Fix Mutex#unlock with a scheduler and thread contention

* It would hit "[BUG] unexpected THREAD_STOPPED" before.

1 files changed, 13 insertions, 13 deletions

diff --git a/thread_sync.c b/thread_sync.c
index 741bff6160..10ff9c49b1 100644
--- a/thread_sync.c
+++ b/thread_sync.c
@@ -402,20 +402,20 @@ rb_mutex_unlock_th(rb_mutex_t *mutex, rb_thread_t *th, rb_fiber_t *fiber)
 
             if (cur->th->scheduler != Qnil) {
                 rb_scheduler_unblock(cur->th->scheduler, cur->self, rb_fiberptr_self(cur->fiber));
+            } else {
+                switch (cur->th->status) {
+                  case THREAD_RUNNABLE: /* from someone else calling Thread#run */
+                  case THREAD_STOPPED_FOREVER: /* likely (rb_mutex_lock) */
+                    rb_threadptr_interrupt(cur->th);
+                    goto found;
+                  case THREAD_STOPPED: /* probably impossible */
+                    rb_bug("unexpected THREAD_STOPPED");
+                  case THREAD_KILLED:
+                    /* not sure about this, possible in exit GC? */
+                    rb_bug("unexpected THREAD_KILLED");
+                    continue;
+                }
             }
-
-	    switch (cur->th->status) {
-	      case THREAD_RUNNABLE: /* from someone else calling Thread#run */
-	      case THREAD_STOPPED_FOREVER: /* likely (rb_mutex_lock) */
-		rb_threadptr_interrupt(cur->th);
-		goto found;
-	      case THREAD_STOPPED: /* probably impossible */
-		rb_bug("unexpected THREAD_STOPPED");
-	      case THREAD_KILLED:
-                /* not sure about this, possible in exit GC? */
-		rb_bug("unexpected THREAD_KILLED");
-		continue;
-	    }
 	}
       found:
 	while (*th_mutex != mutex) {