[Patch] PR35063 __gthread_mutex_destroy

[Janne Blomqvist]

Hello,

the attached patch adds __gthread_mutex_destroy as a function that all
thread implementations must provide. For posix, posix95, dce and tpf it
calls pthread_mutex_destroy, for win32 it calls CloseHandle, and for the
rest there is a null implementation that always returns success.

The origin of the patch was a gfortran bugreport where libgfortran
exhausted the available handles on windows due to not destroying the
mutex. As 4.3 was really close, it was decided to do a minimally
instrusive patch that only fixed the issue on windows where it was
reported (see http://gcc.gnu.org/ml/fortran/2008-02/msg00072.html). This
is the "proper" fix, and also fixes libgfortran to use
__gthread_mutex_destroy rather than the macro kludge the 4.3 patch did.

For the patch, I have merely guessed that the posix95, dce and tpf
implementations provide pthread_mutex_destroy, as I have no way of
testing these.

Ok for trunk?

-- 
Janne Blomqvist
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