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/*-------------------------------------------------------------------------
*
* procsignal.h
* Routines for interprocess signalling
*
*
* Portions Copyright (c) 2012-2014, TransLattice, Inc.
* Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/storage/procsignal.h
*
*-------------------------------------------------------------------------
*/
#ifndef PROCSIGNAL_H
#define PROCSIGNAL_H
#include "storage/backendid.h"
/*
* Reasons for signalling a Postgres child process (a backend or an auxiliary
* process, like checkpointer). We can cope with concurrent signals for different
* reasons. However, if the same reason is signaled multiple times in quick
* succession, the process is likely to observe only one notification of it.
* This is okay for the present uses.
*
* Also, because of race conditions, it's important that all the signals be
* defined so that no harm is done if a process mistakenly receives one.
*/
#ifdef PGXC
/*
* In the case of Postgres-XC, it may be possible that this backend is
* signaled during a pool manager reload process. In this case it means that
* remote node connection has been changed inside pooler, so backend has to
* abort its current transaction, reconnect to pooler and update its session
* information regarding remote node handles.
*/
#endif
typedef enum
{
PROCSIG_CATCHUP_INTERRUPT, /* sinval catchup interrupt */
PROCSIG_NOTIFY_INTERRUPT, /* listen/notify interrupt */
#ifdef PGXC
PROCSIG_PGXCPOOL_RELOAD, /* abort current transaction and reconnect to pooler */
PROCSIG_PGXCPOOL_REFRESH, /* refresh local view of connection handles */
#endif
PROCSIG_PARALLEL_MESSAGE, /* message from cooperating parallel backend */
PROCSIG_WALSND_INIT_STOPPING, /* ask walsenders to prepare for shutdown */
/* Recovery conflict reasons */
PROCSIG_RECOVERY_CONFLICT_DATABASE,
PROCSIG_RECOVERY_CONFLICT_TABLESPACE,
PROCSIG_RECOVERY_CONFLICT_LOCK,
PROCSIG_RECOVERY_CONFLICT_SNAPSHOT,
PROCSIG_RECOVERY_CONFLICT_BUFFERPIN,
PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK,
NUM_PROCSIGNALS /* Must be last! */
} ProcSignalReason;
/*
* prototypes for functions in procsignal.c
*/
extern Size ProcSignalShmemSize(void);
extern void ProcSignalShmemInit(void);
extern void ProcSignalInit(int pss_idx);
extern int SendProcSignal(pid_t pid, ProcSignalReason reason,
BackendId backendId);
extern void procsignal_sigusr1_handler(SIGNAL_ARGS);
#endif /* PROCSIGNAL_H */
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