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/*
* Copyright (C) 2010-2014 NXP Semiconductors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* DAL independent message queue implementation for Android (can be used under
* Linux too)
*/
#include <errno.h>
#include <linux/ipc.h>
#include <phDal4Nfc_messageQueueLib.h>
#include <phNxpLog.h>
#include <pthread.h>
#include <semaphore.h>
typedef struct phDal4Nfc_message_queue_item {
phLibNfc_Message_t nMsg;
struct phDal4Nfc_message_queue_item* pPrev;
struct phDal4Nfc_message_queue_item* pNext;
} phDal4Nfc_message_queue_item_t;
typedef struct phDal4Nfc_message_queue {
phDal4Nfc_message_queue_item_t* pItems;
pthread_mutex_t nCriticalSectionMutex;
sem_t nProcessSemaphore;
} phDal4Nfc_message_queue_t;
/*******************************************************************************
**
** Function phDal4Nfc_msgget
**
** Description Allocates message queue
**
** Parameters Ignored, included only for Linux queue API compatibility
**
** Returns (int) value of pQueue if successful
** -1, if failed to allocate memory or to init mutex
**
*******************************************************************************/
intptr_t phDal4Nfc_msgget(key_t key, int msgflg) {
phDal4Nfc_message_queue_t* pQueue;
UNUSED(key);
UNUSED(msgflg);
pQueue =
(phDal4Nfc_message_queue_t*)malloc(sizeof(phDal4Nfc_message_queue_t));
if (pQueue == NULL) return -1;
memset(pQueue, 0, sizeof(phDal4Nfc_message_queue_t));
if (pthread_mutex_init(&pQueue->nCriticalSectionMutex, NULL) == -1) {
free(pQueue);
return -1;
}
if (sem_init(&pQueue->nProcessSemaphore, 0, 0) == -1) {
free(pQueue);
return -1;
}
return ((intptr_t)pQueue);
}
/*******************************************************************************
**
** Function phDal4Nfc_msgrelease
**
** Description Releases message queue
**
** Parameters msqid - message queue handle
**
** Returns None
**
*******************************************************************************/
void phDal4Nfc_msgrelease(intptr_t msqid) {
phDal4Nfc_message_queue_t* pQueue = (phDal4Nfc_message_queue_t*)msqid;
if (pQueue != NULL) {
sem_post(&pQueue->nProcessSemaphore);
usleep(3000);
if (sem_destroy(&pQueue->nProcessSemaphore)) {
NXPLOG_TML_E("Failed to destroy semaphore (errno=0x%08x)", errno);
}
pthread_mutex_destroy(&pQueue->nCriticalSectionMutex);
free(pQueue);
}
return;
}
/*******************************************************************************
**
** Function phDal4Nfc_msgctl
**
** Description Destroys message queue
**
** Parameters msqid - message queue handle
** cmd, buf - ignored, included only for Linux queue API
** compatibility
**
** Returns 0, if successful
** -1, if invalid handle is passed
**
*******************************************************************************/
int phDal4Nfc_msgctl(intptr_t msqid, int cmd, void* buf) {
phDal4Nfc_message_queue_t* pQueue;
phDal4Nfc_message_queue_item_t* p;
UNUSED(cmd);
UNUSED(buf);
if (msqid == 0) return -1;
pQueue = (phDal4Nfc_message_queue_t*)msqid;
pthread_mutex_lock(&pQueue->nCriticalSectionMutex);
if (pQueue->pItems != NULL) {
p = pQueue->pItems;
while (p->pNext != NULL) {
p = p->pNext;
}
while (p->pPrev != NULL) {
p = p->pPrev;
free(p->pNext);
p->pNext = NULL;
}
free(p);
}
pQueue->pItems = NULL;
pthread_mutex_unlock(&pQueue->nCriticalSectionMutex);
pthread_mutex_destroy(&pQueue->nCriticalSectionMutex);
free(pQueue);
return 0;
}
/*******************************************************************************
**
** Function phDal4Nfc_msgsnd
**
** Description Sends a message to the queue. The message will be added at
** the end of the queue as appropriate for FIFO policy
**
** Parameters msqid - message queue handle
** msgp - message to be sent
** msgsz - message size
** msgflg - ignored
**
** Returns 0, if successful
** -1, if invalid parameter passed or failed to allocate memory
**
*******************************************************************************/
intptr_t phDal4Nfc_msgsnd(intptr_t msqid, phLibNfc_Message_t* msg, int msgflg) {
phDal4Nfc_message_queue_t* pQueue;
phDal4Nfc_message_queue_item_t* p;
phDal4Nfc_message_queue_item_t* pNew;
UNUSED(msgflg);
if ((msqid == 0) || (msg == NULL)) return -1;
pQueue = (phDal4Nfc_message_queue_t*)msqid;
pNew = (phDal4Nfc_message_queue_item_t*)malloc(
sizeof(phDal4Nfc_message_queue_item_t));
if (pNew == NULL) return -1;
memset(pNew, 0, sizeof(phDal4Nfc_message_queue_item_t));
memcpy(&pNew->nMsg, msg, sizeof(phLibNfc_Message_t));
pthread_mutex_lock(&pQueue->nCriticalSectionMutex);
if (pQueue->pItems != NULL) {
p = pQueue->pItems;
while (p->pNext != NULL) {
p = p->pNext;
}
p->pNext = pNew;
pNew->pPrev = p;
} else {
pQueue->pItems = pNew;
}
pthread_mutex_unlock(&pQueue->nCriticalSectionMutex);
sem_post(&pQueue->nProcessSemaphore);
return 0;
}
/*******************************************************************************
**
** Function phDal4Nfc_msgrcv
**
** Description Gets the oldest message from the queue.
** If the queue is empty the function waits (blocks on a mutex)
** until a message is posted to the queue with phDal4Nfc_msgsnd
**
** Parameters msqid - message queue handle
** msgp - message to be received
** msgsz - message size
** msgtyp - ignored
** msgflg - ignored
**
** Returns 0, if successful
** -1, if invalid parameter passed
**
*******************************************************************************/
int phDal4Nfc_msgrcv(intptr_t msqid, phLibNfc_Message_t* msg, long msgtyp,
int msgflg) {
phDal4Nfc_message_queue_t* pQueue;
phDal4Nfc_message_queue_item_t* p;
UNUSED(msgflg);
UNUSED(msgtyp);
if ((msqid == 0) || (msg == NULL)) return -1;
pQueue = (phDal4Nfc_message_queue_t*)msqid;
sem_wait(&pQueue->nProcessSemaphore);
pthread_mutex_lock(&pQueue->nCriticalSectionMutex);
if (pQueue->pItems != NULL) {
memcpy(msg, &(pQueue->pItems)->nMsg, sizeof(phLibNfc_Message_t));
p = pQueue->pItems->pNext;
free(pQueue->pItems);
pQueue->pItems = p;
}
pthread_mutex_unlock(&pQueue->nCriticalSectionMutex);
return 0;
}
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