mirror of
https://github.com/stargieg/bacnet-stack
synced 2025-10-26 23:35:52 +08:00
115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
/**
|
|
* @file
|
|
* @author Andriy Sukhynyuk, Vasyl Tkhir, Andriy Ivasiv
|
|
* @date 2012
|
|
* @brief Message queue module
|
|
*
|
|
* @section LICENSE
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included
|
|
* in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
|
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
*/
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <pthread.h>
|
|
#include "msgqueue.h"
|
|
|
|
pthread_mutex_t msg_lock = PTHREAD_MUTEX_INITIALIZER;
|
|
|
|
MSGBOX_ID create_msgbox(
|
|
)
|
|
{
|
|
MSGBOX_ID msgboxid;
|
|
|
|
msgboxid = msgget(IPC_PRIVATE, 0666 | IPC_CREAT);
|
|
if (msgboxid == INVALID_MSGBOX_ID) {
|
|
return INVALID_MSGBOX_ID;
|
|
}
|
|
|
|
return msgboxid;
|
|
}
|
|
|
|
bool send_to_msgbox(
|
|
MSGBOX_ID dest,
|
|
BACMSG * msg)
|
|
{
|
|
|
|
int err;
|
|
|
|
err = msgsnd(dest, msg, sizeof(BACMSG)-sizeof(MSGTYPE), 0);
|
|
if (err) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
BACMSG *recv_from_msgbox(
|
|
MSGBOX_ID src,
|
|
BACMSG * msg)
|
|
{
|
|
|
|
int recv_bytes;
|
|
|
|
recv_bytes = msgrcv(src, msg, sizeof(BACMSG)-sizeof(MSGTYPE), 0, IPC_NOWAIT);
|
|
if (recv_bytes > 0) {
|
|
return msg;
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
void del_msgbox(
|
|
MSGBOX_ID msgboxid)
|
|
{
|
|
|
|
if (msgboxid == INVALID_MSGBOX_ID)
|
|
return;
|
|
else
|
|
msgctl(msgboxid, IPC_RMID, NULL);
|
|
}
|
|
|
|
void free_data(
|
|
MSG_DATA * data)
|
|
{
|
|
|
|
if (data->pdu) {
|
|
free(data->pdu);
|
|
data->pdu = NULL;
|
|
}
|
|
if (data) {
|
|
free(data);
|
|
data = NULL;
|
|
}
|
|
}
|
|
|
|
void check_data(
|
|
MSG_DATA * data)
|
|
{
|
|
|
|
/* lock and decrement messages reference count */
|
|
pthread_mutex_lock(&msg_lock);
|
|
if (--data->ref_count == 0) {
|
|
free_data(data);
|
|
}
|
|
pthread_mutex_unlock(&msg_lock);
|
|
}
|