kosaki	2011-07-07 18:09:44 +0900 (Thu, 07 Jul 2011)

  New Revision: 32437

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=32437

  Log:
    add a comment why FreeBSD can't use MAP_STACK.

  Modified files:
    trunk/cont.c

Index: cont.c
===================================================================
--- cont.c	(revision 32436)
+++ cont.c	(revision 32437)
@@ -517,6 +517,10 @@
 }
 #else /* _WIN32 */
 
+/*
+ * FreeBSD require a first (i.e. addr) argument of mmap(2) is not NULL
+ * if MAP_STACK is passed.
+ */
 #if defined(MAP_STACK) && !defined(__FreeBSD__)
 #define FIBER_STACK_FLAGS (MAP_PRIVATE | MAP_ANON | MAP_STACK)
 #else

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