[RFA] Implement thread death notification.

[Vladimir Prus <vladimir@codesourcery.com>]

We now have the 'thread-created' MI notification. This patch adds a
'thread-exited' notification to match. Are non-MI bits of this
patch OK?

- Volodya

	2008-03-29  Pedro Alves  <pedro@codesourcery.com>
	gdb/doc/
	* observer.texi (thread_exit): New.

	gdb/
	* linux-nat.c: Include observer.h.
	(exit_lwp): Call observer_notify_thread_exit.
	* Makefile.in (linux-nat.o): Update.
	* mi/mi-interp.c (mi_interpreter_init): Register mi_thread_exit as
	thread_exit observer.
	(mi_thread_exit): New.
---
 gdb/Makefile.in       |    3 ++-
 gdb/doc/observer.texi |    4 ++++
 gdb/linux-nat.c       |    6 +++++-
 gdb/mi/mi-interp.c    |   16 +++++++++++++++-
 4 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 9304bc2..9d72168 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -2375,7 +2375,8 @@ linux-nat.o: linux-nat.c $(defs_h) $(inferior_h) $(target_h) $(gdb_string_h) \
 	$(gdb_wait_h) $(gdb_assert_h) $(linux_nat_h) $(gdbthread_h) \
 	$(gdbcmd_h) $(regcache_h) $(regset_h) $(inf_ptrace_h) $(auxv_h) \
 	$(elf_bfd_h) $(gregset_h) $(gdbcore_h) $(gdbthread_h) $(gdb_stat_h) \
-	$(linux_fork_h) $(inf_loop_h) $(event_loop_h) $(event_top_h)
+	$(linux_fork_h) $(inf_loop_h) $(event_loop_h) $(event_top_h) \
+	$(observer_h)
 linux-thread-db.o: linux-thread-db.c $(defs_h) $(gdb_assert_h) \
 	$(gdb_proc_service_h) $(gdb_thread_db_h) $(bfd_h) $(exceptions_h) \
 	$(gdbthread_h) $(inferior_h) $(symfile_h) $(objfiles_h) $(target_h) \
diff --git a/gdb/doc/observer.texi b/gdb/doc/observer.texi
index 5bcc76c..af3835b 100644
--- a/gdb/doc/observer.texi
+++ b/gdb/doc/observer.texi
@@ -133,3 +133,7 @@ previously loaded symbol table data has now been invalidated.
 The thread specified by @var{t} has been created.
 @end deftypefun
 
+@deftypefun void thread_exit (struct thread_info *@var{t})
+The thread specified by @var{t} has exited.
+@end deftypefun
+
diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index 9511815..a97ad0f 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -49,6 +49,7 @@
 #include "inf-loop.h"
 #include "event-loop.h"
 #include "event-top.h"
+#include "observer.h"
 
 #ifndef O_LARGEFILE
 #define O_LARGEFILE 0
@@ -995,10 +996,13 @@ prune_lwps (void)
 static void
 exit_lwp (struct lwp_info *lp)
 {
-  if (in_thread_list (lp->ptid))
+  struct thread_info *th = find_thread_pid (lp->ptid);
+
+  if (th)
     {
       if (print_thread_events)
 	printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid));
+      observer_notify_thread_exit (th);
 
       /* Core GDB cannot deal with us deleting the current thread.  */
       if (!ptid_equal (lp->ptid, inferior_ptid))
diff --git a/gdb/mi/mi-interp.c b/gdb/mi/mi-interp.c
index 8dfd3ee..da7a717 100644
--- a/gdb/mi/mi-interp.c
+++ b/gdb/mi/mi-interp.c
@@ -67,6 +67,7 @@ static void mi_insert_notify_hooks (void);
 static void mi_remove_notify_hooks (void);
 
 static void mi_new_thread (struct thread_info *t);
+static void mi_thread_exit (struct thread_info *t);
 
 static void *
 mi_interpreter_init (int top_level)
@@ -88,7 +89,10 @@ mi_interpreter_init (int top_level)
   mi->event_channel = mi_console_file_new (raw_stdout, "=", 0);
 
   if (top_level)
-    observer_attach_new_thread (mi_new_thread);
+    {
+      observer_attach_new_thread (mi_new_thread);
+      observer_attach_thread_exit (mi_thread_exit);
+    }
 
   return mi;
 }
@@ -317,6 +321,16 @@ mi_new_thread (struct thread_info *t)
   gdb_flush (mi->event_channel);
 }
 
+static void
+mi_thread_exit (struct thread_info *t)
+{
+  struct mi_interp *mi = top_level_interpreter_data ();
+
+  target_terminal_ours ();
+  fprintf_unfiltered (mi->event_channel, "thread-exited,id=\"%d\"", t->num);
+  gdb_flush (mi->event_channel);
+}
+
 extern initialize_file_ftype _initialize_mi_interp; /* -Wmissing-prototypes */
 
 void
-- 
1.5.3.5