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8ec569479f
Up until now, we've had a policy of only marking certain variables in the PostgreSQL header files with PGDLLIMPORT, but now we've decided to mark them all. This means that extensions running on Windows should no longer operate at a disadvantage as compared to extensions running on Linux: if the variable is present in a header file, it should be accessible. Discussion: http://postgr.es/m/CA+TgmoYanc1_FSfimhgiWSqVyP5KKmh5NP2BWNwDhO8Pg2vGYQ@mail.gmail.com
83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* parallel.h
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* Infrastructure for launching parallel workers
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*
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* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/access/parallel.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PARALLEL_H
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#define PARALLEL_H
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#include "access/xlogdefs.h"
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#include "lib/ilist.h"
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#include "postmaster/bgworker.h"
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#include "storage/shm_mq.h"
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#include "storage/shm_toc.h"
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typedef void (*parallel_worker_main_type) (dsm_segment *seg, shm_toc *toc);
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typedef struct ParallelWorkerInfo
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{
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BackgroundWorkerHandle *bgwhandle;
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shm_mq_handle *error_mqh;
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int32 pid;
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} ParallelWorkerInfo;
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typedef struct ParallelContext
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{
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dlist_node node;
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SubTransactionId subid;
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int nworkers; /* Maximum number of workers to launch */
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int nworkers_to_launch; /* Actual number of workers to launch */
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int nworkers_launched;
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char *library_name;
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char *function_name;
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ErrorContextCallback *error_context_stack;
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shm_toc_estimator estimator;
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dsm_segment *seg;
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void *private_memory;
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shm_toc *toc;
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ParallelWorkerInfo *worker;
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int nknown_attached_workers;
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bool *known_attached_workers;
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} ParallelContext;
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typedef struct ParallelWorkerContext
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{
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dsm_segment *seg;
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shm_toc *toc;
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} ParallelWorkerContext;
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extern PGDLLIMPORT volatile bool ParallelMessagePending;
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extern PGDLLIMPORT int ParallelWorkerNumber;
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extern PGDLLIMPORT bool InitializingParallelWorker;
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#define IsParallelWorker() (ParallelWorkerNumber >= 0)
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extern ParallelContext *CreateParallelContext(const char *library_name,
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const char *function_name, int nworkers);
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extern void InitializeParallelDSM(ParallelContext *pcxt);
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extern void ReinitializeParallelDSM(ParallelContext *pcxt);
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extern void ReinitializeParallelWorkers(ParallelContext *pcxt, int nworkers_to_launch);
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extern void LaunchParallelWorkers(ParallelContext *pcxt);
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extern void WaitForParallelWorkersToAttach(ParallelContext *pcxt);
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extern void WaitForParallelWorkersToFinish(ParallelContext *pcxt);
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extern void DestroyParallelContext(ParallelContext *pcxt);
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extern bool ParallelContextActive(void);
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extern void HandleParallelMessageInterrupt(void);
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extern void HandleParallelMessages(void);
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extern void AtEOXact_Parallel(bool isCommit);
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extern void AtEOSubXact_Parallel(bool isCommit, SubTransactionId mySubId);
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extern void ParallelWorkerReportLastRecEnd(XLogRecPtr last_xlog_end);
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extern void ParallelWorkerMain(Datum main_arg);
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#endif /* PARALLEL_H */
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