[patch v1] manual: add more pthread functions

[DJ Delorie]

Collin Funk <collin.funk1@gmail.com> writes:
> These look good to me. I notice some missing @standards{...}, but as you
> mention those can be added when they are more than just stubs.

And by someone with the skills to actually figure out what they are ;-)

I assume pthreads functions are everything-safe but I didn't want to set
up a false authority on them.

> Two lines have a trailing space though:
>
>> +* Creating and Destroying Threads:: 
>
> and:
>
>> +Like @code{pthread_spin_unlock} but returns 0 if the lock was unlocked, or EBUSY if 
>
> Other than that, looks good.

Will fix.

> Reviewed-by: Collin Funk <collin.funk1@gmail.com>

Thanks!