This introduces the wakeup fd interface, corresponding approximately to
the existing Google version, complete with a ported giant detailed usage
comment.
The implementation has two layers, "specialized" and "fallback". The
specialized layer is intended to be a suitable platform specific
implementation like eventfd, whereas "fallback" is probably pipe, with
runtime detection of whether the specialized version works on this
system (currently stubbed out).
- Changed the unsigned char * + size to NULL terminated strings which
makes sense for the PEM format. I may change TSI later (but the impact
will hopefully be much more limited).
- Added a way to pass multiple key/cert pairs to servers which is needed
when hosting more than one domain.
- Removed the C++ SSL credentials tests as we are going to have an
option to not specify the roots which will then be derived from the
environment (well-known platform dependent locations and/or
environment variable).
- Fixed the php build which is the only one added in the run_test.py.
This change will certainly break node, python and ruby.
This change pulls out a separate pollset_kick module, which currently
uses a freelist of pipes dynamically assigned to pollsets when they
enter polling rather than the previous racy sharding mechanism.
We ultimately may wish to eliminate the dynamic assignment for multipoll
sets, but this should be sufficient for the moment.