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Fix a race condition which could result in profprocs being decremented

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more than once if stopprofclock is called multiple times on the same
process.
This commit is contained in:
cperciva 2004-05-03 00:48:11 +00:00
parent bf4defd302
commit 0dfa816e55
1 changed files with 2 additions and 0 deletions
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2
sys/kern/kern_clock.c
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@ -353,6 +353,8 @@ stopprofclock(p)
"stopprof", 0); "stopprof", 0);
p->p_flag &= ~P_STOPPROF; p->p_flag &= ~P_STOPPROF;
} }
if ((p->p_flag & P_PROFIL) == 0)
return;
mtx_lock_spin(&sched_lock); mtx_lock_spin(&sched_lock);
p->p_flag &= ~P_PROFIL; p->p_flag &= ~P_PROFIL;
if (--profprocs == 0) if (--profprocs == 0)