Changeset 2525 for trunk/src/kernel32

Timestamp:

Jan 27, 2000, 12:19:06 AM (26 years ago)

Author:

sandervl

Message:

Added workaround for OS/2 DosSetMem bug in VirtualAlloc

File:

• trunk/src/kernel32/virtual.cpp (modified) (2 diffs)

trunk/src/kernel32/virtual.cpp

@@ -1 @@
-/* $Id: virtual.cpp,v 1.26 1999-12-30 11:19:54 sandervl Exp $ */
+/* $Id: virtual.cpp,v 1.27 2000-01-26 23:19:06 sandervl Exp $ */
 
 /*
@@ -286 +286 @@
         flag = PAG_COMMIT;
   }
-
+  
+  if(fdwAllocationType & MEM_RESERVE) {
+        //SvL: DosRead crashes if memory is initially reserved with write
+        //     access disabled (OS/2 bug) even if the commit sets the page
+        //     flags to read/write:
+        // DosSetMem does not alter the 16 bit selectors so if you change memory
+        // attributes and then access the memory with a 16 bit API (such as DosRead),
+        // it will have the old (alloc time) attributes
+        flag |= PAG_READ|PAG_WRITE; 
+  }
   if(fdwProtect & PAGE_READONLY)     flag |= PAG_READ;
   if(fdwProtect & PAGE_NOACCESS)     flag |= PAG_READ; //can't do this in OS/2