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【Linux网络编程】基于TCP的线程池（pthread_pool）版本HTTP服务器

2017-06-01 17:50 537 查看
（线程池代码参考网上的）

服务器代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "mypthreadpool.h"

#define SOCK_FAIL 1
#define BIND_FAIL 2
#define LISTEN_FAIL 3
#define USE_ERROR 4
#define ACCPET_FAIL 5

int amount = 0;

// 使用说明
static void Usage(const char* arg)
{
printf("Usage:%s  [server_ip] [server_port]\n", arg);
}

int startup(const char* ip, int port)
{
// 1. new socket
int sock = socket(AF_INET, SOCK_STREAM, 0 );
if(sock < 0)
{
perror("socket ---");
exit(SOCK_FAIL);
}
// 2. bind socket
struct sockaddr_in local;
local.sin_family = AF_INET;
local.sin_addr.s_addr = inet_addr(ip);
local.sin_port = htons(port);

int opt = 1;
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
if( bind(sock, (struct sockaddr*)&local, sizeof(local)) < 0)
{
perror("bind ---");
exit(BIND_FAIL);
}

// 3. listen socket
if( listen(sock, 5) < 0)
{
perror("listen ---");
exit(LISTEN_FAIL);
}

return sock;
}

void* handler(void *arg)
{
int sock = (int)arg;

char buf[10240];
while(1)
{
ssize_t s = read(sock, buf, sizeof(buf)-1);
if(s < 0)
{
perror("Read");
exit(-1);
}
else if (s > 0)
{
const char* msg = "HTTP/1.1 200 OK\r\n\r\n<html><h1>This is title</h1></html>\r\n";

buf[s] = '\0';
printf("- message: %s \n", buf);
write(sock, msg, strlen(msg));
break;
}
else
break;
}
printf("quit\n");
}

int main(int argc, char* argv[])
{
pool_init(3);  // 线程池中最多三个活动线程
if(argc != 3)
{
Usage(argv[0]);
return USE_ERROR;
}
int listen_sock = startup(argv[1], atoi(argv[2])); // ip port
struct sockaddr_in peer;
socklen_t len = sizeof(peer);
printf("listen .... \n");
while(1)
{
int new_sock = accept(listen_sock, (struct sockaddr*)&peer, &len);
if( new_sock < 0)
{
perror("accept --- ");
continue;
}

printf("connect sucess ! client : ip %s prot %d \n", inet_ntoa(peer.sin_addr), ntohs(peer.sin_port));
pool_add_worker(handler, (void*)new_sock);

}
return 0;
}


线程池代码：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <pthread.h>
#include <assert.h>
/*
*线程池里所有运行和等待的任务都是一个CThread_worker
*由于所有任务都在链表里，所以是一个链表结构
*/
typedef struct worker
{
/*回调函数，任务运行时会调用此函数，注意也可声明成其它形式*/
void *(*process) (void *arg);
void *arg;/*回调函数的参数*/
struct worker *next;
} CThread_worker;

/*线程池结构*/
typedef struct
{
pthread_mutex_t queue_lock;
pthread_cond_t queue_ready;
/*链表结构，线程池中所有等待任务*/
CThread_worker *queue_head;
/*是否销毁线程池*/
int shutdown;
pthread_t *threadid;
/*线程池中允许的活动线程数目*/
int max_thread_num;
/*当前等待队列的任务数目*/
int cur_queue_size;
} CThread_pool;

int pool_add_worker (void *(*process) (void *arg), void *arg);
void *thread_routine (void *arg);

static CThread_pool *pool = NULL;
void
pool_init (int max_thread_num)
{
pool = (CThread_pool *) malloc (sizeof (CThread_pool));
pthread_mutex_init (&(pool->queue_lock), NULL);
pthread_cond_init (&(pool->queue_ready), NULL);
pool->queue_head = NULL;
pool->max_thread_num = max_thread_num;
pool->cur_queue_size = 0;
pool->shutdown = 0;
pool->threadid =
(pthread_t *) malloc (max_thread_num * sizeof (pthread_t));
int i = 0;
for (i = 0; i < max_thread_num; i++)
{
pthread_create (&(pool->threadid[i]), NULL, thread_routine,
NULL);
}
}

/*向线程池中加入任务*/
int
pool_add_worker (void *(*process) (void *arg), void *arg)
{
/*构造一个新任务*/
CThread_worker *newworker =
(CThread_worker *) malloc (sizeof (CThread_worker));
newworker->process = process;
newworker->arg = arg;
newworker->next = NULL;/*别忘置空*/
pthread_mutex_lock (&(pool->queue_lock));
/*将任务加入到等待队列中*/
CThread_worker *member = pool->queue_head;
if (member != NULL)
{
while (member->next != NULL)
member = member->next;
member->next = newworker;
}
else
{
pool->queue_head = newworker;
}
assert (pool->queue_head != NULL);
pool->cur_queue_size++;
pthread_mutex_unlock (&(pool->queue_lock));
/*好了，等待队列中有任务了，唤醒一个等待线程；
注意如果所有线程都在忙碌，这句没有任何作用*/
pthread_cond_signal (&(pool->queue_ready));
return 0;
}

/*销毁线程池，等待队列中的任务不会再被执行，但是正在运行的线程会一直
把任务运行完后再退出*/
int
pool_destroy ()
{
if (pool->shutdown)
return -1;/*防止两次调用*/
pool->shutdown = 1;
/*唤醒所有等待线程，线程池要销毁了*/
pthread_cond_broadcast (&(pool->queue_ready));
/*阻塞等待线程退出，否则就成僵尸了*/
int i;
for (i = 0; i < pool->max_thread_num; i++)
pthread_join (pool->threadid[i], NULL);
free (pool->threadid);
/*销毁等待队列*/
CThread_worker *head = NULL;
while (pool->queue_head != NULL)
{
head = pool->queue_head;
pool->queue_head = pool->queue_head->next;
free (head);
}
/*条件变量和互斥量也别忘了销毁*/
pthread_mutex_destroy(&(pool->queue_lock));
pthread_cond_destroy(&(pool->queue_ready));

free (pool);
/*销毁后指针置空是个好习惯*/
pool=NULL;
return 0;
}

void *
thread_routine (void *arg)
{
//printf ("starting thread 0x%x/n", pthread_self ());
while (1)
{
pthread_mutex_lock (&(pool->queue_lock));
/*如果等待队列为0并且不销毁线程池，则处于阻塞状态; 注意
pthread_cond_wait是一个原子操作，等待前会解锁，唤醒后会加锁*/
while (pool->cur_queue_size == 0 && !pool->shutdown)
{
printf ("thread 0x%x is waiting/n", pthread_self ());
pthread_cond_wait (&(pool->queue_ready), &(pool->queue_lock));
}
/*线程池要销毁了*/
if (pool->shutdown)
{
/*遇到break,continue,return等跳转语句，千万不要忘记先解锁*/
pthread_mutex_unlock (&(pool->queue_lock));
printf ("thread 0x%x will exit/n", pthread_self ());
pthread_exit (NULL);
}
printf ("thread 0x%x is starting to work/n", pthread_self ());
/*assert是调试的好帮手*/
assert (pool->cur_queue_size != 0);
assert (pool->queue_head != NULL);

/*等待队列长度减去1，并取出链表中的头元素*/
pool->cur_queue_size--;
CThread_worker *worker = pool->queue_head;
pool->queue_head = worker->next;
pthread_mutex_unlock (&(pool->queue_lock));
/*调用回调函数，执行任务*/
(*(worker->process)) (worker->arg);
free (worker);
worker = NULL;
}
/*这一句应该是不可达的*/
pthread_exit (NULL);
}
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