trap UB from attempts to join a detached thread

[musl] / src / thread / pthread_cond_signal.c

diff --git a/src/thread/pthread_cond_signal.c b/src/thread/pthread_cond_signal.c
index 574f5c7..119c00a 100644 (file)
--- a/src/thread/pthread_cond_signal.c
+++ b/src/thread/pthread_cond_signal.c
@@ -1,8 +1,12 @@
 #include "pthread_impl.h"
 
+int __private_cond_signal(pthread_cond_t *, int);
+
 int pthread_cond_signal(pthread_cond_t *c)
 {
-       c->_c_block = 0;
-       __wake(&c->_c_block, 1, 0);
+       if (!c->_c_shared) return __private_cond_signal(c, 1);
+       if (!c->_c_waiters) return 0;
+       a_inc(&c->_c_seq);
+       __wake(&c->_c_seq, 1, 0);
        return 0;
 }