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Allow interrupting GetMultiXactIdMembers
This function has a loop which can lead to uninterruptible process "stalls" (actually infinite loops) when some bugs are triggered. Avoid that unpleasant situation by adding a check for interrupts in a place that shouldn't degrade performance in the normal case. Backpatch to 9.3. Older branches have an identical loop here, but the aforementioned bugs are only a problem starting in 9.3 so there doesn't seem to be any point in backpatching any further.
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@ -1258,6 +1258,7 @@ retry:
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{
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/* Corner case 2: next multixact is still being filled in */
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LWLockRelease(MultiXactOffsetControlLock);
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CHECK_FOR_INTERRUPTS();
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pg_usleep(1000L);
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goto retry;
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}
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