From e4426250880c373029f1f56524bde11bdab12803 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?book=E8=AF=97=E6=84=8F?= <ibookshiyi@gmail.com>
Date: Thu, 11 Mar 2021 11:12:03 +0800
Subject: [PATCH] =?UTF-8?q?=E6=8F=90=E9=AB=98buf=E4=B8=BA=E7=A9=BA?=
 =?UTF-8?q?=E6=97=B6=E7=9A=84elog=5Fflush()=20=E6=80=A7=E8=83=BD=20(#81)?=
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* 先判断buf中是否有数据，再进行上锁-输出-解锁的操作，避免buf为空时的频繁上/解锁操作
---
 easylogger/src/elog_buf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/easylogger/src/elog_buf.c b/easylogger/src/elog_buf.c
index b4a8f10..933c450 100644
--- a/easylogger/src/elog_buf.c
+++ b/easylogger/src/elog_buf.c
@@ -82,6 +82,8 @@ void elog_buf_output(const char *log, size_t size) {
  * flush all buffered logs to output device
  */
 void elog_flush(void) {
+    if (buf_write_size == 0)
+        return;
     /* lock output */
     elog_output_lock();
     /* output log */