--- a/runtime/block_alloc.h	Sat Oct 10 16:43:37 2009 -0400
+++ b/runtime/block_alloc.h	Wed May 05 22:12:23 2010 -0400
@@ -6,7 +6,14 @@
 #include <windows.h>
 
 #define block_alloc(size)      VirtualAlloc(NULL, size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
-#define block_free(block,size) VirtualFree(block, size, MEM_RELEASE)
+#define block_free(block,size) VirtualFree(block, size, MEM_RELEASE)
+
+#else
+#define BLOCK_SIZE 1024*4
+#include <sys/mman.h>
+
+#define block_alloc(size)      mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0)
+#define block_free(block,size) munmap(block, size)
 
 #endif