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Add an Assert() to max_parallel_workers enforcement.

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To prevent future bugs along the lines of the one corrected by commit
8ff518699f, or find any that remain
in the current code, add an Assert() that the difference between
parallel_register_count and parallel_terminate_count is in a sane
range.

Kuntal Ghosh, with considerable tidying-up by me, per a suggestion
from Neha Khatri.  Reviewed by Tomas Vondra.

Discussion: http://postgr.es/m/CAFO0U+-E8yzchwVnvn5BeRDPgX2z9vZUxQ8dxx9c0XFGBC7N1Q@mail.gmail.com
This commit is contained in:
Robert Haas
2017-04-11 13:03:44 -04:00
parent 8ff518699f
commit 6599c9ac33
3 changed files with 13 additions and 3 deletions
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6
src/backend/utils/misc/guc.c
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@ -57,7 +57,7 @@
#include "parser/scansup.h"
#include "pgstat.h"
#include "postmaster/autovacuum.h"
#include "postmaster/bgworker.h"
#include "postmaster/bgworker_internals.h"
#include "postmaster/bgwriter.h"
#include "postmaster/postmaster.h"
#include "postmaster/syslogger.h"
@ -2713,7 +2713,7 @@ static struct config_int ConfigureNamesInt[] =
NULL
},
&max_parallel_workers_per_gather,
2, 0, 1024,
2, 0, MAX_PARALLEL_WORKER_LIMIT,
NULL, NULL, NULL
},
@ -2723,7 +2723,7 @@ static struct config_int ConfigureNamesInt[] =
NULL
},
&max_parallel_workers,
8, 0, 1024,
8, 0, MAX_PARALLEL_WORKER_LIMIT,
NULL, NULL, NULL
},