线程之间的通信socketpair【学习笔记】【原创】

平台信息:
内核：linux3.1.0
系统：android5.0
平台：tiny4412

作者：庄泽彬(欢迎转载，请注明作者)

说明: 韦老师的安卓视频学习笔记

一、在一个进程中多个线程如何进行通信，主要使用的是socketpair的机制，详细代码如下:

 #include <pthread.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <sys/types.h>          /* See NOTES */
 #include <sys/socket.h>

 #define SOCKET_BUFFER_SIZE      (32768U)
 #define BUF_MAX_LEN              512

 void *function_thread (void *arg)
 {
     int fd = (int)arg;
     char buf[BUF_MAX_LEN];
     int cnt = ;
     int len = -;

     while()
     {
         len = sprintf(buf,"Hello,main thread1, cnt = %d\r\n",cnt++);
         write(fd,buf,len);

         len = read(fd,buf,BUF_MAX_LEN);
         buf[len] = '\0';
         printf("thead1 read:%s\r\n",buf);

         sleep();
     }

     return NULL;
 }

 int main(int argc,char **argv)
 {
     int ret = -;
     int sockets[];
     int bufferSize = SOCKET_BUFFER_SIZE;
     pthread_t threadID;
     char buf[BUF_MAX_LEN];
     int len = ;
     int cnt = ;
     int fd = -;

     ret = socketpair(AF_UNIX,SOCK_SEQPACKET,,sockets);
     if(ret){
         printf("Error socketpair\r\n");
         return -;
     }

     setsockopt(sockets[], SOL_SOCKET, SO_SNDBUF, &bufferSize, sizeof(bufferSize));
     setsockopt(sockets[], SOL_SOCKET, SO_RCVBUF, &bufferSize, sizeof(bufferSize));
     setsockopt(sockets[], SOL_SOCKET, SO_SNDBUF, &bufferSize, sizeof(bufferSize));
     setsockopt(sockets[], SOL_SOCKET, SO_RCVBUF, &bufferSize, sizeof(bufferSize));

     ret = pthread_create(&threadID,NULL,function_thread,(void *)sockets[]);

     fd = sockets[];

     while(){
         len = read(fd,buf,BUF_MAX_LEN);
         buf[len] = '\0';
         printf("Main thread read:%s\r\n",buf);

         len = sprintf(buf,"Hello,thread1, cnt = %d\r\n",cnt++);
         write(fd,buf,len);
     }

     return ;
 }

编译方法:gcc -o socketpair socketpair.c -lpthread

二、实验现象:

三、如下图所示socketpair的进程号为5919,在这个进程下面有两个线程运行。