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Fox a LOR of sleep and sched_lock by using a timeout wait

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when process reaches maximum number of threads.

MFC after: 3 days
This commit is contained in:
davidxu 2005-09-30 06:09:41 +00:00
parent 1a601e1eb1
commit a1fdec3aa1
2 changed files with 1 additions and 8 deletions
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2
sys/kern/kern_kse.c
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@ -1341,7 +1341,7 @@ thread_userret(struct thread *td, struct trapframe *frame)
break;
mtx_unlock_spin(&sched_lock);
if (msleep(&p->p_numthreads, &p->p_mtx, PPAUSE|PCATCH,
"maxthreads", 0)) {
"maxthreads", hz/10) != EWOULDBLOCK) {
mtx_lock_spin(&sched_lock);
break;
} else {

7
sys/kern/kern_thread.c
View File

@ -492,13 +492,6 @@ thread_exit(void)
/* XXX first arg not used in 4BSD or ULE */
sched_exit_thread(FIRST_THREAD_IN_PROC(p), td);
/*
* as we are exiting there is room for another
* to be created.
*/
if (p->p_maxthrwaits)
wakeup(&p->p_numthreads);
/*
* The test below is NOT true if we are the
* sole exiting thread. P_STOPPED_SNGL is unset