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Tweak locking in the PS_XCPU handler to hold the sched_lock while reading

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p_runtime.
This commit is contained in:
John Baldwin 2003-04-17 22:33:04 +00:00
parent b68e08498f
commit f5d5cb3c7c
1 changed files with 5 additions and 4 deletions
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9
sys/kern/subr_trap.c
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@ -222,14 +222,15 @@ ast(struct trapframe *framep)
if (sflag & PS_XCPU) {
PROC_LOCK(p);
rlim = &p->p_rlimit[RLIMIT_CPU];
if (p->p_runtime.sec >= rlim->rlim_max)
mtx_lock_spin(&sched_lock);
if (p->p_runtime.sec >= rlim->rlim_max) {
mtx_unlock_spin(&sched_lock);
killproc(p, "exceeded maximum CPU limit");
else {
psignal(p, SIGXCPU);
mtx_lock_spin(&sched_lock);
} else {
if (p->p_cpulimit < rlim->rlim_max)
p->p_cpulimit += 5;
mtx_unlock_spin(&sched_lock);
psignal(p, SIGXCPU);
}
PROC_UNLOCK(p);
}