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int semget(
key_t key, //±êʶÐźÅÁ¿µÄ¹Ø¼ü×Ö£¬ÓÐÈýÖÖ·½·¨£º1¡¢Ê¹ÓÃIPC——PRIVATEÈÃϵͳ²úÉú£¬
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int nSemes, //ÐźÅÁ¿¼¯ÖÐÔªËØ¸öÊý
int flag //IPC_CREAT£»IPC_EXCL Ö»ÓÐÔÚÐźÅÁ¿¼¯²»´æÔÚʱ´´½¨
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key_t ftok(const char *pathname,int proj_id);
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int semctl(
int semid, //ÐźÅÁ¿¼¯µÄ¾ä±ú
int semnum, //ÐźÅÁ¿¼¯µÄÔªËØÊý
int cmd, //ÃüÁî
/*union senum arg */... //
)
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GETVAL »ñµÃÒ»¸öÖ¸¶¨ÐźÅÁ¿µÄÖµ
GETPID »ñµÃ×îºó²Ù×Ý´ËÔªËØµÄ×îºó½ø³ÌID
GETNCNT »ñµÃµÈ´ýÔªËØ±äΪ1µÄ½ø³ÌÊý
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union senum{
int val;
struct semid_ds *buf;
unsigned short * array;
}agc;
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struct semid_ds{
struct ipc_pem sem_pem; //operation pemission struct
time_t sem_otime; //last semop()time
time_t sem_ctime; //last
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