/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
#include <ipc/ipc_port.h>
#include <ipc/ipc_space.h>
#include <kern/counters.h>
-#include <kern/etap_macros.h>
#include <kern/ipc_kobject.h>
#include <kern/processor.h>
#include <kern/sched.h>
#include <kern/spl.h>
#include <kern/task.h>
#include <kern/thread.h>
-#include <kern/ast.h>
#include <mach/policy.h>
#include <kern/syscall_subr.h>
#include <mach/mach_host_server.h>
#include <mach/mach_syscalls.h>
-#include <kern/mk_sp.h>
-
/*
* swtch and swtch_pri both attempt to context switch (logic in
* thread_block no-ops the context switch if nothing would happen).
* lock and then be a good citizen and really suspend.
*/
-void
+static void
swtch_continue(void)
{
register processor_t myprocessor;
boolean_t result;
- mp_disable_preemption();
+ disable_preemption();
myprocessor = current_processor();
result = myprocessor->runq.count > 0 ||
myprocessor->processor_set->runq.count > 0;
- mp_enable_preemption();
+ enable_preemption();
thread_syscall_return(result);
/*NOTREACHED*/
}
boolean_t
-swtch(void)
+swtch(
+ __unused struct swtch_args *args)
{
register processor_t myprocessor;
boolean_t result;
- mp_disable_preemption();
+ disable_preemption();
myprocessor = current_processor();
if ( myprocessor->runq.count == 0 &&
myprocessor->processor_set->runq.count == 0 ) {
return (FALSE);
}
- mp_enable_preemption();
+ enable_preemption();
counter(c_swtch_block++);
- thread_block_reason(swtch_continue, AST_YIELD);
+ thread_block_reason((thread_continue_t)swtch_continue, NULL, AST_YIELD);
- mp_disable_preemption();
+ disable_preemption();
myprocessor = current_processor();
result = myprocessor->runq.count > 0 ||
myprocessor->processor_set->runq.count > 0;
- mp_enable_preemption();
+ enable_preemption();
return (result);
}
-void
+static void
swtch_pri_continue(void)
{
register processor_t myprocessor;
boolean_t result;
- _mk_sp_thread_depress_abort(current_thread(), FALSE);
+ thread_depress_abort_internal(current_thread());
- mp_disable_preemption();
+ disable_preemption();
myprocessor = current_processor();
result = myprocessor->runq.count > 0 ||
myprocessor->processor_set->runq.count > 0;
boolean_t
swtch_pri(
- int pri)
+__unused struct swtch_pri_args *args)
{
register processor_t myprocessor;
boolean_t result;
- mp_disable_preemption();
+ disable_preemption();
myprocessor = current_processor();
if ( myprocessor->runq.count == 0 &&
myprocessor->processor_set->runq.count == 0 ) {
return (FALSE);
}
- mp_enable_preemption();
+ enable_preemption();
counter(c_swtch_pri_block++);
- _mk_sp_thread_depress_abstime(std_quantum);
+ thread_depress_abstime(std_quantum);
- thread_block_reason(swtch_pri_continue, AST_YIELD);
+ thread_block_reason((thread_continue_t)swtch_pri_continue, NULL, AST_YIELD);
- _mk_sp_thread_depress_abort(current_thread(), FALSE);
+ thread_depress_abort_internal(current_thread());
- mp_disable_preemption();
+ disable_preemption();
myprocessor = current_processor();
result = myprocessor->runq.count > 0 ||
myprocessor->processor_set->runq.count > 0;
- mp_enable_preemption();
+ enable_preemption();
return (result);
}
+static void
+thread_switch_continue(void)
+{
+ register thread_t self = current_thread();
+ int option = self->saved.swtch.option;
+
+ if (option == SWITCH_OPTION_DEPRESS)
+ thread_depress_abort_internal(self);
+
+ thread_syscall_return(KERN_SUCCESS);
+ /*NOTREACHED*/
+}
+
/*
* thread_switch:
*
*/
kern_return_t
thread_switch(
- mach_port_name_t thread_name,
- int option,
- mach_msg_timeout_t option_time)
+ struct thread_switch_args *args)
{
- register thread_t self = current_thread();
- register thread_act_t hint_act = THR_ACT_NULL;
+ register thread_t thread, self = current_thread();
+ mach_port_name_t thread_name = args->thread_name;
+ int option = args->option;
+ mach_msg_timeout_t option_time = args->option_time;
/*
* Process option.
return (KERN_INVALID_ARGUMENT);
}
+ /*
+ * Translate the port name if supplied.
+ */
if (thread_name != MACH_PORT_NULL) {
ipc_port_t port;
- if (ipc_port_translate_send(self->top_act->task->itk_space,
+ if (ipc_port_translate_send(self->task->itk_space,
thread_name, &port) == KERN_SUCCESS) {
ip_reference(port);
ip_unlock(port);
- hint_act = convert_port_to_act(port);
+ thread = convert_port_to_thread(port);
ipc_port_release(port);
+
+ if (thread == self) {
+ thread_deallocate_internal(thread);
+ thread = THREAD_NULL;
+ }
}
+ else
+ thread = THREAD_NULL;
}
+ else
+ thread = THREAD_NULL;
+
+ /*
+ * Try to handoff if supplied.
+ */
+ if (thread != THREAD_NULL) {
+ processor_t processor;
+ spl_t s;
+
+ s = splsched();
+ thread_lock(thread);
+
+ /*
+ * Check if the thread is in the right pset,
+ * is not bound to a different processor,
+ * and that realtime is not involved.
+ *
+ * Next, pull it off its run queue. If it
+ * doesn't come, it's not eligible.
+ */
+ processor = current_processor();
+ if (processor->current_pri < BASEPRI_RTQUEUES &&
+ thread->sched_pri < BASEPRI_RTQUEUES &&
+ thread->processor_set == processor->processor_set &&
+ (thread->bound_processor == PROCESSOR_NULL ||
+ thread->bound_processor == processor) &&
+ run_queue_remove(thread) != RUN_QUEUE_NULL ) {
+ /*
+ * Hah, got it!!
+ */
+ thread_unlock(thread);
+
+ thread_deallocate_internal(thread);
+
+ if (option == SWITCH_OPTION_WAIT)
+ assert_wait_timeout((event_t)assert_wait_timeout, THREAD_ABORTSAFE,
+ option_time, 1000*NSEC_PER_USEC);
+ else
+ if (option == SWITCH_OPTION_DEPRESS)
+ thread_depress_ms(option_time);
+
+ self->saved.swtch.option = option;
+
+ thread_run(self, (thread_continue_t)thread_switch_continue, NULL, thread);
+ /* NOTREACHED */
+ }
+
+ thread_unlock(thread);
+ splx(s);
+
+ thread_deallocate(thread);
+ }
+
+ if (option == SWITCH_OPTION_WAIT)
+ assert_wait_timeout((event_t)assert_wait_timeout, THREAD_ABORTSAFE, option_time, 1000*NSEC_PER_USEC);
+ else
+ if (option == SWITCH_OPTION_DEPRESS)
+ thread_depress_ms(option_time);
+
+ self->saved.swtch.option = option;
+
+ thread_block_reason((thread_continue_t)thread_switch_continue, NULL, AST_YIELD);
+
+ if (option == SWITCH_OPTION_DEPRESS)
+ thread_depress_abort_internal(self);
+
+ return (KERN_SUCCESS);
+}
- return _mk_sp_thread_switch(hint_act, option, option_time);
+/*
+ * Depress thread's priority to lowest possible for the specified interval,
+ * with a value of zero resulting in no timeout being scheduled.
+ */
+void
+thread_depress_abstime(
+ uint64_t interval)
+{
+ register thread_t self = current_thread();
+ uint64_t deadline;
+ spl_t s;
+
+ s = splsched();
+ thread_lock(self);
+ if (!(self->sched_mode & TH_MODE_ISDEPRESSED)) {
+ processor_t myprocessor = self->last_processor;
+
+ self->sched_pri = DEPRESSPRI;
+ myprocessor->current_pri = self->sched_pri;
+ self->sched_mode &= ~TH_MODE_PREEMPT;
+ self->sched_mode |= TH_MODE_DEPRESS;
+
+ if (interval != 0) {
+ clock_absolutetime_interval_to_deadline(interval, &deadline);
+ if (!timer_call_enter(&self->depress_timer, deadline))
+ self->depress_timer_active++;
+ }
+ }
+ thread_unlock(self);
+ splx(s);
+}
+
+void
+thread_depress_ms(
+ mach_msg_timeout_t interval)
+{
+ uint64_t abstime;
+
+ clock_interval_to_absolutetime_interval(
+ interval, 1000*NSEC_PER_USEC, &abstime);
+ thread_depress_abstime(abstime);
+}
+
+/*
+ * Priority depression expiration.
+ */
+void
+thread_depress_expire(
+ void *p0,
+ __unused void *p1)
+{
+ thread_t thread = p0;
+ spl_t s;
+
+ s = splsched();
+ thread_lock(thread);
+ if (--thread->depress_timer_active == 0) {
+ thread->sched_mode &= ~TH_MODE_ISDEPRESSED;
+ compute_priority(thread, FALSE);
+ }
+ thread_unlock(thread);
+ splx(s);
+}
+
+/*
+ * Prematurely abort priority depression if there is one.
+ */
+kern_return_t
+thread_depress_abort_internal(
+ thread_t thread)
+{
+ kern_return_t result = KERN_NOT_DEPRESSED;
+ spl_t s;
+
+ s = splsched();
+ thread_lock(thread);
+ if (!(thread->sched_mode & TH_MODE_POLLDEPRESS)) {
+ if (thread->sched_mode & TH_MODE_ISDEPRESSED) {
+ thread->sched_mode &= ~TH_MODE_ISDEPRESSED;
+ compute_priority(thread, FALSE);
+ result = KERN_SUCCESS;
+ }
+
+ if (timer_call_cancel(&thread->depress_timer))
+ thread->depress_timer_active--;
+ }
+ thread_unlock(thread);
+ splx(s);
+
+ return (result);
+}
+
+void
+thread_poll_yield(
+ thread_t self)
+{
+ spl_t s;
+
+ assert(self == current_thread());
+
+ s = splsched();
+ if (!(self->sched_mode & (TH_MODE_REALTIME|TH_MODE_TIMESHARE))) {
+ uint64_t total_computation, abstime;
+
+ abstime = mach_absolute_time();
+ total_computation = abstime - self->computation_epoch;
+ total_computation += self->computation_metered;
+ if (total_computation >= max_poll_computation) {
+ processor_t myprocessor = current_processor();
+ ast_t preempt;
+
+ thread_lock(self);
+ if (!(self->sched_mode & TH_MODE_ISDEPRESSED)) {
+ self->sched_pri = DEPRESSPRI;
+ myprocessor->current_pri = self->sched_pri;
+ self->sched_mode &= ~TH_MODE_PREEMPT;
+ }
+ self->computation_epoch = abstime;
+ self->computation_metered = 0;
+ self->sched_mode |= TH_MODE_POLLDEPRESS;
+
+ abstime += (total_computation >> sched_poll_yield_shift);
+ if (!timer_call_enter(&self->depress_timer, abstime))
+ self->depress_timer_active++;
+ thread_unlock(self);
+
+ if ((preempt = csw_check(self, myprocessor)) != AST_NONE)
+ ast_on(preempt);
+ }
+ }
+ splx(s);
}
projects / apple / xnu.git / blobdiff