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Substantial rewrite of async.c to avoid problems with non-reentrant stdio

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and possibly other problems.  Minor changes in xact.c and postgres.c's
main loop to support new handling of async NOTIFY.
This commit is contained in:
Tom Lane
1998-10-06 02:40:09 +00:00
parent e7e027a6c9
commit c77a29a14e
7 changed files with 651 additions and 517 deletions
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27
src/include/commands/async.h
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@@ -1,27 +1,38 @@
/*-------------------------------------------------------------------------
*
* async.h--
*
*
* Asynchronous notification: NOTIFY, LISTEN, UNLISTEN
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: async.h,v 1.9 1998/09/01 04:35:22 momjian Exp $
* $Id: async.h,v 1.10 1998/10/06 02:40:08 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef ASYNC_H
#define ASYNC_H
#include <nodes/memnodes.h>
#include <postgres.h>
extern void Async_NotifyHandler(SIGNAL_ARGS);
/* notify-related SQL statements */
extern void Async_Notify(char *relname);
extern void Async_NotifyAtCommit(void);
extern void Async_NotifyAtAbort(void);
extern void Async_Listen(char *relname, int pid);
extern void Async_Unlisten(char *relname, int pid);
extern GlobalMemory notifyContext;
/* 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 */