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Allow custom and foreign scans to have shutdown callbacks.

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This is expected to be useful mostly when performing such scans in
parallel, because in that case it allows (in combination with commit
acf555bc53) nodes below a Gather to get
control just before the DSM segment goes away.

KaiGai Kohei, except that I rewrote the documentation.  Reviewed by
Claudio Freire.

Discussion: http://postgr.es/m/CADyhKSXJK0jUJ8rWv4AmKDhsUh124_rEn39eqgfC5D8fu6xVuw@mail.gmail.com
This commit is contained in:
Robert Haas
2017-02-26 13:36:49 +05:30
parent 285ca26132
commit a315b967cc
9 changed files with 63 additions and 0 deletions
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16
src/backend/executor/nodeForeignscan.c
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@ -353,3 +353,19 @@ ExecForeignScanInitializeWorker(ForeignScanState *node, shm_toc *toc)
fdwroutine->InitializeWorkerForeignScan(node, toc, coordinate);
}
}
/* ----------------------------------------------------------------
* ExecShutdownForeignScan
*
* Gives FDW chance to stop asynchronous resource consumption
* and release any resources still held.
* ----------------------------------------------------------------
*/
void
ExecShutdownForeignScan(ForeignScanState *node)
{
FdwRoutine *fdwroutine = node->fdwroutine;
if (fdwroutine->ShutdownForeignScan)
fdwroutine->ShutdownForeignScan(node);
}