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Fix PPC s_lock operations to work correctly on multi-CPU machines.

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Need 'isync' during TAS and 'sync' during S_UNLOCK.
This commit is contained in:
Tom Lane
2002-09-21 00:14:05 +00:00
parent b2735fcd52
commit 7233aae50b
2 changed files with 22 additions and 2 deletions
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7
src/backend/storage/lmgr/s_lock.c
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@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/s_lock.c,v 1.8 2002/06/20 20:29:35 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/s_lock.c,v 1.9 2002/09/21 00:14:05 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\
");