From f5835b4b8d569e4d7814886f9e7b90c36d8a4fb5 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Tue, 14 Jun 2005 21:04:42 +0000
Subject: [PATCH] Add pg_postmaster_start_time() function.
Euler Taveira de Oliveira
Matthias Schmidt
---
doc/src/sgml/func.sgml | 17 ++++++++++++++++-
src/backend/postmaster/postmaster.c | 17 ++++++++++++++++-
src/backend/tcop/postgres.c | 17 ++++++++++++++++-
src/backend/utils/adt/timestamp.c | 8 +++++++-
src/include/catalog/pg_proc.h | 6 +++++-
src/include/utils/timestamp.h | 6 +++++-
6 files changed, 65 insertions(+), 6 deletions(-)
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 22baa22aa6d..43df7d595c9 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -1,5 +1,5 @@
<!--
-$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.254 2005/06/13 02:40:04 neilc Exp $
+$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.255 2005/06/14 21:04:38 momjian Exp $
PostgreSQL documentation
-->
@@ -8119,6 +8119,12 @@ select current_date + s.a as dates from generate_series(0,14,7) as s(a);
<entry>session user name</entry>
</row>
+ <row>
+ <entry><function>pg_postmaster_start_time()</function></entry>
+ <entry><type>timestamp with time zone</type></entry>
+ <entry><command>postmaster</> start time</entry>
+ </row>
+
<row>
<entry><function>user</function></entry>
<entry><type>name</type></entry>
@@ -8216,6 +8222,15 @@ SET search_path TO <replaceable>schema</> <optional>, <replaceable>schema</>, ..
Unix-domain socket.
</para>
+ <indexterm zone="functions-info">
+ <primary>pg_postmaster_start_time</primary>
+ </indexterm>
+
+ <para>
+ <function>pg_postmaster_start_time()</function> returns the timestamp with time zone
+ when the <command>postmaster</> started.
+ </para>
+
<indexterm zone="functions-info">
<primary>version</primary>
</indexterm>
diff --git a/src/backend/postmaster/postmaster.c b/src/backend/postmaster/postmaster.c
index af28bf652fb..03057dbcb21 100644
--- a/src/backend/postmaster/postmaster.c
+++ b/src/backend/postmaster/postmaster.c
@@ -37,7 +37,7 @@
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.452 2005/06/09 22:01:12 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.453 2005/06/14 21:04:39 momjian Exp $
*
* NOTES
*
@@ -222,6 +222,9 @@ static bool FatalError = false; /* T if recovering from backend crash */
bool ClientAuthInProgress = false; /* T during new-client
* authentication */
+/* Backend startup time */
+TimestampTz StartTime;
+
/*
* State for assigning random salts and cancel keys.
* Also, the global MyCancelKey passes the cancel key assigned to a given
@@ -330,6 +333,7 @@ typedef struct
InheritableSocket pgStatPipe0;
InheritableSocket pgStatPipe1;
pid_t PostmasterPid;
+ TimestampTz StartTime;
#ifdef WIN32
HANDLE PostmasterHandle;
HANDLE initial_signal_pipe;
@@ -372,6 +376,9 @@ PostmasterMain(int argc, char *argv[])
char *userDoption = NULL;
int i;
+ AbsoluteTime StartTimeSec; /* integer part */
+ int StartTimeUSec; /* microsecond part */
+
/* This will call exit() if strdup() fails. */
progname = get_progname(argv[0]);
@@ -914,6 +921,12 @@ PostmasterMain(int argc, char *argv[])
*/
StartupPID = StartupDataBase();
+ /*
+ * Get start up time
+ */
+ StartTimeSec = GetCurrentAbsoluteTimeUsec(&StartTimeUSec);
+ StartTime = AbsoluteTimeUsecToTimestampTz(StartTimeSec, StartTimeUSec);
+
status = ServerLoop();
/*
@@ -3603,6 +3616,7 @@ save_backend_variables(BackendParameters *param, Port *port,
write_inheritable_socket(¶m->pgStatPipe1, pgStatPipe[1], childPid);
param->PostmasterPid = PostmasterPid;
+ param->StartTime = StartTime;
#ifdef WIN32
param->PostmasterHandle = PostmasterHandle;
@@ -3805,6 +3819,7 @@ restore_backend_variables(BackendParameters *param, Port *port)
read_inheritable_socket(&pgStatPipe[1], ¶m->pgStatPipe1);
PostmasterPid = param->PostmasterPid;
+ StartTime = param->StartTime;
#ifdef WIN32
PostmasterHandle = param->PostmasterHandle;
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 58b1ffbce9a..f1c65bacc43 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.447 2005/06/03 23:05:29 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.448 2005/06/14 21:04:40 momjian Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@@ -149,6 +149,9 @@ static int UseNewLine = 0; /* Use EOF as query delimiters */
#endif /* TCOP_DONTUSENEWLINE */
+/* Backend startup time */
+TimestampTz StartTime;
+
/* ----------------------------------------------------------------
* decls for routines only used in this file
* ----------------------------------------------------------------
@@ -2380,6 +2383,9 @@ PostgresMain(int argc, char *argv[], const char *username)
sigjmp_buf local_sigjmp_buf;
volatile bool send_rfq = true;
+ AbsoluteTime StartTimeSec; /* integer part */
+ int StartTimeUSec; /* microsecond part */
+
#define PendingConfigOption(name,val) \
(guc_names = lappend(guc_names, pstrdup(name)), \
guc_values = lappend(guc_values, pstrdup(val)))
@@ -2969,6 +2975,15 @@ PostgresMain(int argc, char *argv[], const char *username)
*/
pgstat_bestart();
+ /*
+ * Get stand-alone backend startup time
+ */
+ if (!IsUnderPostmaster)
+ {
+ StartTimeSec = GetCurrentAbsoluteTimeUsec(&StartTimeUSec);
+ StartTime = AbsoluteTimeUsecToTimestampTz(StartTimeSec, StartTimeUSec);
+ }
+
/*
* POSTGRES main processing loop begins here
*
diff --git a/src/backend/utils/adt/timestamp.c b/src/backend/utils/adt/timestamp.c
index 27e0523f49c..37308d7451a 100644
--- a/src/backend/utils/adt/timestamp.c
+++ b/src/backend/utils/adt/timestamp.c
@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.124 2005/05/26 02:04:13 neilc Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.125 2005/06/14 21:04:40 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -938,6 +938,12 @@ now(PG_FUNCTION_ARGS)
PG_RETURN_TIMESTAMPTZ(result);
}
+Datum
+pgsql_postmaster_start_time(PG_FUNCTION_ARGS)
+{
+ PG_RETURN_TIMESTAMPTZ(StartTime);
+}
+
void
dt2time(Timestamp jd, int *hour, int *min, int *sec, fsec_t *fsec)
{
diff --git a/src/include/catalog/pg_proc.h b/src/include/catalog/pg_proc.h
index bc5d8afefaf..c06c4a7d41f 100644
--- a/src/include/catalog/pg_proc.h
+++ b/src/include/catalog/pg_proc.h
@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.366 2005/06/13 02:26:50 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.367 2005/06/14 21:04:41 momjian Exp $
*
* NOTES
* The script catalog/genbki.sh reads this file and generates .bki
@@ -3651,6 +3651,10 @@ DESCR("convert boolean to int4");
DATA(insert OID = 2559 ( lastval PGNSP PGUID 12 f f t f v 0 20 "" _null_ _null_ _null_ lastval - _null_ ));
DESCR("current value from last used sequence");
+/* start time function */
+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_ ));
+DESCR("postmaster start time");
+
/*
* Symbolic values for provolatile column: these indicate whether the result
diff --git a/src/include/utils/timestamp.h b/src/include/utils/timestamp.h
index cfd5e1458c5..782b75ec8df 100644
--- a/src/include/utils/timestamp.h
+++ b/src/include/utils/timestamp.h
@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.43 2005/05/25 21:40:42 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.44 2005/06/14 21:04:42 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -256,6 +256,10 @@ extern Datum timestamptz_part(PG_FUNCTION_ARGS);
extern Datum now(PG_FUNCTION_ARGS);
+extern Datum pgsql_postmaster_start_time(PG_FUNCTION_ARGS);
+
+extern TimestampTz StartTime;
+
/* Internal routines (not fmgr-callable) */
extern int tm2timestamp(struct pg_tm * tm, fsec_t fsec, int *tzp, Timestamp *dt);
--
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