/* Must be called with nklock locked, interrupts off. thread must be
* runnable. */
void xnsched_migrate(struct xnthread *thread, struct xnsched *sched)
{
struct xnsched_class *sched_class = thread->sched_class;
if (xnthread_test_state(thread, XNREADY)) {
xnsched_dequeue(thread);
xnthread_clear_state(thread, XNREADY);
}
if (sched_class->sched_migrate)
sched_class->sched_migrate(thread, sched);
/*
* WARNING: the scheduling class may have just changed as a
* result of calling the per-class migration hook.
*/
xnsched_set_resched(thread->sched);
thread->sched = sched;
#ifdef CONFIG_XENO_HW_UNLOCKED_SWITCH
/*
* Mark the thread in flight, xnsched_finish_unlocked_switch()
* will put the thread on the remote runqueue.
*/
xnthread_set_state(thread, XNMIGRATE);
#else /* !CONFIG_XENO_HW_UNLOCKED_SWITCH */
/* Move thread to the remote runnable queue. */
xnsched_putback(thread);
#endif /* !CONFIG_XENO_HW_UNLOCKED_SWITCH */
}
/*
* Must be called with nklock locked, interrupts off. thread must be
* runnable.
*/
void xnsched_migrate(struct xnthread *thread, struct xnsched *sched)
{
migrate_thread(thread, sched);
#ifdef CONFIG_XENO_ARCH_UNLOCKED_SWITCH
/*
* Mark the thread in flight, xnsched_finish_unlocked_switch()
* will put the thread on the remote runqueue.
*/
xnthread_set_state(thread, XNMIGRATE);
#else /* !CONFIG_XENO_ARCH_UNLOCKED_SWITCH */
/* Move thread to the remote runnable queue. */
xnsched_putback(thread);
#endif /* !CONFIG_XENO_ARCH_UNLOCKED_SWITCH */
}
struct xnsched *xnsched_finish_unlocked_switch(struct xnsched *sched)
{
struct xnthread *last;
spl_t s;
xnlock_get_irqsave(&nklock, s);
#ifdef CONFIG_SMP
/* If current thread migrated while suspended */
sched = xnsched_current();
#endif /* CONFIG_SMP */
last = sched->last;
sched->status &= ~XNINSW;
/* Detect a thread which called xnthread_migrate() */
if (last->sched != sched) {
xnsched_putback(last);
xnthread_clear_state(last, XNMIGRATE);
}
return sched;
}
struct xnsched *xnsched_finish_unlocked_switch(struct xnsched *sched)
{
struct xnthread *last;
spl_t s;
xnlock_get_irqsave(&nklock, s);
#ifdef CONFIG_SMP
/* If current thread migrated while suspended */
sched = xnpod_current_sched();
#endif /* CONFIG_SMP */
last = sched->last;
__clrbits(sched->status, XNSWLOCK);
/* Detect a thread which called xnpod_migrate_thread */
if (last->sched != sched) {
xnsched_putback(last);
xnthread_clear_state(last, XNMIGRATE);
}
if (xnthread_test_state(last, XNZOMBIE)) {
/*
* There are two cases where sched->last has the zombie
* bit:
* - either it had it before the context switch, the hooks
* have been executed and sched->zombie is last;
* - or it has been killed while the nklocked was unlocked
* during the context switch, in which case we must run the
* hooks, and we do it now.
*/
if (sched->zombie != last)
xnsched_zombie_hooks(last);
}
return sched;
}
