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Do not accept interrupts in RESUME_INTERRUPTS() and END_CRIT_SECTION()

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macros, but only at explicit CHECK_FOR_INTERRUPTS() calls.  Not clear
whether overenthusiastic acceptance of interrupts accounts for any real
bugs, but it definitely seems risky and unnecessary.
This commit is contained in:
Tom Lane 2002-01-01 23:16:22 +00:00
parent 1ccc67600b
commit 4764ae823b
2 changed files with 5 additions and 9 deletions
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5
src/backend/tcop/postgres.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.243 2001/12/04 19:40:17 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.244 2002/01/01 23:16:22 tgl Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@ -1626,7 +1626,7 @@ PostgresMain(int argc, char *argv[], const char *username)
if (!IsUnderPostmaster)
{
puts("\nPOSTGRES backend interactive interface ");
puts("$Revision: 1.243 $ $Date: 2001/12/04 19:40:17 $\n");
puts("$Revision: 1.244 $ $Date: 2002/01/01 23:16:22 $\n");
}
/*
@ -1703,7 +1703,6 @@ PostgresMain(int argc, char *argv[], const char *username)
/*
* Exit interrupt holdoff section we implicitly established above.
* (This could result in accepting a cancel or die interrupt.)
*/
RESUME_INTERRUPTS();
}

9
src/include/miscadmin.h
View File

@ -12,7 +12,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: miscadmin.h,v 1.97 2001/11/05 17:46:31 momjian Exp $
* $Id: miscadmin.h,v 1.98 2002/01/01 23:16:22 tgl Exp $
*
* NOTES
* some of the information in this file should be moved to
@ -43,7 +43,8 @@
* or die interrupt. The HOLD_INTERRUPTS() and RESUME_INTERRUPTS() macros
* allow code to ensure that no cancel or die interrupt will be accepted,
* even if CHECK_FOR_INTERRUPTS() gets called in a subroutine. The interrupt
* will be held off until the last matching RESUME_INTERRUPTS() occurs.
* will be held off until CHECK_FOR_INTERRUPTS() is done outside any
* HOLD_INTERRUPTS() ... RESUME_INTERRUPTS() section.
*
* Special mechanisms are used to let an interrupt be accepted when we are
* waiting for a lock or when we are waiting for command input (but, of
@ -85,8 +86,6 @@ extern void ProcessInterrupts(void);
do { \
Assert(InterruptHoldoffCount > 0); \
InterruptHoldoffCount--; \
if (InterruptPending) \
ProcessInterrupts(); \
} while(0)
#define START_CRIT_SECTION() (CritSectionCount++)
@ -95,8 +94,6 @@ extern void ProcessInterrupts(void);
do { \
Assert(CritSectionCount > 0); \
CritSectionCount--; \
if (InterruptPending) \
ProcessInterrupts(); \
} while(0)