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fix excessive/insufficient wakes in __vm_unlock 

there is no need to send a wake when the lock count does not hit zero,
but when it does, all waiters must be woken (since all with the same
sign are eligible to obtain the lock).
This commit is contained in:
Rich Felker 2011-09-28 19:45:37 -04:00
parent ede5ae7b0b
commit de543b05c8
1 changed files with 3 additions and 3 deletions
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6
src/thread/pthread_barrier_wait.c
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@ -13,9 +13,9 @@ void __vm_lock(int inc)
void __vm_unlock(void)
{
if (vmlock[0]>0) a_dec(vmlock);
else a_inc(vmlock);
if (vmlock[1]) __wake(vmlock, 1, 1);
int inc = vmlock[0]>0 ? -1 : 1;
if (a_fetch_add(vmlock, inc)==-inc && vmlock[1])
__wake(vmlock, -1, 1);
}
static int pshared_barrier_wait(pthread_barrier_t *b)