mirror of https://github.com/BOINC/boinc.git
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
// The contents of this file are subject to the BOINC Public License
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// Version 1.0 (the "License"); you may not use this file except in
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// compliance with the License. You may obtain a copy of the License at
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// http://boinc.berkeley.edu/license_1.0.txt
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//
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// Software distributed under the License is distributed on an "AS IS"
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// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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// License for the specific language governing rights and limitations
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// under the License.
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//
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// The Original Code is the Berkeley Open Infrastructure for Network Computing.
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//
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// The Initial Developer of the Original Code is the SETI@home project.
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// Portions created by the SETI@home project are Copyright (C) 2002
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// University of California at Berkeley. All Rights Reserved.
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//
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// Contributor(s):
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//
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// interfaces for accessing message queues
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#include <cstdio>
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#include <cstring>
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#include "msg_queue.h"
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int create_message_queue(key_t key) {
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int mq_id;
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mq_id = msgget(key, IPC_CREAT | IPC_EXCL | 0666);
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if (mq_id < 0) {
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perror("create_message_queue: msgget");
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return -1;
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}
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return 0;
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}
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int receive_message(key_t key, void *msg, size_t msg_size, bool wait) {
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int mq_id, retval;
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mq_id = msgget(key, 0666);
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if (mq_id < 0) {
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perror("receive_message: msgget");
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return -1;
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}
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retval = msgrcv(mq_id, msg, msg_size, 0, (wait?0:IPC_NOWAIT));
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if (retval < 0) {
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perror("receive_message: msgrcv");
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return -1;
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}
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return 0;
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}
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int send_message(key_t key, void *msg, size_t msg_size, bool wait) {
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int mq_id, retval;
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mq_id = msgget(key, 0666);
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if (mq_id < 0) {
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perror("send_message: msgget");
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return -1;
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}
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retval = msgsnd(mq_id, msg, msg_size, (wait?0:IPC_NOWAIT));
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if (retval < 0) {
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perror("send_message: msgsnd");
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return -1;
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}
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return 0;
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}
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int destroy_message_queue(key_t key) {
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int mq_id, retval;
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mq_id = msgget(key, 0666);
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if (mq_id < 0) {
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perror("delete_message_queue: msgget");
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return -1;
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}
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retval = msgctl(mq_id, IPC_RMID, NULL);
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if (retval) {
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perror("delete_message_queue: msgctl");
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return -1;
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}
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return 0;
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}
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