blackbeard420/esp-idf
1
0
Fork 0
mirror of https://github.com/espressif/esp-idf synced 2025-03-10 09:39:10 -04:00
Code Issues Projects Releases Wiki Activity

Merge branch 'fix/freertos_race_cond_in_stream_buffers' into 'master'

Browse Source 
fix(freertos): Fixed SMP race condition in stream_buffers.c

Closes IDF-11376

See merge request espressif/esp-idf!34130
This commit is contained in:
Sudeep Mohanty 2024-10-16 15:19:53 +08:00
commit 943103a4e2
2 changed files with 17 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
components/freertos/FreeRTOS-Kernel/idf_changes.md
View File

@ -123,6 +123,8 @@ The following functions were modified to accommodate SMP behavior:
- In SMP, the function now disables interrupts to ensure that the calling task does not switch cores while checking its own copy of `uxSchedulerSuspended`.
- `prvAddCurrentTaskToDelayedList()`
- Added extra check to see if current blocking task has already been deleted by the other core.
- `xStreamBufferReceive()`
- Added a critical section for setting `xTaskWaitingToReceive` to `NULL` so that the write is SMP safe.
### Critical Section Changes

18
components/freertos/FreeRTOS-Kernel/stream_buffer.c
View File

@ -6,7 +6,7 @@
*
* SPDX-License-Identifier: MIT
*
* SPDX-FileContributor: 2023 Espressif Systems (Shanghai) CO LTD
* SPDX-FileContributor: 2023-2024 Espressif Systems (Shanghai) CO LTD
*
* 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
@ -977,7 +977,19 @@ size_t xStreamBufferReceive( StreamBufferHandle_t xStreamBuffer,
/* Wait for data to be available. */
traceBLOCKING_ON_STREAM_BUFFER_RECEIVE( xStreamBuffer );
( void ) xTaskNotifyWait( ( uint32_t ) 0, ( uint32_t ) 0, NULL, xTicksToWait );
pxStreamBuffer->xTaskWaitingToReceive = NULL;
/* In SMP mode, the task may have been woken and scheduled on
* another core. Hence, we must clear the xTaskWaitingToReceive
* handle in a critical section. */
#if ( configNUMBER_OF_CORES > 1 )
taskENTER_CRITICAL( &( pxStreamBuffer->xStreamBufferLock ) );
#endif /* configNUMBER_OF_CORES > 1 */
{
pxStreamBuffer->xTaskWaitingToReceive = NULL;
}
#if ( configNUMBER_OF_CORES > 1 )
taskEXIT_CRITICAL( &( pxStreamBuffer->xStreamBufferLock ) );
#endif /* configNUMBER_OF_CORES > 1 */
/* Recheck the data available after blocking. */
xBytesAvailable = prvBytesInBuffer( pxStreamBuffer );
@ -1421,7 +1433,7 @@ static void prvInitialiseNewStreamBuffer( StreamBuffer_t * const pxStreamBuffer,
* result in confusion as to what is actually being observed. */
const BaseType_t xWriteValue = 0x55;
configASSERT( memset( pucBuffer, ( int ) xWriteValue, xBufferSizeBytes ) == pucBuffer );
(void)xWriteValue;
( void ) xWriteValue;
} /*lint !e529 !e438 xWriteValue is only used if configASSERT() is defined. */
#endif