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Pend a yield in portPRE_TASK_DELETE_HOOK

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When a task deletes itself, it calls portPRE_TASK_DELETE_HOOK which
translates to vPortCloseRunningThread on the Windows port.
vPortCloseRunningThread never returns and as a result,
taskYIELD_WITHIN_API in vTaskDelete does not get called. As a result,
the next task is not scheduled when configUSE_PREEMPTION is set to 0.

This change records that a yield is pending so that the next tick
interrupt switches out the task that was deleted.

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>
This commit is contained in:
Gaurav Aggarwal 2024-08-29 17:06:20 +05:30
parent e6d8308fde
commit 4d7b2f6685
1 changed files with 14 additions and 0 deletions
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14
portable/MSVC-MingW/port.c
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@ -547,6 +547,20 @@ void vPortCloseRunningThread( void * pvTaskToDelete,
/* This is called from a critical section, which must be exited before the
* thread stops. */
taskEXIT_CRITICAL();
/* Record that a yield is pending so that the next tick interrupt switches
* out this thread regardless of the value of configUSE_PREEMPTION. This is
* needed when a task deletes itself - the taskYIELD_WITHIN_API within
* vTaskDelete does not get called because this function never returns. If
* we do not pend portINTERRUPT_YIELD here, the next task is not scheduled
* when configUSE_PREEMPTION is set to 0. */
if( pvInterruptEventMutex != NULL )
{
WaitForSingleObject( pvInterruptEventMutex, INFINITE );
ulPendingInterrupts |= ( 1 << portINTERRUPT_YIELD );
ReleaseMutex( pvInterruptEventMutex );
}
CloseHandle( pxThreadState->pvYieldEvent );
ExitThread( 0 );
}