greenplumn bgworker_internals 源码
greenplumn bgworker_internals 代码
文件路径：/src/include/postmaster/bgworker_internals.h
/*--------------------------------------------------------------------
* bgworker_internals.h
* POSTGRES pluggable background workers internals
*
* Portions Copyright (c) 1996-2019, 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.
*
* 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 ReportBackgroundWorkerExit(slist_mutable_iter *cur);
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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