Support buffer objects as handles in Inferior.thread_from_thread_handle()

InferiorThread.handle() returns a python bytes object.  We'd like to
be able to pass the output of this function, a thread handle, to
Inferior.thread_from_thread_handle().  Up to now,
thread_from_thread_handle() expects to receive a gdb.Value input.
This commit adds support to also allow a python buffer object to be
passed as the handle.

infpy_thread_from_thread_handle() calls find_thread_by_handle() which
has the obvious functionality.  It used to pass the thread handle via
a struct value pointer.  I've revised this interface to instead pass a
gdb::array_view<const gdb_byte> object.  (Thanks to Tom Tromey for
suggesting this data structure over an earlier version which passed a
gdb_byte pointer and length.)

gdb/ChangeLog:

	* gdbthread.h (find_thread_by_handle): Revise declaration.
	* thread.c (find_thread_by_handle): Likewise.  Adjust
	implementation too.
	* python/py-inferior.c (infpy_thread_from_thread_handle): Add
	support for buffer objects as handles.

1 files changed, 2 insertions, 2 deletions

diff --git a/gdb/gdbthread.h b/gdb/gdbthread.h
index 2d497d5..b9d8d7f 100644
--- a/gdb/gdbthread.h
+++ b/gdb/gdbthread.h
@@ -486,8 +486,8 @@ extern struct thread_info *find_thread_ptid (inferior *inf, ptid_t ptid);
 struct thread_info *find_thread_global_id (int global_id);
 
 /* Find thread by thread library specific handle in inferior INF.  */
-struct thread_info *find_thread_by_handle (struct value *thread_handle,
-					   struct inferior *inf);
+struct thread_info *find_thread_by_handle
+  (gdb::array_view<const gdb_byte> handle, struct inferior *inf);
 
 /* Finds the first thread of the specified inferior.  */
 extern struct thread_info *first_thread_of_inferior (inferior *inf);