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Keep the mark chunk pop locks exclusive #1407

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Keep the mark chunk pop locks exclusive #1407

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6 changes: 6 additions & 0 deletions src/hx/gc/Immix.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1655,6 +1655,9 @@ struct GlobalChunks
int expected{ 0 };
while(false == processListPopLock.compare_exchange_strong(expected, 1))
{
// A failed exchange stores the current value in expected; without this the next
// attempt would compare against 1 and take a lock another thread still holds.
expected = 0;
// Spin
#ifdef PROFILE_THREAD_USAGE
sSpinCount++;
Expand Down Expand Up @@ -1739,6 +1742,9 @@ struct GlobalChunks
int expected{ 0 };
while(false == freeListPopLock.compare_exchange_strong(expected, 1))
{
// A failed exchange stores the current value in expected; without this the next
// attempt would compare against 1 and take a lock another thread still holds.
expected = 0;
// Spin
#ifdef PROFILE_THREAD_USAGE
sSpinCount++;
Expand Down