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cont.c: supplement comments of FIBER_USE_NATIVE

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* cont.c (FIBER_USE_NATIVE): supplement comments the reason why it is
  disabled.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43192 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2013-10-08 01:44:45 +00:00
parent a8178c69be
commit 8802842607
1 changed files with 25 additions and 14 deletions
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39
cont.c
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@ -15,20 +15,6 @@
#include "gc.h"
#include "eval_intern.h"
#if !defined(FIBER_USE_NATIVE)
# if defined(HAVE_GETCONTEXT) && defined(HAVE_SETCONTEXT)
# if defined(__NetBSD__)
# elif defined(__sun)
# elif defined(__ia64)
# else
# define FIBER_USE_NATIVE 1
# endif
# elif defined(_WIN32)
# if _WIN32_WINNT >= 0x0400
# define FIBER_USE_NATIVE 1
# endif
# endif
/* FIBER_USE_NATIVE enables Fiber performance improvement using system
* dependent method such as make/setcontext on POSIX system or
* CreateFiber() API on Windows.
@ -40,11 +26,36 @@
* in Proc. of 51th Programming Symposium, pp.21--28 (2010) (in Japanese).
*/
#if !defined(FIBER_USE_NATIVE)
# if defined(HAVE_GETCONTEXT) && defined(HAVE_SETCONTEXT)
# if 0
# elif defined(__NetBSD__)
/* On our experience, NetBSD doesn't support using setcontext() and pthread
* simultaneously. This is because pthread_self(), TLS and other information
* are represented by stack pointer (higher bits of stack pointer).
* TODO: check such constraint on configure.
*/
# define FIBER_USE_NATIVE 0
# elif defined(__sun)
/* On Solaris because resuming any Fiber caused SEGV, for some reason.
*/
# define FIBER_USE_NATIVE 0
# elif defined(__ia64)
/* At least, Linux/ia64's getcontext(3) doesn't save register window.
*/
# define FIBER_USE_NATIVE 0
# else
# define FIBER_USE_NATIVE 1
# endif
# elif defined(_WIN32)
# if _WIN32_WINNT >= 0x0400
/* only when _WIN32_WINNT >= 0x0400 on Windows because Fiber APIs are
* supported only such building (and running) environments.
* [ruby-dev:41192]
*/
# define FIBER_USE_NATIVE 1
# endif
# endif
#endif
#if !defined(FIBER_USE_NATIVE)
#define FIBER_USE_NATIVE 0