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Added functions to pin a thread to the current CPU (i.e. it will only be

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scheduled on that CPU) and to avoid unscheduling it.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27974 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2008-10-11 18:11:12 +00:00
parent c4c2a6192d
commit 6503e5d9c6
4 changed files with 48 additions and 3 deletions
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28
headers/private/kernel/thread.h
View File

@ -205,4 +205,32 @@ thread_interrupt(struct thread* thread, bool kill)
}
static inline void
thread_pin_to_current_cpu(struct thread* thread)
{
thread->pinned_to_cpu++;
}
static inline void
thread_unpin_from_current_cpu(struct thread* thread)
{
thread->pinned_to_cpu--;
}
static inline void
thread_disable_scheduling(struct thread* thread)
{
thread->keep_scheduled++;
}
static inline void
thread_enable_scheduling(struct thread* thread)
{
thread->keep_scheduled--;
}
#endif /* _THREAD_H */

3
headers/private/kernel/thread_types.h
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@ -230,6 +230,9 @@ struct thread {
int32 state;
int32 next_state;
struct cpu_ent *cpu;
struct cpu_ent *previous_cpu;
int32 pinned_to_cpu;
int32 keep_scheduled;
sigset_t sig_pending;
sigset_t sig_block_mask;

17
src/system/kernel/scheduler.cpp
View File

@ -543,7 +543,7 @@ context_switch(struct thread *fromThread, struct thread *toThread)
if ((fromThread->flags & THREAD_FLAGS_DEBUGGER_INSTALLED) != 0)
user_debug_thread_unscheduled(fromThread);
toThread->cpu = fromThread->cpu;
toThread->previous_cpu = toThread->cpu = fromThread->cpu;
fromThread->cpu = NULL;
arch_thread_set_current_thread(toThread);
@ -560,8 +560,11 @@ context_switch(struct thread *fromThread, struct thread *toThread)
static int32
reschedule_event(timer *unused)
{
// this function is called as a result of the timer event set by the scheduler
// returning this causes a reschedule on the timer event
if (thread_get_current_thread()->keep_scheduled > 0)
return B_HANDLED_INTERRUPT;
// this function is called as a result of the timer event set by the
// scheduler returning this causes a reschedule on the timer event
thread_get_current_thread()->cpu->preempted = 1;
return B_INVOKE_SCHEDULER;
}
@ -617,6 +620,14 @@ scheduler_reschedule(void)
}
#endif
// skip thread, if it doesn't want to run on this CPU
if (nextThread->pinned_to_cpu > 0
&& nextThread->previous_cpu != oldThread->cpu) {
prevThread = nextThread;
nextThread = nextThread->queue_next;
continue;
}
// always extract real time threads
if (nextThread->priority >= B_FIRST_REAL_TIME_PRIORITY)
break;

3
src/system/kernel/thread.cpp
View File

@ -223,6 +223,9 @@ create_thread_struct(struct thread *inthread, const char *name,
thread->id = threadID >= 0 ? threadID : allocate_thread_id();
thread->team = NULL;
thread->cpu = cpu;
thread->previous_cpu = NULL;
thread->pinned_to_cpu = 0;
thread->keep_scheduled = 0;
thread->fault_handler = 0;
thread->page_faults_allowed = 1;
thread->kernel_stack_area = -1;