[PATCH v2 0/7] Thread handle to thread info mapping

[Kevin Buettner <kevin@buettner.to>]

This patch set introduces support 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 (e.g. pthread_t)
within an implementation of a thread library built atop pthreads.
The mechanism is general enough however to support other thread
handle representations as well.

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.  It has been adjusted to address Eli's
concerns in the earlier patch series.

Part 4 adds a test case. I've extended this test case slightly from the
patch in the earlier series.

Part 5 is a bug fix for a problem discovered while working on part 6.

Part 6 adds support for remote targets.

Part 7 is a documentation patch for the remote protocol changes that
were implemented in part 6.