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/*--------------------------------------------------------------------
* execParallel.h
* POSTGRES parallel execution interface
*
* Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/include/executor/execParallel.h
*--------------------------------------------------------------------
*/
#ifndef EXECPARALLEL_H
#define EXECPARALLEL_H
#include "access/parallel.h"
#include "nodes/execnodes.h"
#include "nodes/parsenodes.h"
#include "nodes/plannodes.h"
#include "utils/dsa.h"
typedef struct SharedExecutorInstrumentation SharedExecutorInstrumentation;
typedef struct ParallelExecutorInfo
{
PlanState *planstate; /* plan subtree we're running in parallel */
ParallelContext *pcxt; /* parallel context we're using */
BufferUsage *buffer_usage; /* points to bufusage area in DSM */
SharedExecutorInstrumentation *instrumentation; /* optional */
struct SharedJitInstrumentation *jit_instrumentation; /* optional */
dsa_area *area; /* points to DSA area in DSM */
dsa_pointer param_exec; /* serialized PARAM_EXEC parameters */
bool finished; /* set true by ExecParallelFinish */
/* These two arrays have pcxt->nworkers_launched entries: */
shm_mq_handle **tqueue; /* tuple queues for worker output */
struct TupleQueueReader **reader; /* tuple reader/writer support */
} ParallelExecutorInfo;
extern ParallelExecutorInfo *ExecInitParallelPlan(PlanState *planstate,
EState *estate, Bitmapset *sendParam, int nworkers,
int64 tuples_needed);
extern void ExecParallelCreateReaders(ParallelExecutorInfo *pei);
extern void ExecParallelFinish(ParallelExecutorInfo *pei);
extern void ExecParallelCleanup(ParallelExecutorInfo *pei);
extern void ExecParallelReinitialize(PlanState *planstate,
ParallelExecutorInfo *pei, Bitmapset *sendParam);
extern void ParallelQueryMain(dsm_segment *seg, shm_toc *toc);
#endif /* EXECPARALLEL_H */
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