[PATCH 2/3, newlib] Only define static locks in multithreaded mode

[Jeff Johnston]

Patch checked in.

-- JEff J.

----- Original Message -----
> Hi,
> 
> I've removed the changes to lock.h as requested. Please find attached an
> updated
> patch in git format-patch format.
> 
> Best regards,
> 
> Thomas
> 
> On 31/01/17 17:21, Thomas Preudhomme wrote:
> > And in git format-patch now.
> >
> > Best regards,
> >
> > Thomas
> >
> > On 31/01/17 17:10, Thomas Preudhomme wrote:
> >> Hi,
> >>
> >> Newlib build system defines __SINGLE_THREAD__ to allow concurrency code
> >> to be only compiled when newlib is configured for multithread. One such
> >> example are locks which become useless in single thread mode. Although
> >> most static locks are indeed guarded by !defined(__SINGLE_THREAD__),
> >> some are not.
> >>
> >> This commit adds these missing guards to __dd_hash_mutex,
> >> __atexit_recursive_mutex, __at_quick_exit_mutex and __arc4random_mutex.
> >> It also makes sure locking macros in lock.h are noop in single thread
> >> mode.
> >>
> >> Is this ok for master?
> >>
> >> Best regards,
> >>
> >> Thomas
>