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Provide DSM segment to ExecXXXInitializeWorker functions.

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Previously, executor nodes running in parallel worker processes didn't
have access to the dsm_segment object used for parallel execution.  In
order to support resource management based on DSM segment lifetime,
they need that.  So create a ParallelWorkerContext object to hold it
and pass it to all InitializeWorker functions.

Author: Thomas Munro
Reviewed-By: Andres Freund
Discussion: https://postgr.es/m/CAEepm=2W=cOkiZxcg6qiFQP-dHUe09aqTrEMM7yJDrHMhDv_RA@mail.gmail.com
This commit is contained in:
Andres Freund
2017-11-16 17:28:11 -08:00
parent 09a777447a
commit 7082e614c0
17 changed files with 55 additions and 33 deletions
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5
src/backend/executor/nodeSeqscan.c
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@ -348,11 +348,12 @@ ExecSeqScanReInitializeDSM(SeqScanState *node,
* ----------------------------------------------------------------
*/
void
ExecSeqScanInitializeWorker(SeqScanState *node, shm_toc *toc)
ExecSeqScanInitializeWorker(SeqScanState *node,
ParallelWorkerContext *pwcxt)
{
ParallelHeapScanDesc pscan;
pscan = shm_toc_lookup(toc, node->ss.ps.plan->plan_node_id, false);
pscan = shm_toc_lookup(pwcxt->toc, node->ss.ps.plan->plan_node_id, false);
node->ss.ss_currentScanDesc =
heap_beginscan_parallel(node->ss.ss_currentRelation, pscan);
}