src/include/commands/async.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * async.h
   4  *        Asynchronous notification: NOTIFY, LISTEN, UNLISTEN
   5  *
   6  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
   7  * Portions Copyright (c) 1994, Regents of the University of California
   8  *
   9  * $PostgreSQL$
  10  *
  11  *-------------------------------------------------------------------------
  12  */
  13 #ifndef ASYNC_H
  14 #define ASYNC_H
  15
  16 extern bool Trace_notify;
  17
  18 /* notify-related SQL statements */
  19 extern void Async_Notify(const char *relname);
  20 extern void Async_Listen(const char *relname);
  21 extern void Async_Unlisten(const char *relname);
  22 extern void Async_UnlistenAll(void);
  23
  24 /* perform (or cancel) outbound notify processing at transaction commit */
  25 extern void AtCommit_Notify(void);
  26 extern void AtAbort_Notify(void);
  27 extern void AtSubStart_Notify(void);
  28 extern void AtSubCommit_Notify(void);
  29 extern void AtSubAbort_Notify(void);
  30 extern void AtPrepare_Notify(void);
  31
  32 /* signal handler for inbound notifies (SIGUSR2) */
  33 extern void NotifyInterruptHandler(SIGNAL_ARGS);
  34
  35 /*
  36  * enable/disable processing of inbound notifies directly from signal handler.
  37  * The enable routine first performs processing of any inbound notifies that
  38  * have occurred since the last disable.
  39  */
  40 extern void EnableNotifyInterrupt(void);
  41 extern bool DisableNotifyInterrupt(void);
  42
  43 extern void notify_twophase_postcommit(TransactionId xid, uint16 info,
  44                                                    void *recdata, uint32 len);
  45
  46 #endif   /* ASYNC_H */