static void test(struct schedule *S) 
{
	struct args arg1 = { 0 };
	struct args arg2 = { 100 };

	int co1 = coroutine_new(S, foo, &arg1);
	int co2 = coroutine_new(S, foo, &arg2);
	printf("main start\n");
	while (coroutine_status(S,co1) && coroutine_status(S,co2)) {
		coroutine_resume(S,co1);
		coroutine_resume(S,co2);
	} 
	printf("main end\n");
}
int main()
{
	int listenfd, optval = 1;
	int i;
	int port = 9500;
	struct sockaddr_in serveraddr;
	listenfd = socket(AF_INET, SOCK_STREAM, 0);
	setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, (const void *)&optval , sizeof(int));

	bzero((char *) &serveraddr, sizeof(serveraddr));
    serveraddr.sin_family = AF_INET; 
    serveraddr.sin_addr.s_addr = htonl(INADDR_ANY); 
    serveraddr.sin_port = htons((unsigned short)port);

    bind(listenfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr));

    listen(listenfd, 1024);

    make_socket_non_blocking(listenfd);

    struct schedule * S = coroutine_open();
    printf("start..\n");
    int co1 = coroutine_new(S, acceptfun, (void *)&listenfd);
    printf("%d\n", S->cap);
    printf("%d\n", co1);
    for(i = 0; i < S->cap; i++) {
    	if(coroutine_status(S, i)) {
    		coroutine_resume(S,i);
    	}
    	if(i == S->cap - 1)
    		i = -1;
    }
    coroutine_close(S);
    close(listenfd);
    return 0;
}