共享內存

共享內存是IPC機制中的一種，它允許兩個相關的進程訪問同一段內存，這是傳遞數據的一種有效的方式。

?

A.c

#include <sys/types.h> #include <sys/ipc.h> #include <sys/shm.h> #include <stdio.h> #include <string.h>#define SIZE 2048typedef struct sharemem{int flag; //共享標志char data[SIZE]; //共享數據 }ShareMem;void main(){//創建共享內存int key;int shmid;key = ftok("./", 0);shmid = shmget(key, sizeof(ShareMem), IPC_CREAT);//映射共享內存ShareMem *shareMem;shareMem = (ShareMem *)shmat(shmid, NULL, 0);//設置共享內存shareMem->flag = 0;while(1){//判斷共享標志while(shareMem->flag != 0);//獲取用戶輸入char buffer[SIZE];fgets(buffer, SIZE, stdin);//寫入共享內存strncpy(shareMem->data, buffer, SIZE);shareMem->flag = 1;//判斷是否退出if(strncmp(buffer, "quit", 4) == 0){break;}}//脫離共享內存shmdt((const void *)shareMem); }

?

B.c

#include <sys/types.h> #include <sys/ipc.h> #include <sys/shm.h> #include <stdio.h> #include <string.h>#define SIZE 2048typedef struct sharemem{int flag; //共享標志char data[SIZE]; //共享數據 }ShareMem;void main(){//打開共享內存int key;int shmid;key = ftok("./", 0);shmid = shmget(key, sizeof(ShareMem), IPC_CREAT);//映射共享內存ShareMem *shareMem;shareMem = (ShareMem *)shmat(shmid, NULL, 0);//設置共享內存shareMem->flag = 1;while(1){//判斷共享標志while(shareMem->flag != 1);//讀取共享內存char buffer[SIZE];strncpy(buffer, shareMem->data, SIZE);shareMem->flag = 0;//顯示共享內存printf("%s", buffer);//判斷是否退出if(strncmp(buffer, "quit", 4) == 0){break;}}//脫離共享內存shmdt((const void *)shareMem);//刪除共享內存 shmctl(shmid, IPC_RMID, NULL); }

?

轉載于:https://www.cnblogs.com/d442130165/p/5226824.html

總結

以上是生活随笔為你收集整理的[国嵌攻略][085][共享内存通讯]的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。