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Fix hang in ExecutionDelete #5707

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Fix hang in ExecutionDelete #5707

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89f623e
Drain Work Queues in ExecutionDelete
anrossi Dec 18, 2025
b4c324d
Wrap debug variable in debug checks
anrossi Dec 18, 2025
231abf1
Refactor
anrossi Jan 9, 2026
544ca9d
Create cleanup threads and transfer workers to run on them
anrossi Jan 10, 2026
e00e0c6
Cleanup event on uninitialize. Update comment.
anrossi Jan 12, 2026
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57 changes: 57 additions & 0 deletions src/platform/platform_worker.c
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Original file line number Diff line number Diff line change
Expand Up @@ -160,6 +160,16 @@ UpdatePollCompletion(
CxPlatUpdateExecutionContexts(Worker);
}

void
CxPlatWorkerPoolWorkerDrainEvents(
_In_ CXPLAT_WORKER* Worker
);

void
CxPlatProcessEvents(
_In_ CXPLAT_WORKER* Worker
);

BOOLEAN
CxPlatWorkerPoolInitWorker(
_Inout_ CXPLAT_WORKER* Worker,
Expand Down Expand Up @@ -449,6 +459,17 @@ CxPlatWorkerPoolDelete(
#else
UNREFERENCED_PARAMETER(RefType);
#endif

if (RefType == CXPLAT_WORKER_POOL_REF_EXTERNAL) {
//
// In the case of external execution, it's possible for ExecutionDelete
// to run before all the queues have been drained of internal cleanup work.
// Run all the workers until there's nothing left to do here.
//
for (uint32_t i = 0; i < WorkerPool->WorkerCount; ++i) {
CxPlatWorkerPoolWorkerDrainEvents(&WorkerPool->Workers[i]);
}
}
CxPlatRundownReleaseAndWait(&WorkerPool->Rundown);

#if DEBUG
Expand Down Expand Up @@ -666,6 +687,42 @@ CxPlatWorkerPoolWorkerPoll(
return Worker->State.WaitTime;
}

void
CxPlatWorkerPoolWorkerDrainEvents(
_In_ CXPLAT_WORKER* Worker
)
{
#if DEBUG
uint32_t Iterations = 0;
#endif
do {
Worker->State.TimeNow = CxPlatTimeUs64();
Worker->State.ThreadID = CxPlatCurThreadID();

CxPlatRunExecutionContexts(Worker);
if (Worker->State.WaitTime && InterlockedFetchAndClearBoolean(&Worker->Running)) {
Worker->State.TimeNow = CxPlatTimeUs64();
CxPlatRunExecutionContexts(Worker); // Run once more to handle race conditions
}

//
// Set the wait time to zero here to process as soon as possible.
// Otherwise, CxPlatProcessEvents may wait this many milliseconds.
//
Worker->State.WaitTime = 0;

//
// Assume there is no work to do, and this will update to zero if work was done.
//
Worker->State.NoWorkCount = 1;
CxPlatProcessEvents(Worker);

#if DEBUG
CXPLAT_DBG_ASSERTMSG(++Iterations < 10, "Is the library still active?");
#endif
} while (Worker->State.NoWorkCount == 0);
}

#define DYNAMIC_POOL_PROCESSING_PERIOD 1000000 // 1 second
#define DYNAMIC_POOL_PRUNE_COUNT 8

Expand Down
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