From 140778582487fb082716eec74324d7b16beb2daf Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Sun, 7 Aug 2011 18:31:06 -0400 Subject: condition variable signal/bcast need not wake unless there are waiters --- src/thread/pthread_cond_broadcast.c | 4 ++-- src/thread/pthread_cond_signal.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) (limited to 'src/thread') diff --git a/src/thread/pthread_cond_broadcast.c b/src/thread/pthread_cond_broadcast.c index 1d378c0b..30f7f6df 100644 --- a/src/thread/pthread_cond_broadcast.c +++ b/src/thread/pthread_cond_broadcast.c @@ -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; } diff --git a/src/thread/pthread_cond_signal.c b/src/thread/pthread_cond_signal.c index 574f5c79..a0211287 100644 --- a/src/thread/pthread_cond_signal.c +++ b/src/thread/pthread_cond_signal.c @@ -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; } -- cgit v1.2.1