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authorRich Felker <dalias@aerifal.cx>2011-08-07 18:31:06 -0400
committerRich Felker <dalias@aerifal.cx>2011-08-07 18:31:06 -0400
commit140778582487fb082716eec74324d7b16beb2daf (patch)
tree27003268f6f6757d9a0b6f2b64185e8b8e241b2c /src/thread
parentcdfb725ca3e20e14c64ca8695496e430b89b3b2c (diff)
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condition variable signal/bcast need not wake unless there are waiters
Diffstat (limited to 'src/thread')
-rw-r--r--src/thread/pthread_cond_broadcast.c4
-rw-r--r--src/thread/pthread_cond_signal.c4
2 files changed, 4 insertions, 4 deletions
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;
 }