
- thread = act_lock_thread(thr_act);
- if (!thr_act->active) {
- act_unlock_thread(thr_act);
- return(KERN_TERMINATED);
+ kern_return_t result = KERN_SUCCESS;
+ boolean_t test_pin_bit = false;
+
+ thread_mtx_lock(thread);
+
+ if (thread->active) {
+ thread->active = FALSE;
+
+ act_abort(thread);
+
+ if (thread->started) {
+ clear_wait(thread, THREAD_INTERRUPTED);
+ } else {
+ thread_start(thread);
+ }
+ /* This bit can be reliably tested only if the thread is still active */
+ test_pin_bit = (options == TH_TERMINATE_OPTION_UNPIN) ? true : false;
+ } else {
+ result = KERN_TERMINATED;
}
- act_disable_task_locked(thr_act);
- ret = act_abort(thr_act,FALSE);
+ if (thread->affinity_set != NULL) {
+ thread_affinity_terminate(thread);
+ }
-#if NCPUS > 1
- /*
- * Make sure this thread enters the kernel
+ /*
+ * <rdar://problem/53562036> thread_terminate shouldn't be allowed on pthread
+ * Until thread_terminate is disallowed for pthreads, always unpin the pinned port
+ * when the thread is being terminated.
*/
- if (thread != current_thread()) {
- thread_hold(thr_act);
- act_unlock_thread(thr_act);
+ ipc_thread_port_unpin(thread->ith_self, test_pin_bit);
- if (thread_stop_wait(thread))
- thread_unstop(thread);
- else
- ret = KERN_ABORTED;
+ thread_mtx_unlock(thread);
- (void)act_lock_thread(thr_act);
- thread_release(thr_act);
+ if (thread != current_thread() && result == KERN_SUCCESS) {
+ thread_wait(thread, FALSE);
}
-#endif /* NCPUS > 1 */
- act_unlock_thread(thr_act);
- return(ret);
+ return result;
}
/*
- * Terminate a thread. Called with nothing locked.
- * Returns same way.
+ * Terminate a thread.
*/
kern_return_t
thread_terminate(
- register thread_act_t thr_act)
+ thread_t thread)
{
- task_t task;
- kern_return_t ret;
-
- if (thr_act == THR_ACT_NULL)
+ if (thread == THREAD_NULL) {
return KERN_INVALID_ARGUMENT;
+ }
- task = thr_act->task;
- if (((task == kernel_task) || (thr_act->kernel_loaded == TRUE))
- && (current_act() != thr_act)) {
- return(KERN_FAILURE);
- }
+ /* Kernel threads can't be terminated without their own cooperation */
+ if (thread->task == kernel_task && thread != current_thread()) {
+ return KERN_FAILURE;
+ }
- /*
- * Take the task lock and then call the internal routine
- * that terminates a thread (it needs the task locked).
- */
- task_lock(task);
- ret = thread_terminate_internal(thr_act);
- task_unlock(task);
+ kern_return_t result = thread_terminate_internal(thread, TH_TERMINATE_OPTION_NONE);
/*
- * If a kernel thread is terminating itself, force an AST here.
- * Kernel threads don't normally pass through the AST checking
- * code - and all threads finish their own termination in the
- * special handler APC.
+ * If a kernel thread is terminating itself, force handle the APC_AST here.
+ * Kernel threads don't pass through the return-to-user AST checking code,
+ * but all threads must finish their own termination in thread_apc_ast.
*/
- if (((thr_act->task == kernel_task) || (thr_act->kernel_loaded == TRUE))
- && (current_act() == thr_act)) {
- ast_taken(FALSE, AST_APC, 0);
- panic("thread_terminate(): returning from ast_taken() for %x kernel activation\n", thr_act);
- }
+ if (thread->task == kernel_task) {
+ assert(thread->active == FALSE);
+ thread_ast_clear(thread, AST_APC);
+ thread_apc_ast(thread);
- return ret;
+ panic("thread_terminate");
+ /* NOTREACHED */
+ }
+
+ return result;
+}
+
+kern_return_t
+thread_terminate_pinned(
+ thread_t thread)
+{
+ if (thread == THREAD_NULL) {
+ return KERN_INVALID_ARGUMENT;
+ }
+
+ assert(thread->task != kernel_task);
+
+ kern_return_t result = thread_terminate_internal(thread, TH_TERMINATE_OPTION_UNPIN);
+ return result;
}
/*
- * thread_hold:
+ * Suspend execution of the specified thread.
+ * This is a recursive-style suspension of the thread, a count of
+ * suspends is maintained.
*
- * Suspend execution of the specified thread.
- * This is a recursive-style suspension of the thread, a count of
- * suspends is maintained.
- *
- * Called with thr_act locked "appropriately" for synchrony with
- * RPC (see act_lock_thread()). Returns same way.
+ * Called with thread mutex held.
*/
void
-thread_hold(
- register thread_act_t thr_act)
+thread_hold(thread_t thread)
{
- if (thr_act->suspend_count++ == 0) {
- install_special_handler(thr_act);
- nudge(thr_act);
+ if (thread->suspend_count++ == 0) {
+ thread_set_apc_ast(thread);
+ assert(thread->suspend_parked == FALSE);
}
}
/*
- * Decrement internal suspension count for thr_act, setting thread
+ * Decrement internal suspension count, setting thread
* runnable when count falls to zero.
*
- * Called with thr_act locked "appropriately" for synchrony
- * with RPC (see act_lock_thread()).
+ * Because the wait is abortsafe, we can't be guaranteed that the thread
+ * is currently actually waiting even if suspend_parked is set.
+ *
+ * Called with thread mutex held.
*/
void
-thread_release(
- register thread_act_t thr_act)
+thread_release(thread_t thread)
{
- if( thr_act->suspend_count &&
- (--thr_act->suspend_count == 0) )
- nudge( thr_act );
+ assertf(thread->suspend_count > 0, "thread %p over-resumed", thread);
+
+ /* fail-safe on non-assert builds */
+ if (thread->suspend_count == 0) {
+ return;
+ }
+
+ if (--thread->suspend_count == 0) {
+ if (!thread->started) {
+ thread_start(thread);
+ } else if (thread->suspend_parked) {
+ thread->suspend_parked = FALSE;
+ thread_wakeup_thread(&thread->suspend_count, thread);
+ }
+ }
}
kern_return_t
-thread_suspend(
- register thread_act_t thr_act)
+thread_suspend(thread_t thread)
{
- thread_t thread;
+ kern_return_t result = KERN_SUCCESS;
- if (thr_act == THR_ACT_NULL) {
- return(KERN_INVALID_ARGUMENT);
- }
- thread = act_lock_thread(thr_act);
- if (!thr_act->active) {
- act_unlock_thread(thr_act);
- return(KERN_TERMINATED);
+ if (thread == THREAD_NULL || thread->task == kernel_task) {
+ return KERN_INVALID_ARGUMENT;
}
- if (thr_act->user_stop_count++ == 0 &&
- thr_act->suspend_count++ == 0 ) {
- install_special_handler(thr_act);
- if (thread &&
- thr_act == thread->top_act && thread != current_thread()) {
- nudge(thr_act);
- act_unlock_thread(thr_act);
- (void)thread_wait(thread);
- }
- else {
- /*
- * No need to wait for target thread
- */
- act_unlock_thread(thr_act);
+
+ thread_mtx_lock(thread);
+
+ if (thread->active) {
+ if (thread->user_stop_count++ == 0) {
+ thread_hold(thread);
}
+ } else {
+ result = KERN_TERMINATED;
}
- else {
- /*
- * Thread is already suspended
- */
- act_unlock_thread(thr_act);
+
+ thread_mtx_unlock(thread);
+
+ if (thread != current_thread() && result == KERN_SUCCESS) {
+ thread_wait(thread, FALSE);
}
- return(KERN_SUCCESS);
+
+ return result;
}
kern_return_t
-thread_resume(
- register thread_act_t thr_act)
+thread_resume(thread_t thread)
{
- register kern_return_t ret;
- spl_t s;
- thread_t thread;
-
- if (thr_act == THR_ACT_NULL)
- return(KERN_INVALID_ARGUMENT);
- thread = act_lock_thread(thr_act);
- ret = KERN_SUCCESS;
-
- if (thr_act->active) {
- if (thr_act->user_stop_count > 0) {
- if( --thr_act->user_stop_count == 0 ) {
- --thr_act->suspend_count;
- nudge( thr_act );
- }
- }
- else
- ret = KERN_FAILURE;
+ kern_return_t result = KERN_SUCCESS;
+
+ if (thread == THREAD_NULL || thread->task == kernel_task) {
+ return KERN_INVALID_ARGUMENT;
}
- else
- ret = KERN_TERMINATED;
- act_unlock_thread( thr_act );
- return ret;
-}
-/*
- * This routine walks toward the head of an RPC chain starting at
- * a specified thread activation. An alert bit is set and a special
- * handler is installed for each thread it encounters.
- *
- * The target thread act and thread shuttle are already locked.
- */
-kern_return_t
-post_alert(
- register thread_act_t thr_act,
- unsigned alert_bits )
-{
- thread_act_t next;
- thread_t thread;
+ thread_mtx_lock(thread);
- /*
- * Chase the chain, setting alert bits and installing
- * special handlers for each thread act.
- */
- /*** Not yet SMP safe ***/
- /*** Worse, where's the activation locking as the chain is walked? ***/
- for (next = thr_act; next != THR_ACT_NULL; next = next->higher) {
- next->alerts |= alert_bits;
- install_special_handler_locked(next);
+ if (thread->active) {
+ if (thread->user_stop_count > 0) {
+ if (--thread->user_stop_count == 0) {
+ thread_release(thread);
+ }
+ } else {
+ result = KERN_FAILURE;
+ }
+ } else {
+ result = KERN_TERMINATED;
}
- return(KERN_SUCCESS);
+ thread_mtx_unlock(thread);
+
+ return result;
}
/*
- * thread_depress_abort:
+ * thread_depress_abort_from_user:
*
* Prematurely abort priority depression if there is one.
*/
kern_return_t
-thread_depress_abort(
- register thread_act_t thr_act)
+thread_depress_abort_from_user(thread_t thread)
{
- register thread_t thread;
- kern_return_t result;
- sched_policy_t *policy;
- spl_t s;
-
- if (thr_act == THR_ACT_NULL)
- return (KERN_INVALID_ARGUMENT);
+ kern_return_t result;
- thread = act_lock_thread(thr_act);
- /* if activation is terminating, this operation is not meaningful */
- if (!thr_act->active) {
- act_unlock_thread(thr_act);
-
- return (KERN_TERMINATED);
- }
+ if (thread == THREAD_NULL) {
+ return KERN_INVALID_ARGUMENT;
+ }
- s = splsched();
- thread_lock(thread);
- policy = &sched_policy[thread->policy];
- thread_unlock(thread);
- splx(s);
+ thread_mtx_lock(thread);
- result = policy->sp_ops.sp_thread_depress_abort(policy, thread);
+ if (thread->active) {
+ result = thread_depress_abort(thread);
+ } else {
+ result = KERN_TERMINATED;
+ }
- act_unlock_thread(thr_act);
+ thread_mtx_unlock(thread);
- return (result);
+ return result;
}
/*
- * Already locked: all RPC-related locks for thr_act (see
- * act_lock_thread()).
+ * Indicate that the thread should run the AST_APC callback
+ * to detect an abort condition.
+ *
+ * Called with thread mutex held.
*/
-kern_return_t
-act_abort( thread_act_t thr_act, int chain_break )
+static void
+act_abort(
+ thread_t thread)
{
- spl_t spl;
- thread_t thread;
- struct ipc_port *iplock = thr_act->pool_port;
- thread_act_t orphan;
- kern_return_t kr;
- etap_data_t probe_data;
-
- ETAP_DATA_LOAD(probe_data[0], thr_act);
- ETAP_DATA_LOAD(probe_data[1], thr_act->thread);
- ETAP_PROBE_DATA(ETAP_P_ACT_ABORT,
- 0,
- current_thread(),
- &probe_data,
- ETAP_DATA_ENTRY*2);
-
- /*
- * If the target thread activation is not the head...
- */
- if ( thr_act->thread->top_act != thr_act ) {
- /*
- * mark the activation for abort,
- * update the suspend count,
- * always install the special handler
- */
- install_special_handler(thr_act);
-
-#ifdef AGRESSIVE_ABORT
- /* release state buffer for target's outstanding invocation */
- if (unwind_invoke_state(thr_act) != KERN_SUCCESS) {
- panic("unwind_invoke_state failure");
- }
-
- /* release state buffer for target's incoming invocation */
- if (thr_act->lower != THR_ACT_NULL) {
- if (unwind_invoke_state(thr_act->lower)
- != KERN_SUCCESS) {
- panic("unwind_invoke_state failure");
- }
- }
+ spl_t s = splsched();
- /* unlink target thread activation from shuttle chain */
- if ( thr_act->lower == THR_ACT_NULL ) {
- /*
- * This is the root thread activation of the chain.
- * Unlink the root thread act from the bottom of
- * the chain.
- */
- thr_act->higher->lower = THR_ACT_NULL;
- } else {
- /*
- * This thread act is in the middle of the chain.
- * Unlink the thread act from the middle of the chain.
- */
- thr_act->higher->lower = thr_act->lower;
- thr_act->lower->higher = thr_act->higher;
-
- /* set the terminated bit for RPC return processing */
- thr_act->lower->alerts |= SERVER_TERMINATED;
- }
-
- orphan = thr_act->higher;
-
- /* remove the activation from its thread pool */
- /* (note: this is okay for "rooted threads," too) */
- act_locked_act_set_thread_pool(thr_act, IP_NULL);
-
- /* (just to be thorough) release the IP lock */
- if (iplock != IP_NULL) ip_unlock(iplock);
-
- /* release one more reference for a rooted thread */
- if (iplock == IP_NULL) act_locked_act_deallocate(thr_act);
+ thread_lock(thread);
- /* Presumably, the only reference to this activation is
- * now held by the caller of this routine. */
- assert(thr_act->ref_count == 1);
-#else /*AGRESSIVE_ABORT*/
- /* If there is a lower activation in the RPC chain... */
- if (thr_act->lower != THR_ACT_NULL) {
- /* ...indicate the server activation was terminated */
- thr_act->lower->alerts |= SERVER_TERMINATED;
- }
- /* Mark (and process) any orphaned activations */
- orphan = thr_act->higher;
-#endif /*AGRESSIVE_ABORT*/
-
- /* indicate client of orphaned chain has been terminated */
- orphan->alerts |= CLIENT_TERMINATED;
-
- /*
- * Set up posting of alert to headward portion of
- * the RPC chain.
- */
- /*** fix me -- orphan act is not locked ***/
- post_alert(orphan, ORPHANED);
-
- /*
- * Get attention of head of RPC chain.
- */
- nudge(thr_act->thread->top_act);
- return (KERN_SUCCESS);
+ if (!(thread->sched_flags & TH_SFLAG_ABORT)) {
+ thread->sched_flags |= TH_SFLAG_ABORT;
+ thread_set_apc_ast_locked(thread);
+ thread_depress_abort_locked(thread);
+ } else {
+ thread->sched_flags &= ~TH_SFLAG_ABORTSAFELY;
}
- /*
- * If the target thread is the end of the chain, the thread
- * has to be marked for abort and rip it out of any wait.
- */
- spl = splsched();
- thread_lock(thr_act->thread);
- if (thr_act->thread->top_act == thr_act) {
- thr_act->thread->state |= TH_ABORT;
- clear_wait_internal(thr_act->thread, THREAD_INTERRUPTED);
- thread_unlock(thr_act->thread);
- splx(spl);
- install_special_handler(thr_act);
- nudge( thr_act );
- }
- return KERN_SUCCESS;
+ thread_unlock(thread);
+ splx(s);
}
-
+
kern_return_t
thread_abort(
- register thread_act_t thr_act)
+ thread_t thread)
{
- int ret;
- thread_t thread;
+ kern_return_t result = KERN_SUCCESS;
- if (thr_act == THR_ACT_NULL || thr_act == current_act())
- return (KERN_INVALID_ARGUMENT);
- /*
- * Lock the target thread and the current thread now,
- * in case thread_halt() ends up being called below.
- */
- thread = act_lock_thread(thr_act);
- if (!thr_act->active) {
- act_unlock_thread(thr_act);
- return(KERN_TERMINATED);
+ if (thread == THREAD_NULL) {
+ return KERN_INVALID_ARGUMENT;
+ }
+
+ thread_mtx_lock(thread);
+
+ if (thread->active) {
+ act_abort(thread);
+ clear_wait(thread, THREAD_INTERRUPTED);
+ } else {
+ result = KERN_TERMINATED;
}
- ret = act_abort( thr_act, FALSE );
- act_unlock_thread( thr_act );
- return ret;
+ thread_mtx_unlock(thread);
+
+ return result;
}
kern_return_t
thread_abort_safely(
- register thread_act_t thr_act)
+ thread_t thread)
{
- thread_t thread;
- spl_t s;
+ kern_return_t result = KERN_SUCCESS;
- if (thr_act == THR_ACT_NULL || thr_act == current_act())
- return(KERN_INVALID_ARGUMENT);
-
- thread = act_lock_thread(thr_act);
- if (!thr_act->active) {
- act_unlock_thread(thr_act);
- return(KERN_TERMINATED);
- }
- if (thread->top_act != thr_act) {
- act_unlock_thread(thr_act);
- return(KERN_FAILURE);
+ if (thread == THREAD_NULL) {
+ return KERN_INVALID_ARGUMENT;
}
- s = splsched();
- thread_lock(thread);
- if ( thread->at_safe_point ) {
- /*
- * It's an abortable wait, clear it, then
- * let the thread go and return successfully.
- */
- clear_wait_internal(thread, THREAD_INTERRUPTED);
+ thread_mtx_lock(thread);
+
+ if (thread->active) {
+ spl_t s = splsched();
+
+ thread_lock(thread);
+ if (!thread->at_safe_point ||
+ clear_wait_internal(thread, THREAD_INTERRUPTED) != KERN_SUCCESS) {
+ if (!(thread->sched_flags & TH_SFLAG_ABORT)) {
+ thread->sched_flags |= TH_SFLAG_ABORTED_MASK;
+ thread_set_apc_ast_locked(thread);
+ thread_depress_abort_locked(thread);
+ }
+ }
thread_unlock(thread);
- act_unlock_thread(thr_act);
splx(s);
- return KERN_SUCCESS;
+ } else {
+ result = KERN_TERMINATED;
}
- /*
- * if not stopped at a safepoint, just let it go and return failure.
- */
- thread_unlock(thread);
- act_unlock_thread(thr_act);
- splx(s);
- return KERN_FAILURE;
+ thread_mtx_unlock(thread);
+
+ return result;
}
/*** backward compatibility hacks ***/
#include <mach/thread_info.h>
#include <mach/thread_special_ports.h>
#include <ipc/ipc_port.h>
-#include <mach/thread_act_server.h>
kern_return_t
thread_info(
- thread_act_t thr_act,
- thread_flavor_t flavor,
- thread_info_t thread_info_out,
- mach_msg_type_number_t *thread_info_count)
+ thread_t thread,
+ thread_flavor_t flavor,
+ thread_info_t thread_info_out,
+ mach_msg_type_number_t *thread_info_count)
{
- register thread_t thread;
- kern_return_t result;
+ kern_return_t result;
- if (thr_act == THR_ACT_NULL)
- return (KERN_INVALID_ARGUMENT);
+ if (thread == THREAD_NULL) {
+ return KERN_INVALID_ARGUMENT;
+ }
- thread = act_lock_thread(thr_act);
- if (!thr_act->active) {
- act_unlock_thread(thr_act);
+ thread_mtx_lock(thread);
- return (KERN_TERMINATED);
+ if (thread->active || thread->inspection) {
+ result = thread_info_internal(
+ thread, flavor, thread_info_out, thread_info_count);
+ } else {
+ result = KERN_TERMINATED;
}
- result = thread_info_shuttle(thr_act, flavor,
- thread_info_out, thread_info_count);
-
- act_unlock_thread(thr_act);
+ thread_mtx_unlock(thread);
- return (result);
+ return result;
}
-/*
- * Routine: thread_get_special_port [kernel call]
- * Purpose:
- * Clones a send right for one of the thread's
- * special ports.
- * Conditions:
- * Nothing locked.
- * Returns:
- * KERN_SUCCESS Extracted a send right.
- * KERN_INVALID_ARGUMENT The thread is null.
- * KERN_FAILURE The thread is dead.
- * KERN_INVALID_ARGUMENT Invalid special port.
- */
-
-kern_return_t
-thread_get_special_port(
- thread_act_t thr_act,
- int which,
- ipc_port_t *portp)
+static inline kern_return_t
+thread_get_state_internal(
+ thread_t thread,
+ int flavor,
+ thread_state_t state, /* pointer to OUT array */
+ mach_msg_type_number_t *state_count, /*IN/OUT*/
+ boolean_t to_user)
{
- ipc_port_t *whichp;
- ipc_port_t port;
- thread_t thread;
+ kern_return_t result = KERN_SUCCESS;
-#if MACH_ASSERT
- if (watchacts & WA_PORT)
- printf("thread_get_special_port(thr_act=%x, which=%x port@%x=%x\n",
- thr_act, which, portp, (portp ? *portp : 0));
-#endif /* MACH_ASSERT */
-
- if (!thr_act)
+ if (thread == THREAD_NULL) {
return KERN_INVALID_ARGUMENT;
- thread = act_lock_thread(thr_act);
- switch (which) {
- case THREAD_KERNEL_PORT:
- whichp = &thr_act->ith_sself;
- break;
-
- default:
- act_unlock_thread(thr_act);
- return KERN_INVALID_ARGUMENT;
- }
-
- if (!thr_act->active) {
- act_unlock_thread(thr_act);
- return KERN_FAILURE;
}
- port = ipc_port_copy_send(*whichp);
- act_unlock_thread(thr_act);
-
- *portp = port;
- return KERN_SUCCESS;
-}
-
-/*
- * Routine: thread_set_special_port [kernel call]
- * Purpose:
- * Changes one of the thread's special ports,
- * setting it to the supplied send right.
- * Conditions:
- * Nothing locked. If successful, consumes
- * the supplied send right.
- * Returns:
- * KERN_SUCCESS Changed the special port.
- * KERN_INVALID_ARGUMENT The thread is null.
- * KERN_FAILURE The thread is dead.
- * KERN_INVALID_ARGUMENT Invalid special port.
- */
-
-kern_return_t
-thread_set_special_port(
- thread_act_t thr_act,
- int which,
- ipc_port_t port)
-{
- ipc_port_t *whichp;
- ipc_port_t old;
- thread_t thread;
+ thread_mtx_lock(thread);
-#if MACH_ASSERT
- if (watchacts & WA_PORT)
- printf("thread_set_special_port(thr_act=%x,which=%x,port=%x\n",
- thr_act, which, port);
-#endif /* MACH_ASSERT */
+ if (thread->active) {
+ if (thread != current_thread()) {
+ thread_hold(thread);
- if (thr_act == 0)
- return KERN_INVALID_ARGUMENT;
+ thread_mtx_unlock(thread);
- thread = act_lock_thread(thr_act);
- switch (which) {
- case THREAD_KERNEL_PORT:
- whichp = &thr_act->ith_self;
- break;
+ if (thread_stop(thread, FALSE)) {
+ thread_mtx_lock(thread);
+ result = machine_thread_get_state(
+ thread, flavor, state, state_count);
+ thread_unstop(thread);
+ } else {
+ thread_mtx_lock(thread);
+ result = KERN_ABORTED;
+ }
- default:
- act_unlock_thread(thr_act);
- return KERN_INVALID_ARGUMENT;
+ thread_release(thread);
+ } else {
+ result = machine_thread_get_state(
+ thread, flavor, state, state_count);
+ }
+ } else if (thread->inspection) {
+ result = machine_thread_get_state(
+ thread, flavor, state, state_count);
+ } else {
+ result = KERN_TERMINATED;
}
- if (!thr_act->active) {
- act_unlock_thread(thr_act);
- return KERN_FAILURE;
+ if (to_user && result == KERN_SUCCESS) {
+ result = machine_thread_state_convert_to_user(thread, flavor, state,
+ state_count);
}
- old = *whichp;
- *whichp = port;
- act_unlock_thread(thr_act);
+ thread_mtx_unlock(thread);
- if (IP_VALID(old))
- ipc_port_release_send(old);
- return KERN_SUCCESS;
+ return result;
}
-/*
- * thread state should always be accessible by locking the thread
- * and copying it. The activation messes things up so for right
- * now if it's not the top of the chain, use a special handler to
- * get the information when the shuttle returns to the activation.
- */
+/* No prototype, since thread_act_server.h has the _to_user version if KERNEL_SERVER */
+
kern_return_t
thread_get_state(
- register thread_act_t thr_act,
- int flavor,
- thread_state_t state, /* pointer to OUT array */
- mach_msg_type_number_t *state_count) /*IN/OUT*/
-{
- kern_return_t ret;
- thread_t thread, nthread;
-
-#if 0 /* Grenoble - why?? */
- if (thr_act == THR_ACT_NULL || thr_act == current_act())
-#else
- if (thr_act == THR_ACT_NULL)
-#endif
- return (KERN_INVALID_ARGUMENT);
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t *state_count);
- thread = act_lock_thread(thr_act);
- if (!thr_act->active) {
- act_unlock_thread(thr_act);
- return(KERN_TERMINATED);
- }
+kern_return_t
+thread_get_state(
+ thread_t thread,
+ int flavor,
+ thread_state_t state, /* pointer to OUT array */
+ mach_msg_type_number_t *state_count) /*IN/OUT*/
+{
+ return thread_get_state_internal(thread, flavor, state, state_count, FALSE);
+}
- thread_hold(thr_act);
- while (1) {
- if (!thread || thr_act != thread->top_act)
- break;
- act_unlock_thread(thr_act);
- (void)thread_stop_wait(thread);
- nthread = act_lock_thread(thr_act);
- if (nthread == thread)
- break;
- thread_unstop(thread);
- thread = nthread;
- }
- ret = act_machine_get_state(thr_act, flavor,
- state, state_count);
- if (thread && thr_act == thread->top_act)
- thread_unstop(thread);
- thread_release(thr_act);
- act_unlock_thread(thr_act);
-
- return(ret);
+kern_return_t
+thread_get_state_to_user(
+ thread_t thread,
+ int flavor,
+ thread_state_t state, /* pointer to OUT array */
+ mach_msg_type_number_t *state_count) /*IN/OUT*/
+{
+ return thread_get_state_internal(thread, flavor, state, state_count, TRUE);
}
/*
* Change thread's machine-dependent state. Called with nothing
* locked. Returns same way.
*/
-kern_return_t
-thread_set_state(
- register thread_act_t thr_act,
- int flavor,
- thread_state_t state,
- mach_msg_type_number_t state_count)
+static inline kern_return_t
+thread_set_state_internal(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t state_count,
+ boolean_t from_user)
{
- kern_return_t ret;
- thread_t thread, nthread;
-
-#if 0 /* Grenoble - why?? */
- if (thr_act == THR_ACT_NULL || thr_act == current_act())
-#else
- if (thr_act == THR_ACT_NULL)
-#endif
- return (KERN_INVALID_ARGUMENT);
- /*
- * We have no kernel activations, so Utah's MO fails for signals etc.
- *
- * If we're blocked in the kernel, use non-blocking method, else
- * pass locked thr_act+thread in to "normal" act_[gs]et_state().
- */
-
- thread = act_lock_thread(thr_act);
- if (!thr_act->active) {
- act_unlock_thread(thr_act);
- return(KERN_TERMINATED);
- }
+ kern_return_t result = KERN_SUCCESS;
- thread_hold(thr_act);
- while (1) {
- if (!thread || thr_act != thread->top_act)
- break;
- act_unlock_thread(thr_act);
- (void)thread_stop_wait(thread);
- nthread = act_lock_thread(thr_act);
- if (nthread == thread)
- break;
- thread_unstop(thread);
- thread = nthread;
+ if (thread == THREAD_NULL) {
+ return KERN_INVALID_ARGUMENT;
}
- ret = act_machine_set_state(thr_act, flavor,
- state, state_count);
- if (thread && thr_act == thread->top_act)
- thread_unstop(thread);
- thread_release(thr_act);
- act_unlock_thread(thr_act);
-
- return(ret);
-}
-
-/*
- * Kernel-internal "thread" interfaces used outside this file:
- */
-kern_return_t
-thread_dup(
- thread_act_t source_thr_act,
- thread_act_t target_thr_act)
-{
- kern_return_t ret;
- thread_t thread, nthread;
+ thread_mtx_lock(thread);
- if (target_thr_act == THR_ACT_NULL || target_thr_act == current_act())
- return (KERN_INVALID_ARGUMENT);
+ if (thread->active) {
+ if (from_user) {
+ result = machine_thread_state_convert_from_user(thread, flavor,
+ state, state_count);
+ if (result != KERN_SUCCESS) {
+ goto out;
+ }
+ }
+ if (thread != current_thread()) {
+ thread_hold(thread);
+
+ thread_mtx_unlock(thread);
+
+ if (thread_stop(thread, TRUE)) {
+ thread_mtx_lock(thread);
+ result = machine_thread_set_state(
+ thread, flavor, state, state_count);
+ thread_unstop(thread);
+ } else {
+ thread_mtx_lock(thread);
+ result = KERN_ABORTED;
+ }
- thread = act_lock_thread(target_thr_act);
- if (!target_thr_act->active) {
- act_unlock_thread(target_thr_act);
- return(KERN_TERMINATED);
+ thread_release(thread);
+ } else {
+ result = machine_thread_set_state(
+ thread, flavor, state, state_count);
+ }
+ } else {
+ result = KERN_TERMINATED;
}
- thread_hold(target_thr_act);
- while (1) {
- if (!thread || target_thr_act != thread->top_act)
- break;
- act_unlock_thread(target_thr_act);
- (void)thread_stop_wait(thread);
- nthread = act_lock_thread(target_thr_act);
- if (nthread == thread)
- break;
- thread_unstop(thread);
- thread = nthread;
+ if ((result == KERN_SUCCESS) && from_user) {
+ extmod_statistics_incr_thread_set_state(thread);
}
- ret = act_thread_dup(source_thr_act, target_thr_act);
- if (thread && target_thr_act == thread->top_act)
- thread_unstop(thread);
- thread_release(target_thr_act);
- act_unlock_thread(target_thr_act);
- return(ret);
+out:
+ thread_mtx_unlock(thread);
+
+ return result;
}
+/* No prototype, since thread_act_server.h has the _from_user version if KERNEL_SERVER */
+kern_return_t
+thread_set_state(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t state_count);
-/*
- * thread_setstatus:
- *
- * Set the status of the specified thread.
- * Called with (and returns with) no locks held.
- */
kern_return_t
-thread_setstatus(
- thread_act_t thr_act,
- int flavor,
- thread_state_t tstate,
- mach_msg_type_number_t count)
+thread_set_state(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t state_count)
{
- kern_return_t kr;
- thread_t thread;
-
- thread = act_lock_thread(thr_act);
- assert(thread);
- assert(thread->top_act == thr_act);
- kr = act_machine_set_state(thr_act, flavor, tstate, count);
- act_unlock_thread(thr_act);
- return(kr);
+ return thread_set_state_internal(thread, flavor, state, state_count, FALSE);
}
-/*
- * thread_getstatus:
- *
- * Get the status of the specified thread.
- */
kern_return_t
-thread_getstatus(
- thread_act_t thr_act,
- int flavor,
- thread_state_t tstate,
- mach_msg_type_number_t *count)
+thread_set_state_from_user(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t state_count)
{
- kern_return_t kr;
- thread_t thread;
-
- thread = act_lock_thread(thr_act);
- assert(thread);
- assert(thread->top_act == thr_act);
- kr = act_machine_get_state(thr_act, flavor, tstate, count);
- act_unlock_thread(thr_act);
- return(kr);
+ return thread_set_state_internal(thread, flavor, state, state_count, TRUE);
}
-/*
- * Kernel-internal thread_activation interfaces used outside this file:
- */
-
-/*
- * act_init() - Initialize activation handling code
- */
-void
-act_init()
+kern_return_t
+thread_convert_thread_state(
+ thread_t thread,
+ int direction,
+ thread_state_flavor_t flavor,
+ thread_state_t in_state, /* pointer to IN array */
+ mach_msg_type_number_t in_state_count,
+ thread_state_t out_state, /* pointer to OUT array */
+ mach_msg_type_number_t *out_state_count) /*IN/OUT*/
{
- thr_act_zone = zinit(
- sizeof(struct thread_activation),
- ACT_MAX * sizeof(struct thread_activation), /* XXX */
- ACT_CHUNK * sizeof(struct thread_activation),
- "activations");
- act_machine_init();
-}
+ kern_return_t kr;
+ thread_t to_thread = THREAD_NULL;
+ thread_t from_thread = THREAD_NULL;
+ mach_msg_type_number_t state_count = in_state_count;
+ if (direction != THREAD_CONVERT_THREAD_STATE_TO_SELF &&
+ direction != THREAD_CONVERT_THREAD_STATE_FROM_SELF) {
+ return KERN_INVALID_ARGUMENT;
+ }
-/*
- * act_create - Create a new activation in a specific task.
- */
-kern_return_t
-act_create(task_t task,
- thread_act_t *new_act)
-{
- thread_act_t thr_act;
- int rc;
- vm_map_t map;
-
- thr_act = (thread_act_t)zalloc(thr_act_zone);
- if (thr_act == 0)
- return(KERN_RESOURCE_SHORTAGE);
-
-#if MACH_ASSERT
- if (watchacts & WA_ACT_LNK)
- printf("act_create(task=%x,thr_act@%x=%x)\n",
- task, new_act, thr_act);
-#endif /* MACH_ASSERT */
-
- /* Start by zeroing everything; then init non-zero items only */
- bzero((char *)thr_act, sizeof(*thr_act));
-
-#ifdef MACH_BSD
- {
- /*
- * Take care of the uthread allocation
- * do it early in order to make KERN_RESOURCE_SHORTAGE
- * handling trivial
- * uthread_alloc() will bzero the storage allocated.
- */
- extern void *uthread_alloc(void);
- thr_act->uthread = uthread_alloc();
- if(thr_act->uthread == 0) {
- /* Put the thr_act back on the thr_act zone */
- zfree(thr_act_zone, (vm_offset_t)thr_act);
- return(KERN_RESOURCE_SHORTAGE);
- }
+ if (thread == THREAD_NULL) {
+ return KERN_INVALID_ARGUMENT;
}
-#endif /* MACH_BSD */
- /*
- * Start with one reference for the caller and one for the
- * act being alive.
- */
- act_lock_init(thr_act);
- thr_act->ref_count = 2;
-
- /* Latch onto the task. */
- thr_act->task = task;
- task_reference(task);
-
- /* Initialize sigbufp for High-Watermark buffer allocation */
- thr_act->r_sigbufp = (routine_descriptor_t) &thr_act->r_sigbuf;
- thr_act->r_sigbuf_size = sizeof(thr_act->r_sigbuf);
-
-#if THREAD_SWAPPER
- thr_act->swap_state = TH_SW_IN;
-#if MACH_ASSERT
- thr_act->kernel_stack_swapped_in = TRUE;
-#endif /* MACH_ASSERT */
-#endif /* THREAD_SWAPPER */
-
- /* special_handler will always be last on the returnhandlers list. */
- thr_act->special_handler.next = 0;
- thr_act->special_handler.handler = special_handler;
-
-#if MACH_PROF
- thr_act->act_profiled = FALSE;
- thr_act->act_profiled_own = FALSE;
- thr_act->profil_buffer = NULLPROFDATA;
-#endif
+ if (state_count > *out_state_count) {
+ return KERN_INSUFFICIENT_BUFFER_SIZE;
+ }
- /* Initialize the held_ulocks queue as empty */
- queue_init(&thr_act->held_ulocks);
+ if (direction == THREAD_CONVERT_THREAD_STATE_FROM_SELF) {
+ to_thread = thread;
+ from_thread = current_thread();
+ } else {
+ to_thread = current_thread();
+ from_thread = thread;
+ }
- /* Inherit the profiling status of the parent task */
- act_prof_init(thr_act, task);
+ /* Authenticate and convert thread state to kernel representation */
+ kr = machine_thread_state_convert_from_user(from_thread, flavor,
+ in_state, state_count);
- ipc_thr_act_init(task, thr_act);
- act_machine_create(task, thr_act);
+ /* Return early if one of the thread was jop disabled while other wasn't */
+ if (kr != KERN_SUCCESS) {
+ return kr;
+ }
- /*
- * If thr_act created in kernel-loaded task, alter its saved
- * state to so indicate
- */
- if (task->kernel_loaded) {
- act_user_to_kernel(thr_act);
+ /* Convert thread state to target thread user representation */
+ kr = machine_thread_state_convert_to_user(to_thread, flavor,
+ in_state, &state_count);
+
+ if (kr == KERN_SUCCESS) {
+ if (state_count <= *out_state_count) {
+ memcpy(out_state, in_state, state_count * sizeof(uint32_t));
+ *out_state_count = state_count;
+ } else {
+ kr = KERN_INSUFFICIENT_BUFFER_SIZE;
+ }
}
- /* Cache the task's map and take a reference to it */
- map = task->map;
- thr_act->map = map;
-
- /* Inline vm_map_reference cause we don't want to increment res_count */
- mutex_lock(&map->s_lock);
-#if TASK_SWAPPER
- assert(map->res_count > 0);
- assert(map->ref_count >= map->res_count);
-#endif /* TASK_SWAPPER */
- map->ref_count++;
- mutex_unlock(&map->s_lock);
-
- *new_act = thr_act;
- return KERN_SUCCESS;
+ return kr;
}
/*
- * act_free - called when an thr_act's ref_count drops to zero.
- *
- * This can only happen after the activation has been reaped, and
- * all other references to it have gone away. We can now release
- * the last critical resources, unlink the activation from the
- * task, and release the reference on the thread shuttle itself.
- *
- * Called with activation locked.
+ * Kernel-internal "thread" interfaces used outside this file:
*/
-#if MACH_ASSERT
-int dangerous_bzero = 1; /* paranoia & safety */
-#endif
-void
-act_free(thread_act_t thr_act)
+/* Initialize (or re-initialize) a thread state. Called from execve
+ * with nothing locked, returns same way.
+ */
+kern_return_t
+thread_state_initialize(
+ thread_t thread)
{
- task_t task;
- thread_t thr;
- vm_map_t map;
- unsigned int ref;
-
-#if MACH_ASSERT
- if (watchacts & WA_EXIT)
- printf("act_free(%x(%d)) thr=%x tsk=%x(%d) pport=%x%sactive\n",
- thr_act, thr_act->ref_count, thr_act->thread,
- thr_act->task,
- thr_act->task ? thr_act->task->ref_count : 0,
- thr_act->pool_port,
- thr_act->active ? " " : " !");
-#endif /* MACH_ASSERT */
-
-
-#if THREAD_SWAPPER
- assert(thr_act->kernel_stack_swapped_in);
-#endif /* THREAD_SWAPPER */
-
- assert(!thr_act->active);
- assert(!thr_act->pool_port);
-
- task = thr_act->task;
- task_lock(task);
-
- if (thr = thr_act->thread) {
- time_value_t user_time, system_time;
-
- thread_read_times(thr, &user_time, &system_time);
- time_value_add(&task->total_user_time, &user_time);
- time_value_add(&task->total_system_time, &system_time);
-
- /* Unlink the thr_act from the task's thr_act list,
- * so it doesn't appear in calls to task_threads and such.
- * The thr_act still keeps its ref on the task, however.
- */
- queue_remove(&task->thr_acts, thr_act, thread_act_t, thr_acts);
- thr_act->thr_acts.next = NULL;
- task->thr_act_count--;
-
-#if THREAD_SWAPPER
- /*
- * Thread is supposed to be unswappable by now...
- */
- assert(thr_act->swap_state == TH_SW_UNSWAPPABLE ||
- !thread_swap_unwire_stack);
-#endif /* THREAD_SWAPPER */
-
- task->res_act_count--;
- task_unlock(task);
- task_deallocate(task);
- thread_deallocate(thr);
- act_machine_destroy(thr_act);
- } else {
- /*
- * Must have never really gotten started
- * no unlinking from the task and no need
- * to free the shuttle.
- */
- task_unlock(task);
- task_deallocate(task);
+ kern_return_t result = KERN_SUCCESS;
+
+ if (thread == THREAD_NULL) {
+ return KERN_INVALID_ARGUMENT;
}
- sigbuf_dealloc(thr_act);
- act_prof_deallocate(thr_act);
- ipc_thr_act_terminate(thr_act);
+ thread_mtx_lock(thread);
- /*
- * Drop the cached map reference.
- * Inline version of vm_map_deallocate() because we
- * don't want to decrement the map's residence count here.
- */
- map = thr_act->map;
- mutex_lock(&map->s_lock);
-#if TASK_SWAPPER
- assert(map->res_count >= 0);
- assert(map->ref_count > map->res_count);
-#endif /* TASK_SWAPPER */
- ref = --map->ref_count;
- mutex_unlock(&map->s_lock);
- if (ref == 0)
- vm_map_destroy(map);
-
-#ifdef MACH_BSD
- {
- /*
- * Free uthread BEFORE the bzero.
- * Not doing so will result in a leak.
- */
- extern void uthread_free(void *);
- void *ut = thr_act->uthread;
- thr_act->uthread = 0;
- uthread_free(ut);
+ if (thread->active) {
+ if (thread != current_thread()) {
+ thread_hold(thread);
+
+ thread_mtx_unlock(thread);
+
+ if (thread_stop(thread, TRUE)) {
+ thread_mtx_lock(thread);
+ result = machine_thread_state_initialize( thread );
+ thread_unstop(thread);
+ } else {
+ thread_mtx_lock(thread);
+ result = KERN_ABORTED;
+ }
+
+ thread_release(thread);
+ } else {
+ result = machine_thread_state_initialize( thread );
+ }
+ } else {
+ result = KERN_TERMINATED;
}
-#endif /* MACH_BSD */
-
-#if MACH_ASSERT
- if (dangerous_bzero) /* dangerous if we're still using it! */
- bzero((char *)thr_act, sizeof(*thr_act));
-#endif /* MACH_ASSERT */
- /* Put the thr_act back on the thr_act zone */
- zfree(thr_act_zone, (vm_offset_t)thr_act);
-}
+ thread_mtx_unlock(thread);
-/*
- * act_attach - Attach an thr_act to the top of a thread ("push the stack").
- *
- * The thread_shuttle must be either the current one or a brand-new one.
- * Assumes the thr_act is active but not in use, also, that if it is
- * attached to an thread_pool (i.e. the thread_pool pointer is nonzero),
- * the thr_act has already been taken off the thread_pool's list.
- *
- * Already locked: thr_act plus "appropriate" thread-related locks
- * (see act_lock_thread()).
- */
-void
-act_attach(
- thread_act_t thr_act,
- thread_t thread,
- unsigned init_alert_mask)
-{
- thread_act_t lower;
-
-#if MACH_ASSERT
- assert(thread == current_thread() || thread->top_act == THR_ACT_NULL);
- if (watchacts & WA_ACT_LNK)
- printf("act_attach(thr_act %x(%d) thread %x(%d) mask %d)\n",
- thr_act, thr_act->ref_count, thread, thread->ref_count,
- init_alert_mask);
-#endif /* MACH_ASSERT */
-
- /*
- * Chain the thr_act onto the thread's thr_act stack.
- * Set mask and auto-propagate alerts from below.
- */
- thr_act->ref_count++;
- thr_act->thread = thread;
- thr_act->higher = THR_ACT_NULL; /*safety*/
- thr_act->alerts = 0;
- thr_act->alert_mask = init_alert_mask;
- lower = thr_act->lower = thread->top_act;
-
- if (lower != THR_ACT_NULL) {
- lower->higher = thr_act;
- thr_act->alerts = (lower->alerts & init_alert_mask);
- }
-
- thread->top_act = thr_act;
+ return result;
}
-/*
- * act_detach
- *
- * Remove the current thr_act from the top of the current thread, i.e.
- * "pop the stack". Assumes already locked: thr_act plus "appropriate"
- * thread-related locks (see act_lock_thread).
- */
-void
-act_detach(
- thread_act_t cur_act)
+kern_return_t
+thread_dup(
+ thread_t target)
{
- thread_t cur_thread = cur_act->thread;
-
-#if MACH_ASSERT
- if (watchacts & (WA_EXIT|WA_ACT_LNK))
- printf("act_detach: thr_act %x(%d), thrd %x(%d) task=%x(%d)\n",
- cur_act, cur_act->ref_count,
- cur_thread, cur_thread->ref_count,
- cur_act->task,
- cur_act->task ? cur_act->task->ref_count : 0);
-#endif /* MACH_ASSERT */
-
- /* Unlink the thr_act from the thread's thr_act stack */
- cur_thread->top_act = cur_act->lower;
- cur_act->thread = 0;
- cur_act->ref_count--;
- assert(cur_act->ref_count > 0);
-
- thread_pool_put_act(cur_act);
-
-#if MACH_ASSERT
- cur_act->lower = cur_act->higher = THR_ACT_NULL;
- if (cur_thread->top_act)
- cur_thread->top_act->higher = THR_ACT_NULL;
-#endif /* MACH_ASSERT */
-
- return;
-}
+ thread_t self = current_thread();
+ kern_return_t result = KERN_SUCCESS;
+ if (target == THREAD_NULL || target == self) {
+ return KERN_INVALID_ARGUMENT;
+ }
-/*
- * Synchronize a thread operation with RPC. Called with nothing
- * locked. Returns with thr_act locked, plus one of four
- * combinations of other locks held:
- * none - for new activation not yet associated with thread_pool
- * or shuttle
- * rpc_lock(thr_act->thread) only - for base activation (one
- * without pool_port)
- * ip_lock(thr_act->pool_port) only - for empty activation (one
- * with no associated shuttle)
- * both locks - for "active" activation (has shuttle, lives
- * on thread_pool)
- * If thr_act has an associated shuttle, this function returns
- * its address. Otherwise it returns zero.
- */
-thread_t
-act_lock_thread(
- thread_act_t thr_act)
-{
- ipc_port_t pport;
+ thread_mtx_lock(target);
- /*
- * Allow the shuttle cloning code (q.v., when it
- * exists :-}) to obtain ip_lock()'s while holding
- * an rpc_lock().
- */
- while (1) {
- act_lock(thr_act);
- pport = thr_act->pool_port;
- if (!pport || ip_lock_try(pport)) {
- if (!thr_act->thread)
- break;
- if (rpc_lock_try(thr_act->thread))
- break;
- if (pport)
- ip_unlock(pport);
- }
- act_unlock(thr_act);
- mutex_pause();
- }
- return (thr_act->thread);
-}
+ if (target->active) {
+ thread_hold(target);
-/*
- * Unsynchronize with RPC (i.e., undo an act_lock_thread() call).
- * Called with thr_act locked, plus thread locks held that are
- * "correct" for thr_act's state. Returns with nothing locked.
- */
-void
-act_unlock_thread(thread_act_t thr_act)
-{
- if (thr_act->thread)
- rpc_unlock(thr_act->thread);
- if (thr_act->pool_port)
- ip_unlock(thr_act->pool_port);
- act_unlock(thr_act);
-}
+ thread_mtx_unlock(target);
-/*
- * Synchronize with RPC given a pointer to a shuttle (instead of an
- * activation). Called with nothing locked; returns with all
- * "appropriate" thread-related locks held (see act_lock_thread()).
- */
-thread_act_t
-thread_lock_act(
- thread_t thread)
-{
- thread_act_t thr_act;
-
- while (1) {
- rpc_lock(thread);
- thr_act = thread->top_act;
- if (!thr_act)
- break;
- if (!act_lock_try(thr_act)) {
- rpc_unlock(thread);
- mutex_pause();
- continue;
- }
- if (thr_act->pool_port &&
- !ip_lock_try(thr_act->pool_port)) {
- rpc_unlock(thread);
- act_unlock(thr_act);
- mutex_pause();
- continue;
+ if (thread_stop(target, TRUE)) {
+ thread_mtx_lock(target);
+ result = machine_thread_dup(self, target, FALSE);
+
+ if (self->affinity_set != AFFINITY_SET_NULL) {
+ thread_affinity_dup(self, target);
+ }
+ thread_unstop(target);
+ } else {
+ thread_mtx_lock(target);
+ result = KERN_ABORTED;
}
- break;
+
+ thread_release(target);
+ } else {
+ result = KERN_TERMINATED;
}
- return (thr_act);
-}
-/*
- * Unsynchronize with RPC starting from a pointer to a shuttle.
- * Called with RPC-related locks held that are appropriate to
- * shuttle's state; any activation is also locked.
- */
-void
-thread_unlock_act(
- thread_t thread)
-{
- thread_act_t thr_act;
+ thread_mtx_unlock(target);
- if (thr_act = thread->top_act) {
- if (thr_act->pool_port)
- ip_unlock(thr_act->pool_port);
- act_unlock(thr_act);
- }
- rpc_unlock(thread);
+ return result;
}
-/*
- * switch_act
- *
- * If a new activation is given, switch to it. If not,
- * switch to the lower activation (pop). Returns the old
- * activation. This is for RPC support.
- */
-thread_act_t
-switch_act(
- thread_act_t act)
-{
- thread_t thread;
- thread_act_t old, new;
- unsigned cpu;
- spl_t spl;
+kern_return_t
+thread_dup2(
+ thread_t source,
+ thread_t target)
+{
+ kern_return_t result = KERN_SUCCESS;
+ uint32_t active = 0;
- disable_preemption();
-
- cpu = cpu_number();
- thread = current_thread();
+ if (source == THREAD_NULL || target == THREAD_NULL || target == source) {
+ return KERN_INVALID_ARGUMENT;
+ }
- /*
- * Find the old and new activation for switch.
- */
- old = thread->top_act;
+ thread_mtx_lock(source);
+ active = source->active;
+ thread_mtx_unlock(source);
- if (act) {
- new = act;
- new->thread = thread;
- }
- else {
- new = old->lower;
+ if (!active) {
+ return KERN_TERMINATED;
}
- assert(new != THR_ACT_NULL);
-#if THREAD_SWAPPER
- assert(new->swap_state != TH_SW_OUT &&
- new->swap_state != TH_SW_COMING_IN);
-#endif /* THREAD_SWAPPER */
+ thread_mtx_lock(target);
- assert(cpu_data[cpu].active_thread == thread);
- active_kloaded[cpu] = (new->kernel_loaded) ? new : 0;
+ if (target->active || target->inspection) {
+ thread_hold(target);
- /* This is where all the work happens */
- machine_switch_act(thread, old, new, cpu);
+ thread_mtx_unlock(target);
- /*
- * Push or pop an activation on the chain.
- */
- if (act) {
- act_attach(new, thread, 0);
- }
- else {
- act_detach(old);
+ if (thread_stop(target, TRUE)) {
+ thread_mtx_lock(target);
+ result = machine_thread_dup(source, target, TRUE);
+ if (source->affinity_set != AFFINITY_SET_NULL) {
+ thread_affinity_dup(source, target);
+ }
+ thread_unstop(target);
+ } else {
+ thread_mtx_lock(target);
+ result = KERN_ABORTED;
+ }
+
+ thread_release(target);
+ } else {
+ result = KERN_TERMINATED;
}
- enable_preemption();
+ thread_mtx_unlock(target);
- return(old);
+ return result;
}
/*
- * install_special_handler
- * Install the special returnhandler that handles suspension and
- * termination, if it hasn't been installed already.
+ * thread_setstatus:
*
- * Already locked: RPC-related locks for thr_act, but not
- * scheduling lock (thread_lock()) of the associated thread.
+ * Set the status of the specified thread.
+ * Called with (and returns with) no locks held.
*/
-void
-install_special_handler(
- thread_act_t thr_act)
+kern_return_t
+thread_setstatus(
+ thread_t thread,
+ int flavor,
+ thread_state_t tstate,
+ mach_msg_type_number_t count)
{
- spl_t spl;
- thread_t thread = thr_act->thread;
-
-#if MACH_ASSERT
- if (watchacts & WA_ACT_HDLR)
- printf("act_%x: install_special_hdlr(%x)\n",current_act(),thr_act);
-#endif /* MACH_ASSERT */
-
- spl = splsched();
- thread_lock(thread);
- install_special_handler_locked(thr_act);
- thread_unlock(thread);
- splx(spl);
+ return thread_set_state(thread, flavor, tstate, count);
}
-/*
- * install_special_handler_locked
- * Do the work of installing the special_handler.
- *
- * Already locked: RPC-related locks for thr_act, plus the
- * scheduling lock (thread_lock()) of the associated thread.
- */
-void
-install_special_handler_locked(
- thread_act_t thr_act)
+kern_return_t
+thread_setstatus_from_user(
+ thread_t thread,
+ int flavor,
+ thread_state_t tstate,
+ mach_msg_type_number_t count)
{
- ReturnHandler **rh;
- thread_t thread = thr_act->thread;
-
- /* The work handler must always be the last ReturnHandler on the list,
- because it can do tricky things like detach the thr_act. */
- for (rh = &thr_act->handlers; *rh; rh = &(*rh)->next)
- /* */ ;
- if (rh != &thr_act->special_handler.next) {
- *rh = &thr_act->special_handler;
- }
- if (thread && thr_act == thread->top_act) {
- /*
- * Temporarily undepress, so target has
- * a chance to do locking required to
- * block itself in special_handler().
- */
- if (thread->depress_priority >= 0) {
- thread->priority = thread->depress_priority;
-
- /*
- * Use special value -2 to indicate need
- * to redepress priority in special_handler
- * as thread blocks
- */
- thread->depress_priority = -2;
- compute_priority(thread, FALSE);
- }
- }
- act_set_apc(thr_act);
+ return thread_set_state_from_user(thread, flavor, tstate, count);
}
/*
- * JMM -
- * These two routines will be enhanced over time to call the general handler registration
- * mechanism used by special handlers and alerts. They are hack in for now to avoid
- * having to export the gory details of ASTs to the BSD code right now.
+ * thread_getstatus:
+ *
+ * Get the status of the specified thread.
*/
-extern thread_apc_handler_t bsd_ast;
-
kern_return_t
-thread_apc_set(
- thread_act_t thr_act,
- thread_apc_handler_t apc)
+thread_getstatus(
+ thread_t thread,
+ int flavor,
+ thread_state_t tstate,
+ mach_msg_type_number_t *count)
{
- assert(apc == bsd_ast);
- thread_ast_set(thr_act, AST_BSD);
- if (thr_act == current_act())
- ast_propagate(thr_act->ast);
- return KERN_SUCCESS;
+ return thread_get_state(thread, flavor, tstate, count);
}
kern_return_t
-thread_apc_clear(
- thread_act_t thr_act,
- thread_apc_handler_t apc)
+thread_getstatus_to_user(
+ thread_t thread,
+ int flavor,
+ thread_state_t tstate,
+ mach_msg_type_number_t *count)
{
- assert(apc == bsd_ast);
- thread_ast_clear(thr_act, AST_BSD);
- if (thr_act == current_act())
- ast_off(AST_BSD);
- return KERN_SUCCESS;
+ return thread_get_state_to_user(thread, flavor, tstate, count);
}
/*
- * act_set_thread_pool - Assign an activation to a specific thread_pool.
- * Fails if the activation is already assigned to another pool.
- * If thread_pool == 0, we remove the thr_act from its thread_pool.
- *
- * Called the port containing thread_pool already locked.
- * Returns the same way.
+ * Change thread's machine-dependent userspace TSD base.
+ * Called with nothing locked. Returns same way.
*/
-kern_return_t act_set_thread_pool(
- thread_act_t thr_act,
- ipc_port_t pool_port)
+kern_return_t
+thread_set_tsd_base(
+ thread_t thread,
+ mach_vm_offset_t tsd_base)
{
- thread_pool_t thread_pool;
-
-#if MACH_ASSERT
- if (watchacts & WA_ACT_LNK)
- printf("act_set_thread_pool: %x(%d) -> %x\n",
- thr_act, thr_act->ref_count, thread_pool);
-#endif /* MACH_ASSERT */
-
- if (pool_port == 0) {
- thread_act_t *lact;
-
- if (thr_act->pool_port == 0)
- return KERN_SUCCESS;
- thread_pool = &thr_act->pool_port->ip_thread_pool;
-
- for (lact = &thread_pool->thr_acts; *lact;
- lact = &((*lact)->thread_pool_next)) {
- if (thr_act == *lact) {
- *lact = thr_act->thread_pool_next;
- break;
- }
- }
- act_lock(thr_act);
- thr_act->pool_port = 0;
- thr_act->thread_pool_next = 0;
- act_unlock(thr_act);
- act_deallocate(thr_act);
- return KERN_SUCCESS;
+ kern_return_t result = KERN_SUCCESS;
+
+ if (thread == THREAD_NULL) {
+ return KERN_INVALID_ARGUMENT;
}
- if (thr_act->pool_port != pool_port) {
- thread_pool = &pool_port->ip_thread_pool;
- if (thr_act->pool_port != 0) {
-#if MACH_ASSERT
- if (watchacts & WA_ACT_LNK)
- printf("act_set_thread_pool found %x!\n",
- thr_act->pool_port);
-#endif /* MACH_ASSERT */
- return(KERN_FAILURE);
- }
- act_lock(thr_act);
- thr_act->pool_port = pool_port;
-
- /* The pool gets a ref to the activation -- have
- * to inline operation because thr_act is already
- * locked.
- */
- act_locked_act_reference(thr_act);
-
- /* If it is available,
- * add it to the thread_pool's available-activation list.
- */
- if ((thr_act->thread == 0) && (thr_act->suspend_count == 0)) {
- thr_act->thread_pool_next = thread_pool->thr_acts;
- pool_port->ip_thread_pool.thr_acts = thr_act;
- if (thread_pool->waiting)
- thread_pool_wakeup(thread_pool);
+
+ thread_mtx_lock(thread);
+
+ if (thread->active) {
+ if (thread != current_thread()) {
+ thread_hold(thread);
+
+ thread_mtx_unlock(thread);
+
+ if (thread_stop(thread, TRUE)) {
+ thread_mtx_lock(thread);
+ result = machine_thread_set_tsd_base(thread, tsd_base);
+ thread_unstop(thread);
+ } else {
+ thread_mtx_lock(thread);
+ result = KERN_ABORTED;
+ }
+
+ thread_release(thread);
+ } else {
+ result = machine_thread_set_tsd_base(thread, tsd_base);
}
- act_unlock(thr_act);
+ } else {
+ result = KERN_TERMINATED;
}
- return KERN_SUCCESS;
+ thread_mtx_unlock(thread);
+
+ return result;
}
/*
- * act_locked_act_set_thread_pool- Assign activation to a specific thread_pool.
- * Fails if the activation is already assigned to another pool.
- * If thread_pool == 0, we remove the thr_act from its thread_pool.
+ * thread_set_apc_ast:
*
- * Called the port containing thread_pool already locked.
- * Also called with the thread activation locked.
- * Returns the same way.
+ * Register the AST_APC callback that handles suspension and
+ * termination, if it hasn't been installed already.
*
- * This routine is the same as `act_set_thread_pool()' except that it does
- * not call `act_deallocate(),' which unconditionally tries to obtain the
- * thread activation lock.
+ * Called with the thread mutex held.
*/
-kern_return_t act_locked_act_set_thread_pool(
- thread_act_t thr_act,
- ipc_port_t pool_port)
+static void
+thread_set_apc_ast(thread_t thread)
{
- thread_pool_t thread_pool;
-
-#if MACH_ASSERT
- if (watchacts & WA_ACT_LNK)
- printf("act_set_thread_pool: %x(%d) -> %x\n",
- thr_act, thr_act->ref_count, thread_pool);
-#endif /* MACH_ASSERT */
-
- if (pool_port == 0) {
- thread_act_t *lact;
-
- if (thr_act->pool_port == 0)
- return KERN_SUCCESS;
- thread_pool = &thr_act->pool_port->ip_thread_pool;
-
- for (lact = &thread_pool->thr_acts; *lact;
- lact = &((*lact)->thread_pool_next)) {
- if (thr_act == *lact) {
- *lact = thr_act->thread_pool_next;
- break;
- }
- }
+ spl_t s = splsched();
- thr_act->pool_port = 0;
- thr_act->thread_pool_next = 0;
- act_locked_act_deallocate(thr_act);
- return KERN_SUCCESS;
- }
- if (thr_act->pool_port != pool_port) {
- thread_pool = &pool_port->ip_thread_pool;
- if (thr_act->pool_port != 0) {
-#if MACH_ASSERT
- if (watchacts & WA_ACT_LNK)
- printf("act_set_thread_pool found %x!\n",
- thr_act->pool_port);
-#endif /* MACH_ASSERT */
- return(KERN_FAILURE);
- }
- thr_act->pool_port = pool_port;
-
- /* The pool gets a ref to the activation -- have
- * to inline operation because thr_act is already
- * locked.
- */
- act_locked_act_reference(thr_act);
-
- /* If it is available,
- * add it to the thread_pool's available-activation list.
- */
- if ((thr_act->thread == 0) && (thr_act->suspend_count == 0)) {
- thr_act->thread_pool_next = thread_pool->thr_acts;
- pool_port->ip_thread_pool.thr_acts = thr_act;
- if (thread_pool->waiting)
- thread_pool_wakeup(thread_pool);
- }
- }
+ thread_lock(thread);
+ thread_set_apc_ast_locked(thread);
+ thread_unlock(thread);
- return KERN_SUCCESS;
+ splx(s);
}
/*
- * Activation control support routines internal to this file:
- */
-
-/*
- * act_execute_returnhandlers() - does just what the name says
+ * thread_set_apc_ast_locked:
*
- * This is called by system-dependent code when it detects that
- * thr_act->handlers is non-null while returning into user mode.
- * Activations linked onto an thread_pool always have null thr_act->handlers,
- * so RPC entry paths need not check it.
+ * Do the work of registering for the AST_APC callback.
+ *
+ * Called with the thread mutex and scheduling lock held.
*/
-void act_execute_returnhandlers(
- void)
+static void
+thread_set_apc_ast_locked(thread_t thread)
{
- spl_t s;
- thread_t thread;
- thread_act_t thr_act = current_act();
-
-#if MACH_ASSERT
- if (watchacts & WA_ACT_HDLR)
- printf("execute_rtn_hdlrs: thr_act=%x\n", thr_act);
-#endif /* MACH_ASSERT */
-
- s = splsched();
- act_clr_apc(thr_act);
- spllo();
- while (1) {
- ReturnHandler *rh;
-
- /* Grab the next returnhandler */
- thread = act_lock_thread(thr_act);
- (void)splsched();
- thread_lock(thread);
- rh = thr_act->handlers;
- if (!rh) {
- thread_unlock(thread);
- splx(s);
- act_unlock_thread(thr_act);
- return;
+ thread_ast_set(thread, AST_APC);
+
+ if (thread == current_thread()) {
+ ast_propagate(thread);
+ } else {
+ processor_t processor = thread->last_processor;
+
+ if (processor != PROCESSOR_NULL &&
+ processor->state == PROCESSOR_RUNNING &&
+ processor->active_thread == thread) {
+ cause_ast_check(processor);
}
- thr_act->handlers = rh->next;
- thread_unlock(thread);
- spllo();
- act_unlock_thread(thr_act);
-
-#if MACH_ASSERT
- if (watchacts & WA_ACT_HDLR)
- printf( (rh == &thr_act->special_handler) ?
- "\tspecial_handler\n" : "\thandler=%x\n",
- rh->handler);
-#endif /* MACH_ASSERT */
-
- /* Execute it */
- (*rh->handler)(rh, thr_act);
}
}
/*
- * special_handler_continue
+ * Activation control support routines internal to this file:
*
- * Continuation routine for the special handler blocks. It checks
- * to see whether there has been any new suspensions. If so, it
- * installs the special handler again. Otherwise, it checks to see
- * if the current depression needs to be re-instated (it may have
- * been temporarily removed in order to get to this point in a hurry).
*/
-void
-special_handler_continue(void)
-{
- thread_act_t cur_act = current_act();
- thread_t thread = cur_act->thread;
- spl_t s;
-
- if (cur_act->suspend_count)
- install_special_handler(cur_act);
- else {
- s = splsched();
- thread_lock(thread);
- if (thread->depress_priority == -2) {
- /*
- * We were temporarily undepressed by
- * install_special_handler; restore priority
- * depression.
- */
- thread->depress_priority = thread->priority;
- thread->priority = thread->sched_pri = DEPRESSPRI;
- }
- thread_unlock(thread);
- splx(s);
- }
- thread_exception_return();
-}
/*
- * special_handler - handles suspension, termination. Called
- * with nothing locked. Returns (if it returns) the same way.
+ * thread_suspended
+ *
+ * Continuation routine for thread suspension. It checks
+ * to see whether there has been any new suspensions. If so, it
+ * installs the AST_APC handler again.
*/
-void
-special_handler(
- ReturnHandler *rh,
- thread_act_t cur_act)
+__attribute__((noreturn))
+static void
+thread_suspended(__unused void *parameter, wait_result_t result)
{
- spl_t s;
- thread_t lthread;
- thread_t thread = act_lock_thread(cur_act);
- unsigned alert_bits;
- exception_data_type_t
- codes[EXCEPTION_CODE_MAX];
- kern_return_t kr;
- kern_return_t exc_kr;
-
- assert(thread != THREAD_NULL);
-#if MACH_ASSERT
- if (watchacts & WA_ACT_HDLR)
- printf("\t\tspecial_handler(thr_act=%x(%d))\n", cur_act,
- (cur_act ? cur_act->ref_count : 0));
-#endif /* MACH_ASSERT */
-
- s = splsched();
-
- thread_lock(thread);
- thread->state &= ~TH_ABORT; /* clear any aborts */
- thread_unlock(thread);
- splx(s);
-
- /*
- * If someone has killed this invocation,
- * invoke the return path with a terminated exception.
- */
- if (!cur_act->active) {
- act_unlock_thread(cur_act);
- act_machine_return(KERN_TERMINATED);
- }
+ thread_t thread = current_thread();
-#ifdef CALLOUT_RPC_MODEL
- /*
- * JMM - We don't intend to support this RPC model in Darwin.
- * We will support inheritance through chains of activations
- * on shuttles, but it will be universal and not just for RPC.
- * As such, each activation will always have a base shuttle.
- * Our RPC model will probably even support the notion of
- * alerts (thrown up the chain of activations to affect the
- * work done on our behalf), but the unlinking of the shuttles
- * will be completely difference because we will never have
- * to clone them.
- */
+ thread_mtx_lock(thread);
- /* strip server terminated bit */
- alert_bits = cur_act->alerts & (~SERVER_TERMINATED);
-
- /* clear server terminated bit */
- cur_act->alerts &= ~SERVER_TERMINATED;
-
- if ( alert_bits ) {
- /*
- * currently necessary to coordinate with the exception
- * code -fdr
- */
- act_unlock_thread(cur_act);
-
- /* upcall exception/alert port */
- codes[0] = alert_bits;
-
- /*
- * Exception makes a lot of assumptions. If there is no
- * exception handler or the exception reply is broken, the
- * thread will be terminated and exception will not return. If
- * we decide we don't like that behavior, we need to check
- * for the existence of an exception port before we call
- * exception.
- */
- exc_kr = exception( EXC_RPC_ALERT, codes, 1 );
-
- /* clear the orphaned and time constraint indications */
- cur_act->alerts &= ~(ORPHANED | TIME_CONSTRAINT_UNSATISFIED);
-
- /* if this orphaned activation should be terminated... */
- if (exc_kr == KERN_RPC_TERMINATE_ORPHAN) {
- /*
- * ... terminate the activation
- *
- * This is done in two steps. First, the activation is
- * disabled (prepared for termination); second, the
- * `special_handler()' is executed again -- this time
- * to terminate the activation.
- * (`act_disable_task_locked()' arranges for the
- * additional execution of the `special_handler().')
- */
-
-#if THREAD_SWAPPER
- thread_swap_disable(cur_act);
-#endif /* THREAD_SWAPPER */
-
- /* acquire appropriate locks */
- task_lock(cur_act->task);
- act_lock_thread(cur_act);
-
- /* detach the activation from its task */
- kr = act_disable_task_locked(cur_act);
- assert( kr == KERN_SUCCESS );
-
- /* release locks */
- task_unlock(cur_act->task);
- }
- else {
- /* acquire activation lock again (released below) */
- act_lock_thread(cur_act);
- s = splsched();
- thread_lock(thread);
- if (thread->depress_priority == -2) {
- /*
- * We were temporarily undepressed by
- * install_special_handler; restore priority
- * depression.
- */
- thread->depress_priority = thread->priority;
- thread->priority = thread->sched_pri = DEPRESSPRI;
- }
- thread_unlock(thread);
- splx(s);
- }
+ if (result == THREAD_INTERRUPTED) {
+ thread->suspend_parked = FALSE;
+ } else {
+ assert(thread->suspend_parked == FALSE);
}
-#endif /* CALLOUT_RPC_MODEL */
- /*
- * If we're suspended, go to sleep and wait for someone to wake us up.
- */
- if (cur_act->suspend_count) {
- if( cur_act->handlers == NULL ) {
- assert_wait((event_t)&cur_act->suspend_count,
- THREAD_ABORTSAFE);
- act_unlock_thread(cur_act);
- thread_block(special_handler_continue);
- /* NOTREACHED */
- }
- special_handler_continue();
+ if (thread->suspend_count > 0) {
+ thread_set_apc_ast(thread);
}
- act_unlock_thread(cur_act);
-}
+ thread_mtx_unlock(thread);
-/*
- * Try to nudge a thr_act into executing its returnhandler chain.
- * Ensures that the activation will execute its returnhandlers
- * before it next executes any of its user-level code.
- *
- * Called with thr_act's act_lock() and "appropriate" thread-related
- * locks held. (See act_lock_thread().) Returns same way.
- */
-void
-nudge(thread_act_t thr_act)
-{
-#if MACH_ASSERT
- if (watchacts & WA_ACT_HDLR)
- printf("\tact_%x: nudge(%x)\n", current_act(), thr_act);
-#endif /* MACH_ASSERT */
-
- /*
- * Don't need to do anything at all if this thr_act isn't the topmost.
- */
- if (thr_act->thread && thr_act->thread->top_act == thr_act) {
- /*
- * If it's suspended, wake it up.
- * This should nudge it even on another CPU.
- */
- thread_wakeup((event_t)&thr_act->suspend_count);
- }
+ thread_exception_return();
+ /*NOTREACHED*/
}
/*
- * Update activation that belongs to a task created via kernel_task_create().
+ * thread_apc_ast - handles AST_APC and drives thread suspension and termination.
+ * Called with nothing locked. Returns (if it returns) the same way.
*/
void
-act_user_to_kernel(
- thread_act_t thr_act)
+thread_apc_ast(thread_t thread)
{
- pcb_user_to_kernel(thr_act);
- thr_act->kernel_loading = TRUE;
-}
+ thread_mtx_lock(thread);
-/*
- * Already locked: thr_act->task, RPC-related locks for thr_act
- *
- * Detach an activation from its task, and prepare it to terminate
- * itself.
- */
-kern_return_t
-act_disable_task_locked(
- thread_act_t thr_act)
-{
- thread_t thread = thr_act->thread;
- task_t task = thr_act->task;
-
-#if MACH_ASSERT
- if (watchacts & WA_EXIT) {
- printf("act_%x: act_disable_tl(thr_act=%x(%d))%sactive task=%x(%d)",
- current_act(), thr_act, thr_act->ref_count,
- (thr_act->active ? " " : " !"),
- thr_act->task, thr_act->task? thr_act->task->ref_count : 0);
- if (thr_act->pool_port)
- printf(", pool_port %x", thr_act->pool_port);
- printf("\n");
- (void) dump_act(thr_act);
- }
-#endif /* MACH_ASSERT */
-
- /* This will allow no more control ops on this thr_act. */
- thr_act->active = 0;
- ipc_thr_act_disable(thr_act);
+ assert(thread->suspend_parked == FALSE);
- /* Clean-up any ulocks that are still owned by the thread
- * activation (acquired but not released or handed-off).
- */
- act_ulock_release_all(thr_act);
+ spl_t s = splsched();
+ thread_lock(thread);
- /* When the special_handler gets executed,
- * it will see the terminated condition and exit
- * immediately.
- */
- install_special_handler(thr_act);
+ /* TH_SFLAG_POLLDEPRESS is OK to have here */
+ assert((thread->sched_flags & TH_SFLAG_DEPRESS) == 0);
+ thread->sched_flags &= ~TH_SFLAG_ABORTED_MASK;
+ thread_unlock(thread);
+ splx(s);
- /* If the target happens to be suspended,
- * give it a nudge so it can exit.
- */
- if (thr_act->suspend_count)
- nudge(thr_act);
+ if (!thread->active) {
+ /* Thread is ready to terminate, time to tear it down */
+ thread_mtx_unlock(thread);
- /* Drop the thr_act reference taken for being active.
- * (There is still at least one reference left:
- * the one we were passed.)
- * Inline the deallocate because thr_act is locked.
- */
- act_locked_act_deallocate(thr_act);
+ thread_terminate_self();
+ /*NOTREACHED*/
+ }
- return(KERN_SUCCESS);
-}
+ /* If we're suspended, go to sleep and wait for someone to wake us up. */
+ if (thread->suspend_count > 0) {
+ thread->suspend_parked = TRUE;
+ assert_wait(&thread->suspend_count,
+ THREAD_ABORTSAFE | THREAD_WAIT_NOREPORT_USER);
+ thread_mtx_unlock(thread);
-/*
- * act_alert - Register an alert from this activation.
- *
- * Each set bit is propagated upward from (but not including) this activation,
- * until the top of the chain is reached or the bit is masked.
- */
-kern_return_t
-act_alert(thread_act_t thr_act, unsigned alerts)
-{
- thread_t thread = act_lock_thread(thr_act);
-
-#if MACH_ASSERT
- if (watchacts & WA_ACT_LNK)
- printf("act_alert %x: %x\n", thr_act, alerts);
-#endif /* MACH_ASSERT */
-
- if (thread) {
- thread_act_t act_up = thr_act;
- while ((alerts) && (act_up != thread->top_act)) {
- act_up = act_up->higher;
- alerts &= act_up->alert_mask;
- act_up->alerts |= alerts;
- }
- /*
- * XXXX If we reach the top, and it is blocked in glue
- * code, do something to kick it. XXXX
- */
+ thread_block(thread_suspended);
+ /*NOTREACHED*/
}
- act_unlock_thread(thr_act);
- return KERN_SUCCESS;
+ thread_mtx_unlock(thread);
}
-kern_return_t act_alert_mask(thread_act_t thr_act, unsigned alert_mask)
-{
- panic("act_alert_mask NOT YET IMPLEMENTED\n");
- return KERN_SUCCESS;
-}
-typedef struct GetSetState {
- struct ReturnHandler rh;
- int flavor;
- void *state;
- int *pcount;
- int result;
-} GetSetState;
-
-/* Local Forward decls */
-kern_return_t get_set_state(
- thread_act_t thr_act, int flavor,
- thread_state_t state, int *pcount,
- void (*handler)(ReturnHandler *rh, thread_act_t thr_act));
-void get_state_handler(ReturnHandler *rh, thread_act_t thr_act);
-void set_state_handler(ReturnHandler *rh, thread_act_t thr_act);
+/* Prototype, see justification above */
+kern_return_t
+act_set_state(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t count);
-/*
- * get_set_state(thr_act ...)
- *
- * General code to install g/set_state handler.
- * Called with thr_act's act_lock() and "appropriate"
- * thread-related locks held. (See act_lock_thread().)
- */
kern_return_t
-get_set_state(thread_act_t thr_act, int flavor, thread_state_t state, int *pcount,
- void (*handler)(ReturnHandler *rh, thread_act_t thr_act))
+act_set_state(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t count)
{
- GetSetState gss;
- spl_t s;
-
- /* Initialize a small parameter structure */
- gss.rh.handler = handler;
- gss.flavor = flavor;
- gss.state = state;
- gss.pcount = pcount;
- gss.result = KERN_ABORTED; /* iff wait below is interrupted */
-
- /* Add it to the thr_act's return handler list */
- gss.rh.next = thr_act->handlers;
- thr_act->handlers = &gss.rh;
-
- s = splsched();
- act_set_apc(thr_act);
- splx(s);
-
-#if MACH_ASSERT
- if (watchacts & WA_ACT_HDLR) {
- printf("act_%x: get_set_state(thr_act=%x flv=%x state=%x ptr@%x=%x)",
- current_act(), thr_act, flavor, state,
- pcount, (pcount ? *pcount : 0));
- printf((handler == get_state_handler ? "get_state_hdlr\n" :
- (handler == set_state_handler ? "set_state_hdlr\n" :
- "hndler=%x\n")), handler);
- }
-#endif /* MACH_ASSERT */
-
- assert(thr_act->thread); /* Callers must ensure these */
- assert(thr_act != current_act());
- for (;;) {
- nudge(thr_act);
- /*
- * Wait must be interruptible to avoid deadlock (e.g.) with
- * task_suspend() when caller and target of get_set_state()
- * are in same task.
- */
- assert_wait((event_t)&gss, THREAD_ABORTSAFE);
- act_unlock_thread(thr_act);
- thread_block((void (*)(void))0);
- if (gss.result != KERN_ABORTED)
- break;
- if (current_act()->handlers)
- act_execute_returnhandlers();
- act_lock_thread(thr_act);
+ if (thread == current_thread()) {
+ return KERN_INVALID_ARGUMENT;
}
-#if MACH_ASSERT
- if (watchacts & WA_ACT_HDLR)
- printf("act_%x: get_set_state returns %x\n",
- current_act(), gss.result);
-#endif /* MACH_ASSERT */
-
- return gss.result;
+ return thread_set_state(thread, flavor, state, count);
}
-void
-set_state_handler(ReturnHandler *rh, thread_act_t thr_act)
+kern_return_t
+act_set_state_from_user(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t count)
{
- GetSetState *gss = (GetSetState*)rh;
-
-#if MACH_ASSERT
- if (watchacts & WA_ACT_HDLR)
- printf("act_%x: set_state_handler(rh=%x,thr_act=%x)\n",
- current_act(), rh, thr_act);
-#endif /* MACH_ASSERT */
-
- gss->result = act_machine_set_state(thr_act, gss->flavor,
- gss->state, *gss->pcount);
- thread_wakeup((event_t)gss);
-}
+ if (thread == current_thread()) {
+ return KERN_INVALID_ARGUMENT;
+ }
-void
-get_state_handler(ReturnHandler *rh, thread_act_t thr_act)
-{
- GetSetState *gss = (GetSetState*)rh;
-
-#if MACH_ASSERT
- if (watchacts & WA_ACT_HDLR)
- printf("act_%x: get_state_handler(rh=%x,thr_act=%x)\n",
- current_act(), rh, thr_act);
-#endif /* MACH_ASSERT */
-
- gss->result = act_machine_get_state(thr_act, gss->flavor,
- gss->state,
- (mach_msg_type_number_t *) gss->pcount);
- thread_wakeup((event_t)gss);
+ return thread_set_state_from_user(thread, flavor, state, count);
}
+/* Prototype, see justification above */
kern_return_t
-act_get_state_locked(thread_act_t thr_act, int flavor, thread_state_t state,
- mach_msg_type_number_t *pcount)
-{
-#if MACH_ASSERT
- if (watchacts & WA_ACT_HDLR)
- printf("act_%x: act_get_state_L(thr_act=%x,flav=%x,st=%x,pcnt@%x=%x)\n",
- current_act(), thr_act, flavor, state, pcount,
- (pcount? *pcount : 0));
-#endif /* MACH_ASSERT */
-
- return(get_set_state(thr_act, flavor, state, (int*)pcount, get_state_handler));
-}
+act_get_state(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t *count);
kern_return_t
-act_set_state_locked(thread_act_t thr_act, int flavor, thread_state_t state,
- mach_msg_type_number_t count)
+act_get_state(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t *count)
{
-#if MACH_ASSERT
- if (watchacts & WA_ACT_HDLR)
- printf("act_%x: act_set_state_L(thr_act=%x,flav=%x,st=%x,pcnt@%x=%x)\n",
- current_act(), thr_act, flavor, state, count, count);
-#endif /* MACH_ASSERT */
+ if (thread == current_thread()) {
+ return KERN_INVALID_ARGUMENT;
+ }
- return(get_set_state(thr_act, flavor, state, (int*)&count, set_state_handler));
+ return thread_get_state(thread, flavor, state, count);
}
kern_return_t
-act_set_state(thread_act_t thr_act, int flavor, thread_state_t state,
- mach_msg_type_number_t count)
+act_get_state_to_user(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t *count)
{
- if (thr_act == THR_ACT_NULL || thr_act == current_act())
- return(KERN_INVALID_ARGUMENT);
+ if (thread == current_thread()) {
+ return KERN_INVALID_ARGUMENT;
+ }
- act_lock_thread(thr_act);
- return(act_set_state_locked(thr_act, flavor, state, count));
-
+ return thread_get_state_to_user(thread, flavor, state, count);
}
-kern_return_t
-act_get_state(thread_act_t thr_act, int flavor, thread_state_t state,
- mach_msg_type_number_t *pcount)
+static void
+act_set_ast(
+ thread_t thread,
+ ast_t ast)
{
- if (thr_act == THR_ACT_NULL || thr_act == current_act())
- return(KERN_INVALID_ARGUMENT);
+ spl_t s = splsched();
- act_lock_thread(thr_act);
- return(act_get_state_locked(thr_act, flavor, state, pcount));
+ if (thread == current_thread()) {
+ thread_ast_set(thread, ast);
+ ast_propagate(thread);
+ } else {
+ processor_t processor;
+
+ thread_lock(thread);
+ thread_ast_set(thread, ast);
+ processor = thread->last_processor;
+ if (processor != PROCESSOR_NULL &&
+ processor->state == PROCESSOR_RUNNING &&
+ processor->active_thread == thread) {
+ cause_ast_check(processor);
+ }
+ thread_unlock(thread);
+ }
+
+ splx(s);
}
/*
- * These two should be called at splsched()
- * Set/clear indicator to run APC (layered on ASTs)
+ * set AST on thread without causing an AST check
+ * and without taking the thread lock
+ *
+ * If thread is not the current thread, then it may take
+ * up until the next context switch or quantum expiration
+ * on that thread for it to notice the AST.
*/
-void
-act_set_apc(thread_act_t thr_act)
+static void
+act_set_ast_async(thread_t thread,
+ ast_t ast)
{
- thread_ast_set(thr_act, AST_APC);
- if (thr_act == current_act()) {
- mp_disable_preemption();
- ast_propagate(thr_act->ast);
- mp_enable_preemption();
+ thread_ast_set(thread, ast);
+
+ if (thread == current_thread()) {
+ spl_t s = splsched();
+ ast_propagate(thread);
+ splx(s);
}
}
void
-act_clr_apc(thread_act_t thr_act)
+act_set_astbsd(
+ thread_t thread)
{
- thread_ast_clear(thr_act, AST_APC);
+ act_set_ast( thread, AST_BSD );
}
void
-act_ulock_release_all(thread_act_t thr_act)
+act_set_astkevent(thread_t thread, uint16_t bits)
{
- ulock_t ulock;
+ os_atomic_or(&thread->kevent_ast_bits, bits, relaxed);
+
+ /* kevent AST shouldn't send immediate IPIs */
+ act_set_ast_async(thread, AST_KEVENT);
+}
- while (!queue_empty(&thr_act->held_ulocks)) {
- ulock = (ulock_t) queue_first(&thr_act->held_ulocks);
- (void) lock_make_unstable(ulock, thr_act);
- (void) lock_release_internal(ulock, thr_act);
+uint16_t
+act_clear_astkevent(thread_t thread, uint16_t bits)
+{
+ /*
+ * avoid the atomic operation if none of the bits is set,
+ * which will be the common case.
+ */
+ uint16_t cur = os_atomic_load(&thread->kevent_ast_bits, relaxed);
+ if (cur & bits) {
+ cur = os_atomic_andnot_orig(&thread->kevent_ast_bits, bits, relaxed);
}
+ return cur & bits;
}
-/*
- * Provide routines (for export to other components) of things that
- * are implemented as macros insternally.
- */
-#undef current_act
-thread_act_t
-current_act(void)
+void
+act_set_ast_reset_pcs(thread_t thread)
{
- return(current_act_fast());
+ act_set_ast(thread, AST_RESET_PCS);
}
-thread_act_t
-thread_self(void)
+void
+act_set_kperf(
+ thread_t thread)
{
- thread_act_t self = current_act_fast();
+ /* safety check */
+ if (thread != current_thread()) {
+ if (!ml_get_interrupts_enabled()) {
+ panic("unsafe act_set_kperf operation");
+ }
+ }
- act_reference(self);
- return self;
+ act_set_ast( thread, AST_KPERF );
}
-thread_act_t
-mach_thread_self(void)
+#if CONFIG_MACF
+void
+act_set_astmacf(
+ thread_t thread)
{
- thread_act_t self = current_act_fast();
-
- act_reference(self);
- return self;
+ act_set_ast( thread, AST_MACF);
}
+#endif
-#undef act_reference
void
-act_reference(
- thread_act_t thr_act)
+act_set_astledger(thread_t thread)
{
- act_reference_fast(thr_act);
+ act_set_ast(thread, AST_LEDGER);
}
-#undef act_deallocate
+/*
+ * The ledger AST may need to be set while already holding
+ * the thread lock. This routine skips sending the IPI,
+ * allowing us to avoid the lock hold.
+ *
+ * However, it means the targeted thread must context switch
+ * to recognize the ledger AST.
+ */
void
-act_deallocate(
- thread_act_t thr_act)
+act_set_astledger_async(thread_t thread)
{
- act_deallocate_fast(thr_act);
+ act_set_ast_async(thread, AST_LEDGER);
}
+void
+act_set_io_telemetry_ast(thread_t thread)
+{
+ act_set_ast(thread, AST_TELEMETRY_IO);
+}
projects / apple / xnu.git / blobdiff