linux__select__操作

select 一般用在多线程中的阻塞检测一定的动作发生后执行的，如果只是在两个函数中，func1(select();) func2(select();)如果这两个函数依次调用，则先阻塞第一个函数，然后再次阻塞第二个函数。

#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <errno.h>#include <string.h>#include <sys/types.h>#include <sys/socket.h>#include <sys/time.h>#include <netinet/in.h>#include <arpa/inet.h>#include <fcntl.h>#include <dirent.h>#include <sys/stat.h>#include <sys/ioctl.h>#include <sys/mman.h>#include <sys/poll.h>#include <linux/soundcard.h>#include <string.h> #include <signal.h>#include <time.h>#include <pthread.h>#include <unistd.h>#include <sys/types.h>#include <netinet/in.h>#include <arpa/inet.h>#include <sys/socket.h>#include <stdlib.h>#include <pthread.h>#include <errno.h>#include <string.h> /*--------------------------------------------------------------------------------------------*/void  CTcpServer::findMaxClientsockId() {     CycleList *pList=CmdSockList.GetHead();     int maxid=0;     maxid=m_ServerSockId;                         while(pList!=NULL)                         {                                   if(pList->lSocket>=maxid)                                   {                                          maxid=pList->lSocket;                                   }                       pList=CmdSockList.GetNext(pList);                         }             m_maxClientsockId = maxid;}extern int gTcpSvrQuit; int   CTcpServer::  CreateTcpServer() {                            fd_set  acp_fdsr; //文件描述符集的定义                                                                               struct timeval tv;                m_CurrentConnCnt =0;                 sin_size = sizeof(client_addr);                  m_maxClientsockId = m_ServerSockId;                 CycleList *pList=CmdSockList.GetHead();               while(gTcpSvrQuit)               {                                                         FD_ZERO(&fdsr);/// acp_fdsr                            FD_SET(m_ServerSockId,&fdsr);                                                  tv.tv_sec = 30;                           tv.tv_usec =0;                               pList=CmdSockList.GetHead();                          while(pList!=NULL)                          {                            FD_SET(pList->lSocket,&fdsr);                                     ///   printf("lSocket is %d\n",pList->lSocket);                            pList=CmdSockList.GetNext(pList);                          }                                                 ret = select(m_maxClientsockId +1,&fdsr,NULL,NULL,&tv);                         if(ret <0)                          {                                 perror("select error!\n");                                 break;                          }                          else if(ret ==0)                           {                              ///    printf("timeout \n");                                 continue;                          }                          while(pList!=NULL)                          {                                   if(FD_ISSET(pList->lSocket,&fdsr))                                 {                                                                        }                                pList=pList->lNext;                      }                     if(FD_ISSET(m_ServerSockId,&fdsr))                     {                        new_fd = accept(m_ServerSockId,(struct sockaddr *)&client_addr,&sin_size);                          if(new_fd <=0)                        {                                             perror("accept error::");                              continue;                                       }                    }              }              return 0; }

以后增加。。。