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967e276e9f
Allocate notify-related state lazily instead. This makes trivial subtransactions noticeably faster. Patch by me, reviewed and tested by Dilip Kumar, Kyotaro Horiguchi, and Jeevan Ladhe. Discussion: https://postgr.es/m/CA+TgmobE1J22S1eC-6N-je9LgrcwZypkwp+zH6JXo9mc=4Nk3A@mail.gmail.com
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* async.h
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* Asynchronous notification: NOTIFY, LISTEN, UNLISTEN
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*
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* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/commands/async.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef ASYNC_H
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#define ASYNC_H
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#include <signal.h>
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/*
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* The number of SLRU page buffers we use for the notification queue.
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*/
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#define NUM_ASYNC_BUFFERS 8
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extern bool Trace_notify;
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extern volatile sig_atomic_t notifyInterruptPending;
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extern Size AsyncShmemSize(void);
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extern void AsyncShmemInit(void);
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extern void NotifyMyFrontEnd(const char *channel,
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const char *payload,
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int32 srcPid);
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/* notify-related SQL statements */
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extern void Async_Notify(const char *channel, const char *payload);
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extern void Async_Listen(const char *channel);
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extern void Async_Unlisten(const char *channel);
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extern void Async_UnlistenAll(void);
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/* perform (or cancel) outbound notify processing at transaction commit */
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extern void PreCommit_Notify(void);
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extern void AtCommit_Notify(void);
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extern void AtAbort_Notify(void);
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extern void AtSubCommit_Notify(void);
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extern void AtSubAbort_Notify(void);
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extern void AtPrepare_Notify(void);
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extern void ProcessCompletedNotifies(void);
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/* signal handler for inbound notifies (PROCSIG_NOTIFY_INTERRUPT) */
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extern void HandleNotifyInterrupt(void);
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/* process interrupts */
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extern void ProcessNotifyInterrupt(void);
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#endif /* ASYNC_H */
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