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Directory :  /usr/include/postgresql/9.6/server/postmaster/

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Current File : /usr/include/postgresql/9.6/server/postmaster/bgworker_internals.h
/*--------------------------------------------------------------------
 * bgworker_internals.h
 *		POSTGRES pluggable background workers internals
 *
 * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *		src/include/postmaster/bgworker_internals.h
 *--------------------------------------------------------------------
 */
#ifndef BGWORKER_INTERNALS_H
#define BGWORKER_INTERNALS_H

#include "datatype/timestamp.h"
#include "lib/ilist.h"
#include "postmaster/bgworker.h"

/*
 * List of background workers, private to postmaster.
 *
 * A worker that requests a database connection during registration will have
 * rw_backend set, and will be present in BackendList.  Note: do not rely on
 * rw_backend being non-NULL for shmem-connected workers!
 */
typedef struct RegisteredBgWorker
{
	BackgroundWorker rw_worker; /* its registry entry */
	struct bkend *rw_backend;	/* its BackendList entry, or NULL */
	pid_t		rw_pid;			/* 0 if not running */
	int			rw_child_slot;
	TimestampTz rw_crashed_at;	/* if not 0, time it last crashed */
	int			rw_shmem_slot;
	bool		rw_terminate;
	slist_node	rw_lnode;		/* list link */
} RegisteredBgWorker;

extern slist_head BackgroundWorkerList;

extern Size BackgroundWorkerShmemSize(void);
extern void BackgroundWorkerShmemInit(void);
extern void BackgroundWorkerStateChange(void);
extern void ForgetBackgroundWorker(slist_mutable_iter *cur);
extern void ReportBackgroundWorkerPID(RegisteredBgWorker *);
extern void BackgroundWorkerStopNotifications(pid_t pid);
extern void ResetBackgroundWorkerCrashTimes(void);

/* Function to start a background worker, called from postmaster.c */
extern void StartBackgroundWorker(void) pg_attribute_noreturn();

#ifdef EXEC_BACKEND
extern BackgroundWorker *BackgroundWorkerEntry(int slotno);
#endif

#endif   /* BGWORKER_INTERNALS_H */

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