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condition variable signal/bcast need not wake unless there are waiters

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This commit is contained in:
Rich Felker 2011-08-07 18:31:06 -04:00
commit 1407785824
2 changed files with 4 additions and 4 deletions
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4
src/thread/pthread_cond_broadcast.c
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@ -2,7 +2,7 @@
int pthread_cond_broadcast(pthread_cond_t *c)
{
c->_c_block = 0;
__wake(&c->_c_block, -1, 0);
if (a_swap(&c->_c_block, 0))
__wake(&c->_c_block, -1, 0);
return 0;
}

4
src/thread/pthread_cond_signal.c
View file

@ -2,7 +2,7 @@
int pthread_cond_signal(pthread_cond_t *c)
{
c->_c_block = 0;
__wake(&c->_c_block, 1, 0);
if (a_swap(&c->_c_block, 0));
__wake(&c->_c_block, 1, 0);
return 0;
}