linux 进程和线程或线程和线程之间通过管道通信（pipe）

 

linux 进程和线程或线程和线程之间通过管道通信（pipe）

转自：http://blog.csdn.net/robertkun/article/details/8095331

线程间通信：

 #include   // printf
 #include  // exit
 #include  // pipe
 #include  // strlen
 #include  // pthread_create

 using namespace std;

 void *func(void * fd)
 {
         printf("write fd = %d\n", *(int*)fd);
         char str[] = "hello everyone!";
         write( *(int*)fd, str, strlen(str) );
 }

 int main()
 {
         int fd[2];
         char readbuf[1024];

         if(pipe(fd) < 0)
         {
                 printf("pipe error!\n");
         }

         // create a new thread
         pthread_t tid = 0;
         pthread_create(&tid, NULL, func, &fd[1]);
         pthread_join(tid, NULL);

         sleep(3);

         // read buf from child thread
         read( fd[0], readbuf, sizeof(readbuf) );
         printf("read buf = %s\n", readbuf);

         return 0;
 }

 // 输出结果

 write fd = 4
 read buf = hello everyone!�

进程间通信：

 #include   // printf
 #include  // exit
 #include  // pipe
 #include  // strlen
 #include  // pthread_create

 using namespace std;

 int main()
 {
         int fd[2];
         int pid = 0;
         char str[] = "hello";
         char readbuf[1024];

         if(pipe(fd) < 0)
         {
                 printf("pipe error!\n");
         }

         if((pid = fork()) < 0)
         {
                 printf("fork error!\n");
         }
         else if(pid == 0)
         {
                 printf("child process!\n");

                 // close read channel
                 close(fd[0]);
                 write(fd[1], str, strlen(str));
         }
         else
         {
                 printf("father process!\n");

                 // close write channel
                 close(fd[1]);
                 read(fd[0], readbuf, sizeof(readbuf));
                 printf("readbuf = %s\n", readbuf);
         }

         return 0;
 }

 // 输出结果：

 father process!
 child process!
 readbuf = hello