* remote.c (remote_threads_extra_info): new function.
Implement the extra thread info query for "info threads".
(remote_threads_info): clean up a bit.
(use_threadinfo_query, use_threadextra_query): new variables.
Control whether GDB will use the new or old protocol for
thread info queries.
(remote_open_1): initialize new variables.
(remote_async_open_1): ditto.
(remote_cisco_open): ditto.
* remote.c (remote_async_detach): Use target_mourn_inferior(), to
make sure that all is cleaned up after we disconnect from the
target.
(remote_detach): Ditto.
* infrun.c (set/show scheduler-locking) New command. Set a
mode bit that will control how GDB attempts to control thread
scheduling for step, continue, etc. (resume): make use of
the schedule-locking mode.
* target.h (struct target_ops): new field to_has_thread_control.
* sol-thread.c: initialize target_ops to_has_thread_control.
* procfs.c: ditto.
* target.c: ditto.
* m3-nat.c: ditto.
* remote.c: ditto.
* hpux-thread.c: ditto.
to conform to standards, fix spelling errors.
(ishex, stubhex, record_currthread, etc): Declare.
(ishex, stubhex): Declare char arg as int.
(pack_string): Comment out, never used but possibly useful.
(threadref_to_int, remote_get_threadinfo, etc): Make static.
called from wait_for_inferior. Instead, if a new thread-id is
detected, call add_thread. (MAGIC_NULL_PID): new macro, use
instead of the magic number "42000". (remote_find_new_threads):
if inferior_pid is unknown, get and use the current thread id.
(remote_start_remote): on connecting, attempt to get the current
thread id for inferior_pid. (remote_resume): If pid == -1,
then resume any-thread (not the current thread specifically).
* thread.c (info_threads_command): don't initialize current_pid
until after call to FIND_NEW_THREADS (which may change inferior_pid).
[Support for trace debugging: registers that were not collected.]
* remote.c (remote_fetch_registers): accept 'xxxx' in the register
packet, with the meaning "register value is not available".
Set register_valid to -1, which will connote "no value available".
* findvar.c (read_relative_register_raw_bytes): return failure if
register_valid == -1. (value_of_register): return failure if
register_valid == -1. (read_var_value): return error if
value_of_register fails for a register variable.
(value_from_register): return failure if register_valid == -1.
* eval.c (evaluate_subexp_standard): return error if
value_of_register fails for a register used in an expression.
* infcmd.c (do_registers_info): display "value not available"
for registers for which register_valid == -1.
* tracepoint.c (set_raw_tracepoint): just save the filename as is
from the symbol table, rather than trying to prepend the dir name.
Also save the bfd section. (tracepoints_info): use the section
when looking up the function name.
* tracepoint.h: add section field to tracepoint struct.
