mirror of https://github.com/BOINC/boinc.git
111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
// The contents of this file are subject to the BOINC Public License
|
|
// Version 1.0 (the "License"); you may not use this file except in
|
|
// compliance with the License. You may obtain a copy of the License at
|
|
// http://boinc.berkeley.edu/license_1.0.txt
|
|
//
|
|
// Software distributed under the License is distributed on an "AS IS"
|
|
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
|
|
// License for the specific language governing rights and limitations
|
|
// under the License.
|
|
//
|
|
// The Original Code is the Berkeley Open Infrastructure for Network Computing.
|
|
//
|
|
// The Initial Developer of the Original Code is the SETI@home project.
|
|
// Portions created by the SETI@home project are Copyright (C) 2002
|
|
// University of California at Berkeley. All Rights Reserved.
|
|
//
|
|
// Contributor(s):
|
|
//
|
|
|
|
|
|
// interfaces for accessing sempahores
|
|
|
|
#include <cstdio>
|
|
#include <cstring>
|
|
|
|
#include "error_numbers.h"
|
|
#include "synch.h"
|
|
|
|
#ifdef _USING_FCGI_
|
|
#include "fcgi_stdio.h"
|
|
#endif
|
|
|
|
union SEMUN {
|
|
int val;
|
|
struct semid_ds *buf;
|
|
unsigned short int *arra;
|
|
struct seminfo *__buf;
|
|
};
|
|
|
|
int create_semaphore(key_t key){
|
|
int id, retval;
|
|
SEMUN s;
|
|
|
|
id = semget(key, 1, IPC_CREAT|IPC_EXCL|0777);
|
|
if (id < 0) {
|
|
return ERR_SEMGET;
|
|
}
|
|
memset(&s, 0, sizeof(s));
|
|
s.val = 1;
|
|
retval = semctl(id, 0, SETVAL, s);
|
|
if (retval) {
|
|
return ERR_SEMCTL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int destroy_semaphore(key_t key){
|
|
int id, retval;
|
|
id = semget(key, 0, 0);
|
|
if (id < 0) {
|
|
return ERR_SEMGET;
|
|
}
|
|
retval = semctl(id, 1, IPC_RMID, 0);
|
|
if (retval) {
|
|
return ERR_SEMCTL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int lock_semaphore(key_t key) {
|
|
struct sembuf s;
|
|
int id, retval;
|
|
|
|
id = semget(key, 0, 0);
|
|
if (id < 0) {
|
|
return ERR_SEMGET;
|
|
}
|
|
s.sem_num = 0;
|
|
s.sem_op = -1;
|
|
s.sem_flg = SEM_UNDO;
|
|
retval = semop(id, &s, 1);
|
|
if (retval) {
|
|
return ERR_SEMOP;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int unlock_semaphore(key_t key) {
|
|
struct sembuf s;
|
|
int id, retval;
|
|
|
|
id = semget(key, 0, 0);
|
|
if (id < 0) {
|
|
return ERR_SEMGET;
|
|
}
|
|
s.sem_num = 0;
|
|
s.sem_op = 1;
|
|
s.sem_flg = SEM_UNDO;
|
|
retval = semop(id, &s, 1);
|
|
if (retval) {
|
|
return ERR_SEMOP;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int get_key(char* path, int id, key_t& key) {
|
|
key = ftok(path, id);
|
|
if (key == (key_t)-1) return ERR_FTOK;
|
|
return 0;
|
|
}
|