准备写一个网络游戏的服务器的通讯模块，参考网上看到的一些代码，在linux下面实现一个多线程的epoll模型的socket通讯的代码,以下是第一部分多线程的切换代码:  1 #include <stdio.h>
  2 #include <sys/types.h>
  3 #include <sys/epoll.h>
  4 #include <sys/socket.h>
  5 #include <signal.h>
  6 #include <fcntl.h>
  7 #include <map>
  8 #include <errno.h>
  9 #include <pthread.h>
 10 #include <stdlib.h>
 11 #include <unistd.h>
 12 using namespace std;
 13
 14 struct conninfo{
 15     int rfd;
 16     int wfd;
 17     //map<struct ipport, struct perrinfo> peer;
 18 };
 19
 20 bool g_bRun;
 21
 22 struct conninfo g_ConnInfo;
 23
 24 void setnonblocking(int sock)
 25 {
 26     int opts;
 27     opts = fcntl(sock, F_GETFL);
 28     if(opts < 0)
 29     {
 30         printf("fcntl(sock, GETFL)");
 31         exit(1);
 32     }
 33     opts = opts | O_NONBLOCK;
 34     if(fcntl(sock, F_SETFL, opts) < 0)
 35     {
 36         printf("fcntl(sock, SETFL, opts)");
 37         exit(1);
 38     }
 39     return ;
 40 }
 41
 42 static void sig_pro(int signum)
 43 {
 44     printf("sig_pro recv signal: %d\n", signum);
 45     if(signum == SIGQUIT)
 46     {
 47         g_bRun = false;
 48     }
 49 }
 50
 51 void* AcceptThread(void* arg)
 52 {
 53     printf("accpet thread\n");
 54     return NULL;
 55 }
 56
 57 void* ReadThread(void* arg)
 58 {
 59     printf("read thread\n");
 60     return NULL;
 61 }
 62
 63 int main()
 64 {
 65     int ret;
 66     int fd[2];  //pipe
 67     pthread_t iAcceptThreadId;
 68     pthread_t iReadThreadId;
 69
 70     struct sigaction sa;
 71     sa.sa_flags = SA_RESTART;
 72     sa.sa_handler = sig_pro;
 73     sigaction(SIGINT, &sa, NULL);
 74     sigaction(SIGUSR1, &sa, NULL);
 75     sigaction(SIGUSR2, &sa, NULL);
 76
 77
 78     g_bRun = true;
 79     ret = pipe(fd);
 80     if(ret < 0)
 81     {
 82         printf("main, pipe fall, %d %s\n", ret, errno);
 83         g_bRun = false;
 84         return 0;
 85     }
 86
 87     g_ConnInfo.rfd = fd[0];
 88     g_ConnInfo.wfd = fd[1];
 89
 90     setnonblocking(g_ConnInfo.rfd);
 91
 92     pthread_attr_t attr;
 93     pthread_attr_init(&attr);
 94     pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
 95
 96     ret = pthread_create(&iAcceptThreadId, &attr, AcceptThread, NULL);
 97     if(ret != 0)
 98     {
 99         printf("main, create accept thread fail: %s\n", errno);
100         g_bRun = false;
101         close(g_ConnInfo.rfd); //关闭管道
102         close(g_ConnInfo.wfd);
103         return 0;
104     }
105
106     ret = pthread_create(&iReadThreadId, &attr, ReadThread, NULL);
107     if(ret != 0)
108     {
109         printf("main, create read thread fail: %s\n", errno);
110         g_bRun = false;
111         pthread_join(iAcceptThreadId, NULL);
112         close(g_ConnInfo.rfd);　　　　
113         close(g_ConnInfo.wfd);
114
115         return 0;
116     }
117
118     while(g_bRun)
119     {
120         sleep(1);
121     }
122
123     pthread_join(iAcceptThreadId, NULL);  //收回线程的资源，销毁线程
124     pthread_join(iReadThreadId, NULL);
125     close(g_ConnInfo.rfd);
126     close(g_ConnInfo.wfd);
127
128     return 0;
129 }