mirror of
https://github.com/stargieg/bacnet-stack
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103 lines
2.1 KiB
C
103 lines
2.1 KiB
C
/*
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Copyright (C) 2012 Andriy Sukhynyuk, Vasyl Tkhir, Andriy Ivasiv
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include "msgqueue.h"
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pthread_mutex_t msg_lock = PTHREAD_MUTEX_INITIALIZER;
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MSGBOX_ID create_msgbox(
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)
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{
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MSGBOX_ID msgboxid;
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msgboxid = msgget(IPC_PRIVATE, 0666 | IPC_CREAT);
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if (msgboxid == INVALID_MSGBOX_ID) {
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return INVALID_MSGBOX_ID;
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}
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return msgboxid;
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}
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bool send_to_msgbox(
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MSGBOX_ID dest,
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BACMSG * msg)
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{
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int err;
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err = msgsnd(dest, msg, sizeof(BACMSG), 0);
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if (err) {
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return false;
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}
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return true;
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}
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BACMSG *recv_from_msgbox(
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MSGBOX_ID src,
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BACMSG * msg)
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{
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int recv_bytes;
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recv_bytes = msgrcv(src, msg, sizeof(BACMSG), 0, IPC_NOWAIT);
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if (recv_bytes > 0) {
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return msg;
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} else {
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return NULL;
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}
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}
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void del_msgbox(
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MSGBOX_ID msgboxid)
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{
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if (msgboxid == INVALID_MSGBOX_ID)
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return;
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else
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msgctl(msgboxid, IPC_RMID, NULL);
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}
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void free_data(
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MSG_DATA * data)
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{
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if (data->pdu) {
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free(data->pdu);
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data->pdu = NULL;
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}
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if (data) {
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free(data);
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data = NULL;
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}
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}
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void check_data(
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MSG_DATA * data)
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{
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/* lock and decrement messages reference count */
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pthread_mutex_lock(&msg_lock);
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if (--data->ref_count == 0) {
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free_data(data);
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}
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pthread_mutex_unlock(&msg_lock);
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}
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