From 730dc9d2f928c327f14f9f6db0a0f3e5de92e677 Mon Sep 17 00:00:00 2001
From: Bob Chen <beef9999@qq.com>
Date: Mon, 29 Apr 2024 16:54:32 +0800
Subject: [PATCH] revert epoll_wait wait 0 (#472)

---
 io/epoll.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/io/epoll.cpp b/io/epoll.cpp
index 44296fed..e6a93dca 100644
--- a/io/epoll.cpp
+++ b/io/epoll.cpp
@@ -203,8 +203,12 @@ ok:     entry.interests |= eint;
     int do_epoll_wait(uint64_t timeout) {
         assert(_events_remain == 0);
         uint8_t cool_down_ms = 1;
-        // The granularity of epoll_wait is milliseconds, but epoll_wait 0 finishes in microseconds
-        timeout /= 1000;
+        // since timeout may less than 1ms
+        // in such condition, timeout_ms should be at least 1
+        // or it may call epoll_wait without any idle
+        timeout = (timeout && timeout < 1024) ? 1 : timeout / 1024;
+        // make sure less than INT32_MAX
+        timeout &= 0x7fffffff;
         while (_engine_fd > 0) {
             int ret = epoll_wait(_engine_fd, _events, LEN(_events), timeout);
             if (ret < 0) {