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/*-------------------------------------------------------------------------
*
* parallel.h
* Infrastructure for launching parallel workers
*
* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/access/parallel.h
*
*-------------------------------------------------------------------------
*/
#ifndef PARALLEL_H
#define PARALLEL_H
#include "access/xlogdefs.h"
#include "lib/ilist.h"
#include "postmaster/bgworker.h"
#include "storage/shm_mq.h"
#include "storage/shm_toc.h"
typedef void (*parallel_worker_main_type) (dsm_segment *seg, shm_toc *toc);
typedef struct ParallelWorkerInfo
{
BackgroundWorkerHandle *bgwhandle;
shm_mq_handle *error_mqh;
int32 pid;
} ParallelWorkerInfo;
typedef struct ParallelContext
{
dlist_node node;
SubTransactionId subid;
int nworkers; /* Maximum number of workers to launch */
int nworkers_to_launch; /* Actual number of workers to launch */
int nworkers_launched;
char *library_name;
char *function_name;
ErrorContextCallback *error_context_stack;
shm_toc_estimator estimator;
dsm_segment *seg;
void *private_memory;
shm_toc *toc;
ParallelWorkerInfo *worker;
int nknown_attached_workers;
bool *known_attached_workers;
} ParallelContext;
typedef struct ParallelWorkerContext
{
dsm_segment *seg;
shm_toc *toc;
} ParallelWorkerContext;
extern volatile bool ParallelMessagePending;
extern PGDLLIMPORT int ParallelWorkerNumber;
extern PGDLLIMPORT bool InitializingParallelWorker;
#define IsParallelWorker() (ParallelWorkerNumber >= 0)
extern ParallelContext *CreateParallelContext(const char *library_name,
const char *function_name, int nworkers);
extern void InitializeParallelDSM(ParallelContext *pcxt);
extern void ReinitializeParallelDSM(ParallelContext *pcxt);
extern void ReinitializeParallelWorkers(ParallelContext *pcxt, int nworkers_to_launch);
extern void LaunchParallelWorkers(ParallelContext *pcxt);
extern void WaitForParallelWorkersToAttach(ParallelContext *pcxt);
extern void WaitForParallelWorkersToFinish(ParallelContext *pcxt);
extern void DestroyParallelContext(ParallelContext *pcxt);
extern bool ParallelContextActive(void);
extern void HandleParallelMessageInterrupt(void);
extern void HandleParallelMessages(void);
extern void AtEOXact_Parallel(bool isCommit);
extern void AtEOSubXact_Parallel(bool isCommit, SubTransactionId mySubId);
extern void ParallelWorkerReportLastRecEnd(XLogRecPtr last_xlog_end);
extern void ParallelWorkerMain(Datum main_arg);
#endif /* PARALLEL_H */
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