Add target method for converting thread handle to thread_info struct pointer

This patch adds a target method named `to_thread_handle_to_thread_info'.
It is intended to map a thread library specific thread handle (such as
pthread_t for the pthread library) to the corresponding GDB internal
thread_info struct (pointer).

An implementation is provided for Linux pthreads; see linux-thread-db.c.

gdb/ChangeLog:

	* target.h (struct target_ops): Add to_thread_handle_to_thread_info.
	(target_thread_handle_to_thread_info): Declare.
	* target.c (target_thread_handle_to_thread_info): New function.
	* target-delegates.c: Regenerate.
	* gdbthread.h (find_thread_by_handle): Declare.
	* thread.c (find_thread_by_handle): New function.
	* linux-thread-db.c (thread_db_thread_handle_to_thread_info): New
	function.
	(init_thread_db_ops): Register thread_db_thread_handle_to_thread_info.

1 files changed, 9 insertions, 0 deletions

diff --git a/gdb/target.c b/gdb/target.c
index 55ff99e..5a2c087 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -2244,6 +2244,15 @@ target_thread_name (struct thread_info *info)
   return current_target.to_thread_name (&current_target, info);
 }
 
+struct thread_info *
+target_thread_handle_to_thread_info (const gdb_byte *thread_handle,
+				     int handle_len,
+				     struct inferior *inf)
+{
+  return current_target.to_thread_handle_to_thread_info
+           (&current_target, thread_handle, handle_len, inf);
+}
+
 void
 target_resume (ptid_t ptid, int step, enum gdb_signal signal)
 {