113 static PyThread_type_lock import_lock = NULL;  variable
123     if (import_lock == NULL) {  in _PyImport_AcquireLock()
124         import_lock = PyThread_allocate_lock();  in _PyImport_AcquireLock()
125         if (import_lock == NULL)  in _PyImport_AcquireLock()
133         !PyThread_acquire_lock(import_lock, 0))  in _PyImport_AcquireLock()
136         PyThread_acquire_lock(import_lock, WAIT_LOCK);  in _PyImport_AcquireLock()
148     if (me == PYTHREAD_INVALID_THREAD_ID || import_lock == NULL)  in _PyImport_ReleaseLock()
156         PyThread_release_lock(import_lock);  in _PyImport_ReleaseLock()
169     if (import_lock != NULL) {  in _PyImport_ReInitLock()
170         if (_PyThread_at_fork_reinit(&import_lock) < 0) {  in _PyImport_ReInitLock()
178         PyThread_acquire_lock(import_lock, WAIT_LOCK);  in _PyImport_ReInitLock()
245     if (import_lock != NULL) {  in _PyImport_Fini()
246         PyThread_free_lock(import_lock);  in _PyImport_Fini()
247         import_lock = NULL;  in _PyImport_Fini()