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Revise the API for GUC variable assign hooks.

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The previous functions of assign hooks are now split between check hooks
and assign hooks, where the former can fail but the latter shouldn't.
Aside from being conceptually clearer, this approach exposes the
"canonicalized" form of the variable value to guc.c without having to do
an actual assignment.  And that lets us fix the problem recently noted by
Bernd Helmle that the auto-tune patch for wal_buffers resulted in bogus
log messages about "parameter "wal_buffers" cannot be changed without
restarting the server".  There may be some speed advantage too, because
this design lets hook functions avoid re-parsing variable values when
restoring a previous state after a rollback (they can store a pre-parsed
representation of the value instead).  This patch also resolves a
longstanding annoyance about custom error messages from variable assign
hooks: they should modify, not appear separately from, guc.c's own message
about "invalid parameter value".
This commit is contained in:
Tom Lane
2011-04-07 00:11:01 -04:00
parent 5d0e462366
commit 2594cf0e8c
35 changed files with 2645 additions and 1888 deletions
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33
src/backend/utils/adt/datetime.c
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@ -4140,20 +4140,17 @@ CheckDateTokenTables(void)
/*
* This function gets called during timezone config file load or reload
* to create the final array of timezone tokens. The argument array
* is already sorted in name order. This data is in a temporary memory
* context and must be copied to somewhere permanent.
* is already sorted in name order. The data is converted to datetkn
* format and installed in *tbl, which must be allocated by the caller.
*/
void
InstallTimeZoneAbbrevs(tzEntry *abbrevs, int n)
ConvertTimeZoneAbbrevs(TimeZoneAbbrevTable *tbl,
struct tzEntry *abbrevs, int n)
{
datetkn *newtbl;
datetkn *newtbl = tbl->abbrevs;
int i;
/*
* Copy the data into TopMemoryContext and convert to datetkn format.
*/
newtbl = (datetkn *) MemoryContextAlloc(TopMemoryContext,
n * sizeof(datetkn));
tbl->numabbrevs = n;
for (i = 0; i < n; i++)
{
strncpy(newtbl[i].token, abbrevs[i].abbrev, TOKMAXLEN);
@ -4163,12 +4160,20 @@ InstallTimeZoneAbbrevs(tzEntry *abbrevs, int n)
/* Check the ordering, if testing */
Assert(CheckDateTokenTable("timezone offset", newtbl, n));
}
/* Now safe to replace existing table (if any) */
if (timezonetktbl)
pfree(timezonetktbl);
timezonetktbl = newtbl;
sztimezonetktbl = n;
/*
* Install a TimeZoneAbbrevTable as the active table.
*
* Caller is responsible that the passed table doesn't go away while in use.
*/
void
InstallTimeZoneAbbrevs(TimeZoneAbbrevTable *tbl)
{
int i;
timezonetktbl = tbl->abbrevs;
sztimezonetktbl = tbl->numabbrevs;
/* clear date cache in case it contains any stale timezone names */
for (i = 0; i < MAXDATEFIELDS; i++)