PATCH: Improve performance of gthr-win32

[Christopher Faylor]

On Mon, Mar 15, 2004 at 10:46:02PM +0800, Wu Yongwei wrote:
>This is my attempt to solve the performance overhead of __gthread_mutex
>functions.  On Win32, in order to support __gthread_mutex_trylock,
>currently MUTEXs instead of CRITICAL_SECTIONs are used to represent the
>__gthread_mutex_t, but MUTEXs are far slower.  According to my own
>measurement, the overhead is about 60:1.
>
>When my first attempt to address this problem by implementing
>TryEnterCriticalSection on Windows 9x failed, Thomas Pfaff showed
>another way:
>
>http://article.gmane.org/gmane.comp.gnu.mingw.devel/803
>
>And I have finally done this.  Please have a check.  There are the
>patch, two test files, and my test log.  The only drawback is that it
>requires Windows 98 or later, and Windows NT 4 or later.  I do not think
>it a problem, but I am willing to write another patch to solve the
>problem using inline assembly if people here insist that Windows 95 is
>important.

When you presented these patches to the mingw-dvlpr mailing list there
was some question about copyright.  We need your assurance that you both
have an assignment on file with the FSF for changes to gcc and that you
have not adapted these patches from some other project like
pthreads-win32 or cygwin.

cgf