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Viewing changes to src/include/storage/procsignal.h

  • Committer: Bazaar Package Importer
  • Author(s): Martin Pitt
  • Date: 2011-05-11 10:41:53 UTC
  • Revision ID: james.westby@ubuntu.com-20110511104153-psbh2o58553fv1m0
Tags: upstream-9.1~beta1
Import upstream version 9.1~beta1

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src/include/storage/procsignal.h
 
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/*-------------------------------------------------------------------------
 
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 *
 
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 * procsignal.h
 
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 *        Routines for interprocess signalling
 
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 *
 
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 *
 
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 * Portions Copyright (c) 1996-2011, 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/storage/procsignal.h
 
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 *
 
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 *-------------------------------------------------------------------------
 
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 */
 
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#ifndef PROCSIGNAL_H
 
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#define PROCSIGNAL_H
 
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#include "storage/backendid.h"
 
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/*
 
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 * Reasons for signalling a Postgres child process (a backend or an auxiliary
 
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 * process, like bgwriter).  We can cope with concurrent signals for different
 
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 * reasons.  However, if the same reason is signaled multiple times in quick
 
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 * succession, the process is likely to observe only one notification of it.
 
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 * This is okay for the present uses.
 
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 *
 
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 * Also, because of race conditions, it's important that all the signals be
 
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 * defined so that no harm is done if a process mistakenly receives one.
 
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 */
 
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typedef enum
 
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{
 
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        PROCSIG_CATCHUP_INTERRUPT,      /* sinval catchup interrupt */
 
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        PROCSIG_NOTIFY_INTERRUPT,       /* listen/notify interrupt */
 
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        /* Recovery conflict reasons */
 
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        PROCSIG_RECOVERY_CONFLICT_DATABASE,
 
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        PROCSIG_RECOVERY_CONFLICT_TABLESPACE,
 
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        PROCSIG_RECOVERY_CONFLICT_LOCK,
 
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        PROCSIG_RECOVERY_CONFLICT_SNAPSHOT,
 
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        PROCSIG_RECOVERY_CONFLICT_BUFFERPIN,
 
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        PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK,
 
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        NUM_PROCSIGNALS                         /* Must be last! */
 
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} ProcSignalReason;
 
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/*
 
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 * prototypes for functions in procsignal.c
 
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 */
 
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extern Size ProcSignalShmemSize(void);
 
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extern void ProcSignalShmemInit(void);
 
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extern void ProcSignalInit(int pss_idx);
 
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extern int SendProcSignal(pid_t pid, ProcSignalReason reason,
 
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                           BackendId backendId);
 
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extern void procsignal_sigusr1_handler(SIGNAL_ARGS);
 
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#endif   /* PROCSIGNAL_H */