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/*--------------------------------------------------------------------
* bgworker_internals.h
* POSTGRES pluggable background workers internals
*
* Portions Copyright (c) 1996-2024, 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"
/* GUC options */
/*
* Maximum possible value of parallel workers.
*/
#define MAX_PARALLEL_WORKER_LIMIT 1024
/*
* List of background workers, private to postmaster.
*
* All workers that are currently running will also have an entry in
* BackendList.
*/
typedef struct RegisteredBgWorker
{
BackgroundWorker rw_worker; /* its registry entry */
pid_t rw_pid; /* 0 if not running */
TimestampTz rw_crashed_at; /* if not 0, time it last crashed */
int rw_shmem_slot;
bool rw_terminate;
dlist_node rw_lnode; /* list link */
} RegisteredBgWorker;
extern PGDLLIMPORT dlist_head BackgroundWorkerList;
extern Size BackgroundWorkerShmemSize(void);
extern void BackgroundWorkerShmemInit(void);
extern void BackgroundWorkerStateChange(bool allow_new_workers);
extern void ForgetBackgroundWorker(RegisteredBgWorker *rw);
extern void ReportBackgroundWorkerPID(RegisteredBgWorker *rw);
extern void ReportBackgroundWorkerExit(RegisteredBgWorker *rw);
extern void BackgroundWorkerStopNotifications(pid_t pid);
extern void ForgetUnstartedBackgroundWorkers(void);
extern void ResetBackgroundWorkerCrashTimes(void);
/* Entry point for background worker processes */
extern void BackgroundWorkerMain(char *startup_data, size_t startup_data_len) pg_attribute_noreturn();
#endif /* BGWORKER_INTERNALS_H */
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