消息队列

来源：互联网发布：linux进程数据结构编辑：程序博客网时间：2024/06/05 20:40
#include <sys/types.h>#include <sys/msg.h>#include <unistd.h>#include <stdio.h>#include <stdlib.h>#include <sys/ipc.h>#include <string.h>#include <signal.h>struct msg_buf    {        int mtype;        char data[255];    };int main(){        key_t key;        pid_t pid;        int msgid;        int ret;        struct msg_buf msgbuf;        struct msg_buf msgbuf1;        struct msg_buf msgbuf2;        struct msg_buf msgbuf3;        int i = 0;        key=ftok(".",'a');        printf("key =[%x]\n",key);        msgid=msgget(key,IPC_CREAT|0666); /*通过文件对应*/        if(msgid==-1)        {                printf("create error\n");                return -1;        }         if((pid = fork()) < 0)         {             perror("fork error");             exit(0);         }         if( pid > 0)       {            msgbuf1.mtype = 1;            strcpy(msgbuf1.data,"test haha1");            msgbuf2.mtype = 2;            strcpy(msgbuf2.data,"test haha2");            msgbuf3.mtype = 3;            strcpy(msgbuf3.data,"test haha3");            ret=msgsnd(msgid,&msgbuf1,sizeof(msgbuf1.data),IPC_NOWAIT);            if(ret==-1)            {                printf("send message err\n");                return -1;            }            //sleep(3);            ret=msgsnd(msgid,&msgbuf2,sizeof(msgbuf2.data),IPC_NOWAIT);            if(ret==-1)            {                printf("send message err\n");                return -1;            }           // sleep(3);            ret=msgsnd(msgid,&msgbuf3,sizeof(msgbuf3.data),IPC_NOWAIT);            if(ret==-1)            {                printf("send message err\n");                return -1;            }           // sleep(3);           // kill(pid,SIGSTOP);            waitpid(pid,NULL,0);            exit(0);       }         if( pid == 0)         {            while(i < 3)            {                i++;                memset(&msgbuf,0,sizeof(msgbuf));                ret=msgrcv(msgid,&msgbuf,sizeof(msgbuf.data),i,0);                if(ret==-1)                {                    printf("recv message err\n");                    return -1;                }                printf("recv msg =[%s]\n",msgbuf.data);                sleep(1);            }               exit(0);         }     return 0;}
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