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OpenOCD Support: Re-introduce uxTopUsedPriority (#188)

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* re-introduce uxTopUsedPriority. Prevent removal by optimization

* Make uxTopUsedPriority volatile to avoid optimizer + code comment

Co-authored-by: Cobus van Eeden <35851496+cobusve@users.noreply.github.com>
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David Chalco 2020-10-01 12:40:21 -07:00 committed by GitHub
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commit b1307dbea8
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tasks.c
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@ -379,6 +379,11 @@ PRIVILEGED_DATA static UBaseType_t uxTaskNumber = ( UBaseType_t ) 0U;
PRIVILEGED_DATA static volatile TickType_t xNextTaskUnblockTime = ( TickType_t ) 0U; /* Initialised to portMAX_DELAY before the scheduler starts. */
PRIVILEGED_DATA static TaskHandle_t xIdleTaskHandle = NULL; /*< Holds the handle of the idle task. The idle task is created automatically when the scheduler is started. */
/* Improve support for OpenOCD. The kernel tracks Ready tasks via priority lists.
* For tracking the state of remote threads, OpenOCD uses uxTopUsedPriority
* to determine the number of priority lists to read back from the remote target. */
const volatile UBaseType_t uxTopUsedPriority = configMAX_PRIORITIES - 1U;
/* Context switches are held pending while the scheduler is suspended. Also,
* interrupts must not manipulate the xStateListItem of a TCB, or any of the
* lists the xStateListItem can be referenced from, if the scheduler is suspended.
@ -2093,6 +2098,10 @@ void vTaskStartScheduler( void )
/* Prevent compiler warnings if INCLUDE_xTaskGetIdleTaskHandle is set to 0,
* meaning xIdleTaskHandle is not used anywhere else. */
( void ) xIdleTaskHandle;
/* OpenOCD makes use of uxTopUsedPriority for thread debugging. Prevent uxTopUsedPriority
* from getting optimized out as it is no longer used by the kernel. */
( void ) uxTopUsedPriority;
}
/*-----------------------------------------------------------*/