1、【修改】Linux Demo ，使其开启异步输出模式。

Signed-off-by: armink <armink.ztl@gmail.com>

demo/os/linux/README.md

@@ -4,7 +4,7 @@
 
 ## 1、简介
 
-使用GCC编译。通过 `main.c` 的 `test_elog()` 方法来测试日志的输出。
+使用GCC编译。通过 `main.c` 的 `test_elog()` 方法来测试日志的输出。已在 `easylogger\inc\elog_cfg.h` 开启异步输出模式。
 
 ### 1.1、使用方法
 

demo/os/linux/easylogger/inc/elog_cfg.h

@@ -45,5 +45,11 @@
 #define ELOG_FILTER_KW_MAX_LEN               16
 /* output newline sign */
 #define ELOG_NEWLINE_SIGN                    "\n"
+/* enable asynchronous output mode */
+#define ELOG_ASYNC_OUTPUT_ENABLE
+/* buffer size for asynchronous output mode */
+#define ELOG_ASYNC_OUTPUT_BUF_SIZE           (LOG_LINE_BUF_SIZE * 100)
+/* asynchronous output mode using POSIX pthread implementation */
+#define ELOG_ASYNC_OUTPUT_USING_PTHREAD
 
 #endif /* _ELOG_CFG_H_ */

demo/os/linux/make.sh

@@ -1,6 +1,8 @@
 #!/bin/bash
 gcc -I "easylogger/inc" -I "../../../easylogger/inc" -O0 -g3 -Wall -c "../../../easylogger/src/elog.c" -o "out/elog.o" 
+gcc -I "easylogger/inc" -I "../../../easylogger/inc" -O0 -g3 -Wall -c "../../../easylogger/src/elog_async.c" -o "out/elog_async.o" 
+gcc -I "easylogger/inc" -I "../../../easylogger/inc" -O0 -g3 -Wall -c "../../../easylogger/src/elog_buf.c" -o "out/elog_buf.o" 
 gcc -I "easylogger/inc" -I "../../../easylogger/inc" -O0 -g3 -Wall -c "easylogger/port/elog_port.c" -o "out/elog_port.o"
 gcc -I "easylogger/inc" -I "../../../easylogger/inc" -O0 -g3 -Wall -c  "../../../easylogger/src/elog_utils.c" -o "out/elog_utils.o"
 gcc -I "easylogger/inc" -I "../../../easylogger/inc" -O0 -g3 -Wall -c "main.c" -o "out/main.o"
-gcc -o out/EasyLoggerLinuxDemo "out/main.o" "out/elog_utils.o" "out/elog.o" "out/elog_port.o" -lpthread
+gcc -o out/EasyLoggerLinuxDemo "out/elog.o" "out/elog_async.o" "out/elog_buf.o" "out/elog_port.o" "out/elog_utils.o" "out/main.o" -lpthread