diff -urN gc-7.2alpha6.orig/alloc.c gc-7.2alpha6/alloc.c
--- gc-7.2alpha6.orig/alloc.c	2011-06-01 00:27:11.000000000 +0900
+++ gc-7.2alpha6/alloc.c	2012-05-08 01:22:13.000000000 +0900
@@ -121,6 +121,7 @@
 #endif
 
 word GC_free_space_divisor = GC_FREE_SPACE_DIVISOR;
+word GC_free_space_numerator = 1;
 
 GC_INNER int GC_CALLBACK GC_never_stop_func(void)
 {
@@ -229,9 +230,9 @@
     scan_size = 2 * GC_composite_in_use + GC_atomic_in_use / 4
 		+ total_root_size;
     if (GC_incremental) {
-        return scan_size / (2 * GC_free_space_divisor);
+        return scan_size * GC_free_space_numerator / (2 * GC_free_space_divisor);
     } else {
-        return scan_size / GC_free_space_divisor;
+        return scan_size * GC_free_space_numerator / (2 * GC_free_space_divisor);
     }
 }
 
@@ -597,6 +598,7 @@
         GET_TIME(start_time);
 #   endif
 
+	GC_timerstart();
     STOP_WORLD();
 #   ifdef THREAD_LOCAL_ALLOC
       GC_world_stopped = TRUE;
@@ -629,6 +631,7 @@
               GC_world_stopped = FALSE;
 #           endif
 	            START_WORLD();
+				GC_timerstop();
 	            return(FALSE);
 	    }
 	    if (GC_mark_some((ptr_t)(&dummy))) break;
@@ -651,6 +654,7 @@
       GC_world_stopped = FALSE;
 #   endif
     START_WORLD();
+    GC_timerstop();
 #   ifndef SMALL_CONFIG
     if (GC_print_stats) {
         unsigned long time_diff;
@@ -796,6 +800,7 @@
         /* FIXME: Add more checks.				*/
         GC_check_tls();
 #   endif
+	GC_timerstart();
 
 #   ifndef SMALL_CONFIG
     if (GC_print_stats)
@@ -923,6 +928,7 @@
 	              MS_TIME_DIFF(done_time,finalize_time));
     }
 #   endif
+    GC_timerstop();
 }
 
 /* If stop_func == 0 then GC_default_stop_func is used instead.         */
@@ -1172,6 +1178,9 @@
          GC_heapsize + expansion_slop - 2*MAXHINCR*HBLKSIZE;
         if (GC_collect_at_heapsize < GC_heapsize /* wrapped */)
          GC_collect_at_heapsize = (word)(-1);
+#if defined(VISUAL)
+    SendHeapSize();
+#endif
     return(TRUE);
 }
 
@@ -1281,6 +1290,21 @@
     GC_bool retry = FALSE;
     
     if (gran == 0) return(0);
+#if defined(_MSC_VER)
+    {
+#include <signal.h>
+        extern int recv_intr;
+        if ( recv_intr ) {
+            if ( recv_intr == 1 ) {
+                recv_intr = 0;
+                int_handler();
+            } else {
+                recv_intr = 0;
+                ox_usr1_handler(0);
+            }
+        }
+    }
+#endif
 
     while (*flh == 0) {
       ENTER_GC();
diff -urN gc-7.2alpha6.orig/misc.c gc-7.2alpha6/misc.c
--- gc-7.2alpha6.orig/misc.c	2011-06-01 00:27:11.000000000 +0900
+++ gc-7.2alpha6/misc.c	2012-05-08 01:17:58.000000000 +0900
@@ -141,6 +141,93 @@
 GC_INNER long GC_large_alloc_warn_interval = GC_LARGE_ALLOC_WARN_INTERVAL;
                         /* Interval between unsuppressed warnings.      */
 
+#include <time.h>
+
+#if defined(_MSC_VER)
+#include <windows.h>
+
+static double get_clock()
+{
+	static int initialized = 0;
+	static int is_winnt = 0;
+	static HANDLE curproc;
+
+	if ( !initialized ) {
+		OSVERSIONINFO vinfo;
+
+		curproc = GetCurrentProcess();		
+		vinfo.dwOSVersionInfoSize = sizeof(vinfo);
+		GetVersionEx(&vinfo);
+		if ( vinfo.dwPlatformId == VER_PLATFORM_WIN32_NT )
+			is_winnt = 1;
+		else
+			is_winnt = 0;
+	}
+	if ( is_winnt ) {
+		FILETIME c,e,k,u;
+
+		GetProcessTimes(curproc,&c,&e,&k,&u);
+		return ((double)k.dwLowDateTime+(double)u.dwLowDateTime
+			+4294967296.0*((double)k.dwHighDateTime+(double)u.dwHighDateTime))/10000000.0;
+	} else
+//		return (double)clock()/(double)CLOCKS_PER_SEC;
+		return ((double)GetTickCount())/1000.0;
+}
+
+#elif defined(THINK_C) || defined(__MWERKS__) || defined(MSWIN32)
+
+static double get_clock()
+{
+	clock_t c;
+
+	c = clock();
+	return (double)c/(double)CLOCKS_PER_SEC;
+}
+
+#elif defined(_PA_RISC1_1) || defined(__svr4__) || defined(__CYGWIN__)
+
+#include <sys/times.h>
+#include <limits.h>
+
+static double get_clock()
+{
+	struct tms buf;
+
+	times(&buf);
+	return (double)(buf.tms_utime+buf.tms_stime)/(double)CLK_TCK;
+}
+
+#else
+
+#include <sys/time.h>
+#include <sys/resource.h>
+
+static double get_clock()
+{
+	int tv_sec,tv_usec;
+	struct rusage ru;
+
+	getrusage(RUSAGE_SELF,&ru);
+	tv_sec = ru.ru_utime.tv_sec + ru.ru_stime.tv_sec;
+	tv_usec = ru.ru_utime.tv_usec + ru.ru_stime.tv_usec;
+	return (double)tv_sec+(double)tv_usec/(double)1000000;
+}
+#endif
+
+static double gctime, gcstart;
+
+void GC_timerstart() {
+	gcstart = get_clock();
+}
+
+void GC_timerstop() {
+	gctime += get_clock() - gcstart;
+}
+
+double GC_get_gctime() {
+	return gctime;
+}
+
 /*ARGSUSED*/
 STATIC void * GC_CALLBACK GC_default_oom_fn(size_t bytes_requested)
 {
diff -urN gc-7.2alpha6.orig/reclaim.c gc-7.2alpha6/reclaim.c
--- gc-7.2alpha6.orig/reclaim.c	2011-06-01 00:27:11.000000000 +0900
+++ gc-7.2alpha6/reclaim.c	2012-05-08 01:25:00.000000000 +0900
@@ -590,6 +590,7 @@
 
       if (GC_print_stats == VERBOSE)
         GET_TIME(start_time);
+      GC_timerstart();
 #   endif
 
     for (kind = 0; kind < GC_n_kinds; kind++) {
@@ -614,6 +615,7 @@
         }
     }
 #   ifndef SMALL_CONFIG
+      GC_timerstop();
       if (GC_print_stats == VERBOSE) {
         GET_TIME(done_time);
         GC_log_printf("Disposing of reclaim lists took %lu msecs\n",