mirror of https://github.com/BOINC/boinc.git
114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
// Berkeley Open Infrastructure for Network Computing
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// http://boinc.berkeley.edu
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// Copyright (C) 2005 University of California
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//
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// This is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation;
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// either version 2.1 of the License, or (at your option) any later version.
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//
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// This software is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU Lesser General Public License for more details.
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//
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// To view the GNU Lesser General Public License visit
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// http://www.gnu.org/copyleft/lesser.html
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// or write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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// interfaces for accessing sempahores
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#include "config.h"
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#include <cstdio>
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#include <cstring>
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#include "error_numbers.h"
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#include "synch.h"
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#ifdef _USING_FCGI_
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#include "fcgi_stdio.h"
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#endif
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union SEMUN {
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int val;
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struct semid_ds *buf;
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unsigned short int *arra;
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struct seminfo *__buf;
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};
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int create_semaphore(key_t key){
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int id, retval;
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SEMUN s;
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id = semget(key, 1, IPC_CREAT|IPC_EXCL|0777);
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if (id < 0) {
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return ERR_SEMGET;
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}
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memset(&s, 0, sizeof(s));
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s.val = 1;
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retval = semctl(id, 0, SETVAL, s);
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if (retval) {
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return ERR_SEMCTL;
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}
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return 0;
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}
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int destroy_semaphore(key_t key){
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int id, retval;
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id = semget(key, 0, 0);
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if (id < 0) {
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return ERR_SEMGET;
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}
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retval = semctl(id, 1, IPC_RMID, 0);
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if (retval) {
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return ERR_SEMCTL;
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}
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return 0;
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}
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int lock_semaphore(key_t key) {
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struct sembuf s;
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int id, retval;
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id = semget(key, 0, 0);
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if (id < 0) {
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return ERR_SEMGET;
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}
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s.sem_num = 0;
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s.sem_op = -1;
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s.sem_flg = SEM_UNDO;
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retval = semop(id, &s, 1);
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if (retval) {
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return ERR_SEMOP;
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}
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return 0;
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}
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int unlock_semaphore(key_t key) {
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struct sembuf s;
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int id, retval;
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id = semget(key, 0, 0);
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if (id < 0) {
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return ERR_SEMGET;
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}
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s.sem_num = 0;
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s.sem_op = 1;
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s.sem_flg = SEM_UNDO;
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retval = semop(id, &s, 1);
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if (retval) {
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return ERR_SEMOP;
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}
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return 0;
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}
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int get_key(char* path, int id, key_t& key) {
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key = ftok(path, id);
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if (key == (key_t)-1) return ERR_FTOK;
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return 0;
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}
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const char *BOINC_RCSID_9412b586d1 = "$Id$";
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