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Commit206378e

Browse files
committed
Use CRITICAL_SECTION instead of Mutexes for thread-locking in libpq on
Windows, for better performance.Per suggestion from Andrew Chernow, but not his patch since the underlyingcode was changed to deal with return values.
1 parent763c486 commit206378e

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2 files changed

+10
-7
lines changed

2 files changed

+10
-7
lines changed

‎src/interfaces/libpq/pthread-win32.c

Lines changed: 8 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -5,7 +5,7 @@
55
*
66
* Copyright (c) 2004-2008, PostgreSQL Global Development Group
77
* IDENTIFICATION
8-
*$PostgreSQL: pgsql/src/interfaces/libpq/pthread-win32.c,v 1.16 2008/05/16 18:30:53 mha Exp $
8+
*$PostgreSQL: pgsql/src/interfaces/libpq/pthread-win32.c,v 1.17 2008/05/21 14:20:48 mha Exp $
99
*
1010
*-------------------------------------------------------------------------
1111
*/
@@ -35,24 +35,27 @@ pthread_getspecific(pthread_key_t key)
3535
int
3636
pthread_mutex_init(pthread_mutex_t*mp,void*attr)
3737
{
38-
*mp=CreateMutex(0,0,0);
39-
if (*mp==NULL)
38+
*mp=(CRITICAL_SECTION*)malloc(sizeof(CRITICAL_SECTION));
39+
if (!*mp)
4040
return1;
41+
InitializeCriticalSection(*mp);
4142
return0;
4243
}
4344

4445
int
4546
pthread_mutex_lock(pthread_mutex_t*mp)
4647
{
47-
if (WaitForSingleObject(*mp,INFINITE)!=WAIT_OBJECT_0)
48+
if (!*mp)
4849
return1;
50+
EnterCriticalSection(*mp);
4951
return0;
5052
}
5153

5254
int
5355
pthread_mutex_unlock(pthread_mutex_t*mp)
5456
{
55-
if (!ReleaseMutex(*mp))
57+
if (!*mp)
5658
return1;
59+
LeaveCriticalSection(*mp);
5760
return0;
5861
}

‎src/port/pthread-win32.h

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,11 +1,11 @@
11
/*
2-
* $PostgreSQL: pgsql/src/port/pthread-win32.h,v 1.4 2008/05/17 01:28:25 adunstan Exp $
2+
* $PostgreSQL: pgsql/src/port/pthread-win32.h,v 1.5 2008/05/21 14:20:48 mha Exp $
33
*/
44
#ifndef__PTHREAD_H
55
#define__PTHREAD_H
66

77
typedefULONGpthread_key_t;
8-
typedefHANDLEpthread_mutex_t;
8+
typedefCRITICAL_SECTION*pthread_mutex_t;
99
typedefintpthread_once_t;
1010

1111
DWORDpthread_self(void);

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