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/*-------------------------------------------------------------------------
*
* async.h
* Asynchronous notification: NOTIFY, LISTEN, UNLISTEN
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: async.h,v 1.18 2001/10/25 05:49:58 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef ASYNC_H
#define ASYNC_H
extern bool Trace_notify;
/* notify-related SQL statements */
extern void Async_Notify(char *relname);
extern void Async_Listen(char *relname, int pid);
extern void Async_Unlisten(char *relname, int pid);
/* perform (or cancel) outbound notify processing at transaction commit */
extern void AtCommit_Notify(void);
extern void AtAbort_Notify(void);
/* signal handler for inbound notifies (SIGUSR2) */
extern void Async_NotifyHandler(SIGNAL_ARGS);
/*
* enable/disable processing of inbound notifies directly from signal handler.
* The enable routine first performs processing of any inbound notifies that
* have occurred since the last disable. These are meant to be called ONLY
* from the appropriate places in PostgresMain().
*/
extern void EnableNotifyInterrupt(void);
extern void DisableNotifyInterrupt(void);
#endif /* ASYNC_H */
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