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Back-patch fix for correct TAS operation on multi-CPU PPC machines.

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This commit is contained in:
Tom Lane
2002-09-30 20:24:53 +00:00
parent c9e3806e57
commit c6ec2a8ba5
2 changed files with 22 additions and 2 deletions
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7
src/backend/storage/lmgr/s_lock.c
View File

@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/s_lock.c,v 1.5 2001/11/05 17:46:28 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/s_lock.c,v 1.5.2.1 2002/09/30 20:24:53 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -115,6 +115,9 @@ _success: \n\
/* used in darwin. */
/* We key off __APPLE__ here because this function differs from
* the LinuxPPC implementation only in compiler syntax.
*
* NOTE: per the Enhanced PowerPC Architecture manual, v1.0 dated 7-May-2002,
* an isync is a sufficient synchronization barrier after a lwarx/stwcx loop.
*/
static void
tas_dummy()
@@ -134,6 +137,7 @@ tas: \n\
fail: li r3,1 \n\
blr \n\
success: \n\
isync \n\
li r3,0 \n\
blr \n\
");
@@ -158,6 +162,7 @@ tas: \n\
fail: li 3,1 \n\
blr \n\
success: \n\
isync \n\
li 3,0 \n\
blr \n\
");

17
src/include/storage/s_lock.h
View File

@@ -63,7 +63,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: s_lock.h,v 1.97 2002/01/29 15:44:42 tgl Exp $
* $Id: s_lock.h,v 1.97.2.1 2002/09/30 20:24:53 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -217,6 +217,21 @@ tas(volatile slock_t *lock)
#endif /* defined(__mc68000__) && defined(__linux__) */
#if defined(__ppc__) || defined(__powerpc__)
/*
* We currently use out-of-line assembler for TAS on PowerPC; see s_lock.c.
* S_UNLOCK is almost standard but requires a "sync" instruction.
*/
#define S_UNLOCK(lock) \
do \
{\
__asm__ __volatile__ (" sync \n"); \
*((volatile slock_t *) (lock)) = 0; \
} while (0)
#endif /* defined(__ppc__) || defined(__powerpc__) */
#if defined(NEED_VAX_TAS_ASM)
/*
* VAXen -- even multiprocessor ones