60 lines
1.8 KiB
C
60 lines
1.8 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) 1996-2012, 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 "fmgr.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 Size AsyncShmemSize(void);
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extern void AsyncShmemInit(void);
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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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/* notify-related SQL functions */
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extern Datum pg_listening_channels(PG_FUNCTION_ARGS);
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extern Datum pg_notify(PG_FUNCTION_ARGS);
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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 AtSubStart_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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/*
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* enable/disable processing of inbound notifies directly from signal handler.
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* The enable routine first performs processing of any inbound notifies that
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* have occurred since the last disable.
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*/
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extern void EnableNotifyInterrupt(void);
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extern bool DisableNotifyInterrupt(void);
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#endif /* ASYNC_H */
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