[PATCH 0/4] Thread handle to (GDB internal) thread object mapping

[Kevin Buettner <kevinb@redhat.com>]

This patch set introduces an interface/mechanism for mapping thread
handles to the thread_info structs which GDB uses to keep track of
threads in the inferiors which it's debugging.  I need this in order
to find the GDB thread which corresponds to a saved thread handle (of
type pthread_t) within an implementation of a thread library built
atop pthreads.

Part 1 introduces a target method which maps a thread handle to
the corresponding internal GDB thread object, i.e. something of type
`struct thread_info *'.  An implementation of this new method is
provided for the Linux thread target.  Additional work will be
required, over time, for other thread targets.

Part 2 adds a python interface for the mechanism introduced in part 1.

Part 3 is a documentation patch.

Part 4 adds a test case.