Index: SWIG/_threads.i
===================================================================
--- SWIG/_threads.i	(revision 686)
+++ SWIG/_threads.i	(working copy)
@@ -14,7 +14,7 @@
 void threading_locking_callback(int mode, int type, const char *file, int line) {
 #ifdef THREADING
         if (mode & CRYPTO_LOCK) {
-                PyThread_acquire_lock(lock_cs[type], 0);
+                PyThread_acquire_lock(lock_cs[type], WAIT_LOCK);
                 lock_count[type]++;
         } else {
                 PyThread_release_lock(lock_cs[type]);