TCP多线程并发服务器+线程池+echo

这个架构容易写，在《Unix网络编程》中可以看到性能也还可以，最关键是我学会了。

基本思路就是服务器接收到一个客户的请求，就将个这个请求的任务添加到线程池的任务队列中，使用AddWork(void* (*func)(void *arg), void *arg)。

因此我们可以将自己的业务代码写在void* (*func)(void *arg)中，然后就OK了。我这里的业务是一个服务器echo客户端。

先看服务器端的代码：

线程池：

/*
 * ThreadPool.h
 *
 *  Created on: 2014年4月21日
 *      Author: tomcat
 */

#ifndef THREADPOOL_H_
#define THREADPOOL_H_

#include 
#include 

typedef struct work{
	void* (*func)(void *arg);
	void *arg;
	struct work *next;
}tpool_work_t;

typedef struct{
	int threadNum;
	bool shutDown;
	tpool_work_t* head;
	tpool_work_t* tail;
	pthread_t *tid;
	pthread_mutex_t queueMutex;
	pthread_cond_t queueReady;
}tpool;

static tpool *thread_pool = NULL;

int CreateThreadPool(tpool *thread_pool);
int AddWork(void* (*func)(void *arg), void *arg);
void DestroyThreadPool();


static void* ThreadFunc(void *arg)
{
	tpool_work_t *work;
	while(1){
		pthread_mutex_lock(&thread_pool->queueMutex);
		while(!thread_pool->head && !thread_pool->shutDown){
			pthread_cond_wait(&thread_pool->queueReady, &thread_pool->queueMutex);
		}

		if(thread_pool->shutDown){
			pthread_mutex_unlock(&thread_pool->queueMutex);
			pthread_exit(NULL);
		}

		work = thread_pool->head;
		thread_pool->head = thread_pool->head->next;
		pthread_mutex_unlock(&thread_pool->queueMutex);

		work->func(work->arg);

		free(work);
	}

	return NULL;
}

int CreateThreadPool(int threadNum){

	int i;

	thread_pool = (tpool*)malloc(sizeof(tpool));
	if(!thread_pool){
		printf("thread_pool create fail!\n");
		return -1;
	}

	thread_pool->threadNum = threadNum;
	thread_pool->shutDown = false;
	thread_pool->head = NULL;
	thread_pool->tail = NULL;
	thread_pool->tid = (pthread_t *)malloc(threadNum*sizeof(pthread_t));

	if(!thread_pool->tid){
		printf("thread create fail!\n");
		return -1;
	}

	if(pthread_mutex_init(&thread_pool->queueMutex, NULL) != 0){
		printf("mutex initialize error!\n");
		return -1;
	}
	if(pthread_cond_init(&thread_pool->queueReady, NULL) != 0){
		printf("cond initialize error!\n");
		return -1;
	}

	for(i=0; itid[i], NULL, ThreadFunc, NULL)){
			printf("thread create error!\n");
			return -1;
		}
	}

	return 0;
}

int AddWork(void* (*func)(void *arg), void *arg)
{
	tpool_work_t *work;

	if(!arg){
		printf("the input function is invalid!\n");
		return -1;
	}

	work = (tpool_work_t*)malloc(sizeof(tpool_work_t));
	if(!work){
		printf("new work create fail!\n");
		return -1;
	}
	work->func = func;
	work->arg = arg;
	work->next = NULL;

	pthread_mutex_lock(&thread_pool->queueMutex);
	if(!thread_pool->head){
		thread_pool->head = work;
		thread_pool->tail = work;
	}else{
		thread_pool->tail->next = work;
		thread_pool->tail = work;
	}
	pthread_cond_signal(&thread_pool->queueReady);
	pthread_mutex_unlock(&thread_pool->queueMutex);

	return 0;
}

void DestroyThreadPool()
{
	int i;
	tpool_work_t *work;
	if(thread_pool->shutDown){
		return ;
	}
	thread_pool->shutDown = true;

	pthread_cond_broadcast(&thread_pool->queueReady);
	for(i=0; ithreadNum; ++i){
		pthread_join(thread_pool->tid[i], NULL);
	}
	free(thread_pool->tid);

	while(thread_pool->head){
		work = thread_pool->head;
		thread_pool->head = thread_pool->head->next;
		free(work);
	}

	pthread_mutex_destroy(&thread_pool->queueMutex);
	pthread_cond_destroy(&thread_pool->queueReady);

	free(thread_pool);
}


#endif /* THREADPOOL_H_ */

EchoServer.cpp

//============================================================================
// Name        : EchoServer.cpp
// Author      : 
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include "ThreadPool.h"

const unsigned int PORT = 7777;
const unsigned int LISTEN_NUM = 128;
const unsigned int MAXLINE = 1024;

void* doit(void *arg)
{
	pthread_detach(pthread_self());
	char buf[MAXLINE];
	int connfd = (int)arg;
	int n = 0;
	while((n = recv(connfd, buf, sizeof(buf), 0)) > 0){
		send(connfd, buf, n, 0);
	}
	if(n == -1){
		printf("receive error\n");
	}
	close(connfd);
	return NULL;
}

int main() {
	struct sockaddr_in cliaddr, serveraddr;
	int listenfd, connfd;
	socklen_t clilen;
	pthread_t tid;

	listenfd = socket(AF_INET, SOCK_STREAM, 0);

	bzero(&serveraddr, sizeof(serveraddr));
	serveraddr.sin_family = AF_INET;
	serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
	serveraddr.sin_port = htons(PORT);

	if(bind(listenfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) == -1){
		printf("bind error\n");
		return -1;
	}

	if(listen(listenfd,LISTEN_NUM) == -1){
		printf("listen error\n");
		return -1;
	}

	CreateThreadPool(LISTEN_NUM);
	for(;;){
		clilen = sizeof(cliaddr);
		connfd = accept(listenfd, (struct sockaddr *)&cliaddr, &clilen);
		if(connfd>0){
			//if(pthread_create(&tid, NULL, doit, (void *)connfd)){
			if(AddWork(doit, (void *)connfd)){
				printf("pthread create error\n");
				return -1;
			}
		}
	}
        DestroyThreadPool();
	close(listenfd);
	return 0;
}

这里的

void* doit(void *arg)

就是我的echo业务。

客户端：

//============================================================================
// Name        : EchoClient.cpp
// Author      : 
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

const char *IPADRR = "127.0.0.1";
const unsigned int SERVERPORT = 7777;
const unsigned int MAXLINE = 1024;

void doit(FILE *fp, int sockfd)
{
	int ret;
	char send_buf[MAXLINE], recv_buf[MAXLINE];
	while(fgets(send_buf, MAXLINE, fp) != NULL){
		if((ret = send(sockfd, send_buf, strlen(send_buf), 0)) == -1){
			printf("send error\n");
			return;
		}
		//每次接收数据前将recv_buf清空,主要是填充'\0'，因为接收数据不会在添上'\0'为结尾
		bzero(recv_buf, MAXLINE);
		if((ret = recv(sockfd, recv_buf, MAXLINE, 0)) == 0){
			printf("server stopped!\n");
		}
		fputs(recv_buf, stdout);
	}
}

int main() {
	int clifd;
	struct sockaddr_in serveraddr;

	if((clifd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
		printf("socket create error\n");
		return -1;
	}

	bzero(&serveraddr, sizeof(serveraddr));
	serveraddr.sin_family = AF_INET;
	serveraddr.sin_addr.s_addr = inet_addr(IPADRR);
	serveraddr.sin_port = htons(SERVERPORT);

	if(connect(clifd, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) < 0){
		printf("connect to server fail\n");
		return -1;
	}

	printf("connect to server successfully!\n");

	doit(stdin, clifd);

	return 0;
}

客户端的执行结果就是这个样子：

tomcat@tomcat-Lenovo-IdeaPad-Y550:~/文档/Echo$ ./EchoClient
connect to server successfully!
12344
12344
2
2
adasdasdad
adasdasdad