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Commit6057f61

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Small improvements in comments in async.c.
We seem to have lost a line somewhere along the way in the comment blockthat discusses async.c's locks, because it suddenly refers to "both locks"without previously having mentioned more than one. Add a sentence to makethat read more sanely. Also, refer to the "pos of the slowest backend"not the "tail of the slowest backend", since we have no per-backend valuecalled "tail".
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‎src/backend/commands/async.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -224,6 +224,7 @@ typedef struct QueueBackendStatus
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* When holding the lock in EXCLUSIVE mode, backends can inspect the entries
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* of other backends and also change the head and tail pointers.
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*
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* AsyncCtlLock is used as the control lock for the pg_notify SLRU buffers.
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* In order to avoid deadlocks, whenever we need both locks, we always first
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* get AsyncQueueLock and then AsyncCtlLock.
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*
@@ -234,7 +235,7 @@ typedef struct QueueBackendStatus
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typedefstructAsyncQueueControl
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{
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QueuePositionhead;/* head points to the next free location */
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QueuePositiontail;/* the global tail is equivalent to thetail
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QueuePositiontail;/* the global tail is equivalent to thepos
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* of the "slowest" backend */
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TimestampTzlastQueueFillWarn;/* time of last queue-full msg */
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QueueBackendStatusbackend[FLEXIBLE_ARRAY_MEMBER];

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