Replace time_t with pg_time_t (same values, but always int64) in on-disk

data structures and backend internal APIs.  This solves problems we've seen
recently with inconsistent layout of pg_control between machines that have
32-bit time_t and those that have already migrated to 64-bit time_t.  Also,
we can get out from under the problem that Windows' Unix-API emulation is not
consistent about the width of time_t.

There are a few remaining places where local time_t variables are used to hold
the current or recent result of time(NULL).  I didn't bother changing these
since they do not affect any cross-module APIs and surely all platforms will
have 64-bit time_t before overflow becomes an actual risk.  time_t should
be avoided for anything visible to extension modules, however.

2 files changed, 13 insertions, 13 deletions

diff --git a/src/backend/postmaster/bgwriter.c b/src/backend/postmaster/bgwriter.c
index 10586b8fad2..5dce3fa6989 100644
--- a/src/backend/postmaster/bgwriter.c
+++ b/src/backend/postmaster/bgwriter.c
@@ -37,7 +37,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/postmaster/bgwriter.c,v 1.48 2008/01/01 19:45:51 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/postmaster/bgwriter.c,v 1.49 2008/02/17 02:09:27 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -163,12 +163,12 @@ static bool am_bg_writer = false;
 static bool ckpt_active = false;
 
 /* these values are valid when ckpt_active is true: */
-static time_t ckpt_start_time;
+static pg_time_t ckpt_start_time;
 static XLogRecPtr ckpt_start_recptr;
 static double ckpt_cached_elapsed;
 
-static time_t last_checkpoint_time;
-static time_t last_xlog_switch_time;
+static pg_time_t last_checkpoint_time;
+static pg_time_t last_xlog_switch_time;
 
 /* Prototypes for private functions */
 
@@ -250,7 +250,7 @@ BackgroundWriterMain(void)
 	/*
 	 * Initialize so that first time-driven event happens at the correct time.
 	 */
-	last_checkpoint_time = last_xlog_switch_time = time(NULL);
+	last_checkpoint_time = last_xlog_switch_time = (pg_time_t) time(NULL);
 
 	/*
 	 * Create a resource owner to keep track of our resources (currently only
@@ -361,7 +361,7 @@ BackgroundWriterMain(void)
 	{
 		bool		do_checkpoint = false;
 		int			flags = 0;
-		time_t		now;
+		pg_time_t	now;
 		int			elapsed_secs;
 
 		/*
@@ -407,7 +407,7 @@ BackgroundWriterMain(void)
 		 * occurs without an external request, but we set the CAUSE_TIME flag
 		 * bit even if there is also an external request.
 		 */
-		now = time(NULL);
+		now = (pg_time_t) time(NULL);
 		elapsed_secs = now - last_checkpoint_time;
 		if (elapsed_secs >= CheckPointTimeout)
 		{
@@ -504,13 +504,13 @@ BackgroundWriterMain(void)
 static void
 CheckArchiveTimeout(void)
 {
-	time_t		now;
-	time_t		last_time;
+	pg_time_t	now;
+	pg_time_t	last_time;
 
 	if (XLogArchiveTimeout <= 0)
 		return;
 
-	now = time(NULL);
+	now = (pg_time_t) time(NULL);
 
 	/* First we do a quick check using possibly-stale local state. */
 	if ((int) (now - last_xlog_switch_time) < XLogArchiveTimeout)
@@ -730,7 +730,7 @@ IsCheckpointOnSchedule(double progress)
 	 * Check progress against time elapsed and checkpoint_timeout.
 	 */
 	gettimeofday(&now, NULL);
-	elapsed_time = ((double) (now.tv_sec - ckpt_start_time) +
+	elapsed_time = ((double) ((pg_time_t) now.tv_sec - ckpt_start_time) +
 					now.tv_usec / 1000000.0) / CheckPointTimeout;
 
 	if (progress < elapsed_time)
diff --git a/src/backend/postmaster/syslogger.c b/src/backend/postmaster/syslogger.c
index aa5d34ef5b2..91bf56225a1 100644
--- a/src/backend/postmaster/syslogger.c
+++ b/src/backend/postmaster/syslogger.c
@@ -18,7 +18,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/postmaster/syslogger.c,v 1.44 2008/01/25 20:42:10 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/postmaster/syslogger.c,v 1.45 2008/02/17 02:09:27 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -331,7 +331,7 @@ SysLoggerMain(int argc, char *argv[])
 		if (!rotation_requested && Log_RotationAge > 0)
 		{
 			/* Do a logfile rotation if it's time */
-			pg_time_t	now = time(NULL);
+			pg_time_t	now = (pg_time_t) time(NULL);
 
 			if (now >= next_rotation_time)
 				rotation_requested = time_based_rotation = true;