Imported version version 6.0alpha7.

	* README, README.Mac, README.OS2, README.QUICK, README.alpha,
	README.amiga, README.debugging, README.dj, README.hp, README.linux,
	README.rs6000, README.sgi, README.solaris2, README.uts,
	README.win32, SCoptions.amiga, backptr.h, barrett_diagram,
	dbg_mlc.h, gc.h, gc.man, gc_alloc.h, gc_cpp.h, gc_hdrs.h, gc_mark.h,
	gc_priv.h, gc_private.h, gc_typed.h, gcconfig.h,
	hpux_irix_threads.c, makefile.depend, nursery.c,
	solaris_threads.h, test.c, test_cpp.cc, weakpointer.h, cord/README,
	cord/SCOPTIONS.amiga, cord/SMakefile.amiga, cord/cord.h,
	cord/ec.h, cord/gc.h, cord/private/cord_pos.h, include/backptr.h,
	include/gc_copy_descr.h, include/gc_nursery.h: Remove obsolete/moved
	files.

From-SVN: r42379

1 files changed, 228 insertions, 152 deletions

diff --git a/boehm-gc/misc.c b/boehm-gc/misc.c
index 9edb945..8ece80d 100644
--- a/boehm-gc/misc.c
+++ b/boehm-gc/misc.c
@@ -15,16 +15,21 @@
 
 
 #include <stdio.h>
+#ifndef _WIN32_WCE
 #include <signal.h>
+#endif
 
 #define I_HIDE_POINTERS	/* To make GC_call_with_alloc_lock visible */
-#include "gc_priv.h"
+#include "private/gc_pmark.h"
 
 #ifdef SOLARIS_THREADS
 # include <sys/syscall.h>
 #endif
-#ifdef MSWIN32
+#if defined(MSWIN32) || defined(MSWINCE)
+# define WIN32_LEAN_AND_MEAN
+# define NOSERVICE
 # include <windows.h>
+# include <tchar.h>
 #endif
 
 # ifdef THREADS
@@ -40,15 +45,22 @@
 	  mutex_t GC_allocate_ml;	/* Implicitly initialized.	*/
 #	else
 #          ifdef WIN32_THREADS
-	      GC_API CRITICAL_SECTION GC_allocate_ml;
+#	      if defined(_DLL) || defined(GC_DLL)
+		 __declspec(dllexport) CRITICAL_SECTION GC_allocate_ml;
+#	      else
+		 CRITICAL_SECTION GC_allocate_ml;
+#	      endif
 #          else
-#             if defined(IRIX_THREADS) || defined(IRIX_JDK_THREADS) \
+#             if defined(IRIX_THREADS) \
 		 || (defined(LINUX_THREADS) && defined(USE_SPIN_LOCK))
 	        pthread_t GC_lock_holder = NO_THREAD;
 #	      else
 #	        if defined(HPUX_THREADS) \
 		   || defined(LINUX_THREADS) && !defined(USE_SPIN_LOCK)
 		  pthread_mutex_t GC_allocate_ml = PTHREAD_MUTEX_INITIALIZER;
+	          pthread_t GC_lock_holder = NO_THREAD;
+			/* Used only for assertions, and to prevent	 */
+			/* recursive reentry in the system call wrapper. */
 #		else 
 	          --> declare allocator lock here
 #		endif
@@ -69,22 +81,36 @@ GC_FAR struct _GC_arrays GC_arrays /* = { 0 } */;
 GC_bool GC_debugging_started = FALSE;
 	/* defined here so we don't have to load debug_malloc.o */
 
-void (*GC_check_heap)() = (void (*)())0;
+void (*GC_check_heap) GC_PROTO((void)) = (void (*) GC_PROTO((void)))0;
 
-void (*GC_start_call_back)() = (void (*)())0;
+void (*GC_start_call_back) GC_PROTO((void)) = (void (*) GC_PROTO((void)))0;
 
 ptr_t GC_stackbottom = 0;
 
+#ifdef IA64
+  ptr_t GC_register_stackbottom = 0;
+#endif
+
 GC_bool GC_dont_gc = 0;
 
+GC_bool GC_dont_precollect = 0;
+
 GC_bool GC_quiet = 0;
 
+GC_bool GC_print_stats = 0;
+
 #ifdef FIND_LEAK
   int GC_find_leak = 1;
 #else
   int GC_find_leak = 0;
 #endif
 
+#ifdef ALL_INTERIOR_POINTERS
+  int GC_all_interior_pointers = 1;
+#else
+  int GC_all_interior_pointers = 0;
+#endif
+
 /*ARGSUSED*/
 GC_PTR GC_default_oom_fn GC_PROTO((size_t bytes_requested))
 {
@@ -107,9 +133,10 @@ extern signed_word GC_mem_found;
     {
 	register unsigned i;
 
-	/* Map size 0 to something bigger.			   */
-        /* This avoids problems at lower levels. 		   */
-	/* One word objects don't have to be 2 word aligned.	   */
+	/* Map size 0 to something bigger.			*/
+	/* This avoids problems at lower levels.		*/
+	/* One word objects don't have to be 2 word aligned,	*/
+	/* unless we're using mark bytes.	   		*/
 	  for (i = 0; i < sizeof(word); i++) {
 	      GC_size_map[i] = MIN_WORDS;
 	  }
@@ -119,11 +146,7 @@ extern signed_word GC_mem_found;
 	    GC_size_map[sizeof(word)] = ROUNDED_UP_WORDS(sizeof(word));
 #	  endif
 	for (i = sizeof(word) + 1; i <= 8 * sizeof(word); i++) {
-#           ifdef ALIGN_DOUBLE
-	      GC_size_map[i] = (ROUNDED_UP_WORDS(i) + 1) & (~1);
-#           else
-	      GC_size_map[i] = ROUNDED_UP_WORDS(i);
-#           endif
+	    GC_size_map[i] = ALIGNED_WORDS(i);
 	}
 	for (i = 8*sizeof(word) + 1; i <= 16 * sizeof(word); i++) {
 	      GC_size_map[i] = (ROUNDED_UP_WORDS(i) + 1) & (~1);
@@ -186,10 +209,10 @@ extern signed_word GC_mem_found;
 #	    endif
 	}
     	byte_sz = WORDS_TO_BYTES(word_sz);
-#	ifdef ADD_BYTE_AT_END
+	if (GC_all_interior_pointers) {
 	    /* We need one extra byte; don't fill in GC_size_map[byte_sz] */
 	    byte_sz--;
-#	endif
+	}
 
     	for (j = low_limit; j <= byte_sz; j++) GC_size_map[j] = word_sz;  
     }
@@ -206,39 +229,24 @@ extern signed_word GC_mem_found;
  */
 word GC_stack_last_cleared = 0;	/* GC_no when we last did this */
 # ifdef THREADS
-#   define CLEAR_SIZE 512
-# else
-#   define CLEAR_SIZE 213
+#   define BIG_CLEAR_SIZE 2048	/* Clear this much now and then.	*/
+#   define SMALL_CLEAR_SIZE 256 /* Clear this much every time.		*/
 # endif
+# define CLEAR_SIZE 213  /* Granularity for GC_clear_stack_inner */
 # define DEGRADE_RATE 50
 
 word GC_min_sp;		/* Coolest stack pointer value from which we've */
 			/* already cleared the stack.			*/
 			
-# ifdef STACK_GROWS_DOWN
-#   define COOLER_THAN >
-#   define HOTTER_THAN <
-#   define MAKE_COOLER(x,y) if ((word)(x)+(y) > (word)(x)) {(x) += (y);} \
-			    else {(x) = (word)ONES;}
-#   define MAKE_HOTTER(x,y) (x) -= (y)
-# else
-#   define COOLER_THAN <
-#   define HOTTER_THAN >
-#   define MAKE_COOLER(x,y) if ((word)(x)-(y) < (word)(x)) {(x) -= (y);} else {(x) = 0;}
-#   define MAKE_HOTTER(x,y) (x) += (y)
-# endif
-
 word GC_high_water;
 			/* "hottest" stack pointer value we have seen	*/
 			/* recently.  Degrades over time.		*/
 
 word GC_words_allocd_at_reset;
 
-#if defined(ASM_CLEAR_CODE) && !defined(THREADS)
+#if defined(ASM_CLEAR_CODE)
   extern ptr_t GC_clear_stack_inner();
-#endif  
-
-#if !defined(ASM_CLEAR_CODE) && !defined(THREADS)
+#else  
 /* Clear the stack up to about limit.  Return arg. */
 /*ARGSUSED*/
 ptr_t GC_clear_stack_inner(arg, limit)
@@ -266,10 +274,13 @@ ptr_t arg;
 {
     register word sp = (word)GC_approx_sp();  /* Hotter than actual sp */
 #   ifdef THREADS
-        word dummy[CLEAR_SIZE];
-#   else
-    	register word limit;
+        word dummy[SMALL_CLEAR_SIZE];
+	static unsigned random_no = 0;
+       			 	 /* Should be more random than it is ... */
+				 /* Used to occasionally clear a bigger	 */
+				 /* chunk.				 */
 #   endif
+    register word limit;
     
 #   define SLOP 400
 	/* Extra bytes we clear every time.  This clears our own	*/
@@ -287,7 +298,14 @@ ptr_t arg;
 	/* thus more junk remains accessible, thus the heap gets	*/
 	/* larger ...							*/
 # ifdef THREADS
-    BZERO(dummy, CLEAR_SIZE*sizeof(word));
+    if (++random_no % 13 == 0) {
+	limit = sp;
+	MAKE_HOTTER(limit, BIG_CLEAR_SIZE*sizeof(word));
+	return GC_clear_stack_inner(arg, limit);
+    } else {
+	BZERO(dummy, SMALL_CLEAR_SIZE*sizeof(word));
+	return arg;
+    }
 # else
     if (GC_gc_no > GC_stack_last_cleared) {
         /* Start things over, so we clear the entire stack again */
@@ -317,8 +335,8 @@ ptr_t arg;
     	if (GC_min_sp HOTTER_THAN GC_high_water) GC_min_sp = GC_high_water;
     	GC_words_allocd_at_reset = GC_words_allocd;
     }  
+    return(arg);
 # endif
-  return(arg);
 }
 
 
@@ -347,37 +365,27 @@ ptr_t arg;
     /* to the beginning.						*/
 	while (IS_FORWARDING_ADDR_OR_NIL(candidate_hdr)) {
 	   h = FORWARDED_ADDR(h,candidate_hdr);
-	   r = (word)h + HDR_BYTES;
+	   r = (word)h;
 	   candidate_hdr = HDR(h);
 	}
     if (candidate_hdr -> hb_map == GC_invalid_map) return(0);
     /* Make sure r points to the beginning of the object */
 	r &= ~(WORDS_TO_BYTES(1) - 1);
         {
-	    register int offset = (char *)r - (char *)(HBLKPTR(r));
+	    register int offset = HBLKDISPL(r);
 	    register signed_word sz = candidate_hdr -> hb_sz;
-	    
-#	    ifdef ALL_INTERIOR_POINTERS
-	      register map_entry_type map_entry;
-	      
-	      map_entry = MAP_ENTRY((candidate_hdr -> hb_map), offset);
-	      if (map_entry == OBJ_INVALID) {
-            	return(0);
-              }
-              r -= WORDS_TO_BYTES(map_entry);
-              limit = r + WORDS_TO_BYTES(sz);
-#	    else
-	      register int correction;
+	    register signed_word map_entry;
 	      
-	      offset = BYTES_TO_WORDS(offset - HDR_BYTES);
-	      correction = offset % sz;
-	      r -= (WORDS_TO_BYTES(correction));
-	      limit = r + WORDS_TO_BYTES(sz);
-	      if (limit > (word)(h + 1)
-	        && sz <= BYTES_TO_WORDS(HBLKSIZE) - HDR_WORDS) {
+	    map_entry = MAP_ENTRY((candidate_hdr -> hb_map), offset);
+	    if (map_entry > CPP_MAX_OFFSET) {
+            	map_entry = (signed_word)(BYTES_TO_WORDS(offset)) % sz;
+            }
+            r -= WORDS_TO_BYTES(map_entry);
+            limit = r + WORDS_TO_BYTES(sz);
+	    if (limit > (word)(h + 1)
+	        && sz <= BYTES_TO_WORDS(HBLKSIZE)) {
 	        return(0);
-	      }
-#	    endif
+	    }
 	    if ((word)p >= limit) return(0);
 	}
     return((GC_PTR)r);
@@ -398,11 +406,7 @@ ptr_t arg;
     register hdr * hhdr = HDR(p);
     
     sz = WORDS_TO_BYTES(hhdr -> hb_sz);
-    if (sz < 0) {
-        return(-sz);
-    } else {
-        return(sz);
-    }
+    return(sz);
 }
 
 size_t GC_get_heap_size GC_PROTO(())
@@ -420,6 +424,11 @@ size_t GC_get_bytes_since_gc GC_PROTO(())
     return ((size_t) WORDS_TO_BYTES(GC_words_allocd));
 }
 
+size_t GC_get_total_bytes GC_PROTO(())
+{
+    return ((size_t) WORDS_TO_BYTES(GC_words_allocd+GC_words_allocd_before_gc));
+}
+
 GC_bool GC_is_initialized = FALSE;
 
 void GC_init()
@@ -434,58 +443,100 @@ void GC_init()
 
 }
 
+#if defined(MSWIN32) || defined(MSWINCE)
+    CRITICAL_SECTION GC_write_cs;
+#endif
+
 #ifdef MSWIN32
-    extern void GC_init_win32();
+    extern void GC_init_win32 GC_PROTO((void));
 #endif
 
 extern void GC_setpagesize();
 
+#ifdef UNIX_LIKE
+
+extern void GC_set_and_save_fault_handler GC_PROTO((void (*handler)(int)));
+
+static void looping_handler(sig)
+int sig;
+{
+    GC_err_printf1("Caught signal %d: looping in handler\n", sig);
+    for(;;);
+}
+#endif
+
 void GC_init_inner()
 {
-#   ifndef THREADS
+#   if !defined(THREADS) && defined(GC_ASSERTIONS)
         word dummy;
 #   endif
+    word initial_heap_sz = (word)MINHINCR;
     
     if (GC_is_initialized) return;
-    GC_setpagesize();
-    GC_exclude_static_roots(beginGC_arrays, end_gc_area);
 #   ifdef PRINTSTATS
-	if ((ptr_t)endGC_arrays != (ptr_t)(&GC_obj_kinds)) {
-	    GC_printf0("Reordering linker, didn't exclude obj_kinds\n");
-	}
+      GC_print_stats = 1;
+#   endif
+    if (0 != GETENV("GC_PRINT_STATS")) {
+      GC_print_stats = 1;
+    } 
+    if (0 != GETENV("GC_FIND_LEAK")) {
+      GC_find_leak = 1;
+    }
+    if (0 != GETENV("GC_ALL_INTERIOR_POINTERS")) {
+      GC_all_interior_pointers = 1;
+    }
+    if (0 != GETENV("GC_DONT_GC")) {
+      GC_dont_gc = 1;
+    }
+#   ifdef UNIX_LIKE
+      if (0 != GETENV("GC_LOOP_ON_ABORT")) {
+        GC_set_and_save_fault_handler(looping_handler);
+      }
+#   endif
+    /* Adjust normal object descriptor for extra allocation.	*/
+    if (ALIGNMENT > GC_DS_TAGS && EXTRA_BYTES != 0) {
+      GC_obj_kinds[NORMAL].ok_descriptor = ((word)(-ALIGNMENT) | GC_DS_LENGTH);
+    }
+#   if defined(MSWIN32) || defined(MSWINCE)
+	InitializeCriticalSection(&GC_write_cs);
+#   endif
+    GC_setpagesize();
+    GC_exclude_static_roots(beginGC_arrays, endGC_arrays);
+    GC_exclude_static_roots(beginGC_obj_kinds, endGC_obj_kinds);
+#   ifdef SEPARATE_GLOBALS
+      GC_exclude_static_roots(beginGC_objfreelist, endGC_objfreelist);
+      GC_exclude_static_roots(beginGC_aobjfreelist, endGC_aobjfreelist);
 #   endif
 #   ifdef MSWIN32
  	GC_init_win32();
 #   endif
 #   if defined(SEARCH_FOR_DATA_START)
-	/* This doesn't really work if the collector is in a shared library. */
 	GC_init_linux_data_start();
 #   endif
-#   ifdef SOLARIS_THREADS
-	GC_thr_init();
-	/* We need dirty bits in order to find live stack sections.	*/
-        GC_dirty_init();
+#   if defined(NETBSD) && defined(__ELF__)
+	GC_init_netbsd_elf();
 #   endif
 #   if defined(IRIX_THREADS) || defined(LINUX_THREADS) \
-       || defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS)
+       || defined(HPUX_THREADS) || defined(SOLARIS_THREADS)
         GC_thr_init();
 #   endif
+#   ifdef SOLARIS_THREADS
+	/* We need dirty bits in order to find live stack sections.	*/
+        GC_dirty_init();
+#   endif
 #   if !defined(THREADS) || defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \
        || defined(IRIX_THREADS) || defined(LINUX_THREADS) \
        || defined(HPUX_THREADS)
       if (GC_stackbottom == 0) {
 	GC_stackbottom = GC_get_stack_base();
+#       if defined(LINUX) && defined(IA64)
+	  GC_register_stackbottom = GC_get_register_stack_base();
+#       endif
       }
 #   endif
-    if  (sizeof (ptr_t) != sizeof(word)) {
-        ABORT("sizeof (ptr_t) != sizeof(word)\n");
-    }
-    if  (sizeof (signed_word) != sizeof(word)) {
-        ABORT("sizeof (signed_word) != sizeof(word)\n");
-    }
-    if  (sizeof (struct hblk) != HBLKSIZE) {
-        ABORT("sizeof (struct hblk) != HBLKSIZE\n");
-    }
+    GC_ASSERT(sizeof (ptr_t) == sizeof(word));
+    GC_ASSERT(sizeof (signed_word) == sizeof(word));
+    GC_ASSERT(sizeof (struct hblk) == HBLKSIZE);
 #   ifndef THREADS
 #     if defined(STACK_GROWS_UP) && defined(STACK_GROWS_DOWN)
   	ABORT(
@@ -496,40 +547,16 @@ void GC_init_inner()
   	  "One of STACK_GROWS_UP and STACK_GROWS_DOWN should be defd\n");
 #     endif
 #     ifdef STACK_GROWS_DOWN
-        if ((word)(&dummy) > (word)GC_stackbottom) {
-          GC_err_printf0(
-          	"STACK_GROWS_DOWN is defd, but stack appears to grow up\n");
-#	  ifndef UTS4  /* Compiler bug workaround */
-            GC_err_printf2("sp = 0x%lx, GC_stackbottom = 0x%lx\n",
-          	   	   (unsigned long) (&dummy),
-          	   	   (unsigned long) GC_stackbottom);
-#	  endif
-          ABORT("stack direction 3\n");
-        }
+        GC_ASSERT((word)(&dummy) <= (word)GC_stackbottom);
 #     else
-        if ((word)(&dummy) < (word)GC_stackbottom) {
-          GC_err_printf0(
-          	"STACK_GROWS_UP is defd, but stack appears to grow down\n");
-          GC_err_printf2("sp = 0x%lx, GC_stackbottom = 0x%lx\n",
-          	       	 (unsigned long) (&dummy),
-          	     	 (unsigned long) GC_stackbottom);
-          ABORT("stack direction 4");
-        }
+        GC_ASSERT((word)(&dummy) >= (word)GC_stackbottom);
 #     endif
 #   endif
 #   if !defined(_AUX_SOURCE) || defined(__GNUC__)
-      if ((word)(-1) < (word)0) {
-    	GC_err_printf0("The type word should be an unsigned integer type\n");
-    	GC_err_printf0("It appears to be signed\n");
-    	ABORT("word");
-      }
+      GC_ASSERT((word)(-1) > (word)0);
+      /* word should be unsigned */
 #   endif
-    if ((signed_word)(-1) >= (signed_word)0) {
-    	GC_err_printf0(
-    		"The type signed_word should be a signed integer type\n");
-    	GC_err_printf0("It appears to be unsigned\n");
-    	ABORT("signed_word");
-    }
+    GC_ASSERT((signed_word)(-1) < (signed_word)0);
     
     /* Add initial guess of root sets.  Do this first, since sbrk(0)	*/
     /* might be used.							*/
@@ -537,7 +564,18 @@ void GC_init_inner()
     GC_init_headers();
     GC_bl_init();
     GC_mark_init();
-    if (!GC_expand_hp_inner((word)MINHINCR)) {
+    {
+	char * sz_str = GETENV("GC_INITIAL_HEAP_SIZE");
+	if (sz_str != NULL) {
+	  initial_heap_sz = atoi(sz_str);
+	  if (initial_heap_sz <= MINHINCR * HBLKSIZE) {
+	    WARN("Bad initial heap size %s - ignoring it.\n",
+		 sz_str);
+	  } 
+	  initial_heap_sz = divHBLKSZ(initial_heap_sz);
+	}
+    }
+    if (!GC_expand_hp_inner(initial_heap_sz)) {
         GC_err_printf0("Can't start up: not enough memory\n");
         EXIT();
     }
@@ -562,11 +600,11 @@ void GC_init_inner()
       GC_pcr_install();
 #   endif
     /* Get black list set up */
-      GC_gcollect_inner();
+      if (!GC_dont_precollect) GC_gcollect_inner();
+    GC_is_initialized = TRUE;
 #   ifdef STUBBORN_ALLOC
     	GC_stubborn_init();
 #   endif
-    GC_is_initialized = TRUE;
     /* Convince lint that some things are used */
 #   ifdef LINT
       {
@@ -631,25 +669,41 @@ out:
 }
 
 
-#ifdef MSWIN32
-# define LOG_FILE "gc.log"
+#if defined(MSWIN32) || defined(MSWINCE)
+# define LOG_FILE _T("gc.log")
 
-  HANDLE GC_stdout = 0, GC_stderr;
-  int GC_tmp;
-  DWORD GC_junk;
+  HANDLE GC_stdout = 0;
 
-  void GC_set_files()
+  void GC_deinit()
   {
-    if (!GC_stdout) {
-        GC_stdout = CreateFile(LOG_FILE, GENERIC_WRITE,
-        		       FILE_SHARE_READ | FILE_SHARE_WRITE,
-        		       NULL, CREATE_ALWAYS, FILE_FLAG_WRITE_THROUGH,
-        		       NULL); 
-    	if (INVALID_HANDLE_VALUE == GC_stdout) ABORT("Open of log file failed");
-    }
-    if (GC_stderr == 0) {
-	GC_stderr = GC_stdout;
-    }
+      if (GC_is_initialized) {
+  	DeleteCriticalSection(&GC_write_cs);
+      }
+  }
+
+  int GC_write(buf, len)
+  char * buf;
+  size_t len;
+  {
+      BOOL tmp;
+      DWORD written;
+      if (len == 0)
+	  return 0;
+      EnterCriticalSection(&GC_write_cs);
+      if (GC_stdout == INVALID_HANDLE_VALUE) {
+	  return -1;
+      } else if (GC_stdout == 0) {
+	  GC_stdout = CreateFile(LOG_FILE, GENERIC_WRITE,
+        			 FILE_SHARE_READ | FILE_SHARE_WRITE,
+        			 NULL, CREATE_ALWAYS, FILE_FLAG_WRITE_THROUGH,
+        			 NULL); 
+    	  if (GC_stdout == INVALID_HANDLE_VALUE) ABORT("Open of log file failed");
+      }
+      tmp = WriteFile(GC_stdout, buf, len, &written, NULL);
+      if (!tmp)
+	  DebugBreak();
+      LeaveCriticalSection(&GC_write_cs);
+      return tmp ? (int)written : -1;
   }
 
 #endif
@@ -670,7 +724,7 @@ int GC_tmp;  /* Should really be local ... */
   }
 #endif
 
-#if !defined(OS2) && !defined(MACOS) && !defined(MSWIN32)
+#if !defined(OS2) && !defined(MACOS) && !defined(MSWIN32) && !defined(MSWINCE)
   int GC_stdout = 1;
   int GC_stderr = 2;
 # if !defined(AMIGA)
@@ -678,7 +732,7 @@ int GC_tmp;  /* Should really be local ... */
 # endif
 #endif
 
-#if !defined(MSWIN32)  && !defined(OS2) && !defined(MACOS) && !defined(ECOS)
+#if !defined(MSWIN32) && !defined(MSWINCE) && !defined(OS2) && !defined(MACOS)
 int GC_write(fd, buf, len)
 int fd;
 char *buf;
@@ -710,11 +764,8 @@ int GC_write(fd, buf, len)
 #endif
 
 
-#ifdef MSWIN32
-#   define WRITE(f, buf, len) (GC_set_files(), \
-			       GC_tmp = WriteFile((f), (buf), \
-			       			  (len), &GC_junk, NULL),\
-			       (GC_tmp? 1 : -1))
+#if defined(MSWIN32) || defined(MSWINCE)
+#   define WRITE(f, buf, len) GC_write(buf, len)
 #else
 #   if defined(OS2) || defined(MACOS)
 #   define WRITE(f, buf, len) (GC_set_files(), \
@@ -732,7 +783,7 @@ int GC_write(fd, buf, len)
 /* same size as long, and that the format conversions expect something	  */
 /* of that size.							  */
 void GC_printf(format, a, b, c, d, e, f)
-char * format;
+GC_CONST char * format;
 long a, b, c, d, e, f;
 {
     char buf[1025];
@@ -745,7 +796,7 @@ long a, b, c, d, e, f;
 }
 
 void GC_err_printf(format, a, b, c, d, e, f)
-char * format;
+GC_CONST char * format;
 long a, b, c, d, e, f;
 {
     char buf[1025];
@@ -757,11 +808,20 @@ long a, b, c, d, e, f;
 }
 
 void GC_err_puts(s)
-char *s;
+GC_CONST char *s;
 {
     if (WRITE(GC_stderr, s, strlen(s)) < 0) ABORT("write to stderr failed");
 }
 
+#if defined(LINUX) && !defined(SMALL_CONFIG)
+void GC_err_write(buf, len)
+GC_CONST char *buf;
+size_t len;
+{
+    if (WRITE(GC_stderr, buf, len) < 0) ABORT("write to stderr failed");
+}
+#endif
+
 # if defined(__STDC__) || defined(__cplusplus)
     void GC_default_warn_proc(char *msg, GC_word arg)
 # else
@@ -794,10 +854,26 @@ GC_warn_proc GC_current_warn_proc = GC_default_warn_proc;
 
 #ifndef PCR
 void GC_abort(msg)
-char * msg;
+GC_CONST char * msg;
 {
-    GC_err_printf1("%s\n", msg);
-    (void) abort();
+#   if defined(MSWIN32)
+      (void) MessageBoxA(NULL, msg, "Fatal error in gc", MB_ICONERROR|MB_OK);
+      DebugBreak();
+#   else
+      GC_err_printf1("%s\n", msg);
+#   endif
+    if (GETENV("GC_LOOP_ON_ABORT") != NULL) {
+	    /* In many cases it's easier to debug a running process.	*/
+	    /* It's arguably nicer to sleep, but that makes it harder	*/
+	    /* to look at the thread if the debugger doesn't know much	*/
+	    /* about threads.						*/
+	    for(;;);
+    }
+#   ifdef MSWIN32
+	DebugBreak();
+#   else
+        (void) abort();
+#   endif
 }
 #endif
 
@@ -860,4 +936,4 @@ void GC_dump()
     GC_print_block_list();
 }
 
-# endif /* NO_DEBUGGING */
+#endif /* NO_DEBUGGING */