Update. cvs/libc-ud-971111

1997-11-11 21:30  Ulrich Drepper  <drepper@cygnus.com>

	* include/sys/stat.h: Define stat, fstat, lstat and *64 variants
	as macros so the the library compiles correctly even without
	optimization.
	* io/fstat.c: Undef fstat.
	* io/fstat64.c: Undef fstat64
	* io/lstat.c: Undef lstat.
	* io/lstat64.c: Undef lstat64
	* io/stat.c: Undef stat.
	* io/stat64.c: Undef stat64
	* io/fts.c: Include <include/sys/stat.h> to get macro definitions.
	* io/ftw.c: Likewise.
	* io/getdirname.c: Likewise.

	* Makefile (install): Run test-installation.pl if possible.

	* db2/Makefile: Update from db-2.3.12.
	* db2/db.h: Likewise.
	* db2/db_int.h: Likewise.
	* db2/btree/bt_cursor.c: Likewise.
	* db2/btree/bt_delete.c: Likewise.
	* db2/btree/bt_open.c: Likewise.
	* db2/btree/bt_put.c: Likewise.
	* db2/btree/bt_rec.c: Likewise.
	* db2/btree/bt_recno.c: Likewise.
	* db2/btree/bt_search.c: Likewise.
	* db2/btree/bt_split.c: Likewise.
	* db2/btree/bt_stat.c: Likewise.
	* db2/btree/btree.src: Likewise.
	* db2/btree/btree_auto.c: Likewise.
	* db2/btree/bt_cursor.c: Likewise.
	* db2/btree/bt_delete.c: Likewise.
	* db2/btree/bt_open.c: Likewise.
	* db2/btree/bt_put.c: Likewise.
	* db2/btree/bt_rec.c: Likewise.
	* db2/btree/bt_recno.c: Likewise.
	* db2/btree/bt_search.c: Likewise.
	* db2/btree/bt_split.c: Likewise.
	* db2/btree/bt_stat.c: Likewise.
	* db2/btree/btree.src: Likewise.
	* db2/btree/btree_auto.c: Likewise.
	* db2/common/db_appinit.c: Likewise.
	* db2/common/db_apprec.c: Likewise.
	* db2/common/db_byteorder.c: Likewise.
	* db2/common/db_region.c: Likewise.
	* db2/db/db.c: Likewise
	* db2/db/db.src: Likewise
	* db2/db/db_auto.c: Likewise
	* db2/db/db_dispatch.c: Likewise
	* db2/db/db_dup.c: Likewise
	* db2/db/db_overflow.c: Likewise
	* db2/db/db_pr.c: Likewise
	* db2/db/db_rec.c: Likewise
	* db2/db/db_ret.c: Likewise
	* db2/db/db_thread.c: Likewise
	* db2/db185/db185.c: Likewise.
	* db2/hash/hash.c: Likewise.
	* db2/hash/hash.src: Likewise.
	* db2/hash/hash_auto.c: Likewise.
	* db2/hash/hash_dup.c: Likewise.
	* db2/hash/hash_page.c: Likewise.
	* db2/hash/hash_rec.c: Likewise.
	* db2/include/btree_auto.h: Likewise.
	* db2/include/btree_ext.h: Likewise.
	* db2/include/clib_ext.h: Likewise.
	* db2/include/common_ext.h: Likewise.
	* db2/include/db.h.src: Likewise.
	* db2/include/db_am.h: Likewise.
	* db2/include/db_auto.h: Likewise.
	* db2/include/db_cxx.h: Likewise.
	* db2/include/db_ext.h: Likewise.
	* db2/include/db_int.h.src: Likewise.
	* db2/include/hash.h: Likewise.
	* db2/include/hash_auto.h: Likewise.
	* db2/include/hash_ext.h: Likewise.
	* db2/include/lock.h: Likewise.
	* db2/include/lock_ext.h: Likewise.
	* db2/include/log.h: Likewise.
	* db2/include/log_ext.h: Likewise.
	* db2/include/mp.h: Likewise.
	* db2/include/mp_ext.h: Likewise.
	* db2/include/mutex_ext.h: Likewise.
	* db2/include/os_ext.h: Likewise.
	* db2/include/os_func.h: Likewise.
	* db2/include/txn.h: Likewise.
	* db2/include/txn_ext.h: Likewise.
	* db2/lock/lock.c: Likewise.
	* db2/lock/lock_deadlock.c: Likewise.
	* db2/log/log.c: Likewise.
	* db2/log/log_archive.c: Likewise.
	* db2/log/log_auto.c: Likewise.
	* db2/log/log_findckp.c: Likewise.
	* db2/log/log_get.c: Likewise.
	* db2/log/log_put.c: Likewise.
	* db2/log/log_rec.c: Likewise.
	* db2/log/log_register.c: Likewise.
	* db2/mp/mp_bh.c: Likewise.
	* db2/mp/mp_fget.c: Likewise.
	* db2/mp/mp_fopen.c: Likewise.
	* db2/mp/mp_fput.c: Likewise.
	* db2/mp/mp_fset.c: Likewise.
	* db2/mp/mp_open.c: Likewise.
	* db2/mp/mp_pr.c: Likewise.
	* db2/mp/mp_region.c: Likewise.
	* db2/mp/mp_sync.c: Likewise.
	* db2/mutex/mutex.c: Likewise.
	* db2/os/os_abs.c: Likewise.
	* db2/os/os_dir.c: Likewise.
	* db2/os/os_fid.c: Likewise.
	* db2/os/os_fsync.c: Likewise.
	* db2/os/os_func.c: Likewise.
	* db2/os/os_map.c: Likewise.
	* db2/os/os_oflags.c: Likewise.
	* db2/os/os_open.c: Likewise.
	* db2/os/os_rpath.c: Likewise.
	* db2/os/os_rw.c: Likewise.
	* db2/os/os_seek.c: Likewise.
	* db2/os/os_sleep.c: Likewise.
	* db2/os/os_stat.c: Likewise.
	* db2/os/os_unlink.c: Likewise.
	* db2/progs/db_deadlock/db_deadlock.c: Likewise.
	* db2/progs/db_dump/db_dump.c: Likewise.
	* db2/progs/db_load/db_load.c: Likewise.
	* db2/progs/db_recover/db_recover.c: Likewise.
	* db2/progs/db_stat/db_stat.c: Likewise.
	* db2/txn/txn.c: Likewise.
	* db2/txn/txn_auto.c: Likewise.
	* db2/txn/txn_rec.c: Likewise.
	* db2/os/db_os_abs.c: Removed.
	* db2/os/db_os_dir.c: Removed.
	* db2/os/db_os_fid.c: Removed.
	* db2/os/db_os_lseek.c: Removed.
	* db2/os/db_os_mmap.c: Removed.
	* db2/os/db_os_open.c: Removed.
	* db2/os/db_os_rw.c: Removed.
	* db2/os/db_os_sleep.c: Removed.
	* db2/os/db_os_stat.c: Removed.
	* db2/os/db_os_unlink.c: Removed.

	* libio/stdio.h (fopen): Add __restrict to parameters.

	* manual/process.texi (system): Describe behaviour for NULL argument.

	* stdio-common/printf-parse.h: Parse hh modifier.
	* stdio-common/vfprintf.c: Handle hh modifier.
	* stdio-common/vfscanf.c: Likewise.
	* manual/stdio.texi: Describe hh modifier for scanf/printf.

	* math/complex.h: Don't define _Imaginary_I, but instead _Complex_I.
	gcc does no yet know the `imaginary' keyword.

	* math/test-math.c: Add little test for know gcc bug.

	* math/tgmath.h: Make complex versions of log10() only available
	if __USE_GNU.

	* stdlib/test-canon.c: Fix typo.

	* sysdeps/generic/setenv.c: Avoid compilation warnings.
	Reported by Jim Meyering.

	* sysdeps/generic/bits/errno.h: EILSEQ is an ISO C error number.
	* sysdeps/mach/hurd/bits/errno.h: Likewise.
	* sysdeps/standalone/bits/errno.h: Likewise.
	* sysdeps/unix/sysv/linux/bits/errno.h: Likewise.

	* sysdeps/i386/i586/memcpy.S: New file.
	* sysdeps/i386/i586/mempcpy.S: New file.

	* sysdeps/i386/i586/memset.S: Fix typo.

	* sysdeps/posix/getcwd.c: Define HAVE_MEMPCPY for _LIBC.  Add casts.

	* sysdeps/posix/system.c: Add comment to explain code.

	* sysdeps/wordsize-32/inttypes.h: Include <stddef.h> for wchar_t.
	Define PTRDIFF_{MIN,MAX}, SIG_ATOMIC_{MIN,MAX}, SIZE_MAX,
	WCHAR_{MIN,MAX}, WINT_{MIN,MAX}.
	Define wcstoimax, wcstoumax.
	* sysdeps/wordsize-64/inttypes.h: Likewise.

	* wcsmbs/wchar.h: Define WCHAR_{MIN,MAX} if not already defined.
	Declare __wcsto{l,ul,ll,ull}_internal only if not already done.

	* time/Makefile (routines): Add strfxtime.
	* time/strftime.c: Implement %F and %f format.
	* time/strfxtime.c: New file.
	* time/time.h: Define new types and symbols from ISO C 9X.

	* time/mktime.c: Little comment correction.

1997-11-10  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* sysdeps/libm-ieee754/s_sincosl.c: Fix typo.

	* sysdeps/libm-ieee754/s_tanl.c: Fix typo.

	* sysdeps/libm-ieee754/s_floorl.c: Correct typos.

	* sysdeps/libm-ieee754/e_remainderl.c: Replace
	EXTRACT_LDOUBLE_WORDS by GET_LDOUBLE_WORDS.

	* sysdeps/libm-ieee754/e_atan2l.c: Replace EXTRACT_LDOUBLE_WORDS
	by GET_LDOUBLE_WORDS.

	* sysdeps/libm-ieee754/s_scalbnl.c: Replace ";" by "," for correct
	variable declaration.
	* sysdeps/libm-ieee754/s_scalblnl.c: Likewise.

	* sysdeps/libm-ieee754/s_lrint.c (__lrint): Correct function.

	* math/libm-test.c (sqrt_test): Add test for sqrt (0.25).
	(asin_test): Add more test.

1997-11-10 23:34  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/libm-ieee754/e_asin.c: Add braces to make code clearer
	and to not confuse the poor compiler.
	* sysdeps/libm-ieee754/e_asinf.c: Likewise.
	Reported by vertex@cagent.com.

1997-11-09  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* elf/dl-lookup.c (do_lookup): Don't accept the base version if we
	require a specific one.

	* libio/oldfreopen.c: Bind old symbols to version GLIBC_2.0.
	* libio/oldiofopen.c: Likewise.
	* libio/oldstdfiles.c: Likewise.
	* libc.map: Export them.

1997-11-10 07:40  H.J. Lu  <hjl@gnu.ai.mit.edu>

	* stdlib/exit.c (exit): Handle recursive calls to exit ().

1997-11-09  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/m68k/fpu/s_llrint.c: Fixed to take double argument
	instead of long double.
	* sysdeps/m68k/fpu/s_llrintf.c: New file.
	* sysdeps/m68k/fpu/s_llrintl.c: New file.

	* sysdeps/libm-ieee754/s_llrint.c: Make compilable and fix
	overflow condition.
	* sysdeps/libm-ieee754/s_llrintf.c: Fix overflow condition.
	* sysdeps/libm-ieee754/s_llrintl.c: Likewise.
	* sysdeps/libm-ieee754/s_llround.c: Likewise.
	* sysdeps/libm-ieee754/s_llroundf.c: Likewise.
	* sysdeps/libm-ieee754/s_llroundl.c: Likewise.
	* sysdeps/libm-ieee754/s_lrint.c: Likewise.
	* sysdeps/libm-ieee754/s_lrintf.c: Likewise.
	* sysdeps/libm-ieee754/s_lrintl.c: Likewise.
	* sysdeps/libm-ieee754/s_lround.c: Likewise.
	* sysdeps/libm-ieee754/s_lroundf.c: Likewise.
	* sysdeps/libm-ieee754/s_lroundl.c: Likewise.

	* math/libm-test.c: Test all three variants of lrint and llrint.
	Fix typos in lround and llround tests.  Add tests for boundary
	cases for lrint and llround.

1997-11-08  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* manual/arith.texi: Misc doc fixes.
	* manual/ctype.texi: Likewise.
	* manual/pattern.texi: Likewise.
	* manual/terminal.texi: Likewise.

1997-11-08  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/sysv/linux/xstatconv.c: Use struct assignment
	instead of memcpy to let the compiler use whatever it regards as
	optimal.
	* sysdeps/unix/sysv/linux/alpha/xstatconv.c: Likewise.

1997-11-08  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/sysv/linux/Makefile (sysdep_headers)
	[$(subdir)=misc]: Add sys/prctl.h.
	* sysdeps/unix/sysv/linux/Dist: Distribute it.

1997-11-08  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* io/ftwtest-sh: Don't use the unknown which command, instead try
	pwd as /bin/pwd and /usr/bin/pwd.

1997-11-08  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* manual/maint.texi (Tools for Installation): Don't recommend
	broken version 3.76.1 of make.
	(Porting): Fix wording.

1997-11-06 06:13  H.J. Lu  <hjl@gnu.ai.mit.edu>

	* config.make.in (build-pic-default): New, defined with
	pic_default.

	* configure.in (pic_default): New, set to yes if PIC is
	default.

	* Makeconfig (CPPFLAGS-.o, CPPFLAGS-.op, CPPFLAGS-.og,
	CPPFLAGS-.ob): Add -DPIC if $(build-pic-default) is yes.

1997-11-09 18:15  Ulrich Drepper  <drepper@cygnus.com>

	* Makerules (libc.so): Fix typo.

	* csu/Makefile (CFLAGS-initfini.s): Correctly fix moving function
	definition.  Patch by Zack Weinberg <zack@rabi.phys.columbia.edu>.

	* stdlib/strtod.c: Handle numbers like 0.0e10000 correctly which
	produce ±0.0.  Reported by Joe Keane <jgk@jgk.org>.

	* sysdeps/libm-ieee754/s_ceill.c: Fix typos.
	* sysdeps/libm-ieee754/s_llrint.c: Correct code, it never worked.

1997-11-06 07:00  H.J. Lu  <hjl@gnu.ai.mit.edu>

	* sysdeps/unix/sysv/i386/i686/time.S: Removed.

1997-11-08 14:07  Thorsten Kukuk  <kukuk@vt.uni-paderborn.de>

	* nis/libnsl.map: Add __do_niscall2 for nis_cachemgr.

	* nis/nis_call.c: Set UDP resend timeout correct.

	* nis/nss_compat/compat-grp.c: Rewritten to make it faster.
	* nis/nss_compat/compat-pwd.c: Likewise.
	* nis/nss_compat/compat-spwd.c: Likewise.
	* nis/ypclnt.c: Fix UDP resend timeout, fix yp_bind/do_ypcall
	interaction.

	* inet/protocols/routed.h: Include sys/socket.h.
	* inet/protocols/talkd.h: Likewise.
	* inet/protocols/timed.h: Include rpc/types.h.
	* sunrpc/rpc/pmap_clnt.h: Include rpc/clnt.h.

1997-11-06 01:39  Ulrich Drepper  <drepper@cygnus.com>

	* Makerules (libc.so): Add missing closing brace.

1997-11-05  Brendan Kehoe  <brendan@lisa.cygnus.com>

	* libio.h (__P): Name its arg `p' instead of `params'.
	This was added solely to work around problems with
	the definition of __P in the Solaris math.h header.

9 files changed, 477 insertions, 179 deletions

diff --git a/db2/mp/mp_bh.c b/db2/mp/mp_bh.c
index fb6bc96ae7..a707603eec 100644
--- a/db2/mp/mp_bh.c
+++ b/db2/mp/mp_bh.c
@@ -7,7 +7,7 @@
 #include "config.h"
 
 #ifndef lint
-static const char sccsid[] = "@(#)mp_bh.c	10.16 (Sleepycat) 9/23/97";
+static const char sccsid[] = "@(#)mp_bh.c	10.21 (Sleepycat) 10/25/97";
 #endif /* not lint */
 
 #ifndef NO_SYSTEM_INCLUDES
@@ -94,10 +94,10 @@ __memp_bhwrite(dbmp, mfp, bhp, restartp, wrotep)
 	 * files that we have previously tried (and failed) to open.
 	 */
 	dbt.size = mfp->pgcookie_len;
-	dbt.data = ADDR(dbmp, mfp->pgcookie_off);
-	if (__memp_fopen(dbmp, ADDR(dbmp, mfp->path_off),
+	dbt.data = R_ADDR(dbmp, mfp->pgcookie_off);
+	if (__memp_fopen(dbmp, R_ADDR(dbmp, mfp->path_off),
 	    mfp->ftype, 0, 0, mfp->stat.st_pagesize,
-	    mfp->lsn_off, &dbt, ADDR(dbmp, mfp->fileid_off), 0, &dbmfp) != 0)
+	    mfp->lsn_off, &dbt, R_ADDR(dbmp, mfp->fileid_off), 0, &dbmfp) != 0)
 		return (0);
 
 found:	return (__memp_pgwrite(dbmfp, bhp, restartp, wrotep));
@@ -137,7 +137,7 @@ __memp_pgread(dbmfp, bhp, can_create)
 	ret = 0;
 	LOCKHANDLE(dbmp, dbmfp->mutexp);
 	if (dbmfp->fd == -1 || (ret =
-	    __db_lseek(dbmfp->fd, pagesize, bhp->pgno, 0, SEEK_SET)) != 0) {
+	    __db_seek(dbmfp->fd, pagesize, bhp->pgno, 0, SEEK_SET)) != 0) {
 		if (!can_create) {
 			if (dbmfp->fd == -1)
 				ret = EINVAL;
@@ -230,6 +230,7 @@ __memp_pgwrite(dbmfp, bhp, restartp, wrotep)
 
 	dbmp = dbmfp->dbmp;
 	dbenv = dbmp->dbenv;
+	mp = dbmp->mp;
 	mfp = dbmfp->mfp;
 
 	if (restartp != NULL)
@@ -277,8 +278,7 @@ __memp_pgwrite(dbmfp, bhp, restartp, wrotep)
 	}
 
 	/* Write the page out. */
-	if ((ret =
-	    __db_lseek(dbmfp->fd, pagesize, bhp->pgno, 0, SEEK_SET)) != 0)
+	if ((ret = __db_seek(dbmfp->fd, pagesize, bhp->pgno, 0, SEEK_SET)) != 0)
 		fail = "seek";
 	else if ((ret = __db_write(dbmfp->fd, bhp->buf, pagesize, &nw)) != 0)
 		fail = "write";
@@ -309,15 +309,23 @@ __memp_pgwrite(dbmfp, bhp, restartp, wrotep)
 	/* Clean up the flags based on a successful write. */
 	F_SET(bhp, BH_CALLPGIN);
 	F_CLR(bhp, BH_DIRTY | BH_LOCKED);
+
+	++mp->stat.st_page_clean;
+	--mp->stat.st_page_dirty;
+
 	UNLOCKBUFFER(dbmp, bhp);
 
 	/*
-	 * If we wrote a buffer which a checkpoint is waiting for, update
+	 * If we write a buffer for which a checkpoint is waiting, update
 	 * the count of pending buffers (both in the mpool as a whole and
 	 * for this file).  If the count for this file goes to zero, flush
 	 * the writes.
 	 *
 	 * XXX:
+	 * Don't lock the region around the sync, fsync(2) has no atomicity
+	 * issues.
+	 *
+	 * XXX:
 	 * We ignore errors from the sync -- it makes no sense to return an
 	 * error to the calling process, so set a flag causing the sync to
 	 * be retried later.
@@ -325,21 +333,15 @@ __memp_pgwrite(dbmfp, bhp, restartp, wrotep)
 	 * If the buffer we wrote has a LSN larger than the current largest
 	 * we've written for this checkpoint, update the saved value.
 	 */
-	mp = dbmp->mp;
 	if (F_ISSET(bhp, BH_WRITE)) {
 		if (log_compare(&lsn, &mp->lsn) > 0)
 			mp->lsn = lsn;
 		F_CLR(bhp, BH_WRITE);
 
 		--mp->lsn_cnt;
-		if (--mfp->lsn_cnt == 0) {
-			/*
-			 * Don't lock -- there are no atomicity issues for
-			 * fsync(2).
-			 */
-			if (__db_fsync(dbmfp->fd) != 0)
-				F_SET(mp, MP_LSN_RETRY);
-		}
+
+		if (--mfp->lsn_cnt == 0 && __db_fsync(dbmfp->fd) != 0)
+			F_SET(mp, MP_LSN_RETRY);
 	}
 
 	/* Update I/O statistics. */
@@ -391,7 +393,7 @@ __memp_pg(dbmfp, bhp, is_pgin)
 			dbtp = NULL;
 		else {
 			dbt.size = mfp->pgcookie_len;
-			dbt.data = ADDR(dbmp, mfp->pgcookie_off);
+			dbt.data = R_ADDR(dbmp, mfp->pgcookie_off);
 			dbtp = &dbt;
 		}
 		UNLOCKHANDLE(dbmp, dbmp->mutexp);
@@ -433,19 +435,21 @@ __memp_bhfree(dbmp, mfp, bhp, free_mem)
 {
 	size_t off;
 
-	/* Delete the buffer header from the MPOOL hash list. */
-	off = BUCKET(dbmp->mp, OFFSET(dbmp, mfp), bhp->pgno);
-	SH_TAILQ_REMOVE(&dbmp->htab[off], bhp, mq, __bh);
+	/* Delete the buffer header from the hash bucket queue. */
+	off = BUCKET(dbmp->mp, R_OFFSET(dbmp, mfp), bhp->pgno);
+	SH_TAILQ_REMOVE(&dbmp->htab[off], bhp, hq, __bh);
 
-	/* Delete the buffer header from the LRU chain. */
+	/* Delete the buffer header from the LRU queue. */
 	SH_TAILQ_REMOVE(&dbmp->mp->bhq, bhp, q, __bh);
 
 	/*
 	 * If we're not reusing it immediately, free the buffer header
 	 * and data for real.
 	 */
-	if (free_mem)
+	if (free_mem) {
 		__db_shalloc_free(dbmp->addr, bhp);
+		--dbmp->mp->stat.st_page_clean;
+	}
 }
 
 /*
@@ -474,13 +478,13 @@ __memp_upgrade(dbmp, dbmfp, mfp)
 		return (1);
 
 	/* Try the open. */
-	if (__db_fdopen(ADDR(dbmp, mfp->path_off), 0, 0, 0, &fd) != 0) {
+	if (__db_open(R_ADDR(dbmp, mfp->path_off), 0, 0, 0, &fd) != 0) {
 		F_SET(dbmfp, MP_UPGRADE_FAIL);
 		return (1);
 	}
 
 	/* Swap the descriptors and set the upgrade flag. */
-	(void)close(dbmfp->fd);
+	(void)__db_close(dbmfp->fd);
 	dbmfp->fd = fd;
 	F_SET(dbmfp, MP_UPGRADE);
 
diff --git a/db2/mp/mp_fget.c b/db2/mp/mp_fget.c
index a0364e92c3..3f99e60505 100644
--- a/db2/mp/mp_fget.c
+++ b/db2/mp/mp_fget.c
@@ -7,7 +7,7 @@
 #include "config.h"
 
 #ifndef lint
-static const char sccsid[] = "@(#)mp_fget.c	10.25 (Sleepycat) 9/23/97";
+static const char sccsid[] = "@(#)mp_fget.c	10.30 (Sleepycat) 10/25/97";
 #endif /* not lint */
 
 #ifndef NO_SYSTEM_INCLUDES
@@ -87,14 +87,14 @@ memp_fget(dbmfp, pgnoaddr, flags, addrp)
 	 * We want to switch threads as often as possible.  Sleep every time
 	 * we get a new page to make it more likely.
 	 */
-	if (__sleep_on_every_page_get && (dbmp->dbenv == NULL ||
-	    dbmp->dbenv->db_yield == NULL || dbmp->dbenv->db_yield() != 0))
+	if (__sleep_on_every_page_get &&
+	    (__db_yield == NULL || __db_yield() != 0))
 		__db_sleep(0, 1);
 #endif
 
 	mp = dbmp->mp;
 	mfp = dbmfp->mfp;
-	mf_offset = OFFSET(dbmp, mfp);
+	mf_offset = R_OFFSET(dbmp, mfp);
 	addr = NULL;
 	bhp = NULL;
 	b_incr = b_inserted = readonly_alloc = ret = 0;
@@ -137,7 +137,7 @@ memp_fget(dbmfp, pgnoaddr, flags, addrp)
 			}
 		}
 		if (!readonly_alloc) {
-			addr = ADDR(dbmfp, *pgnoaddr * mfp->stat.st_pagesize);
+			addr = R_ADDR(dbmfp, *pgnoaddr * mfp->stat.st_pagesize);
 
 			++mp->stat.st_map;
 			++mfp->stat.st_map;
@@ -159,9 +159,12 @@ memp_fget(dbmfp, pgnoaddr, flags, addrp)
 		 */
 		if (dbmfp->fd == -1)
 			size = 0;
-		else if ((ret = __db_stat(dbmp->dbenv,
-		    dbmfp->path, dbmfp->fd, &size, NULL)) != 0)
+		else if ((ret =
+		    __db_ioinfo(dbmfp->path, dbmfp->fd, &size, NULL)) != 0) {
+			__db_err(dbmp->dbenv,
+			    "%s: %s", dbmfp->path, strerror(ret));
 			goto err;
+		}
 
 		*pgnoaddr = size == 0 ? 0 : (size - 1) / mfp->stat.st_pagesize;
 
@@ -190,26 +193,29 @@ memp_fget(dbmfp, pgnoaddr, flags, addrp)
 		goto found;
 	}
 
-	/* If we haven't checked the BH list yet, do the search. */
+	/* If we haven't checked the BH hash bucket queue, do the search. */
 	if (!LF_ISSET(DB_MPOOL_LAST | DB_MPOOL_NEW)) {
-		++mp->stat.st_hash_searches;
 		bucket = BUCKET(mp, mf_offset, *pgnoaddr);
 		for (cnt = 0,
 		    bhp = SH_TAILQ_FIRST(&dbmp->htab[bucket], __bh);
-		    bhp != NULL; bhp = SH_TAILQ_NEXT(bhp, mq, __bh)) {
+		    bhp != NULL; bhp = SH_TAILQ_NEXT(bhp, hq, __bh)) {
 			++cnt;
 			if (bhp->pgno == *pgnoaddr &&
 			    bhp->mf_offset == mf_offset) {
 				addr = bhp->buf;
+				++mp->stat.st_hash_searches;
 				if (cnt > mp->stat.st_hash_longest)
 					mp->stat.st_hash_longest = cnt;
 				mp->stat.st_hash_examined += cnt;
 				goto found;
 			}
 		}
-		if (cnt > mp->stat.st_hash_longest)
-			mp->stat.st_hash_longest = cnt;
-		mp->stat.st_hash_examined += cnt;
+		if (cnt != 0) {
+			++mp->stat.st_hash_searches;
+			if (cnt > mp->stat.st_hash_longest)
+				mp->stat.st_hash_longest = cnt;
+			mp->stat.st_hash_examined += cnt;
+		}
 	}
 
 	/*
@@ -239,8 +245,9 @@ memp_fget(dbmfp, pgnoaddr, flags, addrp)
 	 * our region lock without screwing up the world.
 	 */
 	bucket = BUCKET(mp, mf_offset, *pgnoaddr);
-	SH_TAILQ_INSERT_HEAD(&dbmp->htab[bucket], bhp, mq, __bh);
+	SH_TAILQ_INSERT_HEAD(&dbmp->htab[bucket], bhp, hq, __bh);
 	SH_TAILQ_INSERT_TAIL(&mp->bhq, bhp, q);
+	++mp->stat.st_page_clean;
 	b_inserted = 1;
 
 	/* Set the page number, and associated MPOOLFILE. */
@@ -281,7 +288,8 @@ reread:		if ((ret = __memp_pgread(dbmfp,
 		 * !!!
 		 * The __memp_pgread call discarded and reacquired the region
 		 * lock.  Because the buffer reference count was incremented
-		 * before the region lock was discarded the buffer didn't move.
+		 * before the region lock was discarded the buffer can't move
+		 * and its contents can't change.
 		 */
 		++mp->stat.st_cache_miss;
 		++mfp->stat.st_cache_miss;
@@ -305,7 +313,8 @@ found:		/* Increment the reference count. */
 		 * BH_LOCKED --
 		 * I/O in progress, wait for it to finish.  Because the buffer
 		 * reference count was incremented before the region lock was
-		 * discarded we know the buffer didn't move.
+		 * discarded we know the buffer can't move and its contents
+		 * can't change.
 		 */
 		if (F_ISSET(bhp, BH_LOCKED)) {
 			UNLOCKREGION(dbmp);
diff --git a/db2/mp/mp_fopen.c b/db2/mp/mp_fopen.c
index 5ab807701c..de59c9ea9b 100644
--- a/db2/mp/mp_fopen.c
+++ b/db2/mp/mp_fopen.c
@@ -7,7 +7,7 @@
 #include "config.h"
 
 #ifndef lint
-static const char sccsid[] = "@(#)mp_fopen.c	10.27 (Sleepycat) 9/23/97";
+static const char sccsid[] = "@(#)mp_fopen.c	10.30 (Sleepycat) 10/25/97";
 #endif /* not lint */
 
 #ifndef NO_SYSTEM_INCLUDES
@@ -92,7 +92,7 @@ __memp_fopen(dbmp, path,
 
 	/* Allocate and initialize the per-process structure. */
 	if ((dbmfp =
-	    (DB_MPOOLFILE *)calloc(1, sizeof(DB_MPOOLFILE))) == NULL) {
+	    (DB_MPOOLFILE *)__db_calloc(1, sizeof(DB_MPOOLFILE))) == NULL) {
 		__db_err(dbenv, "%s: %s",
 		    path == NULL ? TEMPORARY : path, strerror(ENOMEM));
 		return (ENOMEM);
@@ -120,7 +120,7 @@ __memp_fopen(dbmp, path,
 
 
 		/* Open the file. */
-		if ((ret = __db_fdopen(dbmfp->path,
+		if ((ret = __db_open(dbmfp->path,
 		    LF_ISSET(DB_CREATE | DB_RDONLY), DB_CREATE | DB_RDONLY,
 		    mode, &dbmfp->fd)) != 0) {
 			__db_err(dbenv, "%s: %s", dbmfp->path, strerror(ret));
@@ -128,9 +128,11 @@ __memp_fopen(dbmp, path,
 		}
 
 		/* Don't permit files that aren't a multiple of the pagesize. */
-		if ((ret = __db_stat(dbenv,
-		     dbmfp->path, dbmfp->fd, &size, NULL)) != 0)
+		if ((ret =
+		    __db_ioinfo(dbmfp->path, dbmfp->fd, &size, NULL)) != 0) {
+			__db_err(dbenv, "%s: %s", dbmfp->path, strerror(ret));
 			goto err;
+		}
 		if (size % pagesize) {
 			__db_err(dbenv,
 			    "%s: file size not a multiple of the pagesize",
@@ -198,7 +200,7 @@ __memp_fopen(dbmp, path,
 	dbmfp->addr = NULL;
 	if (mfp->can_mmap) {
 		dbmfp->len = size;
-		if (__db_mmap(dbmfp->fd, dbmfp->len, 1, 1, &dbmfp->addr) != 0) {
+		if (__db_map(dbmfp->fd, dbmfp->len, 1, 1, &dbmfp->addr) != 0) {
 			mfp->can_mmap = 0;
 			dbmfp->addr = NULL;
 		}
@@ -264,7 +266,7 @@ __memp_mf_open(dbmp, dbmfp,
 	for (mfp = SH_TAILQ_FIRST(&dbmp->mp->mpfq, __mpoolfile);
 	    mfp != NULL; mfp = SH_TAILQ_NEXT(mfp, q, __mpoolfile))
 		if (!memcmp(fileid,
-		    ADDR(dbmp, mfp->fileid_off), DB_FILE_ID_LEN)) {
+		    R_ADDR(dbmp, mfp->fileid_off), DB_FILE_ID_LEN)) {
 			if (ftype != mfp->ftype ||
 			    pagesize != mfp->stat.st_pagesize) {
 				__db_err(dbmp->dbenv,
@@ -325,10 +327,10 @@ alloc:	if ((ret = __memp_ralloc(dbmp, sizeof(MPOOLFILE), NULL, &mfp)) != 0)
 	if (0) {
 err:		if (mfp->path_off != 0)
 			__db_shalloc_free(dbmp->addr,
-			    ADDR(dbmp, mfp->path_off));
+			    R_ADDR(dbmp, mfp->path_off));
 		if (!istemp)
 			__db_shalloc_free(dbmp->addr,
-			    ADDR(dbmp, mfp->fileid_off));
+			    R_ADDR(dbmp, mfp->fileid_off));
 		if (mfp != NULL)
 			__db_shalloc_free(dbmp->addr, mfp);
 		mfp = NULL;
@@ -367,7 +369,7 @@ memp_fclose(dbmfp)
 
 	/* Discard any mmap information. */
 	if (dbmfp->addr != NULL &&
-	    (ret = __db_munmap(dbmfp->addr, dbmfp->len)) != 0)
+	    (ret = __db_unmap(dbmfp->addr, dbmfp->len)) != 0)
 		__db_err(dbmp->dbenv, "%s: %s", dbmfp->path, strerror(ret));
 
 	/* Close the file; temporary files may not yet have been created. */
@@ -423,7 +425,7 @@ __memp_mf_close(dbmp, dbmfp)
 	 * fairly expensive to reintegrate the buffers back into the region for
 	 * no purpose.
 	 */
-	mf_offset = OFFSET(dbmp, mfp);
+	mf_offset = R_OFFSET(dbmp, mfp);
 	for (bhp = SH_TAILQ_FIRST(&mp->bhq, __bh); bhp != NULL; bhp = nbhp) {
 		nbhp = SH_TAILQ_NEXT(bhp, q, __bh);
 
@@ -436,6 +438,10 @@ __memp_mf_close(dbmp, dbmfp)
 #endif
 
 		if (bhp->mf_offset == mf_offset) {
+			if (F_ISSET(bhp, BH_DIRTY)) {
+				++mp->stat.st_page_clean;
+				--mp->stat.st_page_dirty;
+			}
 			__memp_bhfree(dbmp, mfp, bhp, 0);
 			SH_TAILQ_INSERT_HEAD(&mp->bhfq, bhp, q, __bh);
 		}
@@ -446,11 +452,11 @@ __memp_mf_close(dbmp, dbmfp)
 
 	/* Free the space. */
 	__db_shalloc_free(dbmp->addr, mfp);
-	__db_shalloc_free(dbmp->addr, ADDR(dbmp, mfp->path_off));
+	__db_shalloc_free(dbmp->addr, R_ADDR(dbmp, mfp->path_off));
 	if (mfp->fileid_off != 0)
-		__db_shalloc_free(dbmp->addr, ADDR(dbmp, mfp->fileid_off));
+		__db_shalloc_free(dbmp->addr, R_ADDR(dbmp, mfp->fileid_off));
 	if (mfp->pgcookie_off != 0)
-		__db_shalloc_free(dbmp->addr, ADDR(dbmp, mfp->pgcookie_off));
+		__db_shalloc_free(dbmp->addr, R_ADDR(dbmp, mfp->pgcookie_off));
 
 ret1:	UNLOCKREGION(dbmp);
 	return (0);
diff --git a/db2/mp/mp_fput.c b/db2/mp/mp_fput.c
index 9ea7cd9d0d..892f179d3a 100644
--- a/db2/mp/mp_fput.c
+++ b/db2/mp/mp_fput.c
@@ -7,7 +7,7 @@
 #include "config.h"
 
 #ifndef lint
-static const char sccsid[] = "@(#)mp_fput.c	10.12 (Sleepycat) 9/23/97";
+static const char sccsid[] = "@(#)mp_fput.c	10.14 (Sleepycat) 10/5/97";
 #endif /* not lint */
 
 #ifndef NO_SYSTEM_INCLUDES
@@ -35,10 +35,12 @@ memp_fput(dbmfp, pgaddr, flags)
 {
 	BH *bhp;
 	DB_MPOOL *dbmp;
+	MPOOL *mp;
 	MPOOLFILE *mfp;
 	int wrote, ret;
 
 	dbmp = dbmfp->dbmp;
+	mp = dbmp->mp;
 
 	/* Validate arguments. */
 	if (flags) {
@@ -82,10 +84,16 @@ memp_fput(dbmfp, pgaddr, flags)
 	LOCKREGION(dbmp);
 
 	/* Set/clear the page bits. */
-	if (LF_ISSET(DB_MPOOL_CLEAN))
+	if (LF_ISSET(DB_MPOOL_CLEAN) && F_ISSET(bhp, BH_DIRTY)) {
+		++mp->stat.st_page_clean;
+		--mp->stat.st_page_dirty;
 		F_CLR(bhp, BH_DIRTY);
-	if (LF_ISSET(DB_MPOOL_DIRTY))
+	}
+	if (LF_ISSET(DB_MPOOL_DIRTY) && !F_ISSET(bhp, BH_DIRTY)) {
+		--mp->stat.st_page_clean;
+		++mp->stat.st_page_dirty;
 		F_SET(bhp, BH_DIRTY);
+	}
 	if (LF_ISSET(DB_MPOOL_DISCARD))
 		F_SET(bhp, BH_DISCARD);
 
@@ -108,11 +116,11 @@ memp_fput(dbmfp, pgaddr, flags)
 	}
 
 	/* Move the buffer to the head/tail of the LRU chain. */
-	SH_TAILQ_REMOVE(&dbmp->mp->bhq, bhp, q, __bh);
+	SH_TAILQ_REMOVE(&mp->bhq, bhp, q, __bh);
 	if (F_ISSET(bhp, BH_DISCARD))
-		SH_TAILQ_INSERT_HEAD(&dbmp->mp->bhq, bhp, q, __bh);
+		SH_TAILQ_INSERT_HEAD(&mp->bhq, bhp, q, __bh);
 	else
-		SH_TAILQ_INSERT_TAIL(&dbmp->mp->bhq, bhp, q);
+		SH_TAILQ_INSERT_TAIL(&mp->bhq, bhp, q);
 
 	/*
 	 * If this buffer is scheduled for writing because of a checkpoint,
@@ -125,14 +133,14 @@ memp_fput(dbmfp, pgaddr, flags)
 		if (F_ISSET(bhp, BH_DIRTY)) {
 			if (__memp_bhwrite(dbmp,
 			    dbmfp->mfp, bhp, NULL, &wrote) != 0 || !wrote)
-				F_SET(dbmp->mp, MP_LSN_RETRY);
+				F_SET(mp, MP_LSN_RETRY);
 		} else {
 			F_CLR(bhp, BH_WRITE);
 
-			mfp = ADDR(dbmp, bhp->mf_offset);
+			mfp = R_ADDR(dbmp, bhp->mf_offset);
 			--mfp->lsn_cnt;
 
-			--dbmp->mp->lsn_cnt;
+			--mp->lsn_cnt;
 		}
 
 	UNLOCKREGION(dbmp);
diff --git a/db2/mp/mp_fset.c b/db2/mp/mp_fset.c
index a3a3dcef9c..a7d2706008 100644
--- a/db2/mp/mp_fset.c
+++ b/db2/mp/mp_fset.c
@@ -7,7 +7,7 @@
 #include "config.h"
 
 #ifndef lint
-static const char sccsid[] = "@(#)mp_fset.c	10.9 (Sleepycat) 9/20/97";
+static const char sccsid[] = "@(#)mp_fset.c	10.10 (Sleepycat) 10/5/97";
 #endif /* not lint */
 
 #ifndef NO_SYSTEM_INCLUDES
@@ -34,9 +34,13 @@ memp_fset(dbmfp, pgaddr, flags)
 {
 	BH *bhp;
 	DB_MPOOL *dbmp;
+	MPOOL *mp;
+	MPOOLFILE *mfp;
 	int ret;
 
 	dbmp = dbmfp->dbmp;
+	mfp = dbmfp->mfp;
+	mp = dbmp->mp;
 
 	/* Validate arguments. */
 	if (flags != 0) {
@@ -60,10 +64,16 @@ memp_fset(dbmfp, pgaddr, flags)
 
 	LOCKREGION(dbmp);
 
-	if (LF_ISSET(DB_MPOOL_DIRTY))
-		F_SET(bhp, BH_DIRTY);
-	if (LF_ISSET(DB_MPOOL_CLEAN))
+	if (LF_ISSET(DB_MPOOL_CLEAN) && F_ISSET(bhp, BH_DIRTY)) {
+		++mp->stat.st_page_clean;
+		--mp->stat.st_page_dirty;
 		F_CLR(bhp, BH_DIRTY);
+	}
+	if (LF_ISSET(DB_MPOOL_DIRTY) && !F_ISSET(bhp, BH_DIRTY)) {
+		--mp->stat.st_page_clean;
+		++mp->stat.st_page_dirty;
+		F_SET(bhp, BH_DIRTY);
+	}
 	if (LF_ISSET(DB_MPOOL_DISCARD))
 		F_SET(bhp, BH_DISCARD);
 
diff --git a/db2/mp/mp_open.c b/db2/mp/mp_open.c
index f622b1ed26..4c19739ebd 100644
--- a/db2/mp/mp_open.c
+++ b/db2/mp/mp_open.c
@@ -7,7 +7,7 @@
 #include "config.h"
 
 #ifndef lint
-static const char sccsid[] = "@(#)mp_open.c	10.13 (Sleepycat) 9/23/97";
+static const char sccsid[] = "@(#)mp_open.c	10.15 (Sleepycat) 10/25/97";
 #endif /* not lint */
 
 #ifndef NO_SYSTEM_INCLUDES
@@ -54,7 +54,7 @@ memp_open(path, flags, mode, dbenv, retp)
 	cachesize = dbenv == NULL ? 0 : dbenv->mp_size;
 
 	/* Create and initialize the DB_MPOOL structure. */
-	if ((dbmp = (DB_MPOOL *)calloc(1, sizeof(DB_MPOOL))) == NULL)
+	if ((dbmp = (DB_MPOOL *)__db_calloc(1, sizeof(DB_MPOOL))) == NULL)
 		return (ENOMEM);
 	LIST_INIT(&dbmp->dbregq);
 	TAILQ_INIT(&dbmp->dbmfq);
@@ -62,8 +62,7 @@ memp_open(path, flags, mode, dbenv, retp)
 	dbmp->dbenv = dbenv;
 
 	/* Decide if it's possible for anyone else to access the pool. */
-	if ((dbenv == NULL && path == NULL) ||
-	    (dbenv != NULL && F_ISSET(dbenv, DB_MPOOL_PRIVATE)))
+	if ((dbenv == NULL && path == NULL) || LF_ISSET(DB_MPOOL_PRIVATE))
 		F_SET(dbmp, MP_ISPRIVATE);
 
 	/*
@@ -183,7 +182,7 @@ memp_register(dbmp, ftype, pgin, pgout)
 {
 	DB_MPREG *mpr;
 
-	if ((mpr = (DB_MPREG *)malloc(sizeof(DB_MPREG))) == NULL)
+	if ((mpr = (DB_MPREG *)__db_malloc(sizeof(DB_MPREG))) == NULL)
 		return (ENOMEM);
 
 	mpr->ftype = ftype;
diff --git a/db2/mp/mp_pr.c b/db2/mp/mp_pr.c
index 7794cfa7f3..01f0920df4 100644
--- a/db2/mp/mp_pr.c
+++ b/db2/mp/mp_pr.c
@@ -7,7 +7,7 @@
 #include "config.h"
 
 #ifndef lint
-static const char sccsid[] = "@(#)mp_pr.c	10.13 (Sleepycat) 8/27/97";
+static const char sccsid[] = "@(#)mp_pr.c	10.18 (Sleepycat) 11/1/97";
 #endif /* not lint */
 
 #ifndef NO_SYSTEM_INCLUDES
@@ -53,7 +53,7 @@ memp_stat(dbmp, gspp, fspp, db_malloc)
 		*gspp = NULL;
 
 		if ((*gspp = db_malloc == NULL ?
-		    (DB_MPOOL_STAT *)malloc(sizeof(**gspp)) :
+		    (DB_MPOOL_STAT *)__db_malloc(sizeof(**gspp)) :
 		    (DB_MPOOL_STAT *)db_malloc(sizeof(**gspp))) == NULL)
 			return (ENOMEM);
 
@@ -62,6 +62,10 @@ memp_stat(dbmp, gspp, fspp, db_malloc)
 		/* Copy out the global statistics. */
 		**gspp = dbmp->mp->stat;
 		(*gspp)->st_hash_buckets = dbmp->mp->htab_buckets;
+		(*gspp)->st_region_wait =
+		    dbmp->mp->rlayout.lock.mutex_set_wait;
+		(*gspp)->st_region_nowait =
+		    dbmp->mp->rlayout.lock.mutex_set_nowait;
 
 		UNLOCKREGION(dbmp);
 	}
@@ -85,7 +89,7 @@ memp_stat(dbmp, gspp, fspp, db_malloc)
 		/* Allocate space for the pointers. */
 		len = (len + 1) * sizeof(DB_MPOOL_FSTAT *);
 		if ((*fspp = db_malloc == NULL ?
-		    (DB_MPOOL_FSTAT **)malloc(len) :
+		    (DB_MPOOL_FSTAT **)__db_malloc(len) :
 		    (DB_MPOOL_FSTAT **)db_malloc(len)) == NULL)
 			return (ENOMEM);
 
@@ -96,11 +100,11 @@ memp_stat(dbmp, gspp, fspp, db_malloc)
 		    mfp = SH_TAILQ_FIRST(&dbmp->mp->mpfq, __mpoolfile);
 		    mfp != NULL;
 		    ++tfsp, mfp = SH_TAILQ_NEXT(mfp, q, __mpoolfile)) {
-			name = ADDR(dbmp, mfp->path_off);
+			name = R_ADDR(dbmp, mfp->path_off);
 			nlen = strlen(name);
 			len = sizeof(DB_MPOOL_FSTAT) + nlen + 1;
 			if ((*tfsp = db_malloc == NULL ?
-			    (DB_MPOOL_FSTAT *)malloc(len) :
+			    (DB_MPOOL_FSTAT *)__db_malloc(len) :
 			    (DB_MPOOL_FSTAT *)db_malloc(len)) == NULL)
 				return (ENOMEM);
 			**tfsp = mfp->stat;
@@ -200,18 +204,19 @@ __memp_pmp(fp, dbmp, mp, data)
 	(void)fprintf(fp, "references: %lu; cachesize: %lu\n",
 	    (u_long)mp->rlayout.refcnt, (u_long)mp->stat.st_cachesize);
 	(void)fprintf(fp,
-	    "    %lu pages created\n", mp->stat.st_page_create);
+	    "    %lu pages created\n", (u_long)mp->stat.st_page_create);
 	(void)fprintf(fp,
-	    "    %lu mmap pages returned\n", mp->stat.st_map);
+	    "    %lu mmap pages returned\n", (u_long)mp->stat.st_map);
 	(void)fprintf(fp, "    %lu I/O's (%lu read, %lu written)\n",
-	    mp->stat.st_page_in + mp->stat.st_page_out,
-	    mp->stat.st_page_in, mp->stat.st_page_out);
+	    (u_long)mp->stat.st_page_in + mp->stat.st_page_out,
+	    (u_long)mp->stat.st_page_in, (u_long)mp->stat.st_page_out);
 	if (mp->stat.st_cache_hit + mp->stat.st_cache_miss != 0)
 		(void)fprintf(fp,
 		    "    %.0f%% cache hit rate (%lu hit, %lu miss)\n",
 		    ((double)mp->stat.st_cache_hit /
 	    (mp->stat.st_cache_hit + mp->stat.st_cache_miss)) * 100,
-		    mp->stat.st_cache_hit, mp->stat.st_cache_miss);
+		    (u_long)mp->stat.st_cache_hit,
+		    (u_long)mp->stat.st_cache_miss);
 
 	/* Display the MPOOLFILE structures. */
 	for (cnt = 0, mfp = SH_TAILQ_FIRST(&dbmp->mp->mpfq, __mpoolfile);
@@ -230,17 +235,18 @@ __memp_pmp(fp, dbmp, mp, data)
 	(void)fprintf(fp, "%s\nHASH table of BH's (%lu buckets):\n",
 	    DB_LINE, (u_long)mp->htab_buckets);
 	(void)fprintf(fp,
-	    "longest chain searched %lu\n", mp->stat.st_hash_longest);
+	    "longest chain searched %lu\n", (u_long)mp->stat.st_hash_longest);
 	(void)fprintf(fp, "average chain searched %lu (total/calls: %lu/%lu)\n",
-	    mp->stat.st_hash_examined /
+	    (u_long)mp->stat.st_hash_examined /
 	    (mp->stat.st_hash_searches ? mp->stat.st_hash_searches : 1),
-	    mp->stat.st_hash_examined, mp->stat.st_hash_searches);
+	    (u_long)mp->stat.st_hash_examined,
+	    (u_long)mp->stat.st_hash_searches);
 	for (htabp = dbmp->htab,
 	    bucket = 0; bucket < mp->htab_buckets; ++htabp, ++bucket) {
 		if (SH_TAILQ_FIRST(&dbmp->htab[bucket], __bh) != NULL)
 			(void)fprintf(fp, "%lu:\n", (u_long)bucket);
 		for (bhp = SH_TAILQ_FIRST(&dbmp->htab[bucket], __bh);
-		    bhp != NULL; bhp = SH_TAILQ_NEXT(bhp, mq, __bh))
+		    bhp != NULL; bhp = SH_TAILQ_NEXT(bhp, hq, __bh))
 			__memp_pbh(fp, dbmp, bhp, data);
 	}
 
@@ -249,7 +255,7 @@ __memp_pmp(fp, dbmp, mp, data)
 	for (sep = "\n    ", bhp = SH_TAILQ_FIRST(&dbmp->mp->bhq, __bh);
 	    bhp != NULL; sep = ", ", bhp = SH_TAILQ_NEXT(bhp, q, __bh))
 		(void)fprintf(fp, "%s%lu/%lu", sep,
-		    (u_long)bhp->pgno, (u_long)OFFSET(dbmp, bhp));
+		    (u_long)bhp->pgno, (u_long)R_OFFSET(dbmp, bhp));
 	(void)fprintf(fp, "\n");
 }
 
@@ -263,16 +269,18 @@ __memp_pmf(fp, mfp, data)
 	MPOOLFILE *mfp;
 	int data;
 {
-	(void)fprintf(fp, "    %lu pages created\n", mfp->stat.st_page_create);
+	(void)fprintf(fp, "    %lu pages created\n",
+	    (u_long)mfp->stat.st_page_create);
 	(void)fprintf(fp, "    %lu I/O's (%lu read, %lu written)\n",
-	    mfp->stat.st_page_in + mfp->stat.st_page_out,
-	    mfp->stat.st_page_in, mfp->stat.st_page_out);
+	    (u_long)mfp->stat.st_page_in + mfp->stat.st_page_out,
+	    (u_long)mfp->stat.st_page_in, (u_long)mfp->stat.st_page_out);
 	if (mfp->stat.st_cache_hit + mfp->stat.st_cache_miss != 0)
 		(void)fprintf(fp,
 		    "    %.0f%% cache hit rate (%lu hit, %lu miss)\n",
 		    ((double)mfp->stat.st_cache_hit /
 		    (mfp->stat.st_cache_hit + mfp->stat.st_cache_miss)) * 100,
-		    mfp->stat.st_cache_hit, mfp->stat.st_cache_miss);
+		    (u_long)mfp->stat.st_cache_hit,
+		    (u_long)mfp->stat.st_cache_miss);
 	if (!data)
 		return;
 
@@ -298,7 +306,7 @@ __memp_pbh(fp, dbmp, bhp, data)
 		return;
 
 	(void)fprintf(fp, "    BH @ %lu (mf: %lu): page %lu; ref %lu",
-	    (u_long)OFFSET(dbmp, bhp),
+	    (u_long)R_OFFSET(dbmp, bhp),
 	    (u_long)bhp->mf_offset, (u_long)bhp->pgno, (u_long)bhp->ref);
 	sep = "; ";
 	if (F_ISSET(bhp, BH_DIRTY)) {
diff --git a/db2/mp/mp_region.c b/db2/mp/mp_region.c
index a5c52123b9..6b2f93125c 100644
--- a/db2/mp/mp_region.c
+++ b/db2/mp/mp_region.c
@@ -7,7 +7,7 @@
 #include "config.h"
 
 #ifndef lint
-static const char sccsid[] = "@(#)mp_region.c	10.11 (Sleepycat) 8/2/97";
+static const char sccsid[] = "@(#)mp_region.c	10.16 (Sleepycat) 10/25/97";
 #endif /* not lint */
 
 #ifndef NO_SYSTEM_INCLUDES
@@ -51,7 +51,7 @@ __memp_ralloc(dbmp, len, offsetp, retp)
 	nomore = 0;
 alloc:	if ((ret = __db_shalloc(dbmp->addr, len, MUTEX_ALIGNMENT, &p)) == 0) {
 		if (offsetp != NULL)
-			*offsetp = OFFSET(dbmp, p);
+			*offsetp = R_OFFSET(dbmp, p);
 		*(void **)retp = p;
 		return (0);
 	}
@@ -68,7 +68,7 @@ alloc:	if ((ret = __db_shalloc(dbmp->addr, len, MUTEX_ALIGNMENT, &p)) == 0) {
 		if (__db_shsizeof(bhp) == len) {
 			SH_TAILQ_REMOVE(&mp->bhfq, bhp, q, __bh);
 			if (offsetp != NULL)
-				*offsetp = OFFSET(dbmp, bhp);
+				*offsetp = R_OFFSET(dbmp, bhp);
 			*(void **)retp = bhp;
 			return (0);
 		}
@@ -82,6 +82,7 @@ alloc:	if ((ret = __db_shalloc(dbmp->addr, len, MUTEX_ALIGNMENT, &p)) == 0) {
 
 		SH_TAILQ_REMOVE(&mp->bhfq, bhp, q, __bh);
 		__db_shalloc_free(dbmp->addr, bhp);
+		--mp->stat.st_page_clean;
 
 		/*
 		 * Retry as soon as we've freed up sufficient space.  If we
@@ -104,7 +105,7 @@ retry:	/* Find a buffer we can flush; pure LRU. */
 			continue;
 
 		/* Find the associated MPOOLFILE. */
-		mfp = ADDR(dbmp, bhp->mf_offset);
+		mfp = R_ADDR(dbmp, bhp->mf_offset);
 
 		/*
 		 * Write the page if it's dirty.
@@ -135,8 +136,7 @@ retry:	/* Find a buffer we can flush; pure LRU. */
 			else {
 				if (restart)
 					goto retry;
-				else
-					continue;
+				continue;
 			}
 		} else
 			++mp->stat.st_ro_evict;
@@ -150,7 +150,7 @@ retry:	/* Find a buffer we can flush; pure LRU. */
 			__memp_bhfree(dbmp, mfp, bhp, 0);
 
 			if (offsetp != NULL)
-				*offsetp = OFFSET(dbmp, bhp);
+				*offsetp = R_OFFSET(dbmp, bhp);
 			*(void **)retp = bhp;
 			return (0);
 		}
@@ -225,9 +225,13 @@ retry:	if (LF_ISSET(DB_CREATE)) {
 		 * be possible for DB_THREAD to be set if HAVE_SPINLOCKS aren't
 		 * defined.
 		 */
-		if (F_ISSET(dbmp, MP_ISPRIVATE))
-			ret = (dbmp->maddr = malloc(rlen)) == NULL ? ENOMEM : 0;
-		else
+		if (F_ISSET(dbmp, MP_ISPRIVATE)) {
+			if ((dbmp->maddr = __db_malloc(rlen)) == NULL)
+				ret = ENOMEM;
+			else
+				ret = __db_rinit(dbmp->dbenv,
+				    dbmp->maddr, 0, rlen, 0);
+		} else
 			ret = __db_rcreate(dbmp->dbenv, DB_APP_NONE, path,
 			    DB_DEFAULT_MPOOL_FILE, mode, rlen, &fd,
 			    &dbmp->maddr);
@@ -259,7 +263,10 @@ retry:	if (LF_ISSET(DB_CREATE)) {
 			    0, &dbmp->htab)) != 0)
 				goto err;
 			__db_hashinit(dbmp->htab, mp->htab_buckets);
-			mp->htab = OFFSET(dbmp, dbmp->htab);
+			mp->htab = R_OFFSET(dbmp, dbmp->htab);
+
+			ZERO_LSN(mp->lsn);
+			mp->lsn_cnt = 0;
 
 			memset(&mp->stat, 0, sizeof(mp->stat));
 			mp->stat.st_cachesize = cachesize;
@@ -303,7 +310,7 @@ retry:	if (LF_ISSET(DB_CREATE)) {
 	 * Get the hash table address; it's on the shared page, so we have
 	 * to lock first.
 	 */
-	dbmp->htab = ADDR(dbmp, dbmp->mp->htab);
+	dbmp->htab = R_ADDR(dbmp, dbmp->mp->htab);
 
 	dbmp->fd = fd;
 
@@ -333,7 +340,7 @@ __memp_rclose(dbmp)
 	DB_MPOOL *dbmp;
 {
 	if (F_ISSET(dbmp, MP_ISPRIVATE)) {
-		free(dbmp->maddr);
+		__db_free(dbmp->maddr);
 		return (0);
 	}
 	return (__db_rclose(dbmp->dbenv, dbmp->fd, dbmp->maddr));
diff --git a/db2/mp/mp_sync.c b/db2/mp/mp_sync.c
index 65b2a18267..2f042df9e1 100644
--- a/db2/mp/mp_sync.c
+++ b/db2/mp/mp_sync.c
@@ -7,13 +7,14 @@
 #include "config.h"
 
 #ifndef lint
-static const char sccsid[] = "@(#)mp_sync.c	10.9 (Sleepycat) 8/29/97";
+static const char sccsid[] = "@(#)mp_sync.c	10.15 (Sleepycat) 11/1/97";
 #endif /* not lint */
 
 #ifndef NO_SYSTEM_INCLUDES
 #include <sys/types.h>
 
 #include <errno.h>
+#include <stdlib.h>
 #include <string.h>
 #endif
 
@@ -23,6 +24,8 @@ static const char sccsid[] = "@(#)mp_sync.c	10.9 (Sleepycat) 8/29/97";
 #include "mp.h"
 #include "common_ext.h"
 
+static int __bhcmp __P((const void *, const void *));
+
 /*
  * memp_sync --
  *	Mpool sync function.
@@ -32,27 +35,40 @@ memp_sync(dbmp, lsnp)
 	DB_MPOOL *dbmp;
 	DB_LSN *lsnp;
 {
-	BH *bhp;
+	BH *bhp, **bharray;
 	DB_ENV *dbenv;
 	MPOOL *mp;
 	MPOOLFILE *mfp;
-	int can_write, wrote, lsn_cnt, restart, ret;
+	int ar_cnt, cnt, nalloc, next, notused, ret, wrote;
 
 	dbenv = dbmp->dbenv;
 
-	if (dbmp->dbenv->lg_info == NULL) {
-		__db_err(dbenv, "memp_sync requires logging");
+	if (dbenv->lg_info == NULL) {
+		__db_err(dbenv, "memp_sync: requires logging");
 		return (EINVAL);
 	}
 
+	/*
+	 * We try and write the buffers in page order so that the underlying
+	 * filesystem doesn't have to seek and can write contiguous blocks,
+	 * plus, we don't want to hold the region lock while we write the
+	 * buffers.  Get memory to hold the buffer pointers.  Get a good-size
+	 * block, too, because we realloc while holding the region lock if we
+	 * run out.
+	 */
+	if ((bharray =
+	    (BH **)__db_malloc((nalloc = 1024) * sizeof(BH *))) == NULL)
+		return (ENOMEM);
+
 	LOCKREGION(dbmp);
 
 	/*
-	 * If the application is asking about a previous call, and we haven't
-	 * found any buffers that the application holding the pin couldn't
-	 * write, return yes or no based on the current count.  Note, if the
-	 * application is asking about a LSN *smaller* than one we've already
-	 * handled, then we return based on the count for that LSN.
+	 * If the application is asking about a previous call to memp_sync(),
+	 * and we haven't found any buffers that the application holding the
+	 * pin couldn't write, return yes or no based on the current count.
+	 * Note, if the application is asking about a LSN *smaller* than one
+	 * we've already handled or are currently handling, then we return a
+	 * result based on the count for the larger LSN.
 	 */
 	mp = dbmp->mp;
 	if (!F_ISSET(mp, MP_LSN_RETRY) && log_compare(lsnp, &mp->lsn) <= 0) {
@@ -61,9 +77,7 @@ memp_sync(dbmp, lsnp)
 			ret = 0;
 		} else
 			ret = DB_INCOMPLETE;
-
-		UNLOCKREGION(dbmp);
-		return (ret);
+		goto done;
 	}
 
 	/* Else, it's a new checkpoint. */
@@ -74,7 +88,7 @@ memp_sync(dbmp, lsnp)
 	 * for which we were already doing a checkpoint.  (BTW, I don't expect
 	 * to see multiple LSN's from the same or multiple processes, but You
 	 * Just Never Know.  Responding as if they all called with the largest
-	 * of the LSNs specified makes everything work.
+	 * of the LSNs specified makes everything work.)
 	 *
 	 * We don't currently use the LSN we save.  We could potentially save
 	 * the last-written LSN in each buffer header and use it to determine
@@ -93,64 +107,127 @@ memp_sync(dbmp, lsnp)
 
 	/*
 	 * Walk the list of buffers and mark all dirty buffers to be written
-	 * and all pinned buffers to be potentially written.  We do this in
-	 * single fell swoop while holding the region locked so that processes
-	 * can't make new buffers dirty, causing us to never finish.  Since
-	 * the application may have restarted the sync, clear any BH_WRITE
-	 * flags that appear to be left over.
+	 * and all pinned buffers to be potentially written (we can't know if
+	 * we'll need to write them until the holding process returns them to
+	 * the cache).  We do this in one pass while holding the region locked
+	 * so that processes can't make new buffers dirty, causing us to never
+	 * finish.  Since the application may have restarted the sync, clear
+	 * any BH_WRITE flags that appear to be left over from previous calls.
+	 *
+	 * Keep a count of the total number of buffers we need to write in
+	 * MPOOL->lsn_cnt, and for each file, in MPOOLFILE->lsn_count.
 	 */
-	can_write = lsn_cnt = 0;
-	for (lsn_cnt = 0, bhp = SH_TAILQ_FIRST(&mp->bhq, __bh);
+	ar_cnt = 0;
+	for (bhp = SH_TAILQ_FIRST(&mp->bhq, __bh);
 	    bhp != NULL; bhp = SH_TAILQ_NEXT(bhp, q, __bh))
 		if (F_ISSET(bhp, BH_DIRTY) || bhp->ref != 0) {
 			F_SET(bhp, BH_WRITE);
 
-			if (bhp->ref == 0)
-				can_write = 1;
+			++mp->lsn_cnt;
 
-			mfp = ADDR(dbmp, bhp->mf_offset);
+			mfp = R_ADDR(dbmp, bhp->mf_offset);
 			++mfp->lsn_cnt;
 
-			++lsn_cnt;
+			/*
+			 * If the buffer isn't in use, we should be able to
+			 * write it immediately, so save a reference to it.
+			 */
+			if (bhp->ref == 0) {
+				if (ar_cnt == nalloc) {
+					nalloc *= 2;
+					if ((bharray =
+					    (BH **)__db_realloc(bharray,
+					    nalloc * sizeof(BH *))) == NULL) {
+						ret = ENOMEM;
+						goto err;
+					}
+				}
+				bharray[ar_cnt++] = bhp;
+			}
 		} else
 			F_CLR(bhp, BH_WRITE);
 
-	mp->lsn_cnt = lsn_cnt;
-
-	/* If there no buffers we can write, we're done. */
-	if (!can_write) {
-		UNLOCKREGION(dbmp);
-		return (mp->lsn_cnt ? DB_INCOMPLETE : 0);
+	/* If there no buffers we can write immediately, we're done. */
+	if (ar_cnt == 0) {
+		ret = mp->lsn_cnt ? DB_INCOMPLETE : 0;
+		goto done;
 	}
 
-	/*
-	 * Write any buffers that we can.  Restart the walk after each write,
-	 * __memp_pgwrite() discards and reacquires the region lock during I/O.
-	 */
-retry:	for (bhp = SH_TAILQ_FIRST(&mp->bhq, __bh);
-	    bhp != NULL; bhp = SH_TAILQ_NEXT(bhp, q, __bh)) {
-		/* Ignore pinned or locked buffers. */
-		if (!F_ISSET(bhp, BH_WRITE) ||
-		    bhp->ref != 0 || F_ISSET(bhp, BH_LOCKED))
-			continue;
+	/* Lock down the buffers and their contents. */
+	for (cnt = 0; cnt < ar_cnt; ++cnt)
+		++bharray[cnt]->ref;
 
-		mfp = ADDR(dbmp, bhp->mf_offset);
-		if ((ret =
-		    __memp_bhwrite(dbmp, mfp, bhp, &restart, &wrote)) != 0)
-			goto err;
-		if (wrote) {
-			if (restart)
-				goto retry;
+	UNLOCKREGION(dbmp);
+
+	/* Sort the buffers we're going to write. */
+	qsort(bharray, ar_cnt, sizeof(BH *), __bhcmp);
+
+	LOCKREGION(dbmp);
+
+	/* Walk the array, writing buffers. */
+	for (next = 0; next < ar_cnt; ++next) {
+		/*
+		 * It's possible for a thread to have gotten the buffer since
+		 * we listed it for writing.  If the reference count is still
+		 * 1, we're the only ones using the buffer, go ahead and write.
+		 * If it's >1, then skip the buffer and assume that it will be
+		 * written when it's returned to the cache.
+		 */
+		if (bharray[next]->ref > 1) {
+			--bharray[next]->ref;
 			continue;
 		}
-		__db_err(dbenv, "%s: unable to flush page: %lu",
-		    ADDR(dbmp, mfp->path_off), (u_long)bhp->pgno);
-		ret = EPERM;
-		goto err;
+
+		/* Write the buffer. */
+		mfp = R_ADDR(dbmp, bharray[next]->mf_offset);
+		ret =
+		    __memp_bhwrite(dbmp, mfp, bharray[next], &notused, &wrote);
+
+		/* Release the buffer. */
+		--bharray[next]->ref;
+
+		/* If there's an error, release the rest of the buffers. */
+		if (ret != 0 || !wrote) {
+			while (++next < ar_cnt)
+				--bharray[next]->ref;
+
+			if (ret != 0)
+				goto err;
+
+			/*
+			 * Any process syncing the shared memory buffer pool
+			 * had better be able to write to any underlying file.
+			 * Be understanding, but firm, on this point.
+			 */
+			if (!wrote) {
+				__db_err(dbenv, "%s: unable to flush page: %lu",
+				    R_ADDR(dbmp, mfp->path_off),
+				    (u_long)bharray[next]->pgno);
+				ret = EPERM;
+				goto err;
+			}
+		}
 	}
 	ret = mp->lsn_cnt ? DB_INCOMPLETE : 0;
 
-err:	UNLOCKREGION(dbmp);
+done:
+	if (0) {
+err:		/*
+		 * On error, clear:
+		 *	MPOOL->lsn_cnt (the total sync count)
+		 *	MPOOLFILE->lsn_cnt (the per-file sync count)
+		 *	BH_WRITE flag (the scheduled for writing flag)
+		 */
+		mp->lsn_cnt = 0;
+		for (mfp = SH_TAILQ_FIRST(&dbmp->mp->mpfq, __mpoolfile);
+		    mfp != NULL; mfp = SH_TAILQ_NEXT(mfp, q, __mpoolfile))
+			mfp->lsn_cnt = 0;
+		for (bhp = SH_TAILQ_FIRST(&mp->bhq, __bh);
+		    bhp != NULL; bhp = SH_TAILQ_NEXT(bhp, q, __bh))
+			F_CLR(bhp, BH_WRITE);
+	}
+	UNLOCKREGION(dbmp);
+	__db_free(bharray);
 	return (ret);
 }
 
@@ -162,10 +239,10 @@ int
 memp_fsync(dbmfp)
 	DB_MPOOLFILE *dbmfp;
 {
-	BH *bhp;
+	BH *bhp, **bharray;
 	DB_MPOOL *dbmp;
 	size_t mf_offset;
-	int pincnt, restart, ret, wrote;
+	int ar_cnt, cnt, nalloc, next, pincnt, notused, ret, wrote;
 
 	/*
 	 * If this handle doesn't have a file descriptor that's open for
@@ -175,35 +252,205 @@ memp_fsync(dbmfp)
 	if (F_ISSET(dbmfp, MP_READONLY | MP_PATH_TEMP))
 		return (0);
 
-	dbmp = dbmfp->dbmp;
 	ret = 0;
+	dbmp = dbmfp->dbmp;
+	mf_offset = R_OFFSET(dbmp, dbmfp->mfp);
 
-	mf_offset = OFFSET(dbmp, dbmfp->mfp);
+	/*
+	 * We try and write the buffers in page order so that the underlying
+	 * filesystem doesn't have to seek and can write contiguous blocks,
+	 * plus, we don't want to hold the region lock while we write the
+	 * buffers.  Get memory to hold the buffer pointers.  Get a good-size
+	 * block, too, because we realloc while holding the region lock if we
+	 * run out.
+	 */
+	nalloc = 1024;
+	if ((bharray =
+	    (BH **)__db_malloc((size_t)nalloc * sizeof(BH *))) == NULL)
+		return (ENOMEM);
 
 	LOCKREGION(dbmp);
 
 	/*
-	 * Walk the list of buffer headers for the MPOOLFILE, and write out any
-	 * dirty buffers that we can.
+	 * Walk the LRU list of buffer headers, and get a list of buffers to
+	 * write for this MPOOLFILE.
 	 */
-retry:	pincnt = 0;
+	ar_cnt = pincnt = 0;
 	for (bhp = SH_TAILQ_FIRST(&dbmp->mp->bhq, __bh);
-	    bhp != NULL; bhp = SH_TAILQ_NEXT(bhp, q, __bh))
-		if (F_ISSET(bhp, BH_DIRTY) && bhp->mf_offset == mf_offset) {
-			if (bhp->ref != 0 || F_ISSET(bhp, BH_LOCKED)) {
-				++pincnt;
-				continue;
-			}
-			if ((ret =
-			    __memp_pgwrite(dbmfp, bhp, &restart, &wrote)) != 0)
+	    bhp != NULL; bhp = SH_TAILQ_NEXT(bhp, q, __bh)) {
+		if (!F_ISSET(bhp, BH_DIRTY) || bhp->mf_offset != mf_offset)
+			continue;
+		if (bhp->ref != 0 || F_ISSET(bhp, BH_LOCKED)) {
+			++pincnt;
+			continue;
+		}
+
+		if (ar_cnt == nalloc) {
+			nalloc *= 2;
+			if ((bharray = (BH **)__db_realloc(bharray,
+			    nalloc * sizeof(BH *))) == NULL) {
+				ret = ENOMEM;
 				goto err;
-			if (!wrote)
-				++pincnt;
-			if (restart)
-				goto retry;
+			}
+		}
+
+		bharray[ar_cnt++] = bhp;
+	}
+
+	/* Lock down the buffers and their contents. */
+	for (cnt = 0; cnt < ar_cnt; ++cnt)
+		++bharray[cnt]->ref;
+
+	UNLOCKREGION(dbmp);
+
+	/* Sort the buffers we're going to write. */
+	qsort(bharray, ar_cnt, sizeof(BH *), __bhcmp);
+
+	LOCKREGION(dbmp);
+
+	/* Walk the array, writing buffers. */
+	for (next = 0; next < ar_cnt; ++next) {
+		/*
+		 * It's possible for a thread to have gotten the buffer since
+		 * we listed it for writing.  If the reference count is still
+		 * 1, we're the only ones using the buffer, go ahead and write.
+		 * If it's >1, then skip the buffer and assume that it will be
+		 * written when it's returned to the cache.
+		 */
+		if (bharray[next]->ref > 1) {
+			++pincnt;
+
+			--bharray[next]->ref;
+			continue;
 		}
 
+		/* Write the buffer. */
+		ret = __memp_pgwrite(dbmfp, bharray[next], &notused, &wrote);
+
+		/* Release the buffer. */
+		--bharray[next]->ref;
+
+		/* If there's an error, release the rest of the buffers. */
+		if (ret != 0) {
+			while (++next < ar_cnt)
+				--bharray[next]->ref;
+			goto err;
+		}
+		if (!wrote)
+			++pincnt;
+	}
+
+err:	UNLOCKREGION(dbmp);
+
+	__db_free(bharray);
+
+	/*
+	 * Sync the underlying file as the last thing we do, so that the OS
+	 * has maximal opportunity to flush buffers before we request it.
+	 *
+	 * XXX:
+	 * Don't lock the region around the sync, fsync(2) has no atomicity
+	 * issues.
+	 */
+	if (ret == 0)
+		return (pincnt == 0 ? __db_fsync(dbmfp->fd) : DB_INCOMPLETE);
+	return (ret);
+
+}
+
+/*
+ * memp_trickle --
+ *	Keep a specified percentage of the buffers clean.
+ */
+int
+memp_trickle(dbmp, pct, nwrotep)
+	DB_MPOOL *dbmp;
+	int pct, *nwrotep;
+{
+	BH *bhp;
+	MPOOL *mp;
+	MPOOLFILE *mfp;
+	u_long total;
+	int notused, ret, wrote;
+
+	mp = dbmp->mp;
+	if (nwrotep != NULL)
+		*nwrotep = 0;
+
+	if (pct < 1 || pct > 100)
+		return (EINVAL);
+
+	LOCKREGION(dbmp);
+
+	/*
+	 * If there are sufficient clean buffers, or no buffers or no dirty
+	 * buffers, we're done.
+	 *
+	 * XXX
+	 * Using st_page_clean and st_page_dirty is our only choice at the
+	 * moment, but it's not as correct as we might like in the presence
+	 * of pools with more than one buffer size, as a free 512-byte buffer
+	 * isn't the same as a free 8K buffer.
+	 */
+loop:	total = mp->stat.st_page_clean + mp->stat.st_page_dirty;
+	if (total == 0 || mp->stat.st_page_dirty == 0 ||
+	    (mp->stat.st_page_clean * 100) / total >= (u_long)pct) {
+		UNLOCKREGION(dbmp);
+		return (0);
+	}
+
+	/* Loop until we write a buffer. */
+	for (bhp = SH_TAILQ_FIRST(&mp->bhq, __bh);
+	    bhp != NULL; bhp = SH_TAILQ_NEXT(bhp, q, __bh)) {
+		if (bhp->ref != 0 ||
+		    !F_ISSET(bhp, BH_DIRTY) || F_ISSET(bhp, BH_LOCKED))
+			continue;
+
+		mfp = R_ADDR(dbmp, bhp->mf_offset);
+		if ((ret =
+		    __memp_bhwrite(dbmp, mfp, bhp, &notused, &wrote)) != 0)
+			goto err;
+
+		/*
+		 * Any process syncing the shared memory buffer pool
+		 * had better be able to write to any underlying file.
+		 * Be understanding, but firm, on this point.
+		 */
+		if (!wrote) {
+			__db_err(dbmp->dbenv, "%s: unable to flush page: %lu",
+			    R_ADDR(dbmp, mfp->path_off), (u_long)bhp->pgno);
+			ret = EPERM;
+			goto err;
+		}
+
+		++mp->stat.st_page_trickle;
+		if (nwrotep != NULL)
+			++*nwrotep;
+		goto loop;
+	}
+
+	/* No more buffers to write. */
+	return (0);
+
 err:	UNLOCKREGION(dbmp);
+	return (ret);
+}
+
+static int
+__bhcmp(p1, p2)
+	const void *p1, *p2;
+{
+	BH *bhp1, *bhp2;
+
+	bhp1 = *(BH **)p1;
+	bhp2 = *(BH **)p2;
+
+	/* Sort by file (shared memory pool offset). */
+	if (bhp1->mf_offset < bhp2->mf_offset)
+		return (-1);
+	if (bhp1->mf_offset > bhp2->mf_offset)
+		return (1);
 
-	return (ret == 0 ? (pincnt ? DB_INCOMPLETE : 0) : ret);
+	/* Sort by page in file. */
+	return (bhp1->pgno < bhp2->pgno ? -1 : 1);
 }