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Change the autovacuum launcher to read pg_database directly, rather than

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via the "flat files" facility.  This requires making it enough like a backend
to be able to run transactions; it's no longer an "auxiliary process" but
more like the autovacuum worker processes.  Also, its signal handling has
to be brought into line with backends/workers.  In particular, since it
now has to handle procsignal.c processing, the special autovac-launcher-only
signal conditions are moved to SIGUSR2.

Alvaro, with some cleanup from Tom
This commit is contained in:
Tom Lane
2009-08-31 19:41:00 +00:00
parent 25ec228ef7
commit 00e6a16d01
8 changed files with 140 additions and 141 deletions
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12
src/backend/utils/misc/guc.c
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@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.513 2009/08/31 02:23:22 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.514 2009/08/31 19:41:00 tgl Exp $
*
*--------------------------------------------------------------------
*/
@ -1335,7 +1335,7 @@ static struct config_int ConfigureNamesInt[] =
* Note: MaxBackends is limited to INT_MAX/4 because some places compute
* 4*MaxBackends without any overflow check. This check is made in
* assign_maxconnections, since MaxBackends is computed as MaxConnections
* plus autovacuum_max_workers.
* plus autovacuum_max_workers plus one (for the autovacuum launcher).
*
* Likewise we have to limit NBuffers to INT_MAX/2.
*/
@ -7570,11 +7570,11 @@ show_tcp_keepalives_count(void)
static bool
assign_maxconnections(int newval, bool doit, GucSource source)
{
if (newval + autovacuum_max_workers > INT_MAX / 4)
if (newval + autovacuum_max_workers + 1 > INT_MAX / 4)
return false;
if (doit)
MaxBackends = newval + autovacuum_max_workers;
MaxBackends = newval + autovacuum_max_workers + 1;
return true;
}
@ -7582,11 +7582,11 @@ assign_maxconnections(int newval, bool doit, GucSource source)
static bool
assign_autovacuum_max_workers(int newval, bool doit, GucSource source)
{
if (newval + MaxConnections > INT_MAX / 4)
if (MaxConnections + newval + 1 > INT_MAX / 4)
return false;
if (doit)
MaxBackends = newval + MaxConnections;
MaxBackends = MaxConnections + newval + 1;
return true;
}