linux：共享内存

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#include <sys/ipc.h>#include <sys/shm.h>#include <string.h>#include <stdio.h>#include <stdlib.h>#include <iostream>using namespace std;struct shared_use_st{int flags;char buff[1000];};int main(){void *shared_memory = NULL;int shmid = shmget((key_t)1234,sizeof(shared_use_st),0666|IPC_CREAT);if(shmid==-1){fprintf(stderr,"shmget failed\n");exit(0);}shared_memory = shmat(shmid,(void *)0,0);if(shared_memory==(void *)-1){printf("Error");exit(0);}printf("Memory attached at %x\n",(int)shared_memory);shared_use_st *shared_buff = (shared_use_st*)shared_memory;shared_buff->flags = 0;if(fork()==0){while(1){ while(shared_buff->flags==0) {strncpy(shared_buff->buff,"liuhuiyan",10);shared_buff->flags = 1;sleep(1); }}}else{while(1){while(shared_buff->flags==1){char data_buff[100];strcpy(data_buff,shared_buff->buff);cout<<data_buff<<endl;shared_buff->flags=0;}}}shmdt(shared_memory);return 0;}

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