From eded407e623eb37799e326389a5de8f38c335026 Mon Sep 17 00:00:00 2001
From: Bright Chen <chenguangmingfe@foxmail.com>
Date: Wed, 1 Nov 2023 00:52:07 +0800
Subject: [PATCH] usleep returns ESTOP when schedule timer failed

---
 src/bthread/task_group.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/bthread/task_group.cpp b/src/bthread/task_group.cpp
index cbae7c5bfa..0a785601e6 100644
--- a/src/bthread/task_group.cpp
+++ b/src/bthread/task_group.cpp
@@ -796,6 +796,11 @@ int TaskGroup::usleep(TaskGroup** pg, uint64_t timeout_us) {
     g->set_remained(_add_sleep_event, &e);
     sched(pg);
     g = *pg;
+    if (e.meta->current_sleep == 0 && !e.meta->interrupted) {
+        // Fail to `_add_sleep_event'.
+        errno = ESTOP;
+        return -1;
+    }
     e.meta->current_sleep = 0;
     if (e.meta->interrupted) {
         // Race with set and may consume multiple interruptions, which are OK.