gdb: add '-stopped' and '-running' options to "info threads"

Add two options to "info threads": `-stopped` and `-running`.

The purpose of these options is to filter the output of the command.
The `-stopped` option means "print stopped threads only" and,
similarly, `-running` means "print the running threads only".  When
both options are provided by the user, the indication is that the user
wants the union.  That is, the output contains both stopped and
running threads.

Suppose we have an application with 5 threads, 2 of which have hit a
breakpoint.  The "info threads" command in the non-stop mode gives:

  (gdb) info threads
    Id   Target Id             Frame
  * 1    Thread 0x7ffff7d99740 (running)
    2    Thread 0x7ffff7d98700 something () at file.c:30
    3    Thread 0x7ffff7597700 (running)
    4    Thread 0x7ffff6d96700 something () at file.c:30
    5    Thread 0x7ffff6595700 (running)
  (gdb)

Using the "-stopped" flag, we get

  (gdb) info threads -stopped
    Id   Target Id             Frame
    2    Thread 0x7ffff7d98700 something () at file.c:30
    4    Thread 0x7ffff6d96700 something () at file.c:30
  (gdb)

Using the "-running" flag, we get

  (gdb) info threads -running
    Id   Target Id             Frame
  * 1    Thread 0x7ffff7d99740 (running)
    3    Thread 0x7ffff7597700 (running)
    5    Thread 0x7ffff6595700 (running)
  (gdb)

Using both flags prints all:

  (gdb) info threads -stopped -running
    Id   Target Id             Frame
  * 1    Thread 0x7ffff7d99740 (running)
    2    Thread 0x7ffff7d98700 something () at file.c:30
    3    Thread 0x7ffff7597700 (running)
    4    Thread 0x7ffff6d96700 something () at file.c:30
    5    Thread 0x7ffff6595700 (running)
  (gdb)

When combined with a thread ID, filtering applies to those threads that
are matched by the ID.

  (gdb) info threads 3
    Id   Target Id             Frame
    3    Thread 0x7ffff7597700 (running)
  (gdb) info threads -stopped 3
  No threads matched.
  (gdb)

Regression-tested on X86_64 Linux.

Reviewed-By: Eli Zaretskii <eliz@gnu.org>
Reviewed-By: Guinevere Larsen <guinevere@redhat.com>
Approved-by: Pedro Alves <pedro@palves.net

0 files changed, 0 insertions, 0 deletions