Lock module improvement

[Yoann Vandoorselaere]

Hi,

I would be interested in performing the following lock module
modification:

- Ability to disable specific backend on demand: some implementation use
certain functionality that are incompatible with libpth, or depend on
library that provide pthread support but no libpth support. As a result,
it would be great if it was possible to explicitly disable a given
backend.

- Implement support for condition variable.

- Implement support for thread creation.

Would people agree with such modification? 

What about function that does not have an equivalent under certain
backend (example: no support for condition timeout with libpth).

Regards,

-- 
Yoann Vandoorselaere <address@hidden>