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#include "wilc_msgqueue.h"
#include <linux/spinlock.h>
/*!
* @author syounan
* @date 1 Sep 2010
* @note copied from FLO glue implementatuion
* @version 1.0
*/
WILC_ErrNo WILC_MsgQueueCreate(WILC_MsgQueueHandle *pHandle)
{
spin_lock_init(&pHandle->strCriticalSection);
sema_init(&pHandle->hSem, 0);
pHandle->pstrMessageList = NULL;
pHandle->u32ReceiversCount = 0;
pHandle->bExiting = false;
return WILC_SUCCESS;
}
/*!
* @author syounan
* @date 1 Sep 2010
* @note copied from FLO glue implementatuion
* @version 1.0
*/
WILC_ErrNo WILC_MsgQueueDestroy(WILC_MsgQueueHandle *pHandle)
{
pHandle->bExiting = true;
/* Release any waiting receiver thread. */
while (pHandle->u32ReceiversCount > 0) {
up(&(pHandle->hSem));
pHandle->u32ReceiversCount--;
}
while (pHandle->pstrMessageList != NULL) {
Message *pstrMessge = pHandle->pstrMessageList->pstrNext;
kfree(pHandle->pstrMessageList);
pHandle->pstrMessageList = pstrMessge;
}
return WILC_SUCCESS;
}
/*!
* @author syounan
* @date 1 Sep 2010
* @note copied from FLO glue implementatuion
* @version 1.0
*/
WILC_ErrNo WILC_MsgQueueSend(WILC_MsgQueueHandle *pHandle,
const void *pvSendBuffer, u32 u32SendBufferSize)
{
WILC_ErrNo s32RetStatus = WILC_SUCCESS;
unsigned long flags;
Message *pstrMessage = NULL;
if ((pHandle == NULL) || (u32SendBufferSize == 0) || (pvSendBuffer == NULL)) {
WILC_ERRORREPORT(s32RetStatus, WILC_INVALID_ARGUMENT);
}
if (pHandle->bExiting == true) {
WILC_ERRORREPORT(s32RetStatus, WILC_FAIL);
}
spin_lock_irqsave(&pHandle->strCriticalSection, flags);
/* construct a new message */
pstrMessage = kmalloc(sizeof(Message), GFP_ATOMIC);
WILC_NULLCHECK(s32RetStatus, pstrMessage);
pstrMessage->u32Length = u32SendBufferSize;
pstrMessage->pstrNext = NULL;
pstrMessage->pvBuffer = WILC_MALLOC(u32SendBufferSize);
WILC_NULLCHECK(s32RetStatus, pstrMessage->pvBuffer);
memcpy(pstrMessage->pvBuffer, pvSendBuffer, u32SendBufferSize);
/* add it to the message queue */
if (pHandle->pstrMessageList == NULL) {
pHandle->pstrMessageList = pstrMessage;
} else {
Message *pstrTailMsg = pHandle->pstrMessageList;
while (pstrTailMsg->pstrNext != NULL) {
pstrTailMsg = pstrTailMsg->pstrNext;
}
pstrTailMsg->pstrNext = pstrMessage;
}
spin_unlock_irqrestore(&pHandle->strCriticalSection, flags);
up(&pHandle->hSem);
WILC_CATCH(s32RetStatus)
{
/* error occured, free any allocations */
if (pstrMessage != NULL) {
if (pstrMessage->pvBuffer != NULL) {
kfree(pstrMessage->pvBuffer);
}
kfree(pstrMessage);
}
}
return s32RetStatus;
}
/*!
* @author syounan
* @date 1 Sep 2010
* @note copied from FLO glue implementatuion
* @version 1.0
*/
WILC_ErrNo WILC_MsgQueueRecv(WILC_MsgQueueHandle *pHandle,
void *pvRecvBuffer, u32 u32RecvBufferSize,
u32 *pu32ReceivedLength)
{
Message *pstrMessage;
WILC_ErrNo s32RetStatus = WILC_SUCCESS;
unsigned long flags;
if ((pHandle == NULL) || (u32RecvBufferSize == 0)
|| (pvRecvBuffer == NULL) || (pu32ReceivedLength == NULL)) {
WILC_ERRORREPORT(s32RetStatus, WILC_INVALID_ARGUMENT);
}
if (pHandle->bExiting == true) {
WILC_ERRORREPORT(s32RetStatus, WILC_FAIL);
}
spin_lock_irqsave(&pHandle->strCriticalSection, flags);
pHandle->u32ReceiversCount++;
spin_unlock_irqrestore(&pHandle->strCriticalSection, flags);
down(&(pHandle->hSem));
if (s32RetStatus == WILC_TIMEOUT) {
/* timed out, just exit without consumeing the message */
spin_lock_irqsave(&pHandle->strCriticalSection, flags);
pHandle->u32ReceiversCount--;
spin_unlock_irqrestore(&pHandle->strCriticalSection, flags);
} else {
/* other non-timeout scenarios */
WILC_ERRORCHECK(s32RetStatus);
if (pHandle->bExiting) {
WILC_ERRORREPORT(s32RetStatus, WILC_FAIL);
}
spin_lock_irqsave(&pHandle->strCriticalSection, flags);
pstrMessage = pHandle->pstrMessageList;
if (pstrMessage == NULL) {
spin_unlock_irqrestore(&pHandle->strCriticalSection, flags);
WILC_ERRORREPORT(s32RetStatus, WILC_FAIL);
}
/* check buffer size */
if (u32RecvBufferSize < pstrMessage->u32Length) {
spin_unlock_irqrestore(&pHandle->strCriticalSection, flags);
up(&pHandle->hSem);
WILC_ERRORREPORT(s32RetStatus, WILC_BUFFER_OVERFLOW);
}
/* consume the message */
pHandle->u32ReceiversCount--;
memcpy(pvRecvBuffer, pstrMessage->pvBuffer, pstrMessage->u32Length);
*pu32ReceivedLength = pstrMessage->u32Length;
pHandle->pstrMessageList = pstrMessage->pstrNext;
kfree(pstrMessage->pvBuffer);
kfree(pstrMessage);
spin_unlock_irqrestore(&pHandle->strCriticalSection, flags);
}
WILC_CATCH(s32RetStatus)
{
}
return s32RetStatus;
}
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