index 3b71174b82640a9118ced2d771a083e59f9603f6..91baede4e363f148e00bae53f9d6bdd4a1d5f4a3 100644 (file)
* When holding the lock in EXCLUSIVE mode, backends can inspect the entries
* of other backends and also change the head and tail pointers.
*
+ * AsyncCtlLock is used as the control lock for the pg_notify SLRU buffers.
* In order to avoid deadlocks, whenever we need both locks, we always first
* get AsyncQueueLock and then AsyncCtlLock.
*
typedef struct AsyncQueueControl
{
QueuePosition head; /* head points to the next free location */
- QueuePosition tail; /* the global tail is equivalent to the tail
+ QueuePosition tail; /* the global tail is equivalent to the pos
* of the "slowest" backend */
TimestampTz lastQueueFillWarn; /* time of last queue-full msg */
QueueBackendStatus backend[FLEXIBLE_ARRAY_MEMBER];