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/*
* FreeRTOS V202111.00
* Copyright (C) Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* 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.
*
* https://www.FreeRTOS.org
* https://github.com/FreeRTOS
*
*/
#include "proof/queue.h"
/* It may seem that the read of `pxQueue->uxMessagesWaiting` is required to be
* contained in a critical region to be thread-safe. However, it is impossible for
* this read to be involved in a data race due to the atomicity mechanism used by
* tasks and ISRs: masking and enabling interrupts. If we assume (1) a
* uniprocessor system and (2) that higher priority ISRs never call queue API
* functions then masking interrupts ensures *strong isolation* meaning critical
* regions protected by interrupt masking/enabling are isolated from other
* critical regions and code outside of critical regions. */
UBaseType_t uxQueueMessagesWaitingFromISR( const QueueHandle_t xQueue )
/*@requires queue(xQueue, ?Storage, ?N, ?M, ?W, ?R, ?K, ?is_locked, ?abs);@*/
/*@ensures queue(xQueue, Storage, N, M, W, R, K, is_locked, abs) &*& result == K;@*/
{
UBaseType_t uxReturn;
#ifdef VERIFAST /*< const pointer declaration */
Queue_t * pxQueue = xQueue;
#else
Queue_t * const pxQueue = xQueue;
#endif
configASSERT( pxQueue );
uxReturn = pxQueue->uxMessagesWaiting;
return uxReturn;
}
UBaseType_t uxQueueMessagesWaiting( const QueueHandle_t xQueue )
/*@requires [1/2]queuehandle(xQueue, ?N, ?M, ?is_isr) &*& is_isr == false;@*/
/*@ensures [1/2]queuehandle(xQueue, N, M, is_isr);@*/
{
UBaseType_t uxReturn;
configASSERT( xQueue );
taskENTER_CRITICAL();
{
/*@assert queue(xQueue, ?Storage, N, M, ?W, ?R, ?K, ?is_locked, ?abs);@*/
uxReturn = ( ( Queue_t * ) xQueue )->uxMessagesWaiting;
/*@close queue(xQueue, Storage, N, M, W, R, K, is_locked, abs);@*/
}
taskEXIT_CRITICAL();
return uxReturn;
} /*lint !e818 Pointer cannot be declared const as xQueue is a typedef not pointer. */
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