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parallel.h
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1 /*-------------------------------------------------------------------------
2  *
3  * parallel.h
4  * Infrastructure for launching parallel workers
5  *
6  * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  * src/include/access/parallel.h
10  *
11  *-------------------------------------------------------------------------
12  */
13 
14 #ifndef PARALLEL_H
15 #define PARALLEL_H
16 
17 #include "access/xlogdefs.h"
18 #include "lib/ilist.h"
19 #include "postmaster/bgworker.h"
20 #include "storage/shm_mq.h"
21 #include "storage/shm_toc.h"
22 
23 typedef void (*parallel_worker_main_type) (dsm_segment *seg, shm_toc *toc);
24 
25 typedef struct ParallelWorkerInfo
26 {
30 
31 typedef struct ParallelContext
32 {
35  int nworkers; /* Maximum number of workers to launch */
36  int nworkers_to_launch; /* Actual number of workers to launch */
38  char *library_name;
49 
50 typedef struct ParallelWorkerContext
51 {
55 
56 extern PGDLLIMPORT volatile sig_atomic_t ParallelMessagePending;
59 
60 #define IsParallelWorker() (ParallelWorkerNumber >= 0)
61 
62 extern ParallelContext *CreateParallelContext(const char *library_name,
63  const char *function_name, int nworkers);
64 extern void InitializeParallelDSM(ParallelContext *pcxt);
65 extern void ReinitializeParallelDSM(ParallelContext *pcxt);
66 extern void ReinitializeParallelWorkers(ParallelContext *pcxt, int nworkers_to_launch);
67 extern void LaunchParallelWorkers(ParallelContext *pcxt);
70 extern void DestroyParallelContext(ParallelContext *pcxt);
71 extern bool ParallelContextActive(void);
72 
73 extern void HandleParallelMessageInterrupt(void);
74 extern void HandleParallelMessages(void);
75 extern void AtEOXact_Parallel(bool isCommit);
76 extern void AtEOSubXact_Parallel(bool isCommit, SubTransactionId mySubId);
77 extern void ParallelWorkerReportLastRecEnd(XLogRecPtr last_xlog_end);
78 
79 extern void ParallelWorkerMain(Datum main_arg);
80 
81 #endif /* PARALLEL_H */
#define PGDLLIMPORT
Definition: c.h:1303
uint32 SubTransactionId
Definition: c.h:643
PGDLLIMPORT volatile sig_atomic_t ParallelMessagePending
Definition: parallel.c:115
void HandleParallelMessageInterrupt(void)
Definition: parallel.c:1016
void InitializeParallelDSM(ParallelContext *pcxt)
Definition: parallel.c:205
PGDLLIMPORT int ParallelWorkerNumber
Definition: parallel.c:112
void WaitForParallelWorkersToFinish(ParallelContext *pcxt)
Definition: parallel.c:775
void LaunchParallelWorkers(ParallelContext *pcxt)
Definition: parallel.c:552
void ReinitializeParallelDSM(ParallelContext *pcxt)
Definition: parallel.c:488
void HandleParallelMessages(void)
Definition: parallel.c:1027
void DestroyParallelContext(ParallelContext *pcxt)
Definition: parallel.c:929
void ParallelWorkerReportLastRecEnd(XLogRecPtr last_xlog_end)
Definition: parallel.c:1539
PGDLLIMPORT bool InitializingParallelWorker
Definition: parallel.c:118
bool ParallelContextActive(void)
Definition: parallel.c:1003
void ParallelWorkerMain(Datum main_arg)
Definition: parallel.c:1271
ParallelContext * CreateParallelContext(const char *library_name, const char *function_name, int nworkers)
Definition: parallel.c:167
void(* parallel_worker_main_type)(dsm_segment *seg, shm_toc *toc)
Definition: parallel.h:23
struct ParallelWorkerContext ParallelWorkerContext
void ReinitializeParallelWorkers(ParallelContext *pcxt, int nworkers_to_launch)
Definition: parallel.c:538
struct ParallelContext ParallelContext
void WaitForParallelWorkersToAttach(ParallelContext *pcxt)
Definition: parallel.c:672
struct ParallelWorkerInfo ParallelWorkerInfo
void AtEOSubXact_Parallel(bool isCommit, SubTransactionId mySubId)
Definition: parallel.c:1235
void AtEOXact_Parallel(bool isCommit)
Definition: parallel.c:1254
uintptr_t Datum
Definition: postgres.h:64
char * library_name
Definition: parallel.h:38
dsm_segment * seg
Definition: parallel.h:42
bool * known_attached_workers
Definition: parallel.h:47
ErrorContextCallback * error_context_stack
Definition: parallel.h:40
SubTransactionId subid
Definition: parallel.h:34
shm_toc_estimator estimator
Definition: parallel.h:41
int nknown_attached_workers
Definition: parallel.h:46
ParallelWorkerInfo * worker
Definition: parallel.h:45
shm_toc * toc
Definition: parallel.h:44
dlist_node node
Definition: parallel.h:33
void * private_memory
Definition: parallel.h:43
int nworkers_launched
Definition: parallel.h:37
int nworkers_to_launch
Definition: parallel.h:36
char * function_name
Definition: parallel.h:39
dsm_segment * seg
Definition: parallel.h:52
BackgroundWorkerHandle * bgwhandle
Definition: parallel.h:27
shm_mq_handle * error_mqh
Definition: parallel.h:28
uint64 XLogRecPtr
Definition: xlogdefs.h:21