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Code Issues Releases Activity

Push down sched_lock in psignal(). sched_lock was being held across

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recursive calls into psignal() as well as calls to signotify(),
forward_signal(), etc.
This commit is contained in:
John Baldwin 2001-01-01 02:31:08 +00:00
parent 30055cc993
commit 4bfba0cf19
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=70552
1 changed files with 21 additions and 4 deletions
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25
sys/kern/kern_sig.c
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@ -1137,8 +1137,10 @@ psignal(p, sig)
* asleep, we are finished; the process should not
* be awakened.
*/
mtx_exit(&sched_lock, MTX_SPIN);
if ((prop & SA_CONT) && action == SIG_DFL) {
SIGDELSET(p->p_siglist, sig);
mtx_enter(&sched_lock, MTX_SPIN);
goto out;
}
/*
@ -1148,8 +1150,10 @@ psignal(p, sig)
* cause the process to run.
*/
if (prop & SA_STOP) {
if (action != SIG_DFL)
if (action != SIG_DFL) {
mtx_enter(&sched_lock, MTX_SPIN);
goto runfast;
}
/*
* If a child holding parent blocked,
* stopping could cause deadlock.
@ -1163,9 +1167,12 @@ psignal(p, sig)
psignal(p->p_pptr, SIGCHLD);
stop(p);
PROCTREE_LOCK(PT_RELEASE);
mtx_enter(&sched_lock, MTX_SPIN);
goto out;
} else
} else {
mtx_enter(&sched_lock, MTX_SPIN);
goto runfast;
}
/*NOTREACHED*/
case SSTOP:
@ -1182,6 +1189,7 @@ psignal(p, sig)
if (sig == SIGKILL)
goto runfast;
mtx_exit(&sched_lock, MTX_SPIN);
if (prop & SA_CONT) {
/*
* If SIGCONT is default (or ignored), we continue the
@ -1195,6 +1203,7 @@ psignal(p, sig)
*/
if (action == SIG_DFL)
SIGDELSET(p->p_siglist, sig);
mtx_enter(&sched_lock, MTX_SPIN);
if (action == SIG_CATCH)
goto runfast;
if (p->p_wchan == 0)
@ -1209,6 +1218,7 @@ psignal(p, sig)
* (If we did the shell could get confused.)
*/
SIGDELSET(p->p_siglist, sig);
mtx_enter(&sched_lock, MTX_SPIN);
goto out;
}
@ -1218,6 +1228,7 @@ psignal(p, sig)
* runnable and can look at the signal. But don't make
* the process runnable, leave it stopped.
*/
mtx_enter(&sched_lock, MTX_SPIN);
if (p->p_wchan && p->p_flag & P_SINTR)
unsleep(p);
goto out;
@ -1228,11 +1239,17 @@ psignal(p, sig)
* other than kicking ourselves if we are running.
* It will either never be noticed, or noticed very soon.
*/
if (p == curproc)
if (p == curproc) {
mtx_exit(&sched_lock, MTX_SPIN);
signotify(p);
mtx_enter(&sched_lock, MTX_SPIN);
}
#ifdef SMP
else if (p->p_stat == SRUN)
else if (p->p_stat == SRUN) {
mtx_exit(&sched_lock, MTX_SPIN);
forward_signal(p);
mtx_enter(&sched_lock, MTX_SPIN);
}
#endif
goto out;
}