libuv 定时器使用

老大前几天提到libuv，我只看过一点libevent, 听说过libev，没听说过libuv，查了一下才知道libuv。

先到github git clone 源码，编译，测试，看测试代码

头文件uv.h定时器部分的函数，头文件有详细的注释

/* uv_timer_test.c */


#include <stdlib.h>
#include <uv.h>
#include <stdio.h>
#include <assert.h>
#include <time.h>

static void timer_cb(uv_timer_t *handle, int status) 
{
	static int count;
	printf("count %d now %d\n", count++, time(NULL));
}

int main(int argc, char *argv[])
{
	int r;
	uv_timer_t timer;
	r = uv_timer_init(uv_default_loop(), &timer);
	assert(r == 0);
	
	assert(!uv_is_active((uv_handle_t *) &timer));
	assert(!uv_is_closing((uv_handle_t *) &timer));
	printf("start %d\n", time(NULL));
	r = uv_timer_start(&timer, timer_cb, atoi(argv[1]), 0);

	r = uv_run(uv_default_loop(), UV_RUN_DEFAULT);
	assert(r == 0);
	return 0;
}

测试程序流程非常简单，

初始化定时器uv_timer_init

注册自己的定时回调函数uv_timer_start

运行 uv_run

编译：gcc -o test-uv-timer test_uv_timer.c -luv

注意在uv_timer_start函数的参数repeat设置为1的话，time_cb在第一次定时时间到后之后会一直回调

最后贴上修改的test-acitive.c代码，从这个测试代码和uv.h的函数注释基本可以学会使用定时器的使用。

#include <uv.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>

#define ASSERT assert
static int close_cb_called = 0;


static void close_cb(uv_handle_t* handle) {
  ASSERT(handle != NULL);
  close_cb_called++;
}


static void timer_cb(uv_timer_t* handle, int status) {
  ASSERT(0 && "timer_cb should not have been called");
}


int main()
{
  int r;
  uv_timer_t timer;

  r = uv_timer_init(uv_default_loop(), &timer);
  ASSERT(r == 0);

  ASSERT(!uv_is_active((uv_handle_t*) &timer));
  ASSERT(!uv_is_closing((uv_handle_t*) &timer));

  r = uv_timer_start(&timer, timer_cb, 1000, 0);
  ASSERT(r == 0);

  ASSERT(uv_is_active((uv_handle_t*) &timer));
  ASSERT(!uv_is_closing((uv_handle_t*) &timer));

  r = uv_timer_stop(&timer);
  ASSERT(r == 0);

  ASSERT(!uv_is_active((uv_handle_t*) &timer));
  ASSERT(!uv_is_closing((uv_handle_t*) &timer));

  r = uv_timer_start(&timer, timer_cb, 1000, 0);
  ASSERT(r == 0);

  ASSERT(uv_is_active((uv_handle_t*) &timer));
  ASSERT(!uv_is_closing((uv_handle_t*) &timer));

  uv_close((uv_handle_t*) &timer, close_cb);

  ASSERT(!uv_is_active((uv_handle_t*) &timer));
  ASSERT(uv_is_closing((uv_handle_t*) &timer));

  r = uv_run(uv_default_loop(), UV_RUN_DEFAULT);
  ASSERT(r == 0);

  ASSERT(close_cb_called == 1);

  return 0;
}

libuv 定时器使用,布布扣,bubuko.com

libuv 定时器使用

原文：http://blog.csdn.net/gamesofsailing/article/details/20143535