FreeRTOS synchronization primitives (e.g., queues, eventgroups) use various event lists (i.e., task lists) to track what
tasks are blocked on a current primitive. Usually these event lists are accessed via one of the event lists functions
(such as vTask[PlaceOn|RemoveFrom]UnorderedEventList()), which in turn ensure that the global task list spinlock
(xTaskQueueMutex) is taken when accessing these lists.
However, some functions in event_groups.c manually traverse their event lists. Thus if a tick interrupt occurs on
another core during traversal and that tick interrupt unblocks a task on the event list being traversed, the event list
will be corrupted.
This commit modifies the following event_groups.c functions so that they take the global task list lock before
traversing their event list.
- xEventGroupSetBits()
- vEventGroupDelete()
This commit backports the following features from FreeRTOS v9.0.0
- uxSemaphoreGetCount()
- vTimerSetTimerId(), xTimerGetPeriod(), xTimerGetExpiryTime()
- xTimerCreateStatic()
- xEventGroupCreateStatic()
- uxSemaphoreGetCount()
Functions backported previously
- xTaskCreateStatic()
- xQueueCreateStatic()
- xSemaphoreCreateBinaryStatic(), xSemaphoreCreateCountingStatic()
- xSemaphoreCreateMutexStatic(), xSemaphoreCreateRecursiveMutexStatic()
- pcQueueGetName()
- vTaskSetThreadLocalStoragePointer()
- pvTaskGetThreadLocalStoragePointer()
Unit tests were also written for the functions above (except for pcQueueGetName
which is tested in a separate Queue Registry MR). The original tlsp and del cb test case
was deleted and integrated into the test cases of this MR.
