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Return the lock counts to their original intended behaviour.

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This commit is contained in:
Richard Barry 2008-03-29 20:50:38 +00:00
parent 9596b04eff
commit 3fd422ff2f
1 changed files with 37 additions and 19 deletions
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52
Source/queue.c
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@ -58,7 +58,9 @@
*----------------------------------------------------------*/
/* Constants used with the cRxLock and cTxLock structure members. */
#define queueUNLOCKED ( ( signed portBASE_TYPE ) -1 )
#define queueUNLOCKED ( ( signed portBASE_TYPE ) -1 )
#define queueLOCKED_UNMODIFIED ( ( signed portBASE_TYPE ) 0 )
#define queueERRONEOUS_UNBLOCK ( -1 )
/* For internal use only. */
@ -177,12 +179,20 @@ static void prvCopyDataFromQueue( xQUEUE * const pxQueue, const void *pvBuffer )
* Macro to mark a queue as locked. Locking a queue prevents an ISR from
* accessing the queue event lists.
*/
#define prvLockQueue( pxQueue ) \
{ \
taskENTER_CRITICAL(); \
++( pxQueue->xRxLock ); \
++( pxQueue->xTxLock ); \
taskEXIT_CRITICAL(); \
#define prvLockQueue( pxQueue ) \
{ \
taskENTER_CRITICAL(); \
{ \
if( pxQueue->xRxLock == queueUNLOCKED ) \
{ \
pxQueue->xRxLock = queueLOCKED_UNMODIFIED; \
} \
if( pxQueue->xTxLock == queueUNLOCKED ) \
{ \
pxQueue->xTxLock = queueLOCKED_UNMODIFIED; \
} \
} \
taskEXIT_CRITICAL(); \
}
/*-----------------------------------------------------------*/
@ -1134,13 +1144,9 @@ static void prvUnlockQueue( xQueueHandle pxQueue )
updated. */
taskENTER_CRITICAL();
{
--( pxQueue->xTxLock );
/* See if data was added to the queue while it was locked. */
if( pxQueue->xTxLock > queueUNLOCKED )
while( pxQueue->xTxLock > queueLOCKED_UNMODIFIED )
{
pxQueue->xTxLock = queueUNLOCKED;
/* Data was posted while the queue was locked. Are any tasks
blocked waiting for data to become available? */
if( !listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) )
@ -1153,28 +1159,40 @@ static void prvUnlockQueue( xQueueHandle pxQueue )
context switch is required. */
vTaskMissedYield();
}
--( pxQueue->xTxLock );
}
else
{
break;
}
}
pxQueue->xTxLock = queueUNLOCKED;
}
taskEXIT_CRITICAL();
/* Do the same for the Rx lock. */
taskENTER_CRITICAL();
{
--( pxQueue->xRxLock );
if( pxQueue->xRxLock > queueUNLOCKED )
while( pxQueue->xRxLock > queueLOCKED_UNMODIFIED )
{
pxQueue->xRxLock = queueUNLOCKED;
if( !listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) )
{
if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) != pdFALSE )
{
vTaskMissedYield();
}
--( pxQueue->xRxLock );
}
else
{
break;
}
}
pxQueue->xRxLock = queueUNLOCKED;
}
taskEXIT_CRITICAL();
}