Fix #295 and #480, Resolve app table scanning race conditions #598
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Create a new background job to handle the maintenance tasks that had been performed in the ES main task as part of the CFE_ES_ScanAppTable() routine. All app state changes, including those invoked by messages, are now handled by this job. This also slightly changes the semantics of CFE_ES_RunLoop and CFE_ES_ExitApp. Now, the CFE_ES_RunLoop routine no longer requires a RunStatus buffer. Instead, the only thing that matters is the RunStatus value that is eventually passed to CFE_ES_ExitApp after the shutdown is complete. This should be mostly backward compatible, as the recommended app pattern would pass the same value to both functions. This commit also fixes nasa#480, as the value passed to CFE_ES_ExitApp will not override a request that was already pending.
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Describe the contribution
Fixes #295
Fixes #480
Partially addresses #567 - runloop now increments task counter instead of main app execution counter
Create a new background job to handle the maintenance tasks that had been performed in the ES main task as part of the
CFE_ES_ScanAppTable()routine.All app state changes, including those invoked by messages, are now handled by this job.
This also slightly changes the semantics of CFE_ES_RunLoop and CFE_ES_ExitApp. Now, the CFE_ES_RunLoop routine no longer requires a RunStatus buffer. Instead, the only thing that matters is the RunStatus value that is eventually passed to CFE_ES_ExitApp after the shutdown is complete. This should be mostly backward compatible, as the recommended app pattern would pass the same value to both functions.
This commit also fixes #480, as the value passed to CFE_ES_ExitApp will not override a request that was already pending.
Testing performed
Build with ENABLE_UNIT_TESTS=TRUE for native (x86-64 Linux) and RTEMS (i686-rtems4.11)
Expected behavior changes
No impact to CMD/TLM interface or API. Internal changes only.
System(s) tested on
Additional context
This reuses the background task concept introduced in pull #595. Will rebase this changeset as soon as that pull request makes it into a stable baseline.
Contributor Info - All information REQUIRED for consideration of pull request
Joseph Hickey, Vantage Systems Inc.