用libevent多线程方式实现echo server

来源：互联网发布：巫师三优化编辑：程序博客网时间：2024/05/19 19:33

from http://blog.chinaunix.net/uid-756931-id-353296.html
功能：

主线程同时监听定时器事件和IO事件，工作线程简单的监听IO事件。

主线程每隔一秒种向工作线程发送一条字符串信息

工作线程显示该信息并回显给主线程

该示例演示了主线程如何同时监听多个事件。

Makefile

eventtest : eventtest.c
gcc -Wall -g -levent -lpthread -o eventtest eventtest.c
.PHONY : clean
clean :
rm eventtest -f

        #include <stdio.h>    #include <stdlib.h>    #include <unistd.h>    #include <pthread.h>    #include <sys/types.h>    #include <sys/socket.h>    #include <event.h>    struct event_base *workerbase;    int fd[2];    static void    thread_libevent_process(int fd, short which, void *arg)    {        int ret;        char buf[128];        ret = read(fd, buf, 128);        if (ret > 0) {            buf[ret] = '\0';            printf("thread receive message : %s\n", buf);        }        sleep(1);        write(fd, buf, ret);        return;    }    static void *    worker_thread(void *arg)    {        int fd = *(int *)arg;        struct event ev;        event_set(&ev, fd, EV_READ | EV_PERSIST, thread_libevent_process, NULL);        event_base_set(workerbase, &ev);        event_add(&ev, 0);        event_base_loop(workerbase, 0);        return NULL;    }    static void    main_event_process(int fd, short which, void *arg)    {        int ret;        char buf[128];        ret = read(fd, buf, 128);        if (ret > 0) {            buf[ret]='\0';            printf("main thread receive echo message : %s\n", buf);        }                return;    }    static void    timeout_cb(int fdd, short event, void *arg)    {        struct timeval tv;        struct event *timeout = arg;        write(fd[0], "Hello world!", sizeof("Hello world!") - 1);        evutil_timerclear(&tv);        tv.tv_sec = 1;        event_add(timeout, &tv);    }    int    main (int argc, char *argv[])    {        int ret;        pthread_t tid;        struct event ev;        struct event evtimeout;        struct timeval tv;        struct event_base *base;        base = event_init();        if (base == NULL) {            perror("event_init( base )");            return 1;        }        workerbase = event_init();        if (workerbase == NULL) {            perror("event_init( workerbase )");            return 1;        }        ret = socketpair(AF_LOCAL, SOCK_STREAM, 0, fd);        if (ret == -1) {            perror("socketpair() : ");            return 1;        }        event_set(&ev, fd[0], EV_READ | EV_PERSIST, main_event_process, NULL);        event_base_set(base, &ev);        event_add(&ev, 0);        evtimer_set(&evtimeout, timeout_cb, &evtimeout);        event_base_set(base, &evtimeout);        evutil_timerclear(&tv);        tv.tv_sec = 1;        event_add(&evtimeout, &tv);        ret = pthread_create(&tid, NULL, worker_thread, (void *)&fd[1]);        if (ret != 0) {            perror("pthread_create()");            return 1;        }        event_base_loop(base, 0);        return 0;    }

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