Event Groups: snapshot xEventGroupSetBits returning value while in vTaskSuspendAll

[skotopes]

Event Groups: snapshot xEventGroupSetBits returning value while in vTaskSuspendAll

Description

Event Groups: snapshot xEventGroupSetBits returning value while in vTaskSuspendAll.
Fixes uxEventBits dereference after event group deleted by higher priority thread.

Test Steps

Code example that causes issues: https://github.com/flipperdevices/flipperzero-firmware/blob/78c5dd95d867941206e1be2fd3585c9c76132bd7/furi/core/timer.c#L43

General flow to reproduce issue:

• In High Priority Thread:
  • Place StaticEventGroup_t on stack and initialize
  • Call xTimerPendFunctionCall, pass reference to callback and event group handler
  • Call xEventGroupWaitBits
  • Delete Event Group
• In callback(which will be executed in timer thread):
  • use xEventGroupSetBits
  • check returned result

Previously return results was not guaranteed because High Priority Thread deleted EventGroup before uxEventBits dereference.
In this PR result will be as described in documentation.

Checklist:

• I have tested my changes. No regression in existing tests.
• I have modified and/or added unit-tests to cover the code changes in this Pull Request.

Related Issue

#1142

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[skotopes]

@aggarg Do I need to contribute unit tests to https://github.com/FreeRTOS/FreeRTOS first?

[aggarg]

Please merge main to fix the CI failure.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud