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Add pg_postmaster_start_time() function.
Euler Taveira de Oliveira Matthias Schmidt
1 parent b5e65c8 commit f5835b4

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6 files changed

+65
-6
lines changed

6 files changed

+65
-6
lines changed

‎doc/src/sgml/func.sgml

Lines changed: 16 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
<!--
2-
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.254 2005/06/13 02:40:04 neilc Exp $
2+
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.255 2005/06/14 21:04:38 momjian Exp $
33
PostgreSQL documentation
44
-->
55

@@ -8119,6 +8119,12 @@ select current_date + s.a as dates from generate_series(0,14,7) as s(a);
81198119
<entry>session user name</entry>
81208120
</row>
81218121

8122+
<row>
8123+
<entry><function>pg_postmaster_start_time()</function></entry>
8124+
<entry><type>timestamp with time zone</type></entry>
8125+
<entry><command>postmaster</> start time</entry>
8126+
</row>
8127+
81228128
<row>
81238129
<entry><function>user</function></entry>
81248130
<entry><type>name</type></entry>
@@ -8216,6 +8222,15 @@ SET search_path TO <replaceable>schema</> <optional>, <replaceable>schema</>, ..
82168222
Unix-domain socket.
82178223
</para>
82188224

8225+
<indexterm zone="functions-info">
8226+
<primary>pg_postmaster_start_time</primary>
8227+
</indexterm>
8228+
8229+
<para>
8230+
<function>pg_postmaster_start_time()</function> returns the timestamp with time zone
8231+
when the <command>postmaster</> started.
8232+
</para>
8233+
82198234
<indexterm zone="functions-info">
82208235
<primary>version</primary>
82218236
</indexterm>

‎src/backend/postmaster/postmaster.c

Lines changed: 16 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -37,7 +37,7 @@
3737
*
3838
*
3939
* IDENTIFICATION
40-
* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.452 2005/06/09 22:01:12 tgl Exp $
40+
* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.453 2005/06/14 21:04:39 momjian Exp $
4141
*
4242
* NOTES
4343
*
@@ -222,6 +222,9 @@ static bool FatalError = false; /* T if recovering from backend crash */
222222
bool ClientAuthInProgress = false; /* T during new-client
223223
* authentication */
224224

225+
/* Backend startup time */
226+
TimestampTz StartTime;
227+
225228
/*
226229
* State for assigning random salts and cancel keys.
227230
* Also, the global MyCancelKey passes the cancel key assigned to a given
@@ -330,6 +333,7 @@ typedef struct
330333
InheritableSocket pgStatPipe0;
331334
InheritableSocket pgStatPipe1;
332335
pid_t PostmasterPid;
336+
TimestampTz StartTime;
333337
#ifdef WIN32
334338
HANDLE PostmasterHandle;
335339
HANDLE initial_signal_pipe;
@@ -372,6 +376,9 @@ PostmasterMain(int argc, char *argv[])
372376
char *userDoption = NULL;
373377
int i;
374378

379+
AbsoluteTime StartTimeSec; /* integer part */
380+
int StartTimeUSec; /* microsecond part */
381+
375382
/* This will call exit() if strdup() fails. */
376383
progname = get_progname(argv[0]);
377384

@@ -914,6 +921,12 @@ PostmasterMain(int argc, char *argv[])
914921
*/
915922
StartupPID = StartupDataBase();
916923

924+
/*
925+
* Get start up time
926+
*/
927+
StartTimeSec = GetCurrentAbsoluteTimeUsec(&StartTimeUSec);
928+
StartTime = AbsoluteTimeUsecToTimestampTz(StartTimeSec, StartTimeUSec);
929+
917930
status = ServerLoop();
918931

919932
/*
@@ -3603,6 +3616,7 @@ save_backend_variables(BackendParameters *param, Port *port,
36033616
write_inheritable_socket(&param->pgStatPipe1, pgStatPipe[1], childPid);
36043617

36053618
param->PostmasterPid = PostmasterPid;
3619+
param->StartTime = StartTime;
36063620

36073621
#ifdef WIN32
36083622
param->PostmasterHandle = PostmasterHandle;
@@ -3805,6 +3819,7 @@ restore_backend_variables(BackendParameters *param, Port *port)
38053819
read_inheritable_socket(&pgStatPipe[1], &param->pgStatPipe1);
38063820

38073821
PostmasterPid = param->PostmasterPid;
3822+
StartTime = param->StartTime;
38083823

38093824
#ifdef WIN32
38103825
PostmasterHandle = param->PostmasterHandle;

‎src/backend/tcop/postgres.c

Lines changed: 16 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.447 2005/06/03 23:05:29 tgl Exp $
11+
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.448 2005/06/14 21:04:40 momjian Exp $
1212
*
1313
* NOTES
1414
* this is the "main" module of the postgres backend and
@@ -149,6 +149,9 @@ static int UseNewLine = 0; /* Use EOF as query delimiters */
149149
#endif /* TCOP_DONTUSENEWLINE */
150150

151151

152+
/* Backend startup time */
153+
TimestampTz StartTime;
154+
152155
/* ----------------------------------------------------------------
153156
* decls for routines only used in this file
154157
* ----------------------------------------------------------------
@@ -2380,6 +2383,9 @@ PostgresMain(int argc, char *argv[], const char *username)
23802383
sigjmp_buf local_sigjmp_buf;
23812384
volatile bool send_rfq = true;
23822385

2386+
AbsoluteTime StartTimeSec; /* integer part */
2387+
int StartTimeUSec; /* microsecond part */
2388+
23832389
#define PendingConfigOption(name,val) \
23842390
(guc_names = lappend(guc_names, pstrdup(name)), \
23852391
guc_values = lappend(guc_values, pstrdup(val)))
@@ -2969,6 +2975,15 @@ PostgresMain(int argc, char *argv[], const char *username)
29692975
*/
29702976
pgstat_bestart();
29712977

2978+
/*
2979+
* Get stand-alone backend startup time
2980+
*/
2981+
if (!IsUnderPostmaster)
2982+
{
2983+
StartTimeSec = GetCurrentAbsoluteTimeUsec(&StartTimeUSec);
2984+
StartTime = AbsoluteTimeUsecToTimestampTz(StartTimeSec, StartTimeUSec);
2985+
}
2986+
29722987
/*
29732988
* POSTGRES main processing loop begins here
29742989
*

‎src/backend/utils/adt/timestamp.c

Lines changed: 7 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.124 2005/05/26 02:04:13 neilc Exp $
11+
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.125 2005/06/14 21:04:40 momjian Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -938,6 +938,12 @@ now(PG_FUNCTION_ARGS)
938938
PG_RETURN_TIMESTAMPTZ(result);
939939
}
940940

941+
Datum
942+
pgsql_postmaster_start_time(PG_FUNCTION_ARGS)
943+
{
944+
PG_RETURN_TIMESTAMPTZ(StartTime);
945+
}
946+
941947
void
942948
dt2time(Timestamp jd, int *hour, int *min, int *sec, fsec_t *fsec)
943949
{

‎src/include/catalog/pg_proc.h

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.366 2005/06/13 02:26:50 tgl Exp $
10+
* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.367 2005/06/14 21:04:41 momjian Exp $
1111
*
1212
* NOTES
1313
* The script catalog/genbki.sh reads this file and generates .bki
@@ -3651,6 +3651,10 @@ DESCR("convert boolean to int4");
36513651
DATA(insert OID = 2559 ( lastval PGNSP PGUID 12 f f t f v 0 20 "" _null_ _null_ _null_ lastval - _null_ ));
36523652
DESCR("current value from last used sequence");
36533653

3654+
/* start time function */
3655+
DATA(insert OID = 2560 ( pg_postmaster_start_time PGNSP PGUID 12 f f t f s 0 1184 "" _null_ _null_ _null_ pgsql_postmaster_start_time - _null_ ));
3656+
DESCR("postmaster start time");
3657+
36543658

36553659
/*
36563660
* Symbolic values for provolatile column: these indicate whether the result

‎src/include/utils/timestamp.h

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,7 @@
66
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
77
* Portions Copyright (c) 1994, Regents of the University of California
88
*
9-
* $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.43 2005/05/25 21:40:42 momjian Exp $
9+
* $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.44 2005/06/14 21:04:42 momjian Exp $
1010
*
1111
*-------------------------------------------------------------------------
1212
*/
@@ -256,6 +256,10 @@ extern Datum timestamptz_part(PG_FUNCTION_ARGS);
256256

257257
extern Datum now(PG_FUNCTION_ARGS);
258258

259+
extern Datum pgsql_postmaster_start_time(PG_FUNCTION_ARGS);
260+
261+
extern TimestampTz StartTime;
262+
259263
/* Internal routines (not fmgr-callable) */
260264

261265
extern int tm2timestamp(struct pg_tm * tm, fsec_t fsec, int *tzp, Timestamp *dt);

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