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#include <stdio.h>
#include <stdlib.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <sys/types.h>
#include <fcntl.h>
struct sembuf sops;
static int sid;
//´´½¨Ò»¸öеÄÐźÅÁ¿¼¯
int createSemset(void)
{
char* pathname="semset";
if( access(pathname, F_OK)!=0 )
{
int fd=open(pathname, O_RDWR | O_CREAT, 0666);
if( fd<0 )
{
perror("open");
return -1;
}
}
key_t key=ftok(pathname, 'a');
if( -1==key )
{
perror("ftok");
return -1;
}
return semget(key, 1, IPC_CREAT | 0666) ;
}
//P²Ù×÷
int P(void)
{
sops.sem_num=0;
sops.sem_op=-1;
sops.sem_flg=0;
return semop(sid, &sops, 1);
}
//V²Ù×÷
int V(void)
{
sops.sem_num=0;
sops.sem_op=1;
sops.sem_flg=0;
return semop(sid, ......
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