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Add SET statement_timeout capability. Timeout is in ms. A value of

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zero turns off the timer.
This commit is contained in:
Bruce Momjian 2002-07-13 01:02:14 +00:00
parent ccb3f90f06
commit 4db8718e84
8 changed files with 200 additions and 43 deletions
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12
doc/src/sgml/runtime.sgml
View File

@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.120 2002/07/05 01:17:20 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.121 2002/07/13 01:02:14 momjian Exp $
-->
<Chapter Id="runtime">
@ -1584,6 +1584,16 @@ dynamic_library_path = '/usr/local/lib/postgresql:/home/my_project/lib:$libdir'
</listitem>
</varlistentry>
<varlistentry>
<term><varname>STATEMENT_TIMEOUT</varname> (<type>integer</type>)</term>
<listitem>
<para>
Aborts any statement that takes over the specified number of
microseconds. A value of zero turns off the timer.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>SHARED_BUFFERS</varname> (<type>integer</type>)</term>
<listitem>

6
src/backend/postmaster/postmaster.c
View File

@ -37,7 +37,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.280 2002/06/20 20:29:33 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.281 2002/07/13 01:02:14 momjian Exp $
*
* NOTES
*
@ -2105,7 +2105,7 @@ DoBackend(Port *port)
* after a time delay, so that a broken client can't hog a connection
* indefinitely. PreAuthDelay doesn't count against the time limit.
*/
if (!enable_sigalrm_interrupt(AuthenticationTimeout * 1000))
if (!enable_sig_alarm(AuthenticationTimeout * 1000, false))
elog(FATAL, "DoBackend: Unable to set timer for auth timeout");
/*
@ -2134,7 +2134,7 @@ DoBackend(Port *port)
* Done with authentication. Disable timeout, and prevent
* SIGTERM/SIGQUIT again until backend startup is complete.
*/
if (!disable_sigalrm_interrupt())
if (!disable_sig_alarm(false))
elog(FATAL, "DoBackend: Unable to disable timer for auth timeout");
PG_SETMASK(&BlockSig);

180
src/backend/storage/lmgr/proc.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.121 2002/06/20 20:29:35 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.122 2002/07/13 01:02:14 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -52,8 +52,10 @@
#include "storage/sinval.h"
#include "storage/spin.h"
int DeadlockTimeout = 1000;
int StatementTimeout = 0;
int RemainingStatementTimeout = 0;
bool alarm_is_statement_timeout = false;
PGPROC *MyProc = NULL;
@ -319,7 +321,7 @@ LockWaitCancel(void)
waitingForLock = false;
/* Turn off the deadlock timer, if it's still running (see ProcSleep) */
disable_sigalrm_interrupt();
disable_sig_alarm(false);
/* Unlink myself from the wait queue, if on it (might not be anymore!) */
LWLockAcquire(LockMgrLock, LW_EXCLUSIVE);
@ -600,7 +602,7 @@ ProcSleep(LOCKMETHODTABLE *lockMethodTable,
/*
* If we detected deadlock, give up without waiting. This must agree
* with HandleDeadLock's recovery code, except that we shouldn't
* with CheckDeadLock's recovery code, except that we shouldn't
* release the semaphore since we haven't tried to lock it yet.
*/
if (early_deadlock)
@ -632,13 +634,13 @@ ProcSleep(LOCKMETHODTABLE *lockMethodTable,
* By delaying the check until we've waited for a bit, we can avoid
* running the rather expensive deadlock-check code in most cases.
*/
if (!enable_sigalrm_interrupt(DeadlockTimeout))
if (!enable_sig_alarm(DeadlockTimeout, false))
elog(FATAL, "ProcSleep: Unable to set timer for process wakeup");
/*
* If someone wakes us between LWLockRelease and PGSemaphoreLock,
* PGSemaphoreLock will not block. The wakeup is "saved" by the
* semaphore implementation. Note also that if HandleDeadLock is
* semaphore implementation. Note also that if CheckDeadLock is
* invoked but does not detect a deadlock, PGSemaphoreLock() will
* continue to wait. There used to be a loop here, but it was useless
* code...
@ -654,7 +656,7 @@ ProcSleep(LOCKMETHODTABLE *lockMethodTable,
/*
* Disable the timer, if it's still running
*/
if (!disable_sigalrm_interrupt())
if (!disable_sig_alarm(false))
elog(FATAL, "ProcSleep: Unable to disable timer for process wakeup");
/*
@ -785,7 +787,7 @@ ProcLockWakeup(LOCKMETHODTABLE *lockMethodTable, LOCK *lock)
* --------------------
*/
void
HandleDeadLock(SIGNAL_ARGS)
CheckDeadLock(void)
{
int save_errno = errno;
@ -921,52 +923,180 @@ ProcSendSignal(BackendId procId)
* Delay is given in milliseconds. Caller should be sure a SIGALRM
* signal handler is installed before this is called.
*
* This code properly handles multiple alarms when the statement_timeout
* alarm is specified first.
*
* Returns TRUE if okay, FALSE on failure.
*/
bool
enable_sigalrm_interrupt(int delayms)
enable_sig_alarm(int delayms, bool is_statement_timeout)
{
#ifndef __BEOS__
struct itimerval timeval,
dummy;
struct itimerval timeval, remaining;
#else
bigtime_t time_interval, remaining;
#endif
/* Don't set timer if the statement timeout scheduled before next alarm. */
if (alarm_is_statement_timeout &&
!is_statement_timeout &&
RemainingStatementTimeout <= delayms)
return true;
#ifndef __BEOS__
MemSet(&timeval, 0, sizeof(struct itimerval));
timeval.it_value.tv_sec = delayms / 1000;
timeval.it_value.tv_usec = (delayms % 1000) * 1000;
if (setitimer(ITIMER_REAL, &timeval, &dummy))
if (setitimer(ITIMER_REAL, &timeval, &remaining))
return false;
#else
/* BeOS doesn't have setitimer, but has set_alarm */
bigtime_t time_interval;
time_interval = delayms * 1000; /* usecs */
if (set_alarm(time_interval, B_ONE_SHOT_RELATIVE_ALARM) < 0)
if ((remaining = set_alarm(time_interval, B_ONE_SHOT_RELATIVE_ALARM)) < 0)
return false;
#endif
if (is_statement_timeout)
RemainingStatementTimeout = StatementTimeout;
else
{
/* Switching to non-statement-timeout alarm, get remaining time */
if (alarm_is_statement_timeout)
{
#ifndef __BEOS__
/* We lose precision here because we convert to milliseconds */
RemainingStatementTimeout = remaining.it_value.tv_sec * 1000 +
remaining.it_value.tv_usec / 1000;
#else
RemainingStatementTimeout = remaining / 1000;
#endif
/* Rounding could cause a zero */
if (RemainingStatementTimeout == 0)
RemainingStatementTimeout = 1;
}
if (RemainingStatementTimeout)
{
/* Remaining timeout alarm < delayms? */
if (RemainingStatementTimeout <= delayms)
{
/* reinstall statement timeout alarm */
alarm_is_statement_timeout = true;
#ifndef __BEOS__
remaining.it_value.tv_sec = RemainingStatementTimeout / 1000;
remaining.it_value.tv_usec = (RemainingStatementTimeout % 1000) * 1000;
if (setitimer(ITIMER_REAL, &remaining, &timeval))
return false;
else
return true;
#else
remaining = RemainingStatementTimeout * 1000;
if ((timeval = set_alarm(remaining, B_ONE_SHOT_RELATIVE_ALARM)) < 0)
return false;
else
return true;
#endif
}
else
RemainingStatementTimeout -= delayms;
}
}
if (is_statement_timeout)
alarm_is_statement_timeout = true;
else
alarm_is_statement_timeout = false;
return true;
}
/*
* Disable the SIGALRM interrupt, if it has not yet fired
* Cancel the SIGALRM timer.
*
* This is also called if the timer has fired to reschedule
* the statement_timeout timer.
*
* Returns TRUE if okay, FALSE on failure.
*/
bool
disable_sigalrm_interrupt(void)
disable_sig_alarm(bool is_statement_timeout)
{
#ifndef __BEOS__
struct itimerval timeval,
dummy;
struct itimerval timeval, remaining;
MemSet(&timeval, 0, sizeof(struct itimerval));
if (setitimer(ITIMER_REAL, &timeval, &dummy))
return false;
#else
/* BeOS doesn't have setitimer, but has set_alarm */
if (set_alarm(B_INFINITE_TIMEOUT, B_PERIODIC_ALARM) < 0)
return false;
bigtime_t time_interval = 0;
#endif
if (!is_statement_timeout && RemainingStatementTimeout)
{
#ifndef __BEOS__
/* turn off timer and get remaining time, if any */
if (setitimer(ITIMER_REAL, &timeval, &remaining))
return false;
/* Add remaining time back because the timer didn't complete */
RemainingStatementTimeout += remaining.it_value.tv_sec * 1000 +
remaining.it_value.tv_usec / 1000;
/* Prepare to set timer */
timeval.it_value.tv_sec = RemainingStatementTimeout / 1000;
timeval.it_value.tv_usec = (RemainingStatementTimeout % 1000) * 1000;
#else
/* BeOS doesn't have setitimer, but has set_alarm */
if ((time_interval = set_alarm(B_INFINITE_TIMEOUT, B_PERIODIC_ALARM)) < 0)
return false;
RemainingStatementTimeout += time_interval / 1000;
time_interval = RemainingStatementTimeout * 1000;
#endif
/* Restore remaining statement timeout value */
alarm_is_statement_timeout = true;
}
/*
* Optimization: is_statement_timeout && RemainingStatementTimeout == 0
* does nothing. This is for cases where no timeout was set.
*/
if (!is_statement_timeout || RemainingStatementTimeout)
{
#ifndef __BEOS__
if (setitimer(ITIMER_REAL, &timeval, &remaining))
return false;
#else
if (time_interval)
{
if (set_alarm(time_interval, B_ONE_SHOT_RELATIVE_ALARM) < 0)
return false;
}
else
{
if (set_alarm(B_INFINITE_TIMEOUT, B_PERIODIC_ALARM) < 0)
return false;
}
#endif
}
if (is_statement_timeout)
RemainingStatementTimeout = 0;
return true;
}
/*
* Call alarm handler, either StatementCancel or Deadlock checker.
*/
void
handle_sig_alarm(SIGNAL_ARGS)
{
if (alarm_is_statement_timeout)
{
RemainingStatementTimeout = 0;
alarm_is_statement_timeout = false;
kill(MyProcPid, SIGINT);
}
else
{
CheckDeadLock();
/* Reactivate any statement_timeout alarm. */
disable_sig_alarm(false);
}
}

24
src/backend/tcop/postgres.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.269 2002/07/11 07:39:26 ishii Exp $
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.270 2002/07/13 01:02:14 momjian Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@ -78,6 +78,8 @@ char *debug_query_string; /* used by pgmonitor */
/* Note: whereToSendOutput is initialized for the bootstrap/standalone case */
CommandDest whereToSendOutput = Debug;
extern int StatementTimeout;
static bool dontExecute = false;
/* note: these declarations had better match tcopprot.h */
@ -717,6 +719,9 @@ pg_exec_query_string(StringInfo query_string, /* string to execute */
xact_started = true;
}
if (StatementTimeout)
enable_sig_alarm(StatementTimeout, true);
/*
* If we got a cancel signal in analysis or prior command,
* quit
@ -791,6 +796,8 @@ pg_exec_query_string(StringInfo query_string, /* string to execute */
ShowUsage("EXECUTOR STATISTICS");
}
disable_sig_alarm(true);
/*
* In a query block, we want to increment the command counter
* between queries so that the effects of early queries are
@ -821,9 +828,7 @@ pg_exec_query_string(StringInfo query_string, /* string to execute */
finish_xact_command();
xact_started = false;
}
} /* end loop over queries generated from a
* parsetree */
} /* end loop over queries generated from a parsetree */
/*
* If this is the last parsetree of the query string, close down
@ -996,7 +1001,7 @@ authdie(SIGNAL_ARGS)
* at soonest convenient time
*/
static void
QueryCancelHandler(SIGNAL_ARGS)
StatementCancelHandler(SIGNAL_ARGS)
{
int save_errno = errno;
@ -1551,10 +1556,10 @@ PostgresMain(int argc, char *argv[], const char *username)
*/
pqsignal(SIGHUP, SigHupHandler); /* set flag to read config file */
pqsignal(SIGINT, QueryCancelHandler); /* cancel current query */
pqsignal(SIGINT, StatementCancelHandler); /* cancel current query */
pqsignal(SIGTERM, die); /* cancel current query and exit */
pqsignal(SIGQUIT, quickdie); /* hard crash time */
pqsignal(SIGALRM, HandleDeadLock); /* check for deadlock after
pqsignal(SIGALRM, handle_sig_alarm); /* check for deadlock after
* timeout */
/*
@ -1688,7 +1693,7 @@ PostgresMain(int argc, char *argv[], const char *username)
if (!IsUnderPostmaster)
{
puts("\nPOSTGRES backend interactive interface ");
puts("$Revision: 1.269 $ $Date: 2002/07/11 07:39:26 $\n");
puts("$Revision: 1.270 $ $Date: 2002/07/13 01:02:14 $\n");
}
/*
@ -1820,6 +1825,9 @@ PostgresMain(int argc, char *argv[], const char *username)
QueryCancelPending = false; /* forget any earlier CANCEL
* signal */
/* Stop any statement timer */
disable_sig_alarm(true);
EnableNotifyInterrupt();
/* Allow "die" interrupt to be processed while waiting */

8
src/backend/utils/misc/guc.c
View File

@ -5,7 +5,7 @@
* command, configuration file, and command line options.
* See src/backend/utils/misc/README for more information.
*
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.70 2002/06/16 00:09:12 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.71 2002/07/13 01:02:14 momjian Exp $
*
* Copyright 2000 by PostgreSQL Global Development Group
* Written by Peter Eisentraut <peter_e@gmx.net>.
@ -51,6 +51,7 @@
extern bool Log_connections;
extern int PreAuthDelay;
extern int AuthenticationTimeout;
extern int StatementTimeout;
extern int CheckPointTimeout;
extern int CommitDelay;
extern int CommitSiblings;
@ -575,6 +576,11 @@ static struct config_int
DEFAULT_MAX_EXPR_DEPTH, 10, INT_MAX, NULL, NULL
},
{
{ "statement_timeout", PGC_USERSET }, &StatementTimeout,
0, 0, INT_MAX, NULL, NULL
},
{
{ "max_fsm_relations", PGC_POSTMASTER }, &MaxFSMRelations,
100, 10, INT_MAX, NULL, NULL

1
src/backend/utils/misc/postgresql.conf.sample
View File

@ -200,3 +200,4 @@
#password_encryption = true
#sql_inheritance = true
#transform_null_equals = false
#statement_timeout = 0 # 0 is disabled

3
src/bin/psql/tab-complete.c
View File

@ -3,7 +3,7 @@
*
* Copyright 2000 by PostgreSQL Global Development Group
*
* $Header: /cvsroot/pgsql/src/bin/psql/tab-complete.c,v 1.50 2002/06/16 00:09:12 momjian Exp $
* $Header: /cvsroot/pgsql/src/bin/psql/tab-complete.c,v 1.51 2002/07/13 01:02:14 momjian Exp $
*/
/*----------------------------------------------------------------------
@ -267,6 +267,7 @@ psql_completion(char *text, int start, int end)
"default_transaction_isolation",
"search_path",
"statement_timeout",
NULL
};

9
src/include/storage/proc.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: proc.h,v 1.57 2002/06/20 20:29:52 momjian Exp $
* $Id: proc.h,v 1.58 2002/07/13 01:02:14 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -105,13 +105,14 @@ extern int ProcSleep(LOCKMETHODTABLE *lockMethodTable, LOCKMODE lockmode,
extern PGPROC *ProcWakeup(PGPROC *proc, int errType);
extern void ProcLockWakeup(LOCKMETHODTABLE *lockMethodTable, LOCK *lock);
extern bool LockWaitCancel(void);
extern void HandleDeadLock(SIGNAL_ARGS);
extern void CheckDeadLock(void);
extern void ProcWaitForSignal(void);
extern void ProcCancelWaitForSignal(void);
extern void ProcSendSignal(BackendId procId);
extern bool enable_sigalrm_interrupt(int delayms);
extern bool disable_sigalrm_interrupt(void);
extern bool enable_sig_alarm(int delayms, bool is_statement_timeout);
extern bool disable_sig_alarm(bool is_statement_timeout);
extern void handle_sig_alarm(SIGNAL_ARGS);
#endif /* PROC_H */