Sun Aug 30 00:49:18 1998 Martin M. Hunt <hunt@cygnus.com>

Sun Aug 30 00:49:18 1998  Martin M. Hunt  <hunt@cygnus.com>

	* gdbtk-cmds.c (Gdbtk_Init): Link C variable gdb_context
	with tcl variable gdb_context_id.

	* gdbtk-hooks.c (gdbtk_context_change): Implement new hook called
	context_hook.  Called when threads change.

	* gdbtk.c: Initialize gdb_context.

	* gdbtk.h: Declare gdb_context.

	* infrun (wait_for_inferior): Call context_hook.

	* thread.c (thread_command): Call context_hook.

	* defs.h: Declare context_hook.