64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
#include <sys/sem.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <stdio.h>
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#include <custom_sem.h>
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#include <structures.h>
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#include <errExit.h>
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int _SEMID;
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void resetServerSem(int semid);
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void setupServerSem() {
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key_t semKey = ftok(KEYFILE, SEMKEY);
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_SEMID = semget(semKey, 3, IPC_CREAT | S_IRUSR | S_IWUSR);
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if (_SEMID == -1) {
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errExit("getsem", "F4Server");
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}
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resetServerSem(_SEMID);
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}
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void setupClientSem() {
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key_t semKey = ftok(KEYFILE, SEMKEY);
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_SEMID = semget(semKey, 3, IPC_CREAT | S_IRUSR | S_IWUSR);
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if (_SEMID == -1) {
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errExit("getsem", "F4Client");
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}
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}
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void semOp(int semid, short sem_num, short sem_op) {
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struct sembuf sop = {.sem_num = sem_num, .sem_op = sem_op, .sem_flg = 0};
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int res;
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do {
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res = semop(semid, &sop, 1);
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} while ((errno == EINTR));
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if (res == -1) {
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errExitMsg("semOp");
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}
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}
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int getSemid(key_t key, int size){
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int semid = semget(key, size, S_IRUSR | S_IWUSR | IPC_CREAT);
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if (semid == -1) {
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errExit("semget", "getSemid");
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}
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return semid;
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}
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// mette i semafori a 0 e 2
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void resetServerSem(int semid){
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unsigned short val[3] = {0, 0, 0}; // player1, player2, server
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union semun arg;
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arg.array = val;
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if (semctl(semid, 0 , SETALL, arg) == -1) {
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errExit("semctl", "getSemid");
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}
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} |