sharememory.c-白红宇

sharememory.c

阅读量：6830 次

发布时间：2019-06-26

本文共 784 字，大约阅读时间需要 2 分钟。

//进程通信，共享存储区#include 
     
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                        #define SHMKEY 75int shmid,i;int *addr;void client(){ int i; shmid=shmget(SHMKEY,1024,0777); addr=shmat(shmid,0,0); for(i=9;i>=0;i--) { while(*addr!=-1); printf("(client)sent\n"); *addr=i; } exit(0);}void server(){ shmid=shmget(SHMKEY,1024,0777|IPC_CREAT); addr=shmat(shmid,0,0); do { *addr=-1; while(*addr==-1); printf("(server)received\n"); }while(*addr); shmctl(shmid,IPC_RMID,0); exit(0);}main(){ while((i=fork())==-1); if(!i)server(); system("ipcs -m"); while((i=fork())==-1); if(!i)client(); wait(0); wait(0);}