Kari Argillander
cb243c36a8
* Change MIT license texts to SPDX-License-Identifier SPDX-License-Identifier is much easier to understand and grep than license text so use that instead. * Change GPL exception license texts to SPDX-License-Identifier SPDX-License-Identifier is much easier to understand and grep than license text so use that instead. * Change misc license texts to SPDX-License-Identifier There are some external code in repo which are not licenses as most of the stuff in this repo. We still want every file to have SPDX identifier to easily grep licenses. * Add currently used license files Even though Bacnet-Stack is using SPDX identifiers we still need to give those license files with source. For this reason add all license files to license/ folder. SPDX has also files which would make same thing but this is style which example Linux kernel is using and it is quite clear so I choose that one for now. I choosed not yet bring CC-PDDC as that is not right license for those files. --------- Co-authored-by: Kari Argillander <kari.argillander@fidelix.com>
85 lines
1.5 KiB
C
85 lines
1.5 KiB
C
/**
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* @file
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* @author Andriy Sukhynyuk, Vasyl Tkhir, Andriy Ivasiv
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* @date 2012
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* @brief Message queue module
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*
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* @section LICENSE
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*
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* SPDX-License-Identifier: MIT
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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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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(MSGBOX_ID dest, BACMSG *msg)
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{
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int err;
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err = msgsnd(dest, msg, sizeof(BACMSG) - sizeof(MSGTYPE), 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(MSGBOX_ID src, BACMSG *msg, int flags)
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{
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int recv_bytes;
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recv_bytes = msgrcv(src, msg, sizeof(BACMSG) - sizeof(MSGTYPE), 0, flags);
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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(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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}
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void free_data(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(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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