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/*------------------------------------------------------------------------- * * async.h * Asynchronous notification: NOTIFY, LISTEN, UNLISTEN * * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/commands/async.h * *------------------------------------------------------------------------- */ #ifndef ASYNC_H #define ASYNC_H #include "fmgr.h" /* * The number of SLRU page buffers we use for the notification queue. */ #define NUM_ASYNC_BUFFERS 8 extern bool Trace_notify; extern Size AsyncShmemSize(void); extern void AsyncShmemInit(void); /* notify-related SQL statements */ extern void Async_Notify(const char *channel, const char *payload); extern void Async_Listen(const char *channel); extern void Async_Unlisten(const char *channel); extern void Async_UnlistenAll(void); /* notify-related SQL functions */ extern Datum pg_listening_channels(PG_FUNCTION_ARGS); extern Datum pg_notify(PG_FUNCTION_ARGS); /* perform (or cancel) outbound notify processing at transaction commit */ extern void PreCommit_Notify(void); extern void AtCommit_Notify(void); extern void AtAbort_Notify(void); extern void AtSubStart_Notify(void); extern void AtSubCommit_Notify(void); extern void AtSubAbort_Notify(void); extern void AtPrepare_Notify(void); extern void ProcessCompletedNotifies(void); /* signal handler for inbound notifies (PROCSIG_NOTIFY_INTERRUPT) */ extern void HandleNotifyInterrupt(void); /* * 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. */ extern void EnableNotifyInterrupt(void); extern bool DisableNotifyInterrupt(void); #endif /* ASYNC_H */