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

Rich Felker 13 年之前
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1407785824
共有 2 個文件被更改,包括 4 次插入4 次删除
  1. 2 2
      src/thread/pthread_cond_broadcast.c
  2. 2 2
      src/thread/pthread_cond_signal.c

+ 2 - 2
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;
 }

+ 2 - 2
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;
 }