diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 0a1f3fa70d0bc23660c5746d6a72ec80d6be1c01..e0d0bbfaac0f7224a155a8e389b3192118e5b172 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -1,5 +1,5 @@
 # -*-makefile-*-
-# $PostgreSQL: pgsql/src/Makefile.global.in,v 1.174 2004/02/02 00:11:30 momjian Exp $
+# $PostgreSQL: pgsql/src/Makefile.global.in,v 1.175 2004/02/10 03:42:42 tgl Exp $
 
 #------------------------------------------------------------------------------
 # All PostgreSQL makefiles include this file and use the variables it sets,
@@ -339,7 +339,7 @@ endif
 #
 # substitute implementations of the C library
 
-LIBOBJS = @LIBOBJS@ path.o sprompt.o thread.o
+LIBOBJS = @LIBOBJS@ path.o pgsleep.o sprompt.o thread.o
 
 ifneq (,$(LIBOBJS))
 LIBS += -lpgport
diff --git a/src/backend/access/gist/gist.c b/src/backend/access/gist/gist.c
index 65a10490d1e763fcced351e57fc6f3fdea3f3ebf..b117b33f72de197c327271e6dd0db435b9f5511c 100644
--- a/src/backend/access/gist/gist.c
+++ b/src/backend/access/gist/gist.c
@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/gist/gist.c,v 1.107 2004/01/07 18:56:23 neilc Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/gist/gist.c,v 1.108 2004/02/10 03:42:42 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -19,6 +19,7 @@
 #include "access/gistscan.h"
 #include "access/heapam.h"
 #include "catalog/index.h"
+#include "commands/vacuum.h"
 #include "miscadmin.h"
 
 
@@ -1614,6 +1615,8 @@ gistbulkdelete(PG_FUNCTION_ARGS)
 
 	while (index_getnext_indexitem(iscan, ForwardScanDirection))
 	{
+		vacuum_delay_point();
+
 		if (callback(&iscan->xs_ctup.t_self, callback_state))
 		{
 			ItemPointerData indextup = iscan->currentItemData;
diff --git a/src/backend/access/hash/hash.c b/src/backend/access/hash/hash.c
index 5ada6b34d87b6f8e2ca27d4a332d7e4f6d0d0d47..c1c3cde6fc0b91d060fc9e3d4dd8786f10bd4888 100644
--- a/src/backend/access/hash/hash.c
+++ b/src/backend/access/hash/hash.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.70 2004/01/07 18:56:23 neilc Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.71 2004/02/10 03:42:43 tgl Exp $
  *
  * NOTES
  *	  This file contains only the public interface routines.
@@ -23,6 +23,7 @@
 #include "access/heapam.h"
 #include "access/xlogutils.h"
 #include "catalog/index.h"
+#include "commands/vacuum.h"
 #include "executor/executor.h"
 #include "miscadmin.h"
 
@@ -514,6 +515,8 @@ loop_top:
 			OffsetNumber maxoffno;
 			bool		page_dirty = false;
 
+			vacuum_delay_point();
+
 			buf = _hash_getbuf(rel, blkno, HASH_WRITE);
 			page = BufferGetPage(buf);
 			_hash_checkpage(rel, page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
diff --git a/src/backend/access/nbtree/nbtree.c b/src/backend/access/nbtree/nbtree.c
index fa77318ea3fbf97dd1806d5cbfc0232617552e79..79a69a7043f913a4651d21ab628c0a1c1c373c5c 100644
--- a/src/backend/access/nbtree/nbtree.c
+++ b/src/backend/access/nbtree/nbtree.c
@@ -12,7 +12,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtree.c,v 1.112 2004/02/10 01:55:24 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtree.c,v 1.113 2004/02/10 03:42:43 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -22,6 +22,7 @@
 #include "access/heapam.h"
 #include "access/nbtree.h"
 #include "catalog/index.h"
+#include "commands/vacuum.h"
 #include "miscadmin.h"
 #include "storage/freespace.h"
 #include "storage/smgr.h"
@@ -584,27 +585,7 @@ btbulkdelete(PG_FUNCTION_ARGS)
 						maxoff;
 			BlockNumber nextpage;
 
-			CHECK_FOR_INTERRUPTS();
-
-			/*
-			 * If we're called by a cost based vacuum, do the
-			 * napping in case the balance exceeded the limit.
-			 */
-			if (VacuumCostActive && !InterruptPending &&
-					VacuumCostBalance >= VacuumCostLimit)
-			{
-				int		msec;
-
-				msec = VacuumCostNaptime * VacuumCostBalance / VacuumCostLimit;
-				if (msec < VacuumCostNaptime * 4)
-					PG_MSLEEP(msec);
-				else
-					PG_MSLEEP(VacuumCostNaptime * 4);
-
-				VacuumCostBalance = 0;
-
-				CHECK_FOR_INTERRUPTS();
-			}
+			vacuum_delay_point();
 
 			ndeletable = 0;
 			page = BufferGetPage(buf);
diff --git a/src/backend/access/rtree/rtree.c b/src/backend/access/rtree/rtree.c
index 9414e3142898cbf7c8047908b446a1e49aafad45..f713a5e7f6b60d09dbacbf904e2e5207ed769794 100644
--- a/src/backend/access/rtree/rtree.c
+++ b/src/backend/access/rtree/rtree.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/rtree/rtree.c,v 1.82 2004/01/07 18:56:24 neilc Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/rtree/rtree.c,v 1.83 2004/02/10 03:42:43 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -20,6 +20,7 @@
 #include "access/rtree.h"
 #include "access/xlogutils.h"
 #include "catalog/index.h"
+#include "commands/vacuum.h"
 #include "executor/executor.h"
 #include "miscadmin.h"
 
@@ -1219,6 +1220,8 @@ rtbulkdelete(PG_FUNCTION_ARGS)
 
 	while (index_getnext_indexitem(iscan, ForwardScanDirection))
 	{
+		vacuum_delay_point();
+
 		if (callback(&iscan->xs_ctup.t_self, callback_state))
 		{
 			ItemPointerData indextup = iscan->currentItemData;
diff --git a/src/backend/access/transam/xact.c b/src/backend/access/transam/xact.c
index 06e152d1bba55263a3385a338b3207deafe02014..5aeb70f2986d424940dad9c245368a09c680069c 100644
--- a/src/backend/access/transam/xact.c
+++ b/src/backend/access/transam/xact.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.162 2004/02/10 01:55:24 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.163 2004/02/10 03:42:43 tgl Exp $
  *
  * NOTES
  *		Transaction aborts can now occur two ways:
@@ -142,7 +142,6 @@
 #include "postgres.h"
 
 #include <unistd.h>
-#include <sys/time.h>
 
 #include "access/gistscan.h"
 #include "access/hash.h"
@@ -562,7 +561,7 @@ RecordTransactionCommit(void)
 			 */
 			if (CommitDelay > 0 && enableFsync &&
 				CountActiveBackends() >= CommitSiblings)
-				PG_USLEEP(CommitDelay);
+				pg_usleep(CommitDelay);
 
 			XLogFlush(recptr);
 		}
diff --git a/src/backend/commands/analyze.c b/src/backend/commands/analyze.c
index 09269d9187c3922bd9ec0d6a112cbdedd1262ed7..0c713b3ca678cfba5877470d4731c999bf4cb0f2 100644
--- a/src/backend/commands/analyze.c
+++ b/src/backend/commands/analyze.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/analyze.c,v 1.66 2004/01/06 18:07:31 neilc Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/analyze.c,v 1.67 2004/02/10 03:42:43 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -529,7 +529,7 @@ acquire_sample_rows(Relation onerel, HeapTuple *rows, int targrows,
 		rows[numrows++] = heap_copytuple(tuple);
 		if (numrows >= targrows)
 			break;
-		CHECK_FOR_INTERRUPTS();
+		vacuum_delay_point();
 	}
 	heap_endscan(scan);
 
@@ -604,7 +604,7 @@ acquire_sample_rows(Relation onerel, HeapTuple *rows, int targrows,
 		OffsetNumber targoffset,
 					maxoffset;
 
-		CHECK_FOR_INTERRUPTS();
+		vacuum_delay_point();
 
 		t = select_next_random_record(t, targrows, &rstate);
 		/* Try to read the t'th record in the table */
@@ -912,7 +912,7 @@ compute_minimal_stats(VacAttrStats *stats,
 		int			firstcount1,
 					j;
 
-		CHECK_FOR_INTERRUPTS();
+		vacuum_delay_point();
 
 		value = heap_getattr(tuple, stats->attnum, tupDesc, &isnull);
 
@@ -1214,7 +1214,7 @@ compute_scalar_stats(VacAttrStats *stats,
 		Datum		value;
 		bool		isnull;
 
-		CHECK_FOR_INTERRUPTS();
+		vacuum_delay_point();
 
 		value = heap_getattr(tuple, stats->attnum, tupDesc, &isnull);
 
diff --git a/src/backend/commands/vacuum.c b/src/backend/commands/vacuum.c
index 29a2df1ef1d4aee68a01632f9f402d72672d2546..a0dd09df215e835c636ab1d4847ba963c2589169 100644
--- a/src/backend/commands/vacuum.c
+++ b/src/backend/commands/vacuum.c
@@ -13,7 +13,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.272 2004/02/10 01:55:25 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.273 2004/02/10 03:42:43 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -181,6 +181,10 @@ vacuum(VacuumStmt *vacstmt)
 	if (vacstmt->vacuum)
 		PreventTransactionChain((void *) vacstmt, stmttype);
 
+	/* Turn vacuum cost accounting on or off */
+	VacuumCostActive = (VacuumCostNaptime > 0);
+	VacuumCostBalance = 0;
+
 	/*
 	 * Send info about dead objects to the statistics collector
 	 */
@@ -374,6 +378,9 @@ vacuum(VacuumStmt *vacstmt)
 
 	if (anl_context)
 		MemoryContextDelete(anl_context);
+
+	/* Turn off vacuum cost accounting */
+	VacuumCostActive = false;
 }
 
 /*
@@ -1082,7 +1089,7 @@ scan_heap(VRelStats *vacrelstats, Relation onerel,
 		bool		do_reap,
 					do_frag;
 
-		CHECK_FOR_INTERRUPTS();
+		vacuum_delay_point();
 
 		buf = ReadBuffer(onerel, blkno);
 		page = BufferGetPage(buf);
@@ -1528,7 +1535,7 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
 		 blkno > last_move_dest_block;
 		 blkno--)
 	{
-		CHECK_FOR_INTERRUPTS();
+		vacuum_delay_point();
 
 		/*
 		 * Forget fraged_pages pages at or after this one; they're no
@@ -2311,7 +2318,8 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
 		 i < vacuumed_pages;
 		 i++, curpage++)
 	{
-		CHECK_FOR_INTERRUPTS();
+		vacuum_delay_point();
+
 		Assert((*curpage)->blkno < blkno);
 		if ((*curpage)->offsets_used == 0)
 		{
@@ -2342,7 +2350,8 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
 		 i < num_fraged_pages;
 		 i++, curpage++)
 	{
-		CHECK_FOR_INTERRUPTS();
+		vacuum_delay_point();
+
 		Assert((*curpage)->blkno < blkno);
 		if ((*curpage)->blkno > last_move_dest_block)
 			break;				/* no need to scan any further */
@@ -2553,7 +2562,8 @@ vacuum_heap(VRelStats *vacrelstats, Relation onerel, VacPageList vacuum_pages)
 
 	for (i = 0, vacpage = vacuum_pages->pagedesc; i < nblocks; i++, vacpage++)
 	{
-		CHECK_FOR_INTERRUPTS();
+		vacuum_delay_point();
+
 		if ((*vacpage)->offsets_free > 0)
 		{
 			buf = ReadBuffer(onerel, (*vacpage)->blkno);
@@ -3164,3 +3174,34 @@ vac_show_rusage(VacRUsage *ru0)
 
 	return result;
 }
+
+/*
+ * vacuum_delay_point --- check for interrupts and cost-based delay.
+ *
+ * This should be called in each major loop of VACUUM processing,
+ * typically once per page processed.
+ */
+void
+vacuum_delay_point(void)
+{
+	/* Always check for interrupts */
+	CHECK_FOR_INTERRUPTS();
+
+	/* Nap if appropriate */
+	if (VacuumCostActive && !InterruptPending &&
+		VacuumCostBalance >= VacuumCostLimit)
+	{
+		int		msec;
+
+		msec = VacuumCostNaptime * VacuumCostBalance / VacuumCostLimit;
+		if (msec > VacuumCostNaptime * 4)
+			msec = VacuumCostNaptime * 4;
+
+		pg_usleep(msec * 1000L);
+
+		VacuumCostBalance = 0;
+
+		/* Might have gotten an interrupt while sleeping */
+		CHECK_FOR_INTERRUPTS();
+	}
+}
diff --git a/src/backend/commands/vacuumlazy.c b/src/backend/commands/vacuumlazy.c
index 17f91efef7065130b6cf8f573505bf695ea579a3..2d85b65293763e1d9827910d3a5f427ca073b322 100644
--- a/src/backend/commands/vacuumlazy.c
+++ b/src/backend/commands/vacuumlazy.c
@@ -31,7 +31,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.36 2004/02/10 01:55:25 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.37 2004/02/10 03:42:44 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -148,10 +148,6 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt)
 	vac_open_indexes(onerel, &nindexes, &Irel);
 	hasindex = (nindexes > 0);
 
-	/* Turn vacuum cost accounting on or off */
-	VacuumCostActive = (VacuumCostNaptime > 0);
-	VacuumCostBalance = 0;
-
 	/* Do the vacuuming */
 	lazy_scan_heap(onerel, vacrelstats, Irel, nindexes);
 
@@ -172,9 +168,6 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt)
 	/* Update shared free space map with final free space info */
 	lazy_update_fsm(onerel, vacrelstats);
 
-	/* Turn off vacuum cost accounting */
-	VacuumCostActive = false;
-
 	/* Update statistics in pg_class */
 	vac_update_relstats(RelationGetRelid(onerel), vacrelstats->rel_pages,
 						vacrelstats->rel_tuples, hasindex);
@@ -233,26 +226,7 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
 					hastup;
 		int			prev_dead_count;
 
-		CHECK_FOR_INTERRUPTS();
-
-		/*
-		 * Do the napping in a cost based vacuum.
-		 */
-		if (VacuumCostActive && !InterruptPending &&
-				VacuumCostBalance >= VacuumCostLimit)
-		{
-			int		msec;
-
-			msec = VacuumCostNaptime * VacuumCostBalance / VacuumCostLimit;
-			if (msec < VacuumCostNaptime * 4)
-				PG_MSLEEP(msec);
-			else
-				PG_MSLEEP(VacuumCostNaptime * 4);
-
-			VacuumCostBalance = 0;
-
-			CHECK_FOR_INTERRUPTS();
-		}
+		vacuum_delay_point();
 
 		/*
 		 * If we are close to overrunning the available space for
@@ -493,26 +467,7 @@ lazy_vacuum_heap(Relation onerel, LVRelStats *vacrelstats)
 		Buffer		buf;
 		Page		page;
 
-		CHECK_FOR_INTERRUPTS();
-
-		/*
-		 * Do the napping in a cost based vacuum.
-		 */
-		if (VacuumCostActive && !InterruptPending &&
-				VacuumCostBalance >= VacuumCostLimit)
-		{
-			int		msec;
-
-			msec = VacuumCostNaptime * VacuumCostBalance / VacuumCostLimit;
-			if (msec < VacuumCostNaptime * 4)
-				PG_MSLEEP(msec);
-			else
-				PG_MSLEEP(VacuumCostNaptime * 4);
-
-			VacuumCostBalance = 0;
-
-			CHECK_FOR_INTERRUPTS();
-		}
+		vacuum_delay_point();
 
 		tblk = ItemPointerGetBlockNumber(&vacrelstats->dead_tuples[tupindex]);
 		buf = ReadBuffer(onerel, tblk);
@@ -845,26 +800,7 @@ count_nondeletable_pages(Relation onerel, LVRelStats *vacrelstats)
 					tupgone,
 					hastup;
 
-		CHECK_FOR_INTERRUPTS();
-
-		/*
-		 * Do the napping in a cost based vacuum.
-		 */
-		if (VacuumCostActive && !InterruptPending &&
-				VacuumCostBalance >= VacuumCostLimit)
-		{
-			int		msec;
-
-			msec = VacuumCostNaptime * VacuumCostBalance / VacuumCostLimit;
-			if (msec < VacuumCostNaptime * 4)
-				PG_MSLEEP(msec);
-			else
-				PG_MSLEEP(VacuumCostNaptime * 4);
-
-			VacuumCostBalance = 0;
-
-			CHECK_FOR_INTERRUPTS();
-		}
+		vacuum_delay_point();
 
 		blkno--;
 
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 203e03ab059b094aca730f3df3fa0d2c569c7952..0ad26ee4f0be2aeae73400caf908236dbde2a4de 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.157 2004/02/10 01:55:25 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.158 2004/02/10 03:42:45 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -44,7 +44,6 @@
 #include <math.h>
 #include <signal.h>
 #include <sys/file.h>
-#include <sys/time.h>
 #include <unistd.h>
 
 #include "lib/stringinfo.h"
@@ -972,7 +971,7 @@ BufferBackgroundWriter(void)
 		 * Nap for the configured time or sleep for 10 seconds if
 		 * there was nothing to do at all.
 		 */
-		PG_USLEEP((n > 0) ? BgWriterDelay * 1000 : 10000000);
+		pg_usleep((n > 0) ? BgWriterDelay * 1000L : 10000000L);
 	}
 }
 
diff --git a/src/backend/storage/lmgr/s_lock.c b/src/backend/storage/lmgr/s_lock.c
index 85d1a16516ac9c38635b27617ca5a8ea2f555100..dcbf210519b8a7fe76065bab8255b335a95a446e 100644
--- a/src/backend/storage/lmgr/s_lock.c
+++ b/src/backend/storage/lmgr/s_lock.c
@@ -9,13 +9,12 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/storage/lmgr/s_lock.c,v 1.24 2004/01/09 21:08:49 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/storage/lmgr/s_lock.c,v 1.25 2004/02/10 03:42:45 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
 #include "postgres.h"
 
-#include <sys/time.h>
 #include <unistd.h>
 
 #include "storage/s_lock.h"
@@ -96,7 +95,7 @@ s_lock(volatile slock_t *lock, const char *file, int line)
 			if (++delays > NUM_DELAYS)
 				s_lock_stuck(lock, file, line);
 
-			PG_USLEEP(cur_delay * 10000);
+			pg_usleep(cur_delay * 10000L);
 
 #if defined(S_LOCK_TEST)
 			fprintf(stdout, "*");
diff --git a/src/backend/utils/init/globals.c b/src/backend/utils/init/globals.c
index f916d013d1c129a0812bf0924395bcef96fd1a88..8bcf48b2f2780e95d966012e78b7742fd87cfd8a 100644
--- a/src/backend/utils/init/globals.c
+++ b/src/backend/utils/init/globals.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/init/globals.c,v 1.83 2004/02/06 19:36:18 wieck Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/init/globals.c,v 1.84 2004/02/10 03:42:45 tgl Exp $
  *
  * NOTES
  *	  Globals used all over the place should be declared here and not
@@ -82,10 +82,11 @@ int			work_mem = 1024;
 int			maintenance_work_mem = 16384;
 int			NBuffers = 1000;
 
-int			VacuumCostPageHit = 1;
+int			VacuumCostPageHit = 1;			/* GUC parameters for vacuum */
 int			VacuumCostPageMiss = 10;
 int			VacuumCostPageDirty = 20;
 int			VacuumCostLimit = 200;
-int			VacuumCostBalance = 0;
 int			VacuumCostNaptime = 0;
+
+int			VacuumCostBalance = 0;			/* working state for vacuum */
 bool		VacuumCostActive = false;
diff --git a/src/include/commands/vacuum.h b/src/include/commands/vacuum.h
index e93942fd2565d79d2a262aaa4a7f661c4b321a63..61985b0d395b53078b73aef5f5762d3ec5f77033 100644
--- a/src/include/commands/vacuum.h
+++ b/src/include/commands/vacuum.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/commands/vacuum.h,v 1.47 2003/11/29 22:40:59 pgsql Exp $
+ * $PostgreSQL: pgsql/src/include/commands/vacuum.h,v 1.48 2004/02/10 03:42:45 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -53,6 +53,7 @@ extern void vacuum_set_xid_limits(VacuumStmt *vacstmt, bool sharedRel,
 extern bool vac_is_partial_index(Relation indrel);
 extern void vac_init_rusage(VacRUsage *ru0);
 extern const char *vac_show_rusage(VacRUsage *ru0);
+extern void vacuum_delay_point(void);
 
 /* in commands/vacuumlazy.c */
 extern void lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt);
diff --git a/src/include/miscadmin.h b/src/include/miscadmin.h
index 7e9a209331ecfe45689973e61b4a237e3b9dd3f0..b43d481c52aa372b739de3c1f466fda063090003 100644
--- a/src/include/miscadmin.h
+++ b/src/include/miscadmin.h
@@ -12,7 +12,7 @@
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/miscadmin.h,v 1.152 2004/02/08 22:28:57 neilc Exp $
+ * $PostgreSQL: pgsql/src/include/miscadmin.h,v 1.153 2004/02/10 03:42:45 tgl Exp $
  *
  * NOTES
  *	  some of the information in this file should be moved to
@@ -24,7 +24,6 @@
 #define MISCADMIN_H
 
 
-
 /*****************************************************************************
  *	  System interrupt and critical section handling
  *
@@ -83,10 +82,10 @@ do { \
 #else
 #define CHECK_FOR_INTERRUPTS() \
 do { \
-	WaitForSingleObjectEx(GetCurrentThread(),0,TRUE);	\
+	WaitForSingleObjectEx(GetCurrentThread(),0,TRUE); \
 	if (InterruptPending) \
 		ProcessInterrupts(); \
-} while (0)
+} while(0)
 #endif
 
 
@@ -106,34 +105,6 @@ do { \
 	CritSectionCount--; \
 } while(0)
 
-#ifndef WIN32
-#define PG_USLEEP(_usec) \
-do { \
-	/* This will overflow on systems with 32-bit ints for > ~2000 secs */ \
-	struct timeval delay; \
-	\
-	delay.tv_sec = (_usec) / 1000000; \
-	delay.tv_usec = ((_usec) % 1000000); \
-	(void) select(0, NULL, NULL, NULL, &delay); \
-} while(0)
-#define PG_MSLEEP(_msec) \
-do { \
-	struct timeval _delay; \
-	_delay.tv_sec = (_msec) / 1000; \
-	_delay.tv_usec = ((_msec) % 1000) * 1000; \
-	(void) select (0, NULL, NULL, NULL, &_delay); \
-} while(0)
-#else
-#define PG_USLEEP(_usec) \
-do { \
-	SleepEx(((_usec) < 500 ? 1 : ((_usec) + 500) / 1000), TRUE); \
-} while(0)
-#define PG_MSLEEP(_msec) PG_USLEEP((_msec) * 1000)
-#endif
-
-#ifdef WIN32
-#define ftruncate(a,b)	chsize(a,b)
-#endif
 
 /*****************************************************************************
  *	  globals.h --															 *
@@ -227,14 +198,14 @@ extern bool enableFsync;
 extern bool allowSystemTableMods;
 extern DLLIMPORT int work_mem;
 extern DLLIMPORT int maintenance_work_mem;
-extern int	VacuumMem;
 
 extern int	VacuumCostPageHit;
 extern int	VacuumCostPageMiss;
 extern int	VacuumCostPageDirty;
 extern int	VacuumCostLimit;
-extern int	VacuumCostBalance;
 extern int	VacuumCostNaptime;
+
+extern int	VacuumCostBalance;
 extern bool	VacuumCostActive;
 
 /*
diff --git a/src/include/port.h b/src/include/port.h
index a885e91424de546bfbf5d470d569c0c01e6506ef..40ccc8a6d22e48a1e7722847799c0a0418e5c31a 100644
--- a/src/include/port.h
+++ b/src/include/port.h
@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/port.h,v 1.18 2004/02/02 22:20:33 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/port.h,v 1.19 2004/02/10 03:42:45 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -23,6 +23,10 @@ extern char *first_path_separator(const char *filename);
 extern char *last_path_separator(const char *filename);
 extern char *get_progname(char *argv0);
 
+/* Portable delay handling */
+extern void pg_usleep(long microsec);
+
+/* Portable prompt handling */
 extern char *simple_prompt(const char *prompt, int maxlen, bool echo);
 
 #if defined(bsdi) || defined(netbsd)
@@ -138,6 +142,7 @@ extern int pqGethostbyname(const char *name,
 #ifdef WIN32
 #define fsync(a)	_commit(a)
 #define sync()		_flushall()
+#define ftruncate(a,b)	chsize(a,b)
 #define WEXITSTATUS(w)  (((w) >> 8) & 0xff)
 #define WIFEXITED(w)    (((w) & 0xff) == 0)
 #define WIFSIGNALED(w)  (((w) & 0x7f) > 0 && (((w) & 0x7f) < 0x7f))
diff --git a/src/port/pgsleep.c b/src/port/pgsleep.c
new file mode 100644
index 0000000000000000000000000000000000000000..52ea860e75251c49648147e14cb3bb687ff3f303
--- /dev/null
+++ b/src/port/pgsleep.c
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * pgsleep.c
+ *	   Portable delay handling.
+ *
+ *
+ * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
+ *
+ * $PostgreSQL: pgsql/src/port/pgsleep.c,v 1.1 2004/02/10 03:42:45 tgl Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include <sys/time.h>
+
+
+/*
+ * pg_usleep --- delay the specified number of microseconds.
+ *
+ * NOTE: although the delay is specified in microseconds, the effective
+ * resolution is only 1/HZ, or 10 milliseconds, on most Unixen.  Expect
+ * the requested delay to be rounded up to the next resolution boundary.
+ *
+ * On machines where "long" is 32 bits, the maximum delay is ~2000 seconds.
+ */
+void
+pg_usleep(long microsec)
+{
+	if (microsec > 0)
+	{
+#ifndef WIN32
+		struct timeval delay;
+
+		delay.tv_sec = microsec / 1000000L;
+		delay.tv_usec = microsec % 1000000L;
+		(void) select(0, NULL, NULL, NULL, &delay);
+#else
+		SleepEx((microsec < 500 ? 1 : (microsec + 500) / 1000), TRUE);
+#endif
+	}
+}