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Restructure backend SIGINT/SIGTERM handling so that 'die' interrupts

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are treated more like 'cancel' interrupts: the signal handler sets a
flag that is examined at well-defined spots, rather than trying to cope
with an interrupt that might happen anywhere.  See pghackers discussion
of 1/12/01.
This commit is contained in:
Tom Lane
2001-01-14 05:08:17 +00:00
parent 027f144e39
commit 36839c1927
24 changed files with 614 additions and 479 deletions
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35
src/include/utils/elog.h
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@@ -7,13 +7,14 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: elog.h,v 1.23 2001/01/12 21:54:01 tgl Exp $
* $Id: elog.h,v 1.24 2001/01/14 05:08:16 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef ELOG_H
#define ELOG_H
/* Error level codes */
#define NOTICE 0 /* random info - no special action */
#define ERROR (-1) /* user error - return to known state */
#define FATAL 1 /* fatal error - abort process */
@@ -23,47 +24,25 @@
#define LOG DEBUG
#define NOIND (-3) /* debug message, don't indent as far */
/* Configurable parameters */
#ifdef ENABLE_SYSLOG
extern int Use_syslog;
#endif
/*
* If CritSectionCount > 0, signal handlers mustn't do
* elog(ERROR|FATAL), instead remember what action is
* required with QueryCancel or ProcDiePending.
* ProcDiePending will be honored at critical section exit,
* but QueryCancel is only checked at specified points.
*/
extern volatile uint32 CritSectionCount; /* duplicates access/xlog.h */
extern volatile bool ProcDiePending;
extern void ForceProcDie(void); /* in postgres.c */
#define START_CRIT_SECTION() (CritSectionCount++)
#define END_CRIT_SECTION() \
do { \
Assert(CritSectionCount > 0); \
CritSectionCount--; \
if (CritSectionCount == 0 && ProcDiePending) \
ForceProcDie(); \
} while(0)
extern bool Log_timestamp;
extern bool Log_pid;
#ifndef __GNUC__
extern void elog(int lev, const char *fmt,...);
extern void elog(int lev, const char *fmt, ...);
#else
/* This extension allows gcc to check the format string for consistency with
the supplied arguments. */
extern void elog(int lev, const char *fmt,...) __attribute__((format(printf, 2, 3)));
extern void elog(int lev, const char *fmt, ...)
__attribute__((format(printf, 2, 3)));
#endif
#ifndef PG_STANDALONE
extern int DebugFileOpen(void);
#endif
#endif /* ELOG_H */