next step making barrier self-sync'd destruction safe

[musl] / src / thread / pthread_barrier_destroy.c

diff --git a/src/thread/pthread_barrier_destroy.c b/src/thread/pthread_barrier_destroy.c
index 3ebc2b3..e0da197 100644 (file)
--- a/src/thread/pthread_barrier_destroy.c
+++ b/src/thread/pthread_barrier_destroy.c
@@ -5,8 +5,12 @@ void __vm_lock(int), __vm_unlock(void);
 int pthread_barrier_destroy(pthread_barrier_t *b)
 {
        if (b->_b_limit < 0) {
-               int seq = b->_b_seq;
-               if (seq & 1) __wait(&b->_b_seq, 0, seq, 0);
+               if (b->_b_lock) {
+                       int v;
+                       a_or(&b->_b_lock, INT_MIN);
+                       while ((v = b->_b_lock) & INT_MAX)
+                               __wait(&b->_b_lock, 0, v, 0);
+               }
                __vm_lock(-1);
                __vm_unlock();
        }