990643ebe8
* Fix support for stepping maximum number of ticks This commit fixes support for tickless implementations that call vTaskStepTick() with the maximum number of allowed ticks to step. vTaskStepTick() --------------- Function vTaskStepTick() provides a way for the tickless idle implementation to account for ticks that elapse during tickless idle. The maximum number of stepped ticks allowed is the number passed to portSUPPRESS_TICKS_AND_SLEEP(). It is the number of ticks between xTickCount and xNextTaskUnblockTime. vTaskStepTick() is specifically intended for use with tickless idle, so it always executes with the scheduler disabled. For reference, compare it with the more general function xTaskCatchUpTicks(). Without this Change ------------------- Prior to this commit, if a task is supposed to wake at xTickCount == 0xFFFFFFFF, then when tickless idle ends, function vTaskStepTick() sets the tick to 0xFFFFFFFF but the task remains on the delayed list because xTaskIncrementTick() does not execute. One tick later, xTaskIncrementTick() executes because it's time to increment xTickCount to 0x00000000. An assertion failure occurs in taskSWITCH_DELAYED_LISTS() because the delayed task list is not empty. Other examples of valling vTaskStepTick() with the maximum allowed number of ticks merely result in a task waking one tick late. Default Tickless Implementations -------------------------------- Note that the default tickless implementations never pass the maximum allowed value to vTaskStepTick(). The default implementations use the tick interrupt to finish the sleep and allow that one tick to be counted normally via the tick ISR and xTaskIncrementTick(). * Protect xPendedTicks with critical section Function xTaskIncrementTick() increments xPendedTicks when the scheduler is disabled. That function typically executes inside the tick ISR. So code in xTaskCatchUpTicks() must mask interrupts when modifying xPendedTicks. * uncrustify tasks.c * Update tasks.c Style changes only - added comment and indentation to the two modified files. * uncrustify * Add test coverage for new conditional * Add typecast Co-authored-by: Cobus van Eeden <35851496+cobusve@users.noreply.github.com> Co-authored-by: Joseph Julicher <jjulicher@mac.com> Co-authored-by: RichardBarry <3073890+RichardBarry@users.noreply.github.com> |
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| .. | ||
| atomic.h | ||
| croutine.h | ||
| deprecated_definitions.h | ||
| event_groups.h | ||
| FreeRTOS.h | ||
| list.h | ||
| message_buffer.h | ||
| mpu_prototypes.h | ||
| mpu_wrappers.h | ||
| portable.h | ||
| projdefs.h | ||
| queue.h | ||
| semphr.h | ||
| stack_macros.h | ||
| StackMacros.h | ||
| stdint.readme | ||
| stream_buffer.h | ||
| task.h | ||
| timers.h | ||