glib编程 (main event loop)

老鱼 posted @ 2010年1月31日 09:06 in c/cplusplus , 8322 阅读

最简单的例子

 

int main(int argc,char* argv)
{
	if (g_thread_supported() == 0)
		g_thread_init(NULL);

	g_print("g_main_loop_new\n");

	loop=g_main_loop_new(NULL,FALSE);
	
	g_print("g_main_loop_run\n");
	g_main_loop_run(loop);	
	
	g_print("g_main_loop_unref\n");
	g_main_loop_unref(loop);

	return 0;
}

 

 

你会发现程序会在 g_main_loop_run函数阻塞,这就是glib main loop了,如果没有人通知它退出,它是不会退出的。
通知循环退出的函数是 g_main_loop_quit。
怎么通知呢?主线程被g_main_loop_run阻塞了,没办法运行quit。本来我准备开一个线 程,sleep一秒钟,然后调用g_main_loop_quit。不过一想我们都在学习高精尖武器了,还用土枪土炮干啥。使用glib的定时器吧~

 

 

#include <glib.h>


GMainLoop *loop;

gint counter = 10;
gboolean mycallback(gpointer arg)
{
	g_print(".");
	if(--counter==0){
		g_print("\n");
		//exiting lop
		g_main_loop_quit(loop);
		return FALSE;
		}
	return TRUE;
}

int main(int argc,char* argv)
{
	if (g_thread_supported() == 0)
		g_thread_init(NULL);

	g_print("g_main_loop_new\n");

	loop=g_main_loop_new(NULL,FALSE);

	g_timeout_add(100,mycallback,NULL);
		
	g_print("g_main_loop_run\n");
	g_main_loop_run(loop);

	
	
	g_print("g_main_loop_unref\n");
	g_main_loop_unref(loop);

	return 0;
}


 

 

.

一秒钟后,程 序正常退出了!

 

 

 

引:http://baicj.spaces.live.com/blog/cns!F60F8E193FAC08E4!410.entry

Avatar_small
linuxdog 说:
2014年4月27日 05:50

timer 在glib内部是否是一个线程实现的呢?

Avatar_small
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