core: Refactor initialization and how the default context is handled
Highlights for this change:
- usbi_default_context is only set if libusb_init() is called with NULL.
- All hotplug related functionality (e.g. initialization, processing) has been
moved to hotplug.c
- Backends are simplified by removing initialization mutexes. Mutual exclusion
between init()/exit() is provided by default_context_lock.
- Make hotplug types and functions part of libusbi.h with the common usbi_
prefixes (removes hotplug.h).
Addresses issue highlighted in #855
Closes #856
Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>
Signed-off-by: Nathan Hjelm <hjelmn@google.com>
28 files changed
