Movatterモバイル変換

[0]ホーム
URL:

Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

 Sign up
Appearance settings

Commitd3a4d63

Browse files
author
Neil Conway
committed
mbutils was previously doing some allocations, including invoking
fmgr_info(), in the TopMemoryContext. I couldn't see that the codeactually leaked, but in general I think it's fragile to assume thatpfree'ing an FmgrInfo along with its fn_extra field is enough toreclaim all the resources allocated by fmgr_info(). I changed thecode to do its allocations in a new child context ofTopMemoryContext, MbProcContext. When we want to release theallocations we can just reset the context, which is cleaner.
1 parent25b9b1b commitd3a4d63

File tree

1 file changed

+32
-38
lines changed

1 file changed

+32
-38
lines changed

‎src/backend/utils/mb/mbutils.c

Lines changed: 32 additions & 38 deletions
Original file line numberDiff line numberDiff line change
@@ -4,17 +4,17 @@
44
* (currently mule internal code (mic) is used)
55
* Tatsuo Ishii
66
*
7-
* $PostgreSQL: pgsql/src/backend/utils/mb/mbutils.c,v 1.54 2006/01/11 08:43:12 neilc Exp $
7+
* $PostgreSQL: pgsql/src/backend/utils/mb/mbutils.c,v 1.55 2006/01/12 22:04:02 neilc Exp $
88
*/
99
#include"postgres.h"
1010

1111
#include"access/xact.h"
12+
#include"catalog/namespace.h"
1213
#include"miscadmin.h"
1314
#include"mb/pg_wchar.h"
1415
#include"utils/builtins.h"
1516
#include"utils/memutils.h"
1617
#include"utils/syscache.h"
17-
#include"catalog/namespace.h"
1818

1919
/*
2020
* We handle for actual FE and BE encoding setting encoding-identificator
@@ -25,10 +25,12 @@ static pg_enc2name *ClientEncoding = &pg_enc2name_tbl[PG_SQL_ASCII];
2525
staticpg_enc2name*DatabaseEncoding=&pg_enc2name_tbl[PG_SQL_ASCII];
2626

2727
/*
28-
* Caches for conversion function info. Note that these values are
29-
* allocated in TopMemoryContext so that they survive across
30-
* transactions. See SetClientEncoding() for more details.
28+
* Caches for conversion function info. These values are allocated in
29+
* MbProcContext. That context is a child of TopMemoryContext,
30+
* which allows these values to survive across transactions. See
31+
* SetClientEncoding() for more details.
3132
*/
33+
staticMemoryContextMbProcContext=NULL;
3234
staticFmgrInfo*ToServerConvProc=NULL;
3335
staticFmgrInfo*ToClientConvProc=NULL;
3436

@@ -86,22 +88,10 @@ SetClientEncoding(int encoding, bool doit)
8688
if (doit)
8789
{
8890
ClientEncoding=&pg_enc2name_tbl[encoding];
89-
90-
if (ToServerConvProc!=NULL)
91-
{
92-
if (ToServerConvProc->fn_extra)
93-
pfree(ToServerConvProc->fn_extra);
94-
pfree(ToServerConvProc);
95-
}
9691
ToServerConvProc=NULL;
97-
98-
if (ToClientConvProc!=NULL)
99-
{
100-
if (ToClientConvProc->fn_extra)
101-
pfree(ToClientConvProc->fn_extra);
102-
pfree(ToClientConvProc);
103-
}
10492
ToClientConvProc=NULL;
93+
if (MbProcContext)
94+
MemoryContextReset(MbProcContext);
10595
}
10696
return0;
10797
}
@@ -134,33 +124,37 @@ SetClientEncoding(int encoding, bool doit)
134124
if (!doit)
135125
return0;
136126

137-
/*
138-
* load the fmgr info into TopMemoryContext so that it survives outside
139-
* transaction.
140-
*/
141-
oldcontext=MemoryContextSwitchTo(TopMemoryContext);
127+
/* Before loading the new fmgr info, remove the old info, if any */
128+
ToServerConvProc=NULL;
129+
ToClientConvProc=NULL;
130+
if (MbProcContext!=NULL)
131+
{
132+
MemoryContextReset(MbProcContext);
133+
}
134+
else
135+
{
136+
/*
137+
* This is the first time through, so create the context. Make
138+
* it a child of TopMemoryContext so that these values survive
139+
* across transactions.
140+
*/
141+
MbProcContext=AllocSetContextCreate(TopMemoryContext,
142+
"MbProcContext",
143+
ALLOCSET_SMALL_MINSIZE,
144+
ALLOCSET_SMALL_INITSIZE,
145+
ALLOCSET_SMALL_MAXSIZE);
146+
}
147+
148+
/* Load the fmgr info into MbProcContext */
149+
oldcontext=MemoryContextSwitchTo(MbProcContext);
142150
to_server=palloc(sizeof(FmgrInfo));
143151
to_client=palloc(sizeof(FmgrInfo));
144152
fmgr_info(to_server_proc,to_server);
145153
fmgr_info(to_client_proc,to_client);
146154
MemoryContextSwitchTo(oldcontext);
147155

148156
ClientEncoding=&pg_enc2name_tbl[encoding];
149-
150-
if (ToServerConvProc!=NULL)
151-
{
152-
if (ToServerConvProc->fn_extra)
153-
pfree(ToServerConvProc->fn_extra);
154-
pfree(ToServerConvProc);
155-
}
156157
ToServerConvProc=to_server;
157-
158-
if (ToClientConvProc!=NULL)
159-
{
160-
if (ToClientConvProc->fn_extra)
161-
pfree(ToClientConvProc->fn_extra);
162-
pfree(ToClientConvProc);
163-
}
164158
ToClientConvProc=to_client;
165159

166160
return0;

0 commit comments

Comments
 (0)
[8]ページ先頭
©2009-2025 Movatter.jp