[Bug libstdc++/33578] __gnu_parallel::yield broken on mingw32

["dannysmith at users dot sourceforge dot net" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #5 from dannysmith at users dot sourceforge dot net  2007-10-09 23:54 -------
(In reply to comment #2)
> Created an attachment (id=14332)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14332&action=view) [edit]
> Consistent use of _WIN32 define
> 
Thats not quite right.  ___MINGW32__ defines _WIN32 but doesn't have an
intrin.h.  I believe that is for MSVC compiler specific intrinsics.  _MSC_VER
is a MSVC compiler builtin define.

Also, Cygwin  __may__ define _W32 (with -mwin32 switch) but still should use
its own implementation of <sched.h> and sched_yield  since it uses pthreads 


I'll attach what I'm using currently.  Putting more #ifdef's into this file
certainly doesn't make it any prettier. If wanted, I could prepare a patch that
gets rid of *all* the non-GNU (Windows) stuff and just put a __MINGW32__
specific definition of a __gnu_parallel::sched_yield() into os_defines.h. 

FWIW,  boost uses Sleep(1) -- not Sleep(0) --  for sched_yield() on windows,
while cygwin use SwitchToThread()


Dann\y


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33578