X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/2b0c7330457b8ca42375c92ada7dc7cefb0fa9fb..fb39b937b0628f4592b07d0aa61a41cf696abd30:/src/w32heap.c

diff --git a/src/w32heap.c b/src/w32heap.c
index bbdabd2350..dc65198f90 100644
--- a/src/w32heap.c
+++ b/src/w32heap.c
@@ -1,5 +1,5 @@
-/* Heap management routines for GNU Emacs on the Microsoft W32 API.
-   Copyright (C) 1994, 2001-2011  Free Software Foundation, Inc.
+/* Heap management routines for GNU Emacs on the Microsoft Windows API.
+   Copyright (C) 1994, 2001-2012  Free Software Foundation, Inc.
 
 This file is part of GNU Emacs.
 
@@ -22,7 +22,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 #include <stdio.h>
-#include <setjmp.h>
 
 #include "w32heap.h"
 #include "lisp.h"  /* for VALMASK */
@@ -66,7 +65,7 @@ cache_system_info (void)
   w32_minor_version = version.info.minor;
 
   if (version.info.platform & 0x8000)
-    os_subtype = OS_WIN95;
+    os_subtype = OS_9X;
   else
     os_subtype = OS_NT;
 
@@ -79,7 +78,7 @@ cache_system_info (void)
   GetVersionEx (&osinfo_cache);
 
   w32_build_number = osinfo_cache.dwBuildNumber;
-  if (os_subtype == OS_WIN95)
+  if (os_subtype == OS_9X)
     w32_build_number &= 0xffff;
 }
 
@@ -114,6 +113,7 @@ get_data_end (void)
   return data_region_end;
 }
 
+#if !USE_LSB_TAG
 static char *
 allocate_heap (void)
 {
@@ -140,9 +140,31 @@ allocate_heap (void)
 
   return ptr;
 }
+#else  /* USE_LSB_TAG */
+static char *
+allocate_heap (void)
+{
+  unsigned long size = 0x80000000; /* start by asking for 2GB */
+  void *ptr = NULL;
+
+  while (!ptr && size > 0x00100000)
+    {
+      reserved_heap_size = size;
+      ptr = VirtualAlloc (NULL,
+			  get_reserved_heap_size (),
+			  MEM_RESERVE,
+			  PAGE_NOACCESS);
+      size -= 0x00800000; /* if failed, decrease request by 8MB */
+    }
+
+  return ptr;
+}
+#endif /* USE_LSB_TAG */
 
 
-/* Emulate Unix sbrk.  */
+/* Emulate Unix sbrk.  Note that ralloc.c expects the return value to
+   be the address of the _start_ (not end) of the new block in case of
+   success, and zero (not -1) in case of failure.  */
 void *
 sbrk (unsigned long increment)
 {
@@ -236,7 +258,7 @@ init_heap (void)
 	  exit (1);
 	}
 
-#if !defined (USE_LISP_UNION_TYPE) && !defined (USE_LSB_TAG)
+#if !USE_LSB_TAG
       /* Ensure that the addresses don't use the upper tag bits since
 	 the Lisp type goes there.  */
       if (((unsigned long) data_region_base & ~VALMASK) != 0)
@@ -273,27 +295,3 @@ round_heap (unsigned long align)
   if (need_to_alloc)
     sbrk (need_to_alloc);
 }
-
-#if (_MSC_VER >= 1000 && _MSC_VER < 1300 && !defined (USE_CRT_DLL))
-
-/* MSVC 4.2 invokes these functions from mainCRTStartup to initialize
-   a heap via HeapCreate.  They are normally defined by the runtime,
-   but we override them here so that the unnecessary HeapCreate call
-   is not performed.  */
-
-int __cdecl
-_heap_init (void)
-{
-  /* Stepping through the assembly indicates that mainCRTStartup is
-     expecting a nonzero success return value.  */
-  return 1;
-}
-
-void __cdecl
-_heap_term (void)
-{
-  return;
-}
-
-#endif
-