linux C 程序間共享記憶體以及臨界區的實現

不多說，直接貼**就是了

#ifndef sharehelper_h_included

#define sharehelper_h_included
#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std;
class sharehelper
;#endif // sharehelper_h_included

#include "sharehelper.h"

key_t sharedkey = 99;
size_t maxsize = 200;
union semum
arg;
sharehelper::sharehelper()
shmptr = shmat(shmid, null, 0);
if (shmptr == (void*)-1)
union semum sem;
sem.val = 1;
semid = semget(sharedkey, 1, ipc_creat | 0777);
if (semid == -1)
semctl(semid, 0, setval, sem);
}sharehelper::~sharehelper()
bool sharehelper::setsharedstr(string str)
string sharehelper::getsharedstr()
void sharehelper::lockshare()
void sharehelper::unlockshare()
int sharehelper::delsem()
int sharehelper::psem()
; return (semop(semid, &sops, 1));
}int sharehelper::vsem()
; return (semop(semid, &sops, 1));
}

臨界區分別是lockshare和unlockshare，共享記憶體則是setsharedstr和getsharedstr，建立乙個例項呼叫即可

經驗證還是挺好用的，注意字串的長度

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