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// Berkeley Open Infrastructure for Network Computing
// http://boinc.berkeley.edu
// Copyright (C) 2005 University of California
//
// This is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation;
// either version 2.1 of the License, or (at your option) any later version.
//
// This software is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// To view the GNU Lesser General Public License visit
// http://www.gnu.org/copyleft/lesser.html
// or write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// interfaces for accessing message queues
#include "config.h"
#include <cstdio>
#include <cstring>
#include "msg_queue.h"
int create_message_queue(key_t key) {
int mq_id;
mq_id = msgget(key, IPC_CREAT | IPC_EXCL | 0666);
if (mq_id < 0) {
perror("create_message_queue: msgget");
return -1;
}
return 0;
}
int receive_message(key_t key, void *msg, size_t msg_size, bool wait) {
int mq_id, retval;
mq_id = msgget(key, 0666);
if (mq_id < 0) {
perror("receive_message: msgget");
return -1;
}
retval = msgrcv(mq_id, msg, msg_size, 0, (wait?0:IPC_NOWAIT));
if (retval < 0) {
perror("receive_message: msgrcv");
return -1;
}
return 0;
}
int send_message(key_t key, void *msg, size_t msg_size, bool wait) {
int mq_id, retval;
mq_id = msgget(key, 0666);
if (mq_id < 0) {
perror("send_message: msgget");
return -1;
}
retval = msgsnd(mq_id, msg, msg_size, (wait?0:IPC_NOWAIT));
if (retval < 0) {
perror("send_message: msgsnd");
return -1;
}
return 0;
}
int destroy_message_queue(key_t key) {
int mq_id, retval;
mq_id = msgget(key, 0666);
if (mq_id < 0) {
perror("delete_message_queue: msgget");
return -1;
}
retval = msgctl(mq_id, IPC_RMID, NULL);
if (retval) {
perror("delete_message_queue: msgctl");
return -1;
}
return 0;
}
const char *BOINC_RCSID_7b5e8a534b = "$Id: msg_queue.C,v 1.8 2005/11/21 18:34:28 korpela Exp $";
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