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Add more critical-section calls: all code sections that hold spinlocks

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are now critical sections, so as to ensure die() won't interrupt us while
we are munging shared-memory data structures.  Avoid insecure intermediate
states in some code that proc_exit will call, like palloc/pfree.  Rename
START/END_CRIT_CODE to START/END_CRIT_SECTION, since that seems to be
what people tend to call them anyway, and make them be called with () like
a function call, in hopes of not confusing pg_indent.
I doubt that this is sufficient to make SIGTERM safe anywhere; there's
just too much code that could get invoked during proc_exit().
This commit is contained in:
Tom Lane
2001-01-12 21:54:01 +00:00
parent be8477bc37
commit 6162432de9
17 changed files with 163 additions and 129 deletions
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11
src/include/utils/elog.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: elog.h,v 1.22 2001/01/07 04:17:28 tgl Exp $
* $Id: elog.h,v 1.23 2001/01/12 21:54:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -34,16 +34,15 @@ extern int Use_syslog;
* ProcDiePending will be honored at critical section exit,
* but QueryCancel is only checked at specified points.
*/
extern uint32 CritSectionCount; /* duplicates access/xlog.h */
extern volatile uint32 CritSectionCount; /* duplicates access/xlog.h */
extern volatile bool ProcDiePending;
extern void ForceProcDie(void); /* in postgres.c */
#define START_CRIT_CODE (CritSectionCount++)
#define START_CRIT_SECTION() (CritSectionCount++)
#define END_CRIT_CODE \
#define END_CRIT_SECTION() \
do { \
if (CritSectionCount == 0) \
elog(STOP, "Not in critical section"); \
Assert(CritSectionCount > 0); \
CritSectionCount--; \
if (CritSectionCount == 0 && ProcDiePending) \
ForceProcDie(); \