1 files changed, 3 insertions, 2 deletions
diff --git a/Python/thread_nt.h b/Python/thread_nt.h
index 21ef555..fdb192b 100644
--- a/Python/thread_nt.h
+++ b/Python/thread_nt.h
@@ -104,8 +104,9 @@ LeaveNonRecursiveMutex(PNRMUTEX mutex)
     if (PyMUTEX_LOCK(&mutex->cs))
         return FALSE;
     mutex->locked = 0;
-    result = PyCOND_SIGNAL(&mutex->cv);
-    result &= PyMUTEX_UNLOCK(&mutex->cs);
+    /* condvar APIs return 0 on success. We need to return TRUE on success. */
+    result = !PyCOND_SIGNAL(&mutex->cv);
+    PyMUTEX_UNLOCK(&mutex->cs);
     return result;
 }