使用线程池编写程序

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服务器：

#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"  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(2);      }      // 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(3);      }      // 3. listen socket      if( listen(sock, 5) < 0)       {          perror("listen ---");          exit(4);      }      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 1;      }      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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