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3a1f8611f2
Commit b0b0d84b3d purported to make it
possible to relaunch workers using the same parallel context, but it had
an unpleasant race condition: we might reinitialize after the workers
have sent their last control message but before they have dettached the
DSM, leaving to crashes. Repair by introducing a new ParallelContext
operation, ReinitializeParallelDSM.
Adjust execParallel.c to use this new support, so that we can rescan a
Gather node by relaunching workers but without needing to recreate the
DSM.
Amit Kapila, with some adjustments by me. Extracted from latest parallel
sequential scan patch.
38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
/*--------------------------------------------------------------------
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* execParallel.h
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* POSTGRES parallel execution interface
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*
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* Portions Copyright (c) 1996-2015, 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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* IDENTIFICATION
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* src/include/executor/execParallel.h
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*--------------------------------------------------------------------
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*/
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#ifndef EXECPARALLEL_H
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#define EXECPARALLEL_H
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#include "access/parallel.h"
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#include "nodes/execnodes.h"
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#include "nodes/parsenodes.h"
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#include "nodes/plannodes.h"
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typedef struct SharedExecutorInstrumentation SharedExecutorInstrumentation;
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typedef struct ParallelExecutorInfo
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{
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PlanState *planstate;
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ParallelContext *pcxt;
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BufferUsage *buffer_usage;
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SharedExecutorInstrumentation *instrumentation;
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shm_mq_handle **tqueue;
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} ParallelExecutorInfo;
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extern ParallelExecutorInfo *ExecInitParallelPlan(PlanState *planstate,
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EState *estate, int nworkers);
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extern void ExecParallelFinish(ParallelExecutorInfo *pei);
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extern void ExecParallelCleanup(ParallelExecutorInfo *pei);
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extern shm_mq_handle **ExecParallelReinitializeTupleQueues(ParallelContext *pcxt);
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#endif /* EXECPARALLEL_H */
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