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-rw-r--r--py/modthread.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/py/modthread.c b/py/modthread.c
index d0e71dad3b..1d76027893 100644
--- a/py/modthread.c
+++ b/py/modthread.c
@@ -84,7 +84,9 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(thread_lock_acquire_obj, 1, 3, thread
STATIC mp_obj_t thread_lock_release(mp_obj_t self_in) {
mp_obj_thread_lock_t *self = MP_OBJ_TO_PTR(self_in);
- // TODO check if already unlocked
+ if (!self->locked) {
+ mp_raise_msg(&mp_type_RuntimeError, NULL);
+ }
self->locked = false;
MP_THREAD_GIL_EXIT();
mp_thread_mutex_unlock(&self->mutex);