2011-05-20 Pedro Alves <pedro@codesourcery.com>

2011-05-20  Pedro Alves  <pedro@codesourcery.com>

	gdb/
	* tracepoint.c: Include exceptions.h.
	(TFILE_PID): Move higher in file.
	(tfile_open): Delay pushing the tfile target until we're assured
	the tfile header is present in the file.  Wrap reading the initial
	newline-terminated lines in TRY_CATCH.  Pop the target if the
	initial setup failed.  Add the tfile's thread immediately
	aftwards, before any non-essential setup.  Don't skip
	post_create_inferior if there are no traceframes present in the
	file.
	(tfile_close): Remove redundant check for null before xfree call.
	(tfile_thread_alive): New function.
	(init_tfile_ops): Register it as to_thread_alive callback.