diff --git a/BasiliskII/ChangeLog b/BasiliskII/ChangeLog
index 2c3c7904..ece429c1 100644
--- a/BasiliskII/ChangeLog
+++ b/BasiliskII/ChangeLog
@@ -6,6 +6,7 @@ V0.8 (snapshot) -
 	  [Jürgen Lachmann]
 	- AmigaOS/Unix/extfs_*.cpp: .finf helper file now stores complete
 	  FInfo/FXInfo, replaced get/set_finder_*() functions by get/set_finfo()
+	- Unix: improved timing of periodic threads
 	- include/macos_util.h: defines FOURCC() macro to make MacOS-like
 	  four-character-codes, replaced most instances of multi-character
 	  constants in the sources by this macro to avoid compiler warnings
diff --git a/BasiliskII/src/Unix/aclocal.m4 b/BasiliskII/src/Unix/aclocal.m4
index 6aeeeabb..3243d88f 100644
--- a/BasiliskII/src/Unix/aclocal.m4
+++ b/BasiliskII/src/Unix/aclocal.m4
@@ -1,7 +1,19 @@
+dnl aclocal.m4 generated automatically by aclocal 1.4
+
+dnl Copyright (C) 1994, 1995-8, 1999 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+dnl even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+dnl PARTICULAR PURPOSE.
+
 # Configure paths for GTK+
 # Owen Taylor     97-11-3
 
-dnl AM_PATH_GTK([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
+dnl AM_PATH_GTK([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND [, MODULES]]]])
 dnl Test for GTK, and define GTK_CFLAGS and GTK_LIBS
 dnl
 AC_DEFUN(AM_PATH_GTK,
@@ -15,6 +27,15 @@ AC_ARG_WITH(gtk-exec-prefix,[  --with-gtk-exec-prefix=PFX Exec prefix where GTK
 AC_ARG_ENABLE(gtktest, [  --disable-gtktest       Do not try to compile and run a test GTK program],
 		    , enable_gtktest=yes)
 
+  for module in . $4
+  do
+      case "$module" in
+         gthread) 
+             gtk_config_args="$gtk_config_args gthread"
+         ;;
+      esac
+  done
+
   if test x$gtk_config_exec_prefix != x ; then
      gtk_config_args="$gtk_config_args --exec-prefix=$gtk_config_exec_prefix"
      if test x${GTK_CONFIG+set} != xset ; then
@@ -47,7 +68,7 @@ AC_ARG_ENABLE(gtktest, [  --disable-gtktest       Do not try to compile and run
       ac_save_CFLAGS="$CFLAGS"
       ac_save_LIBS="$LIBS"
       CFLAGS="$CFLAGS $GTK_CFLAGS"
-      LIBS="$LIBS $GTK_LIBS"
+      LIBS="$GTK_LIBS $LIBS"
 dnl
 dnl Now check if the installed GTK is sufficiently new. (Also sanity
 dnl checks the results of gtk-config to some extent
@@ -56,15 +77,19 @@ dnl
       AC_TRY_RUN([
 #include <gtk/gtk.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 int 
 main ()
 {
   int major, minor, micro;
+  char *tmp_version;
 
   system ("touch conf.gtktest");
 
-  if (sscanf("$min_gtk_version", "%d.%d.%d", &major, &minor, &micro) != 3) {
+  /* HP/UX 9 (%@#!) writes to sscanf strings */
+  tmp_version = g_strdup("$min_gtk_version");
+  if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
      printf("%s, bad version string\n", "$min_gtk_version");
      exit(1);
    }
@@ -85,6 +110,17 @@ main ()
       printf("*** to point to the correct copy of gtk-config, and remove the file config.cache\n");
       printf("*** before re-running configure\n");
     } 
+#if defined (GTK_MAJOR_VERSION) && defined (GTK_MINOR_VERSION) && defined (GTK_MICRO_VERSION)
+  else if ((gtk_major_version != GTK_MAJOR_VERSION) ||
+	   (gtk_minor_version != GTK_MINOR_VERSION) ||
+           (gtk_micro_version != GTK_MICRO_VERSION))
+    {
+      printf("*** GTK+ header files (version %d.%d.%d) do not match\n",
+	     GTK_MAJOR_VERSION, GTK_MINOR_VERSION, GTK_MICRO_VERSION);
+      printf("*** library (version %d.%d.%d)\n",
+	     gtk_major_version, gtk_minor_version, gtk_micro_version);
+    }
+#endif /* defined (GTK_MAJOR_VERSION) ... */
   else
     {
       if ((gtk_major_version > major) ||
@@ -169,7 +205,6 @@ main ()
   rm -f conf.gtktest
 ])
 
-
 # Configure paths for ESD
 # Manish Singh    98-9-30
 # stolen back from Frank Belew
@@ -334,3 +369,4 @@ int main ()
   AC_SUBST(ESD_LIBS)
   rm -f conf.esdtest
 ])
+
diff --git a/BasiliskII/src/Unix/config.h.in b/BasiliskII/src/Unix/config.h.in
index 350f1ca4..3c24d273 100644
--- a/BasiliskII/src/Unix/config.h.in
+++ b/BasiliskII/src/Unix/config.h.in
@@ -73,9 +73,6 @@
 /* Define if you have the clock_gettime function.  */
 #undef HAVE_CLOCK_GETTIME
 
-/* Define if you have the nanosleep function.  */
-#undef HAVE_NANOSLEEP
-
 /* Define if you have the pthread_cancel function.  */
 #undef HAVE_PTHREAD_CANCEL
 
diff --git a/BasiliskII/src/Unix/configure b/BasiliskII/src/Unix/configure
index c468461f..545c7a0e 100755
--- a/BasiliskII/src/Unix/configure
+++ b/BasiliskII/src/Unix/configure
@@ -2681,6 +2681,15 @@ else
 fi
 
 
+  for module in . 
+  do
+      case "$module" in
+         gthread) 
+             gtk_config_args="$gtk_config_args gthread"
+         ;;
+      esac
+  done
+
   if test x$gtk_config_exec_prefix != x ; then
      gtk_config_args="$gtk_config_args --exec-prefix=$gtk_config_exec_prefix"
      if test x${GTK_CONFIG+set} != xset ; then
@@ -2697,7 +2706,7 @@ fi
   # Extract the first word of "gtk-config", so it can be a program name with args.
 set dummy gtk-config; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:2701: checking for $ac_word" >&5
+echo "configure:2710: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_GTK_CONFIG'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2732,7 +2741,7 @@ fi
 
   min_gtk_version=1.2.0
   echo $ac_n "checking for GTK - version >= $min_gtk_version""... $ac_c" 1>&6
-echo "configure:2736: checking for GTK - version >= $min_gtk_version" >&5
+echo "configure:2745: checking for GTK - version >= $min_gtk_version" >&5
   no_gtk=""
   if test "$GTK_CONFIG" = "no" ; then
     no_gtk=yes
@@ -2749,26 +2758,30 @@ echo "configure:2736: checking for GTK - version >= $min_gtk_version" >&5
       ac_save_CFLAGS="$CFLAGS"
       ac_save_LIBS="$LIBS"
       CFLAGS="$CFLAGS $GTK_CFLAGS"
-      LIBS="$LIBS $GTK_LIBS"
+      LIBS="$GTK_LIBS $LIBS"
       rm -f conf.gtktest
       if test "$cross_compiling" = yes; then
   echo $ac_n "cross compiling; assumed OK... $ac_c"
 else
   cat > conftest.$ac_ext <<EOF
-#line 2759 "configure"
+#line 2768 "configure"
 #include "confdefs.h"
 
 #include <gtk/gtk.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 int 
 main ()
 {
   int major, minor, micro;
+  char *tmp_version;
 
   system ("touch conf.gtktest");
 
-  if (sscanf("$min_gtk_version", "%d.%d.%d", &major, &minor, &micro) != 3) {
+  /* HP/UX 9 (%@#!) writes to sscanf strings */
+  tmp_version = g_strdup("$min_gtk_version");
+  if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
      printf("%s, bad version string\n", "$min_gtk_version");
      exit(1);
    }
@@ -2789,6 +2802,17 @@ main ()
       printf("*** to point to the correct copy of gtk-config, and remove the file config.cache\n");
       printf("*** before re-running configure\n");
     } 
+#if defined (GTK_MAJOR_VERSION) && defined (GTK_MINOR_VERSION) && defined (GTK_MICRO_VERSION)
+  else if ((gtk_major_version != GTK_MAJOR_VERSION) ||
+	   (gtk_minor_version != GTK_MINOR_VERSION) ||
+           (gtk_micro_version != GTK_MICRO_VERSION))
+    {
+      printf("*** GTK+ header files (version %d.%d.%d) do not match\n",
+	     GTK_MAJOR_VERSION, GTK_MINOR_VERSION, GTK_MICRO_VERSION);
+      printf("*** library (version %d.%d.%d)\n",
+	     gtk_major_version, gtk_minor_version, gtk_micro_version);
+    }
+#endif /* defined (GTK_MAJOR_VERSION) ... */
   else
     {
       if ((gtk_major_version > major) ||
@@ -2818,7 +2842,7 @@ main ()
 }
 
 EOF
-if { (eval echo configure:2822: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:2846: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   :
 else
@@ -2861,7 +2885,7 @@ EOF
           CFLAGS="$CFLAGS $GTK_CFLAGS"
           LIBS="$LIBS $GTK_LIBS"
           cat > conftest.$ac_ext <<EOF
-#line 2865 "configure"
+#line 2889 "configure"
 #include "confdefs.h"
 
 #include <gtk/gtk.h>
@@ -2871,7 +2895,7 @@ int main() {
  return ((gtk_major_version) || (gtk_minor_version) || (gtk_micro_version)); 
 ; return 0; }
 EOF
-if { (eval echo configure:2875: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2899: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
    echo "*** The test program compiled, but did not run. This usually means"
           echo "*** that the run-time linker is not finding GTK or finding the wrong"
@@ -2956,7 +2980,7 @@ fi
   # Extract the first word of "esd-config", so it can be a program name with args.
 set dummy esd-config; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:2960: checking for $ac_word" >&5
+echo "configure:2984: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_ESD_CONFIG'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2991,7 +3015,7 @@ fi
 
   min_esd_version=0.2.8
   echo $ac_n "checking for ESD - version >= $min_esd_version""... $ac_c" 1>&6
-echo "configure:2995: checking for ESD - version >= $min_esd_version" >&5
+echo "configure:3019: checking for ESD - version >= $min_esd_version" >&5
   no_esd=""
   if test "$ESD_CONFIG" = "no" ; then
     no_esd=yes
@@ -3015,7 +3039,7 @@ echo "configure:2995: checking for ESD - version >= $min_esd_version" >&5
   echo $ac_n "cross compiling; assumed OK... $ac_c"
 else
   cat > conftest.$ac_ext <<EOF
-#line 3019 "configure"
+#line 3043 "configure"
 #include "confdefs.h"
 
 #include <stdio.h>
@@ -3073,7 +3097,7 @@ int main ()
 
 
 EOF
-if { (eval echo configure:3077: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:3101: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   :
 else
@@ -3115,7 +3139,7 @@ EOF
           CFLAGS="$CFLAGS $ESD_CFLAGS"
           LIBS="$LIBS $ESD_LIBS"
           cat > conftest.$ac_ext <<EOF
-#line 3119 "configure"
+#line 3143 "configure"
 #include "confdefs.h"
 
 #include <stdio.h>
@@ -3125,7 +3149,7 @@ int main() {
  return 0; 
 ; return 0; }
 EOF
-if { (eval echo configure:3129: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3153: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
    echo "*** The test program compiled, but did not run. This usually means"
           echo "*** that the run-time linker is not finding ESD or finding the wrong"
@@ -3164,12 +3188,12 @@ rm -f conftest*
 fi
 
 echo $ac_n "checking for ANSI C header files""... $ac_c" 1>&6
-echo "configure:3168: checking for ANSI C header files" >&5
+echo "configure:3192: checking for ANSI C header files" >&5
 if eval "test \"`echo '$''{'ac_cv_header_stdc'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3173 "configure"
+#line 3197 "configure"
 #include "confdefs.h"
 #include <stdlib.h>
 #include <stdarg.h>
@@ -3177,7 +3201,7 @@ else
 #include <float.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:3181: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:3205: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -3194,7 +3218,7 @@ rm -f conftest*
 if test $ac_cv_header_stdc = yes; then
   # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
 cat > conftest.$ac_ext <<EOF
-#line 3198 "configure"
+#line 3222 "configure"
 #include "confdefs.h"
 #include <string.h>
 EOF
@@ -3212,7 +3236,7 @@ fi
 if test $ac_cv_header_stdc = yes; then
   # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
 cat > conftest.$ac_ext <<EOF
-#line 3216 "configure"
+#line 3240 "configure"
 #include "confdefs.h"
 #include <stdlib.h>
 EOF
@@ -3233,7 +3257,7 @@ if test "$cross_compiling" = yes; then
   :
 else
   cat > conftest.$ac_ext <<EOF
-#line 3237 "configure"
+#line 3261 "configure"
 #include "confdefs.h"
 #include <ctype.h>
 #define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
@@ -3244,7 +3268,7 @@ if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) exit(2);
 exit (0); }
 
 EOF
-if { (eval echo configure:3248: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:3272: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   :
 else
@@ -3271,17 +3295,17 @@ for ac_hdr in unistd.h fcntl.h sys/time.h
 do
 ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
-echo "configure:3275: checking for $ac_hdr" >&5
+echo "configure:3299: checking for $ac_hdr" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3280 "configure"
+#line 3304 "configure"
 #include "confdefs.h"
 #include <$ac_hdr>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:3285: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:3309: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -3309,14 +3333,14 @@ done
 
 
 echo $ac_n "checking whether byte ordering is bigendian""... $ac_c" 1>&6
-echo "configure:3313: checking whether byte ordering is bigendian" >&5
+echo "configure:3337: checking whether byte ordering is bigendian" >&5
 if eval "test \"`echo '$''{'ac_cv_c_bigendian'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   ac_cv_c_bigendian=unknown
 # See if sys/param.h defines the BYTE_ORDER macro.
 cat > conftest.$ac_ext <<EOF
-#line 3320 "configure"
+#line 3344 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/param.h>
@@ -3327,11 +3351,11 @@ int main() {
 #endif
 ; return 0; }
 EOF
-if { (eval echo configure:3331: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3355: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   # It does; now see whether it defined to BIG_ENDIAN or not.
 cat > conftest.$ac_ext <<EOF
-#line 3335 "configure"
+#line 3359 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/param.h>
@@ -3342,7 +3366,7 @@ int main() {
 #endif
 ; return 0; }
 EOF
-if { (eval echo configure:3346: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3370: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_bigendian=yes
 else
@@ -3362,7 +3386,7 @@ if test "$cross_compiling" = yes; then
     { echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
 else
   cat > conftest.$ac_ext <<EOF
-#line 3366 "configure"
+#line 3390 "configure"
 #include "confdefs.h"
 main () {
   /* Are we little or big endian?  From Harbison&Steele.  */
@@ -3375,7 +3399,7 @@ main () {
   exit (u.c[sizeof (long) - 1] == 1);
 }
 EOF
-if { (eval echo configure:3379: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:3403: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_c_bigendian=no
 else
@@ -3399,12 +3423,12 @@ EOF
 fi
 
 echo $ac_n "checking for working const""... $ac_c" 1>&6
-echo "configure:3403: checking for working const" >&5
+echo "configure:3427: checking for working const" >&5
 if eval "test \"`echo '$''{'ac_cv_c_const'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3408 "configure"
+#line 3432 "configure"
 #include "confdefs.h"
 
 int main() {
@@ -3453,7 +3477,7 @@ ccp = (char const *const *) p;
 
 ; return 0; }
 EOF
-if { (eval echo configure:3457: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3481: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_const=yes
 else
@@ -3474,21 +3498,21 @@ EOF
 fi
 
 echo $ac_n "checking for inline""... $ac_c" 1>&6
-echo "configure:3478: checking for inline" >&5
+echo "configure:3502: checking for inline" >&5
 if eval "test \"`echo '$''{'ac_cv_c_inline'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   ac_cv_c_inline=no
 for ac_kw in inline __inline__ __inline; do
   cat > conftest.$ac_ext <<EOF
-#line 3485 "configure"
+#line 3509 "configure"
 #include "confdefs.h"
 
 int main() {
 } $ac_kw foo() {
 ; return 0; }
 EOF
-if { (eval echo configure:3492: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3516: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_inline=$ac_kw; break
 else
@@ -3514,7 +3538,7 @@ EOF
 esac
 
 echo $ac_n "checking size of short""... $ac_c" 1>&6
-echo "configure:3518: checking size of short" >&5
+echo "configure:3542: checking size of short" >&5
 if eval "test \"`echo '$''{'ac_cv_sizeof_short'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3522,7 +3546,7 @@ else
   ac_cv_sizeof_short=2
 else
   cat > conftest.$ac_ext <<EOF
-#line 3526 "configure"
+#line 3550 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 main()
@@ -3533,7 +3557,7 @@ main()
   exit(0);
 }
 EOF
-if { (eval echo configure:3537: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:3561: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_sizeof_short=`cat conftestval`
 else
@@ -3553,7 +3577,7 @@ EOF
 
 
 echo $ac_n "checking size of int""... $ac_c" 1>&6
-echo "configure:3557: checking size of int" >&5
+echo "configure:3581: checking size of int" >&5
 if eval "test \"`echo '$''{'ac_cv_sizeof_int'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3561,7 +3585,7 @@ else
   ac_cv_sizeof_int=4
 else
   cat > conftest.$ac_ext <<EOF
-#line 3565 "configure"
+#line 3589 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 main()
@@ -3572,7 +3596,7 @@ main()
   exit(0);
 }
 EOF
-if { (eval echo configure:3576: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:3600: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_sizeof_int=`cat conftestval`
 else
@@ -3592,7 +3616,7 @@ EOF
 
 
 echo $ac_n "checking size of long""... $ac_c" 1>&6
-echo "configure:3596: checking size of long" >&5
+echo "configure:3620: checking size of long" >&5
 if eval "test \"`echo '$''{'ac_cv_sizeof_long'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3600,7 +3624,7 @@ else
   ac_cv_sizeof_long=4
 else
   cat > conftest.$ac_ext <<EOF
-#line 3604 "configure"
+#line 3628 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 main()
@@ -3611,7 +3635,7 @@ main()
   exit(0);
 }
 EOF
-if { (eval echo configure:3615: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:3639: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_sizeof_long=`cat conftestval`
 else
@@ -3631,7 +3655,7 @@ EOF
 
 
 echo $ac_n "checking size of long long""... $ac_c" 1>&6
-echo "configure:3635: checking size of long long" >&5
+echo "configure:3659: checking size of long long" >&5
 if eval "test \"`echo '$''{'ac_cv_sizeof_long_long'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3639,7 +3663,7 @@ else
   ac_cv_sizeof_long_long=8
 else
   cat > conftest.$ac_ext <<EOF
-#line 3643 "configure"
+#line 3667 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 main()
@@ -3650,7 +3674,7 @@ main()
   exit(0);
 }
 EOF
-if { (eval echo configure:3654: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:3678: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_sizeof_long_long=`cat conftestval`
 else
@@ -3670,12 +3694,12 @@ EOF
 
 
 echo $ac_n "checking for off_t""... $ac_c" 1>&6
-echo "configure:3674: checking for off_t" >&5
+echo "configure:3698: checking for off_t" >&5
 if eval "test \"`echo '$''{'ac_cv_type_off_t'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3679 "configure"
+#line 3703 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #if STDC_HEADERS
@@ -3703,12 +3727,12 @@ EOF
 fi
 
 echo $ac_n "checking for loff_t""... $ac_c" 1>&6
-echo "configure:3707: checking for loff_t" >&5
+echo "configure:3731: checking for loff_t" >&5
 if eval "test \"`echo '$''{'ac_cv_type_loff_t'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3712 "configure"
+#line 3736 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #if STDC_HEADERS
@@ -3736,12 +3760,12 @@ EOF
 fi
 
 echo $ac_n "checking for size_t""... $ac_c" 1>&6
-echo "configure:3740: checking for size_t" >&5
+echo "configure:3764: checking for size_t" >&5
 if eval "test \"`echo '$''{'ac_cv_type_size_t'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3745 "configure"
+#line 3769 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #if STDC_HEADERS
@@ -3769,12 +3793,12 @@ EOF
 fi
 
 echo $ac_n "checking whether time.h and sys/time.h may both be included""... $ac_c" 1>&6
-echo "configure:3773: checking whether time.h and sys/time.h may both be included" >&5
+echo "configure:3797: checking whether time.h and sys/time.h may both be included" >&5
 if eval "test \"`echo '$''{'ac_cv_header_time'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3778 "configure"
+#line 3802 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/time.h>
@@ -3783,7 +3807,7 @@ int main() {
 struct tm *tp;
 ; return 0; }
 EOF
-if { (eval echo configure:3787: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3811: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_header_time=yes
 else
@@ -3804,12 +3828,12 @@ EOF
 fi
 
 echo $ac_n "checking whether struct tm is in sys/time.h or time.h""... $ac_c" 1>&6
-echo "configure:3808: checking whether struct tm is in sys/time.h or time.h" >&5
+echo "configure:3832: checking whether struct tm is in sys/time.h or time.h" >&5
 if eval "test \"`echo '$''{'ac_cv_struct_tm'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3813 "configure"
+#line 3837 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <time.h>
@@ -3817,7 +3841,7 @@ int main() {
 struct tm *tp; tp->tm_sec;
 ; return 0; }
 EOF
-if { (eval echo configure:3821: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3845: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_struct_tm=time.h
 else
@@ -3841,12 +3865,12 @@ fi
 for ac_func in strdup cfmakeraw
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3845: checking for $ac_func" >&5
+echo "configure:3869: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3850 "configure"
+#line 3874 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3869,7 +3893,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3873: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3897: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3893,15 +3917,15 @@ else
 fi
 done
 
-for ac_func in nanosleep clock_gettime timer_create
+for ac_func in clock_gettime timer_create
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3900: checking for $ac_func" >&5
+echo "configure:3924: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3905 "configure"
+#line 3929 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3924,7 +3948,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3928: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3952: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3966,7 +3990,7 @@ if MACHINE=`uname -s 2>/dev/null`; then
     AUDIOSRC=audio_oss_esd.cpp
     DEFINES="$DEFINES -DBSD_COMP"
         echo $ac_n "checking for cam_open_btl in -lcam""... $ac_c" 1>&6
-echo "configure:3970: checking for cam_open_btl in -lcam" >&5
+echo "configure:3994: checking for cam_open_btl in -lcam" >&5
 ac_lib_var=`echo cam'_'cam_open_btl | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -3974,7 +3998,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lcam  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 3978 "configure"
+#line 4002 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -3985,7 +4009,7 @@ int main() {
 cam_open_btl()
 ; return 0; }
 EOF
-if { (eval echo configure:3989: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4013: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4011,17 +4035,17 @@ fi
     else
             ac_safe=`echo "/sys/cam/cam.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for /sys/cam/cam.h""... $ac_c" 1>&6
-echo "configure:4015: checking for /sys/cam/cam.h" >&5
+echo "configure:4039: checking for /sys/cam/cam.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4020 "configure"
+#line 4044 "configure"
 #include "confdefs.h"
 #include </sys/cam/cam.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:4025: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:4049: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -4056,7 +4080,7 @@ fi
   FreeBSD*)
     DEFINES="$DEFINES -DBSD_COMP"
         echo $ac_n "checking for scsi_open in -lscsi""... $ac_c" 1>&6
-echo "configure:4060: checking for scsi_open in -lscsi" >&5
+echo "configure:4084: checking for scsi_open in -lscsi" >&5
 ac_lib_var=`echo scsi'_'scsi_open | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4064,7 +4088,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lscsi  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4068 "configure"
+#line 4092 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -4075,7 +4099,7 @@ int main() {
 scsi_open()
 ; return 0; }
 EOF
-if { (eval echo configure:4079: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4103: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4101,17 +4125,17 @@ fi
     else
             ac_safe=`echo "scsi.h sys/scsiio.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for scsi.h sys/scsiio.h""... $ac_c" 1>&6
-echo "configure:4105: checking for scsi.h sys/scsiio.h" >&5
+echo "configure:4129: checking for scsi.h sys/scsiio.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4110 "configure"
+#line 4134 "configure"
 #include "confdefs.h"
 #include <scsi.h sys/scsiio.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:4115: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:4139: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -4164,7 +4188,7 @@ SYSSRCS="$SERIALSRC $ETHERSRC $SCSISRC $AUDIOSRC $SEMSRC $UISRCS $MONSRCS $EXTRA
 
 HAVE_GAS=no
 echo $ac_n "checking for GAS .p2align feature""... $ac_c" 1>&6
-echo "configure:4168: checking for GAS .p2align feature" >&5
+echo "configure:4192: checking for GAS .p2align feature" >&5
 cat >conftest.S << EOF
 	.text
 	.p2align 5
@@ -4174,9 +4198,9 @@ echo "$ac_t""$HAVE_GAS" 1>&6
 
 HAVE_GCC27=no
 echo $ac_n "checking for GCC 2.7 or higher""... $ac_c" 1>&6
-echo "configure:4178: checking for GCC 2.7 or higher" >&5
+echo "configure:4202: checking for GCC 2.7 or higher" >&5
 cat > conftest.$ac_ext <<EOF
-#line 4180 "configure"
+#line 4204 "configure"
 #include "confdefs.h"
 #if __GNUC__ - 1 > 1 || __GNUC_MINOR__ - 1 > 5
   yes
@@ -4215,7 +4239,7 @@ elif [ "x$HAVE_GCC27" = "xyes" -a "x$HAVE_SPARC" = "xyes" -a "x$HAVE_GAS" = "xye
     case "$MACHINE" in
   SunOS*)
     echo $ac_n "checking SPARC CPU architecture""... $ac_c" 1>&6
-echo "configure:4219: checking SPARC CPU architecture" >&5
+echo "configure:4243: checking SPARC CPU architecture" >&5
     SPARC_TYPE=`Solaris/which_sparc`
     echo "$ac_t""$SPARC_TYPE" 1>&6
     case "$SPARC_TYPE" in
diff --git a/BasiliskII/src/Unix/configure.in b/BasiliskII/src/Unix/configure.in
index f6017394..ee5a43c7 100644
--- a/BasiliskII/src/Unix/configure.in
+++ b/BasiliskII/src/Unix/configure.in
@@ -180,7 +180,7 @@ AC_STRUCT_TM
 
 dnl Checks for library functions.
 AC_CHECK_FUNCS(strdup cfmakeraw)
-AC_CHECK_FUNCS(nanosleep clock_gettime timer_create)
+AC_CHECK_FUNCS(clock_gettime timer_create)
 
 dnl Select system-dependant source files.
 SERIALSRC=serial_unix.cpp
diff --git a/BasiliskII/src/Unix/main_unix.cpp b/BasiliskII/src/Unix/main_unix.cpp
index 06d59178..89a96c6a 100644
--- a/BasiliskII/src/Unix/main_unix.cpp
+++ b/BasiliskII/src/Unix/main_unix.cpp
@@ -687,14 +687,8 @@ static void xpram_watchdog(void)
 static void *xpram_func(void *arg)
 {
 	while (!xpram_thread_cancel) {
-		for (int i=0; i<60 && !xpram_thread_cancel; i++) {
-#ifdef HAVE_NANOSLEEP
-			struct timespec req = {1, 0};
-			nanosleep(&req, NULL);
-#else
-			usleep(1000000);
-#endif
-		}
+		for (int i=0; i<60 && !xpram_thread_cancel; i++)
+			Delay_usec(1000000);
 		xpram_watchdog();
 	}
 	return NULL;
@@ -746,24 +740,77 @@ static void one_tick(...)
 #ifdef HAVE_PTHREADS
 static void *tick_func(void *arg)
 {
+	uint64 next = GetTicks_usec();
 	while (!tick_thread_cancel) {
-
-		// Wait
-#ifdef HAVE_NANOSLEEP
-		struct timespec req = {0, 16625000};
-		nanosleep(&req, NULL);
-#else
-		usleep(16625);
-#endif
-
-		// Action
 		one_tick();
+		next += 16625;
+		int64 delay = next - GetTicks_usec();
+		if (delay > 0)
+			Delay_usec(delay);
+		else if (delay < -16625)
+			next = GetTicks_usec();
 	}
 	return NULL;
 }
 #endif
 
 
+/*
+ *  Get current value of microsecond timer
+ */
+
+uint64 GetTicks_usec(void)
+{
+#ifdef HAVE_CLOCK_GETTIME
+	struct timespec t;
+	clock_gettime(CLOCK_REALTIME, &t);
+	return (uint64)t.tv_sec * 1000000 + t.tv_nsec / 1000;
+#else
+	struct timeval t;
+	gettimeofday(&t, NULL);
+	return (uint64)t.tv_sec * 1000000 + t.tv_usec;
+#endif
+}
+
+
+/*
+ *  Delay by specified number of microseconds (<1 second)
+ *  (adapted from SDL_Delay() source)
+ */
+
+void Delay_usec(uint32 usec)
+{
+	int was_error;
+#ifndef __linux__	// Non-Linux implementations need to calculate time left
+	uint64 then, now, elapsed;
+#endif
+	struct timeval tv;
+
+	// Set the timeout interval - Linux only needs to do this once
+#ifdef __linux__
+	tv.tv_sec = 0;
+	tv.tv_usec = usec;
+#else
+	then = GetTicks_usec();
+#endif
+	do {
+		errno = 0;
+#ifndef __linux__
+		/* Calculate the time interval left (in case of interrupt) */
+		now = GetTicks_usec();
+		elapsed = now - then;
+		then = now;
+		if (elapsed >= usec)
+			break;
+		usec -= elapsed;
+		tv.tv_sec = 0;
+		tv.tv_usec = usec;
+#endif
+		was_error = select(0, NULL, NULL, NULL, &tv);
+	} while (was_error && (errno == EINTR));
+}
+
+
 #if !EMULATED_68K
 /*
  *  Virtual 68k interrupt handler
diff --git a/BasiliskII/src/Unix/sysdeps.h b/BasiliskII/src/Unix/sysdeps.h
index b9863bab..9bea1c85 100644
--- a/BasiliskII/src/Unix/sysdeps.h
+++ b/BasiliskII/src/Unix/sysdeps.h
@@ -148,6 +148,10 @@ typedef uae_u32 uaecptr;
 # define CPU_CAN_ACCESS_UNALIGNED
 #endif
 
+/* Timing functions */
+extern uint64 GetTicks_usec(void);
+extern void Delay_usec(uint32 usec);
+
 /* UAE CPU defines */
 #ifdef WORDS_BIGENDIAN
 
diff --git a/BasiliskII/src/Unix/video_x.cpp b/BasiliskII/src/Unix/video_x.cpp
index 6fe78d99..c922bb09 100644
--- a/BasiliskII/src/Unix/video_x.cpp
+++ b/BasiliskII/src/Unix/video_x.cpp
@@ -1458,8 +1458,7 @@ static void update_display_static(void)
 						x1 = i << 3;
 						break;
 					}
-					p++;
-					p2++;
+					p++; p2++;
 				}
 			}
 			x2 = x1;
@@ -1469,8 +1468,7 @@ static void update_display_static(void)
 				p += bytes_per_row;
 				p2 += bytes_per_row;
 				for (i=(VideoMonitor.x>>3); i>(x2>>3); i--) {
-					p--;
-					p2--;
+					p--; p2--;
 					if (*p != *p2) {
 						x2 = i << 3;
 						break;
@@ -1492,13 +1490,12 @@ static void update_display_static(void)
 			for (j=y1; j<=y2; j++) {
 				p = &the_buffer[j * bytes_per_row];
 				p2 = &the_buffer_copy[j * bytes_per_row];
-				for (i=0; i<x1; i++) {
-					if (memcmp(p, p2, bytes_per_pixel)) {
-						x1 = i;
+				for (i=0; i<x1*bytes_per_pixel; i++) {
+					if (*p != *p2) {
+						x1 = i / bytes_per_pixel;
 						break;
 					}
-					p += bytes_per_pixel;
-					p2 += bytes_per_pixel;
+					p++; p2++;
 				}
 			}
 			x2 = x1;
@@ -1507,11 +1504,11 @@ static void update_display_static(void)
 				p2 = &the_buffer_copy[j * bytes_per_row];
 				p += bytes_per_row;
 				p2 += bytes_per_row;
-				for (i=VideoMonitor.x; i>x2; i--) {
-					p -= bytes_per_pixel;
-					p2 -= bytes_per_pixel;
-					if (memcmp(p, p2, bytes_per_pixel)) {
-						x2 = i;
+				for (i=VideoMonitor.x*bytes_per_pixel; i>x2*bytes_per_pixel; i--) {
+					p--;
+					p2--;
+					if (*p != *p2) {
+						x2 = i / bytes_per_pixel;
 						break;
 					}
 				}
@@ -1601,15 +1598,21 @@ void VideoRefresh(void)
 #ifdef HAVE_PTHREADS
 static void *redraw_func(void *arg)
 {
+uint64 start = GetTicks_usec();
+int64 ticks = 0;
+	uint64 next = GetTicks_usec();
 	while (!redraw_thread_cancel) {
-#ifdef HAVE_NANOSLEEP
-		struct timespec req = {0, 16666667};
-		nanosleep(&req, NULL);
-#else
-		usleep(16667);
-#endif
 		VideoRefresh();
+		next += 16667;
+		int64 delay = next - GetTicks_usec();
+		if (delay > 0)
+			Delay_usec(delay);
+		else if (delay < -16667)
+			next = GetTicks_usec();
+ticks++;
 	}
+uint64 end = GetTicks_usec();
+printf("%Ld ticks in %Ld usec = %Ld ticks/sec\n", ticks, end - start, (end - start) / ticks);
 	return NULL;
 }
 #endif