Signal condition variables with the mutex held. Destroy condition variables

Kristján Valur Jónsson · Kristján Valur Jónsson · commit 187aa545165d · 2012-06-05T22:17:42.000Z
before their mutexes.
diff --git a/Python/ceval_gil.h b/Python/ceval_gil.h
@@ -313,13 +313,14 @@ static void create_gil(void)
 
 static void destroy_gil(void)
 {
-    MUTEX_FINI(gil_mutex);
-#ifdef FORCE_SWITCHING
-    MUTEX_FINI(switch_mutex);
-#endif
+    /* some pthread-like implementations tie the mutex to the cond
+     * and must have the cond destroyed first.
+     */
     COND_FINI(gil_cond);
+    MUTEX_FINI(gil_mutex);
 #ifdef FORCE_SWITCHING
     COND_FINI(switch_cond);
+    MUTEX_FINI(switch_mutex);
 #endif
     _Py_atomic_store_explicit(&gil_locked, -1, _Py_memory_order_release);
     _Py_ANNOTATE_RWLOCK_DESTROY(&gil_locked);
diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
@@ -443,12 +443,15 @@ PyThread_free_lock(PyThread_type_lock lock)
 
     dprintf(("PyThread_free_lock(%p) called\n", lock));
 
-    status = pthread_mutex_destroy( &thelock->mut );
-    CHECK_STATUS("pthread_mutex_destroy");
-
+    /* some pthread-like implementations tie the mutex to the cond
+     * and must have the cond destroyed first.
+     */
     status = pthread_cond_destroy( &thelock->lock_released );
     CHECK_STATUS("pthread_cond_destroy");
 
+    status = pthread_mutex_destroy( &thelock->mut );
+    CHECK_STATUS("pthread_mutex_destroy");
+
     free((void *)thelock);
 }
 
@@ -531,12 +534,12 @@ PyThread_release_lock(PyThread_type_lock lock)
 
     thelock->locked = 0;
 
-    status = pthread_mutex_unlock( &thelock->mut );
-    CHECK_STATUS("pthread_mutex_unlock[3]");
-
     /* wake up someone (anyone, if any) waiting on the lock */
     status = pthread_cond_signal( &thelock->lock_released );
     CHECK_STATUS("pthread_cond_signal");
+
+    status = pthread_mutex_unlock( &thelock->mut );
+    CHECK_STATUS("pthread_mutex_unlock[3]");
 }
 
 #endif /* USE_SEMAPHORES */
