[llvm-commits] [llvm] r72332 - /llvm/trunk/lib/System/Unix/Process.inc

[Jay Foad]

Author: foad
Date: Sat May 23 12:57:59 2009
New Revision: 72332

URL: http://llvm.org/viewvc/llvm-project?rev=72332&view=rev
Log:
Work around a page size issue on Cygwin.

Modified:
    llvm/trunk/lib/System/Unix/Process.inc

Modified: llvm/trunk/lib/System/Unix/Process.inc
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/System/Unix/Process.inc?rev=72332&r1=72331&r2=72332&view=diff

==============================================================================
--- llvm/trunk/lib/System/Unix/Process.inc (original)
+++ llvm/trunk/lib/System/Unix/Process.inc Sat May 23 12:57:59 2009
@@ -42,7 +42,12 @@
 unsigned 
 Process::GetPageSize() 
 {
-#if defined(HAVE_GETPAGESIZE)
+#if defined(__CYGWIN__)
+  // On Cygwin, getpagesize() returns 64k but the page size for the purposes of
+  // memory protection and mmap() is 4k.
+  // See http://www.cygwin.com/ml/cygwin/2009-01/threads.html#00492
+  static const int page_size = 0x1000;
+#elif defined(HAVE_GETPAGESIZE)
   static const int page_size = ::getpagesize();
 #elif defined(HAVE_SYSCONF)
   static long page_size = ::sysconf(_SC_PAGE_SIZE);