[RFC] Thread Name Printers

[Aaron Gamble <agamble at google dot com>]

Hi all,

This is a patch that adds thread name printers to GDB. Like
pretty-printers, they are Python classes that augment the output of
thread names.

gdb/ChangeLog:
    * data-directory/Makefile.in: Add gdb/thread_printing.py.
    * doc/gdb.texinfo: Add section about thread name printers in Python section.
    Add reference to thread name printers in 'info threads' section.
    * python/lib/gdb/__init__.py: Import ThreadNamePrinter.
    * python/lib/gdb/thread_printing.py: new file.
    (class ThreadNamePrinter): base class, contains helper functions
and list of registered printers.
    (class ExamplePrinter): example printer class for reference.
    (class EnableThreadNamePrinter, DisableThreadNamePrinter,
InfoThreadNamePrinter):
        gdb.commands for managing and getting information about thread
name printers.
    (register_thread_name_printer_commands): Registers thread name
printer commands.
    * python/py-inferior.c (add_thread_object): Save pointer to
thread_object in thread_info.
    * python/py-infthread.c (prepare_thread_name_printers): Prepares
all the registered thread name printers
        and returns a list of the printers. Called once by
thread.c:print_thread_info.
    (thread_printer_enabled): Returns TRUE if printer enabled.
    (apply_thread_name_pretty_printers): Iterates through the list of
printers calling print_thread until one returns a string.
        Called for each thread by thread.c:print_thread_info
    * python/python-internal.h: Extern gdbpy_print_thread_cst PyObject
string object.
    * pyhon/python.c: Declare and assign gdbpy_print_thread_cst.
    * testsuite/gdb.python/Makefile.in: add py-threadprettyprint.
    * testsuite/gdb.python/py-threadprettyprint.c: Basic threaded
program for testing thread name printing.
    * testsuite/gdb.python/py-threadprettyprint.exp: Tests for thread
name printers.
    * thread.c (print_thread_info): Calls prepare_thread_name_printers
to initialize printers and get list of printers.
        Calls apply_thread_name_pretty_printers for each thread if no
name for thread is already stored.
    (_initialize_thread): Add aliases for 'info threads' to
disambiguate between 'info thread-name-printer'

Attachment: thread_name_printer.patch
Description: Binary data