tree a6377c25624d1021327071d1cb781961a5988d7d
parent 8a2fb8d87ec5b2f9e1d3ca1a5d755b5c1e363ff9
author Michael Ryleev <gmar@google.com> 1467063169 -0700
committer Michael Ryleev <gmar@google.com> 1517444245 -0800

[lib][trusty] Add support for handle sets

Handle set is a waitable object (represented by handle) that
can contain other handles. Functionally it is pretty close
to epoll in linux.

User can call:
 handle_set_create - to creates a new empty handle set
 handle_set_ctrl - to add/modify/delete content of specified
                   handle set.

After handle set is constructed user can wait on handle set
using "wait" call to get an event in a similar manner as it is
done for regular handles. Going forward, building and waiting
on handle set will be preferred mechanism for receiving events
for Trusty applications. Support for wait_any will be deprecated
and removed at some point.

Handle sets can be nested.

Change-Id: I6b68abd25456f411219ede0c43c29e7b8378ad5f