/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2016 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_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 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.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * 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.
+ * 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_LICENSE_HEADER_END@
+ * @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/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/mk_sp.h> /*** ??? fix so this can be removed ***/
#include <kern/processor.h>
-#include <mach_prof.h>
-#include <mach/rpc.h>
+#include <kern/timer.h>
+#include <kern/affinity.h>
-/*
- * Track the number of times we need to swapin a thread to deallocate it.
- */
-int act_free_swapin = 0;
+#include <stdatomic.h>
+
+#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, boolean_t);
-void special_handler(ReturnHandler *, 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_astbsd(thread_act_t);
-void act_set_apc(thread_act_t);
-void act_ulock_release_all(thread_act_t thr_act);
-
-void install_special_handler_locked(thread_act_t);
-
-static void act_disable(thread_act_t);
+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.
*/
kern_return_t
thread_terminate_internal(
- register thread_act_t act)
+ thread_t thread)
{
- kern_return_t result;
- thread_t thread;
+ kern_return_t result = KERN_SUCCESS;
- thread = act_lock_thread(act);
+ thread_mtx_lock(thread);
- if (!act->active) {
- act_unlock_thread(act);
- return (KERN_TERMINATED);
- }
+ if (thread->active) {
+ thread->active = FALSE;
- act_disable(act);
- result = act_abort(act, FALSE);
+ act_abort(thread);
- /*
- * Make sure this thread enters the kernel
- * Must unlock the act, but leave the shuttle
- * captured in this act.
- */
- if (thread != current_thread()) {
- act_unlock(act);
+ if (thread->started)
+ clear_wait(thread, THREAD_INTERRUPTED);
+ else {
+ thread_start(thread);
+ }
+ }
+ else
+ result = KERN_TERMINATED;
- if (thread_stop(thread))
- thread_unstop(thread);
- else
- result = KERN_ABORTED;
+ if (thread->affinity_set != NULL)
+ thread_affinity_terminate(thread);
- act_lock(act);
- }
+ thread_mtx_unlock(thread);
- clear_wait(thread, act->started? THREAD_INTERRUPTED: THREAD_AWAKENED);
- act_unlock_thread(act);
+ if (thread != current_thread() && result == KERN_SUCCESS)
+ thread_wait(thread, FALSE);
return (result);
}
*/
kern_return_t
thread_terminate(
- register thread_act_t act)
+ thread_t thread)
{
- kern_return_t result;
-
- if (act == THR_ACT_NULL)
+ if (thread == THREAD_NULL)
return (KERN_INVALID_ARGUMENT);
- if ( act->task == kernel_task &&
- act != current_act() )
+ /* Kernel threads can't be terminated without their own cooperation */
+ if (thread->task == kernel_task && thread != current_thread())
return (KERN_FAILURE);
- result = thread_terminate_internal(act);
+ kern_return_t result = thread_terminate_internal(thread);
/*
- * 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 (act->task == kernel_task) {
- ml_set_interrupts_enabled(FALSE);
- assert(act == current_act());
- ast_taken(AST_APC, TRUE);
+ if (thread->task == kernel_task) {
+ assert(thread->active == FALSE);
+ thread_ast_clear(thread, AST_APC);
+ thread_apc_ast(thread);
+
panic("thread_terminate");
+ /* NOTREACHED */
}
return (result);
* This is a recursive-style suspension of the thread, a count of
* suspends is maintained.
*
- * Called with act_lock held.
+ * Called with thread mutex held.
*/
void
-thread_hold(
- register thread_act_t act)
+thread_hold(thread_t thread)
{
- thread_t thread = act->thread;
-
- if (act->suspend_count++ == 0) {
- install_special_handler(act);
- if ( act->started &&
- thread != THREAD_NULL &&
- thread->top_act == act )
- thread_wakeup_one(&act->suspend_count);
+ 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 act_lock held.
+ * 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 act)
+thread_release(thread_t thread)
{
- thread_t thread = act->thread;
-
- if ( act->suspend_count > 0 &&
- --act->suspend_count == 0 &&
- thread != THREAD_NULL &&
- thread->top_act == act ) {
- if (!act->started) {
- clear_wait(thread, THREAD_AWAKENED);
- act->started = TRUE;
+ 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);
}
- else
- thread_wakeup_one(&act->suspend_count);
}
}
kern_return_t
-thread_suspend(
- register thread_act_t act)
+thread_suspend(thread_t thread)
{
- thread_t thread;
+ kern_return_t result = KERN_SUCCESS;
- if (act == THR_ACT_NULL || act->task == kernel_task)
+ if (thread == THREAD_NULL || thread->task == kernel_task)
return (KERN_INVALID_ARGUMENT);
- thread = act_lock_thread(act);
+ thread_mtx_lock(thread);
- if (!act->active) {
- act_unlock_thread(act);
- return (KERN_TERMINATED);
+ if (thread->active) {
+ if (thread->user_stop_count++ == 0)
+ thread_hold(thread);
+ } else {
+ result = KERN_TERMINATED;
}
- if ( act->user_stop_count++ == 0 &&
- act->suspend_count++ == 0 ) {
- install_special_handler(act);
- if ( thread != current_thread() &&
- thread != THREAD_NULL &&
- thread->top_act == act ) {
- assert(act->started);
- thread_wakeup_one(&act->suspend_count);
- act_unlock_thread(act);
-
- thread_wait(thread);
- }
- else
- act_unlock_thread(act);
- }
- else
- act_unlock_thread(act);
+ thread_mtx_unlock(thread);
- return (KERN_SUCCESS);
+ if (thread != current_thread() && result == KERN_SUCCESS)
+ thread_wait(thread, FALSE);
+
+ return (result);
}
kern_return_t
-thread_resume(
- register thread_act_t act)
+thread_resume(thread_t thread)
{
- kern_return_t result = KERN_SUCCESS;
- thread_t thread;
+ kern_return_t result = KERN_SUCCESS;
- if (act == THR_ACT_NULL || act->task == kernel_task)
+ if (thread == THREAD_NULL || thread->task == kernel_task)
return (KERN_INVALID_ARGUMENT);
- thread = act_lock_thread(act);
-
- if (act->active) {
- if (act->user_stop_count > 0) {
- if ( --act->user_stop_count == 0 &&
- --act->suspend_count == 0 &&
- thread != THREAD_NULL &&
- thread->top_act == act ) {
- if (!act->started) {
- clear_wait(thread, THREAD_AWAKENED);
- act->started = TRUE;
- }
- else
- thread_wakeup_one(&act->suspend_count);
- }
- }
- else
+ thread_mtx_lock(thread);
+
+ if (thread->active) {
+ if (thread->user_stop_count > 0) {
+ if (--thread->user_stop_count == 0)
+ thread_release(thread);
+ } else {
result = KERN_FAILURE;
- }
- else
+ }
+ } else {
result = KERN_TERMINATED;
+ }
- act_unlock_thread(act);
+ 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;
+ kern_return_t result;
- if (thr_act == THR_ACT_NULL)
+ if (thread == THREAD_NULL)
return (KERN_INVALID_ARGUMENT);
- thread = act_lock_thread(thr_act);
- /* if activation is terminating, this operation is not meaningful */
- if (!thr_act->active) {
- act_unlock_thread(thr_act);
+ thread_mtx_lock(thread);
- return (KERN_TERMINATED);
- }
-
- result = _mk_sp_thread_depress_abort(thread, FALSE);
+ if (thread->active)
+ result = thread_depress_abort(thread);
+ else
+ result = KERN_TERMINATED;
- act_unlock_thread(thr_act);
+ thread_mtx_unlock(thread);
return (result);
}
/*
- * Indicate that the activation should run its
- * special handler to detect the condition.
+ * Indicate that the thread should run the AST_APC callback
+ * to detect an abort condition.
*
- * Called with act_lock held.
+ * Called with thread mutex held.
*/
-kern_return_t
+static void
act_abort(
- thread_act_t act,
- boolean_t chain_break )
+ thread_t thread)
{
- thread_t thread = act->thread;
spl_t s = splsched();
- assert(thread->top_act == act);
-
thread_lock(thread);
- if (!(thread->state & TH_ABORT)) {
- thread->state |= TH_ABORT;
- install_special_handler_locked(act);
+
+ 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->state &= ~TH_ABORT_SAFELY;
+ thread->sched_flags &= ~TH_SFLAG_ABORTSAFELY;
}
+
thread_unlock(thread);
splx(s);
-
- return (KERN_SUCCESS);
}
-
+
kern_return_t
thread_abort(
- register thread_act_t act)
+ thread_t thread)
{
- kern_return_t result;
- thread_t thread;
+ kern_return_t result = KERN_SUCCESS;
- if (act == THR_ACT_NULL)
+ if (thread == THREAD_NULL)
return (KERN_INVALID_ARGUMENT);
- thread = act_lock_thread(act);
+ thread_mtx_lock(thread);
- if (!act->active) {
- act_unlock_thread(act);
- return (KERN_TERMINATED);
+ if (thread->active) {
+ act_abort(thread);
+ clear_wait(thread, THREAD_INTERRUPTED);
}
+ else
+ result = KERN_TERMINATED;
- result = act_abort(act, FALSE);
- clear_wait(thread, THREAD_INTERRUPTED);
- act_unlock_thread(act);
+ thread_mtx_unlock(thread);
return (result);
}
kern_return_t
thread_abort_safely(
- thread_act_t act)
+ thread_t thread)
{
- thread_t thread;
- kern_return_t ret;
- spl_t s;
+ kern_return_t result = KERN_SUCCESS;
- if ( act == THR_ACT_NULL )
+ if (thread == THREAD_NULL)
return (KERN_INVALID_ARGUMENT);
- thread = act_lock_thread(act);
+ thread_mtx_lock(thread);
- if (!act->active) {
- act_unlock_thread(act);
- return (KERN_TERMINATED);
- }
+ if (thread->active) {
+ spl_t s = splsched();
- s = splsched();
- thread_lock(thread);
- if (!thread->at_safe_point ||
- clear_wait_internal(thread, THREAD_INTERRUPTED) != KERN_SUCCESS) {
- if (!(thread->state & TH_ABORT)) {
- thread->state |= (TH_ABORT|TH_ABORT_SAFELY);
- install_special_handler_locked(act);
+ 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);
+ splx(s);
+ } else {
+ result = KERN_TERMINATED;
}
- thread_unlock(thread);
- splx(s);
-
- act_unlock_thread(act);
- return (KERN_SUCCESS);
+ 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_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;
- if (thr_act == THR_ACT_NULL)
+ 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);
- }
-
- result = thread_info_shuttle(thr_act, flavor,
- thread_info_out, thread_info_count);
+ if (thread->active || thread->inspection)
+ result = thread_info_internal(
+ thread, flavor, thread_info_out, thread_info_count);
+ else
+ result = KERN_TERMINATED;
- act_unlock_thread(thr_act);
+ thread_mtx_unlock(thread);
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;
-
- if (!thr_act)
- 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;
- }
+ kern_return_t result = KERN_SUCCESS;
- if (!thr_act->active) {
- act_unlock_thread(thr_act);
- return KERN_FAILURE;
- }
+ if (thread == THREAD_NULL)
+ return (KERN_INVALID_ARGUMENT);
- port = ipc_port_copy_send(*whichp);
- act_unlock_thread(thr_act);
+ thread_mtx_lock(thread);
- *portp = port;
- return KERN_SUCCESS;
-}
+ if (thread->active) {
+ if (thread != current_thread()) {
+ thread_hold(thread);
-/*
- * 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.
- */
+ thread_mtx_unlock(thread);
-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;
-
- if (thr_act == 0)
- return KERN_INVALID_ARGUMENT;
-
- thread = act_lock_thread(thr_act);
- switch (which) {
- case THREAD_KERNEL_PORT:
- whichp = &thr_act->ith_self;
- break;
-
- default:
- act_unlock_thread(thr_act);
- return KERN_INVALID_ARGUMENT;
+ 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;
+ }
+
+ 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(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t *state_count);
+
kern_return_t
thread_get_state(
- register thread_act_t act,
+ thread_t thread,
int flavor,
thread_state_t state, /* pointer to OUT array */
mach_msg_type_number_t *state_count) /*IN/OUT*/
{
- kern_return_t result = KERN_SUCCESS;
- thread_t thread;
-
- if (act == THR_ACT_NULL || act == current_act())
- return (KERN_INVALID_ARGUMENT);
-
- thread = act_lock_thread(act);
-
- if (!act->active) {
- act_unlock_thread(act);
- return (KERN_TERMINATED);
- }
-
- thread_hold(act);
-
- for (;;) {
- thread_t thread1;
-
- if ( thread == THREAD_NULL ||
- thread->top_act != act )
- break;
- act_unlock_thread(act);
-
- if (!thread_stop(thread)) {
- result = KERN_ABORTED;
- (void)act_lock_thread(act);
- thread = THREAD_NULL;
- break;
- }
-
- thread1 = act_lock_thread(act);
- if (thread1 == thread)
- break;
-
- thread_unstop(thread);
- thread = thread1;
- }
-
- if (result == KERN_SUCCESS)
- result = machine_thread_get_state(act, flavor, state, state_count);
-
- if ( thread != THREAD_NULL &&
- thread->top_act == act )
- thread_unstop(thread);
-
- thread_release(act);
- act_unlock_thread(act);
+ return thread_get_state_internal(thread, flavor, state, state_count, FALSE);
+}
- return (result);
+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 act,
+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)
+ mach_msg_type_number_t state_count,
+ boolean_t from_user)
{
kern_return_t result = KERN_SUCCESS;
- thread_t thread;
- if (act == THR_ACT_NULL || act == current_act())
+ if (thread == THREAD_NULL)
return (KERN_INVALID_ARGUMENT);
- thread = act_lock_thread(act);
-
- if (!act->active) {
- act_unlock_thread(act);
- return (KERN_TERMINATED);
- }
+ thread_mtx_lock(thread);
- thread_hold(act);
+ 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);
- for (;;) {
- thread_t thread1;
+ thread_mtx_unlock(thread);
- if ( thread == THREAD_NULL ||
- thread->top_act != act )
- break;
- act_unlock_thread(act);
+ 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;
+ }
- if (!thread_stop(thread)) {
- result = KERN_ABORTED;
- (void)act_lock_thread(act);
- thread = THREAD_NULL;
- break;
+ thread_release(thread);
}
-
- thread1 = act_lock_thread(act);
- if (thread1 == thread)
- break;
-
- thread_unstop(thread);
- thread = thread1;
+ else
+ result = machine_thread_set_state(
+ thread, flavor, state, state_count);
}
+ else
+ result = KERN_TERMINATED;
- if (result == KERN_SUCCESS)
- result = machine_thread_set_state(act, flavor, state, state_count);
-
- if ( thread != THREAD_NULL &&
- thread->top_act == act )
- thread_unstop(thread);
+ if ((result == KERN_SUCCESS) && from_user)
+ extmod_statistics_incr_thread_set_state(thread);
- thread_release(act);
- act_unlock_thread(act);
+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);
+
+kern_return_t
+thread_set_state(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t state_count)
+{
+ return thread_set_state_internal(thread, flavor, state, state_count, FALSE);
+}
+
+kern_return_t
+thread_set_state_from_user(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t state_count)
+{
+ return thread_set_state_internal(thread, flavor, state, state_count, TRUE);
+}
+
/*
* Kernel-internal "thread" interfaces used outside this file:
*/
+/* Initialize (or re-initialize) a thread state. Called from execve
+ * with nothing locked, returns same way.
+ */
kern_return_t
-thread_dup(
- register thread_act_t target)
+thread_state_initialize(
+ thread_t thread)
{
kern_return_t result = KERN_SUCCESS;
- thread_act_t self = current_act();
- thread_t thread;
- if (target == THR_ACT_NULL || target == self)
+ if (thread == THREAD_NULL)
return (KERN_INVALID_ARGUMENT);
- thread = act_lock_thread(target);
+ thread_mtx_lock(thread);
- if (!target->active) {
- act_unlock_thread(target);
- return (KERN_TERMINATED);
- }
-
- thread_hold(target);
+ if (thread->active) {
+ if (thread != current_thread()) {
+ thread_hold(thread);
- for (;;) {
- thread_t thread1;
+ thread_mtx_unlock(thread);
- if ( thread == THREAD_NULL ||
- thread->top_act != target )
- break;
- act_unlock_thread(target);
+ 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;
+ }
- if (!thread_stop(thread)) {
- result = KERN_ABORTED;
- (void)act_lock_thread(target);
- thread = THREAD_NULL;
- break;
+ thread_release(thread);
}
-
- thread1 = act_lock_thread(target);
- if (thread1 == thread)
- break;
-
- thread_unstop(thread);
- thread = thread1;
+ else
+ result = machine_thread_state_initialize( thread );
}
+ else
+ result = KERN_TERMINATED;
- if (result == KERN_SUCCESS)
- result = machine_thread_dup(self, target);
-
- if ( thread != THREAD_NULL &&
- thread->top_act == target )
- thread_unstop(thread);
-
- thread_release(target);
- act_unlock_thread(target);
+ thread_mtx_unlock(thread);
return (result);
}
-/*
- * thread_setstatus:
- *
- * Set the status of the specified thread.
- * Called with (and returns with) no locks held.
- */
kern_return_t
-thread_setstatus(
- register thread_act_t act,
- int flavor,
- thread_state_t tstate,
- mach_msg_type_number_t count)
+thread_dup(
+ thread_t target)
{
+ thread_t self = current_thread();
kern_return_t result = KERN_SUCCESS;
- thread_t thread;
-
- thread = act_lock_thread(act);
- if ( act != current_act() &&
- (act->suspend_count == 0 ||
- thread == THREAD_NULL ||
- (thread->state & TH_RUN) ||
- thread->top_act != act) )
- result = KERN_FAILURE;
-
- if (result == KERN_SUCCESS)
- result = machine_thread_set_state(act, flavor, tstate, count);
+ if (target == THREAD_NULL || target == self)
+ return (KERN_INVALID_ARGUMENT);
- act_unlock_thread(act);
+ thread_mtx_lock(target);
- return (result);
-}
+ if (target->active) {
+ thread_hold(target);
-/*
- * thread_getstatus:
- *
- * Get the status of the specified thread.
- */
-kern_return_t
-thread_getstatus(
- register thread_act_t act,
- int flavor,
- thread_state_t tstate,
- mach_msg_type_number_t *count)
-{
- kern_return_t result = KERN_SUCCESS;
- thread_t thread;
+ thread_mtx_unlock(target);
- thread = act_lock_thread(act);
+ if (thread_stop(target, TRUE)) {
+ thread_mtx_lock(target);
+ result = machine_thread_dup(self, target, FALSE);
- if ( act != current_act() &&
- (act->suspend_count == 0 ||
- thread == THREAD_NULL ||
- (thread->state & TH_RUN) ||
- thread->top_act != act) )
- result = KERN_FAILURE;
+ if (self->affinity_set != AFFINITY_SET_NULL)
+ thread_affinity_dup(self, target);
+ thread_unstop(target);
+ }
+ else {
+ thread_mtx_lock(target);
+ result = KERN_ABORTED;
+ }
- if (result == KERN_SUCCESS)
- result = machine_thread_get_state(act, flavor, tstate, count);
+ thread_release(target);
+ }
+ else
+ result = KERN_TERMINATED;
- act_unlock_thread(act);
+ thread_mtx_unlock(target);
return (result);
}
-/*
- * Kernel-internal thread_activation interfaces used outside this file:
- */
-void
-act_reference(
- thread_act_t act)
-{
- if (act == NULL)
- return;
-
- act_lock(act);
- act_reference_locked(act);
- act_unlock(act);
-}
-
-void
-act_deallocate(
- thread_act_t act)
+kern_return_t
+thread_dup2(
+ thread_t source,
+ thread_t target)
{
- task_t task;
- thread_t thread;
- void *task_proc;
+ kern_return_t result = KERN_SUCCESS;
+ uint32_t active = 0;
- if (act == NULL)
- return;
+ if (source == THREAD_NULL || target == THREAD_NULL || target == source)
+ return (KERN_INVALID_ARGUMENT);
- act_lock(act);
+ thread_mtx_lock(source);
+ active = source->active;
+ thread_mtx_unlock(source);
- if (--act->act_ref_count > 0) {
- act_unlock(act);
- return;
+ if (!active) {
+ return KERN_TERMINATED;
}
- assert(!act->active);
-
- thread = act->thread;
- assert(thread != NULL);
-
- thread->top_act = NULL;
-
- act_unlock(act);
-
- task = act->task;
- task_lock(task);
-
- task_proc = task->bsd_info;
-
- {
- time_value_t user_time, system_time;
-
- thread_read_times(thread, &user_time, &system_time);
- time_value_add(&task->total_user_time, &user_time);
- time_value_add(&task->total_system_time, &system_time);
-
- queue_remove(&task->threads, act, thread_act_t, task_threads);
- act->task_threads.next = NULL;
- task->thread_count--;
- task->res_thread_count--;
- }
+ thread_mtx_lock(target);
- task_unlock(task);
+ if (target->active || target->inspection) {
+ thread_hold(target);
- act_prof_deallocate(act);
- ipc_thr_act_terminate(act);
+ thread_mtx_unlock(target);
-#ifdef MACH_BSD
- {
- extern void uthread_free(task_t, void *, void *, void *);
- void *ut = act->uthread;
+ 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;
+ }
- uthread_free(task, act, ut, task_proc);
- act->uthread = NULL;
+ thread_release(target);
}
-#endif /* MACH_BSD */
-
- task_deallocate(task);
-
- thread_deallocate(thread);
-}
+ else
+ result = KERN_TERMINATED;
+ thread_mtx_unlock(target);
-/*
- * 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.
- *
- * Already locked: thr_act plus "appropriate" thread-related locks
- * (see act_lock_thread()).
- */
-void
-act_attach(
- thread_act_t act,
- thread_t thread)
-{
- thread_act_t lower;
-
- /*
- * Chain the act onto the thread's act stack.
- */
- act->act_ref_count++;
- act->thread = thread;
- act->higher = THR_ACT_NULL;
- lower = act->lower = thread->top_act;
- if (lower != THR_ACT_NULL)
- lower->higher = act;
-
- thread->top_act = act;
+ return (result);
}
/*
- * act_detach
+ * thread_setstatus:
*
- * 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).
+ * Set the status of the specified thread.
+ * Called with (and returns with) no locks held.
*/
-void
-act_detach(
- thread_act_t cur_act)
+kern_return_t
+thread_setstatus(
+ thread_t thread,
+ int flavor,
+ thread_state_t tstate,
+ mach_msg_type_number_t count)
{
- thread_t cur_thread = cur_act->thread;
-
- /* Unlink the thr_act from the thread's thr_act stack */
- cur_thread->top_act = cur_act->lower;
- cur_act->thread = 0;
- cur_act->act_ref_count--;
- assert(cur_act->act_ref_count > 0);
-#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;
+ return (thread_set_state(thread, flavor, tstate, count));
}
-
-/*
- * Synchronize a thread operation with migration.
- * Called with nothing locked.
- * Returns with thr_act locked.
- */
-thread_t
-act_lock_thread(
- 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)
{
- /*
- * JMM - We have moved away from explicit RPC locks
- * and towards a generic migration approach. The wait
- * queue lock will be the point of synchronization for
- * the shuttle linkage when this is rolled out. Until
- * then, just lock the act.
- */
- act_lock(thr_act);
- return (thr_act->thread);
+ return (thread_set_state_from_user(thread, flavor, tstate, count));
}
/*
- * Unsynchronize with migration (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)
-{
- act_unlock(thr_act);
-}
-
-/*
- * Synchronize with migration 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_getstatus:
+ *
+ * Get the status of the specified thread.
*/
-thread_act_t
-thread_lock_act(
- thread_t thread)
+kern_return_t
+thread_getstatus(
+ thread_t thread,
+ int flavor,
+ thread_state_t tstate,
+ mach_msg_type_number_t *count)
{
- thread_act_t thr_act;
-
- while (1) {
- thr_act = thread->top_act;
- if (!thr_act)
- break;
- if (!act_lock_try(thr_act)) {
- mutex_pause();
- continue;
- }
- break;
- }
- return (thr_act);
+ return (thread_get_state(thread, flavor, tstate, count));
}
-/*
- * Unsynchronize with an activation starting from a pointer to
- * a shuttle.
- */
-void
-thread_unlock_act(
- thread_t thread)
+kern_return_t
+thread_getstatus_to_user(
+ thread_t thread,
+ int flavor,
+ thread_state_t tstate,
+ mach_msg_type_number_t *count)
{
- thread_act_t thr_act;
-
- if (thr_act = thread->top_act) {
- act_unlock(thr_act);
- }
+ return (thread_get_state_to_user(thread, flavor, tstate, count));
}
/*
- * 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 migration support.
+ * Change thread's machine-dependent userspace TSD base.
+ * Called with nothing locked. Returns same way.
*/
-thread_act_t
-switch_act(
- thread_act_t act)
+kern_return_t
+thread_set_tsd_base(
+ thread_t thread,
+ mach_vm_offset_t tsd_base)
{
- thread_act_t old, new;
- thread_t thread;
-
- disable_preemption();
+ kern_return_t result = KERN_SUCCESS;
- thread = current_thread();
+ if (thread == THREAD_NULL)
+ return (KERN_INVALID_ARGUMENT);
- /*
- * Find the old and new activation for switch.
- */
- old = thread->top_act;
+ thread_mtx_lock(thread);
- if (act) {
- new = act;
- new->thread = thread;
- }
- else {
- new = old->lower;
- }
+ if (thread->active) {
+ if (thread != current_thread()) {
+ thread_hold(thread);
- assert(new != THR_ACT_NULL);
- assert(current_processor()->active_thread == thread);
+ thread_mtx_unlock(thread);
- /* This is where all the work happens */
- machine_switch_act(thread, old, new);
+ 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;
+ }
- /*
- * Push or pop an activation on the chain.
- */
- if (act) {
- act_attach(new, thread);
- }
- else {
- act_detach(old);
+ thread_release(thread);
+ }
+ else
+ result = machine_thread_set_tsd_base(thread, tsd_base);
}
+ else
+ result = KERN_TERMINATED;
- enable_preemption();
+ thread_mtx_unlock(thread);
- return(old);
+ return (result);
}
/*
- * install_special_handler
- * Install the special returnhandler that handles suspension and
- * termination, if it hasn't been installed already.
+ * thread_set_apc_ast:
*
- * Already locked: RPC-related locks for thr_act, but not
- * scheduling lock (thread_lock()) of the associated thread.
+ * Register the AST_APC callback that handles suspension and
+ * termination, if it hasn't been installed already.
+ *
+ * Called with the thread mutex held.
*/
-void
-install_special_handler(
- thread_act_t thr_act)
+static void
+thread_set_apc_ast(thread_t thread)
{
- spl_t spl;
- thread_t thread = thr_act->thread;
+ spl_t s = splsched();
- spl = splsched();
thread_lock(thread);
- install_special_handler_locked(thr_act);
+ thread_set_apc_ast_locked(thread);
thread_unlock(thread);
- splx(spl);
+
+ splx(s);
}
/*
- * install_special_handler_locked
- * Do the work of installing the special_handler.
+ * thread_set_apc_ast_locked:
+ *
+ * Do the work of registering for the AST_APC callback.
*
- * Already locked: RPC-related locks for thr_act, plus the
- * scheduling lock (thread_lock()) of the associated thread.
+ * Called with the thread mutex and scheduling lock held.
*/
-void
-install_special_handler_locked(
- thread_act_t act)
+static void
+thread_set_apc_ast_locked(thread_t thread)
{
- thread_t thread = act->thread;
- ReturnHandler **rh;
-
- /* 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 = &act->handlers; *rh; rh = &(*rh)->next)
- continue;
- if (rh != &act->special_handler.next)
- *rh = &act->special_handler;
-
- if (act == thread->top_act) {
- /*
- * Temporarily undepress, so target has
- * a chance to do locking required to
- * block itself in special_handler().
- */
- if (thread->sched_mode & TH_MODE_ISDEPRESSED)
- compute_priority(thread, TRUE);
- }
+ thread_ast_set(thread, AST_APC);
- thread_ast_set(act, AST_APC);
- if (act == current_act())
- ast_propagate(act->ast);
- else {
- processor_t processor = thread->last_processor;
+ 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 )
+ if (processor != PROCESSOR_NULL &&
+ processor->state == PROCESSOR_RUNNING &&
+ processor->active_thread == thread) {
cause_ast_check(processor);
+ }
}
}
-kern_return_t
-thread_apc_set(
- thread_act_t act,
- thread_apc_handler_t apc)
-{
- extern thread_apc_handler_t bsd_ast;
-
- assert(apc == bsd_ast);
- return (KERN_FAILURE);
-}
-
-kern_return_t
-thread_apc_clear(
- thread_act_t act,
- thread_apc_handler_t apc)
-{
- extern thread_apc_handler_t bsd_ast;
-
- assert(apc == bsd_ast);
- return (KERN_FAILURE);
-}
-
/*
* Activation control support routines internal to this file:
- */
-
-/*
- * act_execute_returnhandlers() - does just what the name says
*
- * This is called by system-dependent code when it detects that
- * thr_act->handlers is non-null while returning into user mode.
*/
-void
-act_execute_returnhandlers(void)
-{
- thread_act_t act = current_act();
-
- thread_ast_clear(act, AST_APC);
- spllo();
-
- for (;;) {
- ReturnHandler *rh;
- thread_t thread = act_lock_thread(act);
-
- (void)splsched();
- thread_lock(thread);
- rh = act->handlers;
- if (!rh) {
- thread_unlock(thread);
- spllo();
- act_unlock_thread(act);
- return;
- }
- act->handlers = rh->next;
- thread_unlock(thread);
- spllo();
- act_unlock_thread(act);
-
- /* Execute it */
- (*rh->handler)(rh, act);
- }
-}
/*
- * special_handler_continue
+ * thread_suspended
*
- * Continuation routine for the special handler blocks. It checks
+ * Continuation routine for thread suspension. 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).
+ * installs the AST_APC handler again.
*/
-void
-special_handler_continue(void)
+__attribute__((noreturn))
+static void
+thread_suspended(__unused void *parameter, wait_result_t result)
{
- thread_act_t self = current_act();
+ thread_t thread = current_thread();
- if (self->suspend_count > 0)
- install_special_handler(self);
- else {
- thread_t thread = self->thread;
- spl_t s = splsched();
+ thread_mtx_lock(thread);
- thread_lock(thread);
- if (thread->sched_mode & TH_MODE_ISDEPRESSED) {
- processor_t myprocessor = thread->last_processor;
+ if (result == THREAD_INTERRUPTED)
+ thread->suspend_parked = FALSE;
+ else
+ assert(thread->suspend_parked == FALSE);
- thread->sched_pri = DEPRESSPRI;
- myprocessor->current_pri = thread->sched_pri;
- thread->sched_mode &= ~TH_MODE_PREEMPT;
- }
- thread_unlock(thread);
- splx(s);
- }
+ if (thread->suspend_count > 0)
+ thread_set_apc_ast(thread);
+
+ thread_mtx_unlock(thread);
thread_exception_return();
/*NOTREACHED*/
}
/*
- * special_handler - handles suspension, termination. Called
- * with nothing locked. Returns (if it returns) the same way.
+ * thread_apc_ast - handles AST_APC and drives thread suspension and termination.
+ * Called with nothing locked. Returns (if it returns) the same way.
*/
void
-special_handler(
- ReturnHandler *rh,
- thread_act_t self)
+thread_apc_ast(thread_t thread)
{
- thread_t thread = act_lock_thread(self);
- spl_t s;
+ thread_mtx_lock(thread);
- assert(thread != THREAD_NULL);
+ assert(thread->suspend_parked == FALSE);
- s = splsched();
+ spl_t s = splsched();
thread_lock(thread);
- thread->state &= ~(TH_ABORT|TH_ABORT_SAFELY); /* clear any aborts */
+
+ /* 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 (!self->active) {
- act_unlock_thread(self);
+ if (!thread->active) {
+ /* Thread is ready to terminate, time to tear it down */
+ thread_mtx_unlock(thread);
+
thread_terminate_self();
/*NOTREACHED*/
}
- /*
- * If we're suspended, go to sleep and wait for someone to wake us up.
- */
- if (self->suspend_count > 0) {
- if (self->handlers == NULL) {
- assert_wait(&self->suspend_count, THREAD_ABORTSAFE);
- act_unlock_thread(self);
- thread_block(special_handler_continue);
- /*NOTREACHED*/
- }
-
- act_unlock_thread(self);
+ /* 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);
- special_handler_continue();
+ thread_block(thread_suspended);
/*NOTREACHED*/
}
- act_unlock_thread(self);
+ thread_mtx_unlock(thread);
}
-/*
- * Already locked: activation (shuttle frozen within)
- *
- * Mark an activation inactive, and prepare it to terminate
- * itself.
- */
-static void
-act_disable(
- 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);
+
+kern_return_t
+act_set_state(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t count)
{
- thr_act->active = 0;
+ if (thread == current_thread())
+ return (KERN_INVALID_ARGUMENT);
- /* 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_deallocate_locked(thr_act);
+ return (thread_set_state(thread, flavor, state, count));
+
}
-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);
-
-/*
- * 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 act,
- int flavor,
- thread_state_t state,
- int *pcount,
- void (*handler)(
- ReturnHandler *rh,
- thread_act_t act))
+act_set_state_from_user(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t count)
{
- GetSetState gss;
-
- /* 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 = act->handlers;
- act->handlers = &gss.rh;
-
- act_set_apc(act);
-
- assert(act->thread);
- assert(act != current_act());
+ if (thread == current_thread())
+ return (KERN_INVALID_ARGUMENT);
- for (;;) {
- wait_result_t result;
-
- if ( act->started &&
- act->thread->top_act == act )
- thread_wakeup_one(&act->suspend_count);
-
- /*
- * Wait must be interruptible to avoid deadlock (e.g.) with
- * task_suspend() when caller and target of get_set_state()
- * are in same task.
- */
- result = assert_wait(&gss, THREAD_ABORTSAFE);
- act_unlock_thread(act);
-
- if (result == THREAD_WAITING)
- result = thread_block(THREAD_CONTINUE_NULL);
-
- assert(result != THREAD_WAITING);
-
- if (gss.result != KERN_ABORTED) {
- assert(result != THREAD_INTERRUPTED);
- break;
- }
+ return (thread_set_state_from_user(thread, flavor, state, count));
+
+}
- /* JMM - What about other aborts (like BSD signals)? */
- if (current_act()->handlers)
- act_execute_returnhandlers();
+/* Prototype, see justification above */
+kern_return_t
+act_get_state(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t *count);
- act_lock_thread(act);
- }
+kern_return_t
+act_get_state(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t *count)
+{
+ if (thread == current_thread())
+ return (KERN_INVALID_ARGUMENT);
- return (gss.result);
+ return (thread_get_state(thread, flavor, state, count));
}
-void
-set_state_handler(ReturnHandler *rh, thread_act_t thr_act)
+kern_return_t
+act_get_state_to_user(
+ thread_t thread,
+ int flavor,
+ thread_state_t state,
+ mach_msg_type_number_t *count)
{
- GetSetState *gss = (GetSetState*)rh;
+ if (thread == current_thread())
+ return (KERN_INVALID_ARGUMENT);
- gss->result = machine_thread_set_state(thr_act, gss->flavor,
- gss->state, *gss->pcount);
- thread_wakeup((event_t)gss);
+ return (thread_get_state_to_user(thread, flavor, state, count));
}
-void
-get_state_handler(ReturnHandler *rh, thread_act_t thr_act)
+static void
+act_set_ast(
+ thread_t thread,
+ ast_t ast)
{
- GetSetState *gss = (GetSetState*)rh;
+ spl_t s = splsched();
- gss->result = machine_thread_get_state(thr_act, gss->flavor,
- gss->state,
- (mach_msg_type_number_t *) gss->pcount);
- thread_wakeup((event_t)gss);
-}
+ if (thread == current_thread()) {
+ thread_ast_set(thread, ast);
+ ast_propagate(thread);
+ } else {
+ processor_t processor;
-kern_return_t
-act_get_state_locked(thread_act_t thr_act, int flavor, thread_state_t state,
- mach_msg_type_number_t *pcount)
-{
- return(get_set_state(thr_act, flavor, state, (int*)pcount, get_state_handler));
-}
+ 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);
+ }
-kern_return_t
-act_set_state_locked(thread_act_t thr_act, int flavor, thread_state_t state,
- mach_msg_type_number_t count)
-{
- return(get_set_state(thr_act, flavor, state, (int*)&count, set_state_handler));
+ splx(s);
}
-kern_return_t
-act_set_state(thread_act_t thr_act, int flavor, thread_state_t state,
- mach_msg_type_number_t count)
+/*
+ * 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.
+ */
+static void
+act_set_ast_async(thread_t thread,
+ ast_t ast)
{
- if (thr_act == THR_ACT_NULL || thr_act == current_act())
- return(KERN_INVALID_ARGUMENT);
+ thread_ast_set(thread, ast);
- act_lock_thread(thr_act);
- return(act_set_state_locked(thr_act, flavor, state, count));
-
+ if (thread == current_thread()) {
+ spl_t s = splsched();
+ ast_propagate(thread);
+ splx(s);
+ }
}
-kern_return_t
-act_get_state(thread_act_t thr_act, int flavor, thread_state_t state,
- mach_msg_type_number_t *pcount)
+void
+act_set_astbsd(
+ thread_t thread)
{
- if (thr_act == THR_ACT_NULL || thr_act == current_act())
- return(KERN_INVALID_ARGUMENT);
-
- act_lock_thread(thr_act);
- return(act_get_state_locked(thr_act, flavor, state, pcount));
+ act_set_ast( thread, AST_BSD );
}
void
-act_set_astbsd(
- thread_act_t act)
+act_set_astkevent(thread_t thread, uint16_t bits)
{
- spl_t s = splsched();
-
- if (act == current_act()) {
- thread_ast_set(act, AST_BSD);
- ast_propagate(act->ast);
- }
- else {
- thread_t thread = act->thread;
- processor_t processor;
+ atomic_fetch_or(&thread->kevent_ast_bits, bits);
- thread_lock(thread);
- thread_ast_set(act, AST_BSD);
- 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);
+ /* kevent AST shouldn't send immediate IPIs */
+ act_set_ast_async(thread, AST_KEVENT);
}
void
-act_set_apc(
- thread_act_t act)
+act_set_kperf(
+ thread_t thread)
{
- spl_t s = splsched();
-
- if (act == current_act()) {
- thread_ast_set(act, AST_APC);
- ast_propagate(act->ast);
- }
- else {
- thread_t thread = act->thread;
- processor_t processor;
+ /* safety check */
+ if (thread != current_thread())
+ if( !ml_get_interrupts_enabled() )
+ panic("unsafe act_set_kperf operation");
- thread_lock(thread);
- thread_ast_set(act, AST_APC);
- 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);
+ act_set_ast( thread, AST_KPERF );
}
+#if CONFIG_MACF
void
-act_ulock_release_all(thread_act_t thr_act)
+act_set_astmacf(
+ thread_t thread)
{
- ulock_t ulock;
+ act_set_ast( thread, AST_MACF);
+}
+#endif
- 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);
- }
+void
+act_set_astledger(thread_t thread)
+{
+ act_set_ast(thread, AST_LEDGER);
}
/*
- * Provide routines (for export to other components) of things that
- * are implemented as macros insternally.
+ * 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.
*/
-thread_act_t
-thread_self(void)
+void
+act_set_astledger_async(thread_t thread)
{
- thread_act_t self = current_act_fast();
-
- act_reference(self);
- return self;
+ act_set_ast_async(thread, AST_LEDGER);
}
-thread_act_t
-mach_thread_self(void)
+void
+act_set_io_telemetry_ast(thread_t thread)
{
- thread_act_t self = current_act_fast();
-
- act_reference(self);
- return self;
+ act_set_ast(thread, AST_TELEMETRY_IO);
}
+
projects / apple / xnu.git / blobdiff