With the recent emergence of multiprocessors and multicore computers,
Transactional Memory (TM) is becoming the programming API of choice
for writing concurrent programs.  The transactional programming model
promises to simplify the task of writing concurrent, correct and
scalable programs.  In order to support this new model, debuggers will
need to change.  As far as we know, little work has been done on this
front.

In this talk, we describe the development of libtm_db, the first
library to provide debuggers with general debugging support for
transactional programs.  libtm_db is an open source, external library,
designed to assist debuggers for transactional programs by isolating
them from the internals of the particular runtime TM in use.  The
library is not targeted to a specific debugger, and can be extended
to support various runtime TM systems.  We hope that the library will
assist debugger writers in the required shift to supporting
transactional programs' debugging, and provide developers of new
runtime TM systems with a well-defined interface for transactional
debugging support.