Ticket #4064: pthread_cond.c.alt_2.diff

pthread_cond.c

@@ -82 +82 @@
         // Note, this is thread-safe, since another thread would be required to
         // hold the same mutex.
         sem_id sem = create_sem(0, "pthread_cond");
-        if (cond->sem < 0)
+        if (sem < 0)
             return EAGAIN;
-        cond->sem = sem;
+
+        if (atomic_test_and_set((vint32*)&cond->sem, sem, -42) != -42)
+            delete_sem(sem);
     }
 
     if (cond->mutex && cond->mutex != mutex)