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Commit09c5e84

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Change elog(ERROR) to get back to main loop via a plain sigsetjmp,
instead of doing a kill(self, SIGQUIT) and expecting the signal handlerto do it. Also, clean up inconsistent definitions of the sigjmp bufferin the several files that already referenced it.
1 parentd30e2ac commit09c5e84

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6 files changed

+45
-90
lines changed

6 files changed

+45
-90
lines changed

‎src/backend/bootstrap/bootstrap.c‎

Lines changed: 1 addition & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Copyright (c) 1994, Regents of the University of California
88
*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/bootstrap/bootstrap.c,v 1.57 1999/03/25 03:49:25 tgl Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/bootstrap/bootstrap.c,v 1.58 1999/04/20 02:19:53 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -184,24 +184,6 @@ static char *values[MAXATTR];/* cooresponding attribute values */
184184
intnumattr;/* number of attributes for cur. rel */
185185
externbooldisableFsync;/* do not fsync the database */
186186

187-
/* The test for HAVE_SIGSETJMP fails on Linux 2.0.x because the test
188-
*explicitly disallows sigsetjmp being a #define, which is how it
189-
*is declared in Linux. So, to avoid compiler warnings about
190-
*sigsetjmp() being redefined, let's not redefine unless necessary.
191-
* - thomas 1997-12-27
192-
*/
193-
194-
#if !defined(HAVE_SIGSETJMP)&& !defined(sigsetjmp)
195-
staticjmp_bufWarn_restart;
196-
197-
#definesigsetjmp(x,y)setjmp(x)
198-
#definesiglongjmp longjmp
199-
200-
#else
201-
staticsigjmp_bufWarn_restart;
202-
203-
#endif
204-
205187
intDebugMode;
206188
staticGlobalMemorynogc= (GlobalMemory)NULL;/* special no-gc mem
207189
* context */

‎src/backend/tcop/postgres.c‎

Lines changed: 13 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
88
*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.106 1999/03/22 16:45:27 momjian Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.107 1999/04/20 02:19:53 tgl Exp $
1111
*
1212
* NOTES
1313
* this is the "main" module of the postgres backend and
@@ -21,7 +21,6 @@
2121
#include<string.h>
2222
#include<signal.h>
2323
#include<time.h>
24-
#include<setjmp.h>
2524
#include<sys/time.h>
2625
#include<sys/types.h>
2726
#include<fcntl.h>
@@ -136,15 +135,8 @@ static bool IsEmptyQuery = false;
136135

137136
charrelname[80];/* current relation name */
138137

139-
#if defined(nextstep)
140-
jmp_bufWarn_restart;
141-
142-
#definesigsetjmp(x,y)setjmp(x)
143-
#definesiglongjmp longjmp
144-
#else
138+
/* note: these declarations had better match tcopprot.h */
145139
DLLIMPORTsigjmp_bufWarn_restart;
146-
147-
#endif/* defined(nextstep) */
148140
boolInError;
149141

150142
externintNBuffers;
@@ -829,8 +821,15 @@ pg_exec_query_dest(char *query_string,/* string to execute */
829821
/* --------------------------------
830822
*signal handler routines used in PostgresMain()
831823
*
832-
*handle_warn() is used to catch kill(getpid(),SIGQUIT) which
833-
*occurs when elog(ERROR) is called.
824+
*handle_warn() catches SIGQUIT. It forces control back to the main
825+
*loop, just as if an internal error (elog(ERROR,...)) had occurred.
826+
*elog() used to actually use kill(2) to induce a SIGQUIT to get here!
827+
*But that's not 100% reliable on some systems, so now it does its own
828+
*siglongjmp() instead.
829+
*We still provide the signal catcher so that an error quit can be
830+
*forced externally. This should be done only with great caution,
831+
*however, since an asynchronous signal could leave the system in
832+
*who-knows-what inconsistent state.
834833
*
835834
*quickdie() occurs when signalled by the postmaster.
836835
*Some backend has bought the farm,
@@ -1531,7 +1530,7 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
15311530
if (!IsUnderPostmaster)
15321531
{
15331532
puts("\nPOSTGRES backend interactive interface ");
1534-
puts("$Revision: 1.106 $ $Date: 1999/03/22 16:45:27 $\n");
1533+
puts("$Revision: 1.107 $ $Date: 1999/04/20 02:19:53 $\n");
15351534
}
15361535

15371536
/* ----------------
@@ -1543,8 +1542,7 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
15431542
*so that the slaves signal the master to abort the transaction
15441543
*rather than calling AbortCurrentTransaction() themselves.
15451544
*
1546-
*Note: elog(ERROR) causes a kill(getpid(),SIGQUIT) to occur
1547-
* sending us back here.
1545+
*Note: elog(ERROR) does a siglongjmp() to transfer control here.
15481546
* ----------------
15491547
*/
15501548

‎src/backend/utils/error/elog.c‎

Lines changed: 4 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
88
*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/utils/error/elog.c,v 1.40 1999/04/16 06:38:17 ishii Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/utils/error/elog.c,v 1.41 1999/04/20 02:19:54 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -32,6 +32,7 @@
3232
#include"miscadmin.h"
3333
#include"libpq/libpq.h"
3434
#include"storage/proc.h"
35+
#include"tcop/tcopprot.h"
3536
#include"utils/trace.h"
3637

3738
#ifdefUSE_SYSLOG
@@ -216,24 +217,12 @@ elog(int lev, const char *fmt,...)
216217

217218
if (lev==ERROR)
218219
{
219-
externboolInError;
220-
221220
ProcReleaseSpins(NULL);/* get rid of spinlocks we hold */
222221
if (!InError)
223222
{
224-
if (MyProcPid==0) {
225-
kill(getpid(),SIGQUIT);
226-
}else {
227-
kill(MyProcPid,SIGQUIT);/* abort to traffic cop */
228-
}
229-
pause();
223+
/* exit to main loop */
224+
siglongjmp(Warn_restart,1);
230225
}
231-
232-
/*
233-
* The pause(3) is just to avoid race conditions where the thread
234-
* of control on an MP system gets past here (i.e., the signal is
235-
* not received instantaneously).
236-
*/
237226
}
238227

239228
if (lev==FATAL)

‎src/include/tcop/tcopprot.h‎

Lines changed: 23 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,7 @@
66
*
77
* Copyright (c) 1994, Regents of the University of California
88
*
9-
* $Id: tcopprot.h,v 1.17 1999/02/13 23:22:13 momjian Exp $
9+
* $Id: tcopprot.h,v 1.18 1999/04/20 02:19:55 tgl Exp $
1010
*
1111
* OLD COMMENTS
1212
* This file was created so that other c files could get the two
@@ -18,8 +18,26 @@
1818
#ifndefTCOPPROT_H
1919
#defineTCOPPROT_H
2020

21-
#include<executor/execdesc.h>
22-
#include<parser/parse_node.h>
21+
#include<setjmp.h>
22+
#include"executor/execdesc.h"
23+
#include"parser/parse_node.h"
24+
25+
/* Autoconf's test for HAVE_SIGSETJMP fails on Linux 2.0.x because the test
26+
*explicitly disallows sigsetjmp being a #define, which is how it
27+
*is declared in Linux. So, to avoid compiler warnings about
28+
*sigsetjmp() being redefined, let's not redefine unless necessary.
29+
* - thomas 1997-12-27
30+
* Autoconf really ought to be brighter about macro-ized system functions...
31+
* and this code really ought to be in config.h ...
32+
*/
33+
34+
#if !defined(HAVE_SIGSETJMP)&& !defined(sigsetjmp)
35+
#definesigjmp_buf jmp_buf
36+
#definesigsetjmp(x,y)setjmp(x)
37+
#definesiglongjmp longjmp
38+
#endif
39+
externDLLIMPORTsigjmp_bufWarn_restart;
40+
externboolInError;
2341

2442
#ifndefBOOTSTRAP_INCLUDE
2543
externList*pg_parse_and_plan(char*query_string,Oid*typev,intnargs,
@@ -30,7 +48,7 @@ extern void pg_exec_query_acl_override(char *query_string);
3048
externvoid
3149
pg_exec_query_dest(char*query_string,CommandDestdest,boolaclOverride);
3250

33-
#endif/*BOOTSTRAP_HEADER */
51+
#endif/*BOOTSTRAP_INCLUDE */
3452

3553
externvoidhandle_warn(SIGNAL_ARGS);
3654
externvoidquickdie(SIGNAL_ARGS);
@@ -42,4 +60,4 @@ extern int PostgresMain(int argc, char *argv[],
4260
externvoidResetUsage(void);
4361
externvoidShowUsage(void);
4462

45-
#endif/*tcopprotIncluded */
63+
#endif/*TCOPPROT_H */

‎src/pl/plpgsql/src/pl_exec.c‎

Lines changed: 2 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@
33
* procedural language
44
*
55
* IDENTIFICATION
6-
* $Header: /cvsroot/pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.8 1999/03/22 16:45:30 momjian Exp $
6+
* $Header: /cvsroot/pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.9 1999/04/20 02:19:57 tgl Exp $
77
*
88
* This software is copyrighted by Jan Wieck - Hamburg.
99
*
@@ -55,28 +55,12 @@
5555
#include"fmgr.h"
5656
#include"access/heapam.h"
5757

58+
#include"tcop/tcopprot.h"
5859
#include"utils/syscache.h"
5960
#include"catalog/pg_proc.h"
6061
#include"catalog/pg_type.h"
6162

6263

63-
/************************************************************
64-
* Make Warn_restart from tcop/postgres.c visible for us.
65-
* The longjmp() mechanism of the elog(ERROR,...) makes it
66-
* impossible for us to call exceptions. But at least I
67-
* would like some suggestions about where in the PL function
68-
* the error occured.
69-
*
70-
* It's ugly - Jan
71-
************************************************************/
72-
#if defined(nextstep)
73-
#definesigjmp_bufjmp_buf
74-
#definesigsetjmp(x,y)setjmp(x)
75-
#definesiglongjmplongjmp
76-
#endif
77-
78-
externDLLIMPORTsigjmp_bufWarn_restart;/* in tcop/postgres.c */
79-
8064
staticPLpgSQL_function*error_info_func=NULL;
8165
staticPLpgSQL_stmt*error_info_stmt=NULL;
8266
staticchar*error_info_text=NULL;

‎src/pl/tcl/pltcl.c‎

Lines changed: 2 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@
33
* procedural language (PL)
44
*
55
* IDENTIFICATION
6-
* $Header: /cvsroot/pgsql/src/pl/tcl/pltcl.c,v 1.8 1998/11/27 20:05:27 vadim Exp $
6+
* $Header: /cvsroot/pgsql/src/pl/tcl/pltcl.c,v 1.9 1999/04/20 02:19:59 tgl Exp $
77
*
88
* This software is copyrighted by Jan Wieck - Hamburg.
99
*
@@ -52,6 +52,7 @@
5252
#include"fmgr.h"
5353
#include"access/heapam.h"
5454

55+
#include"tcop/tcopprot.h"
5556
#include"utils/syscache.h"
5657
#include"catalog/pg_proc.h"
5758
#include"catalog/pg_type.h"
@@ -90,23 +91,6 @@ typedef struct pltcl_query_desc
9091
}pltcl_query_desc;
9192

9293

93-
/************************************************************
94-
* Make Warn_restart from tcop/postgres.c visible for us.
95-
* The longjmp() mechanism of the elog(ERROR,...) restart let's
96-
* interpreter levels lay around. So we must tidy up in that
97-
* case and thus, we have to catch the longjmp's sometimes to
98-
* return though all the interpreter levels back.
99-
*
100-
* It's ugly - Jan
101-
************************************************************/
102-
#if defined(nextstep)
103-
#definesigjmp_bufjmp_buf
104-
#definesigsetjmp(x,y)setjmp(x)
105-
#definesiglongjmplongjmp
106-
#endif
107-
108-
externsigjmp_bufWarn_restart;/* in tcop/postgres.c */
109-
11094
/**********************************************************************
11195
* Global data
11296
**********************************************************************/

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