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Patch from Massimo Dal Zotto <dz@cs.unitn.it>

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The following patches add to the backend a new debugging flag -K which prints
a debug trace of all locking operations on user relations (those with oid
greater than 20000). The code is compiled only if LOCK_MGR_DEBUG is defined,
so the patch should be harmless if not explicitly enabled.
I'm using the code to trace deadlock conditions caused by application queries
using the command "$POSTMASTER -D $PGDATA -o '-d 1 -K 1'.
The patches are for version 6.0 dated 970126.
This commit is contained in:
Marc G. Fournier
1997-02-12 05:25:13 +00:00
parent ba82bb3eac
commit fb70587c1d
4 changed files with 161 additions and 40 deletions
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25
src/backend/tcop/postgres.c
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.29 1997/02/03 04:43:31 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.30 1997/02/12 05:24:22 scrappy Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@@ -91,6 +91,9 @@ static bool DebugPrintRewrittenParsetree = false;
/*static bool EnableRewrite = true; , never changes why have it*/
CommandDest whereToSendOutput;
#ifdef LOCK_MGR_DEBUG
extern int lockDebug;
#endif
extern int lockingOff;
extern int NBuffers;
@@ -757,6 +760,9 @@ static void usage(char* progname)
fprintf(stderr, " F: turn off fsync\n");
fprintf(stderr, " f: forbid plantype generation\n");
fprintf(stderr, " i: don't execute the query, just show the plan tree\n");
#ifdef LOCK_MGR_DEBUG
fprintf(stderr, " K: set locking debug level [0|1|2]\n");
#endif
fprintf(stderr, " L: turn off locking\n");
fprintf(stderr, " m: set up a listening backend at portno to support multiple front-ends\n");
fprintf(stderr, " M: start as postmaster\n");
@@ -846,7 +852,10 @@ PostgresMain(int argc, char *argv[])
*/
flagC = flagQ = flagS = flagE = flagEu = ShowStats = 0;
ShowParserStats = ShowPlannerStats = ShowExecutorStats = 0;
#ifdef LOCK_MGR_DEBUG
lockDebug = 0;
#endif
/* get hostname is either the environment variable PGHOST
or 'localhost' */
if (!(hostName = getenv("PGHOST"))) {
@@ -858,7 +867,7 @@ PostgresMain(int argc, char *argv[])
DataDir = getenv("PGDATA"); /* default */
multiplexedBackend = false; /* default */
while ((flag = getopt(argc, argv, "B:bCD:d:Eef:iLm:MNo:P:pQSst:x:F"))
while ((flag = getopt(argc, argv, "B:bCD:d:Eef:iK:Lm:MNo:P:pQSst:x:F"))
!= EOF)
switch (flag) {
@@ -955,6 +964,14 @@ PostgresMain(int argc, char *argv[])
dontExecute = 1;
break;
case 'K':
#ifdef LOCK_MGR_DEBUG
lockDebug = atoi(optarg);
#else
fprintf(stderr, "Lock debug not compiled in\n");
#endif
break;
case 'L':
/* --------------------
* turn off locking
@@ -1283,7 +1300,7 @@ PostgresMain(int argc, char *argv[])
*/
if (IsUnderPostmaster == false) {
puts("\nPOSTGRES backend interactive interface");
puts("$Revision: 1.29 $ $Date: 1997/02/03 04:43:31 $");
puts("$Revision: 1.30 $ $Date: 1997/02/12 05:24:22 $");
}
/* ----------------