Implement MI notification for new threads.

* doc/observer.texi (new_thread): Document.
        * observer.sh: Forward declare struct thread_info.
        * thread.c (add_thread): Notify observer.

        * interps.h (interp_init_ftype): New parameter
        top_level.
        (interp_set): Likewise.
        (top_level_interpreter_data): Declare.
        * interps.c (interp_set): New parameter top_level.
        Pass it to interpreter's init function.  Remember
        top level interpreter.
        (interpreter_exec_cmd): Adjust.
        (top_level_interpreter_data): New.
        * main.c (captured_main): Pass 1 for top_level
        parameter of interp_set.
	* cli/cli-interp.c (cli_interpreter_init): New
        parameter top_level.
        * tui/tui-interp.c (tui_init): New parameter top_level.

        * mi/mi-interp.c (mi_new_thread): New.
        (mi_interpreter_init): If top level, register
        observer for new threads.

        * Makefile.in (mi-interp.o, thread.o): Update dependencies.

gdb/ChangeLog

@@ -1,3 +1,31 @@
+2008-03-14  Vladimir Prus  <vladimir@codesourcery.com>
+
+	Implement MI notification for new threads.
+        * doc/observer.texi (new_thread): Document.
+        * observer.sh: Forward declare struct thread_info.
+        * thread.c (add_thread): Notify observer.
+
+        * interps.h (interp_init_ftype): New parameter
+        top_level.
+        (interp_set): Likewise.
+        (top_level_interpreter_data): Declare.
+        * interps.c (interp_set): New parameter top_level.
+        Pass it to interpreter's init function.  Remember
+        top level interpreter.
+        (interpreter_exec_cmd): Adjust.
+        (top_level_interpreter_data): New.
+        * main.c (captured_main): Pass 1 for top_level
+        parameter of interp_set.
+	* cli/cli-interp.c (cli_interpreter_init): New
+        parameter top_level.
+        * tui/tui-interp.c (tui_init): New parameter top_level.
+
+        * mi/mi-interp.c (mi_new_thread): New.
+        (mi_interpreter_init): If top level, register
+        observer for new threads.
+
+        * Makefile.in (mi-interp.o, thread.o): Update dependencies.
+
 2008-03-14  Pedro Alves  <pedro@codesourcery.com>
 
 	* top.c (execute_command): Disable break and stop

gdb/Makefile.in

@@ -2883,7 +2883,7 @@ target-memory.o: target-memory.c $(defs_h) $(vec_h) $(target_h) \
 thread.o: thread.c $(defs_h) $(symtab_h) $(frame_h) $(inferior_h) \
 	$(environ_h) $(value_h) $(target_h) $(gdbthread_h) $(exceptions_h) \
 	$(command_h) $(gdbcmd_h) $(regcache_h) $(gdb_h) $(gdb_string_h) \
-	$(ui_out_h)
+	$(ui_out_h) $(observer_h)
 top.o: top.c $(defs_h) $(gdbcmd_h) $(call_cmds_h) $(cli_cmds_h) \
 	$(cli_script_h) $(cli_setshow_h) $(cli_decode_h) $(symtab_h) \
 	$(inferior_h) $(exceptions_h) $(target_h) $(breakpoint_h) \
@@ -3228,7 +3228,7 @@ mi-getopt.o: $(srcdir)/mi/mi-getopt.c $(defs_h) $(mi_getopt_h) \
 mi-interp.o: $(srcdir)/mi/mi-interp.c $(defs_h) $(gdb_string_h) $(interps_h) \
 	$(event_top_h) $(event_loop_h) $(inferior_h) $(ui_out_h) $(top_h) \
 	$(exceptions_h) $(mi_main_h) $(mi_cmds_h) $(mi_out_h) \
-	$(mi_console_h)
+	$(mi_console_h) $(observer_h) $(gdbthread_h)
 	$(CC) -c $(INTERNAL_CFLAGS) $(srcdir)/mi/mi-interp.c
 mi-main.o: $(srcdir)/mi/mi-main.c $(defs_h) $(target_h) $(inferior_h) \
 	$(gdb_string_h) $(exceptions_h) $(top_h) $(gdbthread_h) $(mi_cmds_h) \

gdb/cli/cli-interp.c

@@ -43,7 +43,7 @@ struct captured_execute_command_args
 /* These implement the cli out interpreter: */
 
 static void *
-cli_interpreter_init (void)
+cli_interpreter_init (int top_level)
 {
   return NULL;
 }

gdb/doc/observer.texi

@@ -129,3 +129,7 @@ Called with @var{objfile} equal to @code{NULL} to indicate
 previously loaded symbol table data has now been invalidated.
 @end deftypefun
 
+@deftypefun void new_thread (struct thread_info *@var{t})
+The thread specified by @var{t} has been created.
+@end deftypefun
+

gdb/interps.c

@@ -81,6 +81,7 @@ void _initialize_interpreter (void);
 
 static struct interp *interp_list = NULL;
 static struct interp *current_interpreter = NULL;
+static struct interp *top_level_interpreter = NULL;
 
 static int interpreter_initialized = 0;
 
@@ -124,16 +125,27 @@ interp_add (struct interp *interp)
    init proc is successful, return 1, if it fails, set the old
    interpreter back in place and return 0.  If we can't restore the
    old interpreter, then raise an internal error, since we are in
-   pretty bad shape at this point. */
+   pretty bad shape at this point. 
+
+   The TOP_LEVEL parameter tells if this new interpreter is
+   the top-level one.  The top-level is what is requested
+   on the command line, and is responsible for reporting general
+   notification about target state changes.  For example, if
+   MI is the top-level interpreter, then it will always report
+   events such as target stops and new thread creation, even if they
+   are caused by CLI commands.  */
 int
-interp_set (struct interp *interp)
+interp_set (struct interp *interp, int top_level)
 {
   struct interp *old_interp = current_interpreter;
   int first_time = 0;
-
-
   char buffer[64];
 
+  /* If we already have an interpreter, then trying to
+     set top level interpreter is kinda pointless.  */
+  gdb_assert (!top_level || !current_interpreter);
+  gdb_assert (!top_level || !top_level_interpreter);
+
   if (current_interpreter != NULL)
     {
       do_all_continuations ();
@@ -152,6 +164,8 @@ interp_set (struct interp *interp)
     }
 
   current_interpreter = interp;
+  if (top_level)
+    top_level_interpreter = interp;
 
   /* We use interpreter_p for the "set interpreter" variable, so we need
      to make sure we have a malloc'ed copy for the set command to free. */
@@ -171,7 +185,7 @@ interp_set (struct interp *interp)
     {
       if (interp->procs->init_proc != NULL)
 	{
-	  interp->data = interp->procs->init_proc ();
+	  interp->data = interp->procs->init_proc (top_level);
 	}
       interp->inited = 1;
     }
@@ -182,7 +196,7 @@ interp_set (struct interp *interp)
   if (interp->procs->resume_proc != NULL
       && (!interp->procs->resume_proc (interp->data)))
     {
-      if (old_interp == NULL || !interp_set (old_interp))
+      if (old_interp == NULL || !interp_set (old_interp, 0))
 	internal_error (__FILE__, __LINE__,
 			_("Failed to initialize new interp \"%s\" %s"),
 			interp->name, "and could not restore old interp!\n");
@@ -390,7 +404,7 @@ interpreter_exec_cmd (char *args, int from_tty)
   old_quiet = interp_set_quiet (old_interp, 1);
   use_quiet = interp_set_quiet (interp_to_use, 1);
 
-  if (!interp_set (interp_to_use))
+  if (!interp_set (interp_to_use, 0))
     error (_("Could not switch to interpreter \"%s\"."), prules[0]);
 
   for (i = 1; i < nrules; i++)
@@ -398,14 +412,14 @@ interpreter_exec_cmd (char *args, int from_tty)
       struct gdb_exception e = interp_exec (interp_to_use, prules[i]);
       if (e.reason < 0)
 	{
-	  interp_set (old_interp);
+	  interp_set (old_interp, 0);
 	  interp_set_quiet (interp_to_use, use_quiet);
 	  interp_set_quiet (old_interp, old_quiet);
 	  error (_("error in command: \"%s\"."), prules[i]);
 	}
     }
 
-  interp_set (old_interp);
+  interp_set (old_interp, 0);
   interp_set_quiet (interp_to_use, use_quiet);
   interp_set_quiet (old_interp, old_quiet);
 }
@@ -462,6 +476,13 @@ interpreter_completer (char *text, char *word)
   return matches;
 }
 
+extern void *
+top_level_interpreter_data (void)
+{
+  gdb_assert (top_level_interpreter);
+  return top_level_interpreter->data;  
+}
+
 /* This just adds the "interpreter-exec" command.  */
 void
 _initialize_interpreter (void)

gdb/interps.h

@@ -35,7 +35,7 @@ extern struct gdb_exception interp_exec (struct interp *interp,
 					 const char *command);
 extern int interp_quiet_p (struct interp *interp);
 
-typedef void *(interp_init_ftype) (void);
+typedef void *(interp_init_ftype) (int top_level);
 typedef int (interp_resume_ftype) (void *data);
 typedef int (interp_suspend_ftype) (void *data);
 typedef int (interp_prompt_p_ftype) (void *data);
@@ -57,13 +57,15 @@ extern struct interp *interp_new (const char *name, void *data,
 				  struct ui_out *uiout,
 				  const struct interp_procs *procs);
 extern void interp_add (struct interp *interp);
-extern int interp_set (struct interp *interp);
+extern int interp_set (struct interp *interp, int top_level);
 extern struct interp *interp_lookup (const char *name);
 extern struct ui_out *interp_ui_out (struct interp *interp);
 
 extern int current_interp_named_p (const char *name);
 extern int current_interp_display_prompt_p (void);
 extern void current_interp_command_loop (void);
+/* Returns opaque data associated with the top-level interpreter.  */
+extern void *top_level_interpreter_data (void);
 
 extern void clear_interpreter_hooks (void);
 

gdb/main.c

@@ -649,7 +649,7 @@ Excess command line arguments ignored. (%s%s)\n"),
     if (interp == NULL)
       error (_("Interpreter `%s' unrecognized"), interpreter_p);
     /* Install it.  */
-    if (!interp_set (interp))
+    if (!interp_set (interp, 1))
       {
         fprintf_unfiltered (gdb_stderr,
 			    "Interpreter `%s' failed to initialize.\n",

gdb/mi/mi-interp.c

@@ -31,6 +31,8 @@
 #include "mi-cmds.h"
 #include "mi-out.h"
 #include "mi-console.h"
+#include "observer.h"
+#include "gdbthread.h"
 
 struct mi_interp
 {
@@ -64,8 +66,10 @@ static void mi1_command_loop (void);
 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_interpreter_init (void)
+mi_interpreter_init (int top_level)
 {
   struct mi_interp *mi = XMALLOC (struct mi_interp);
 
@@ -83,6 +87,9 @@ mi_interpreter_init (void)
   mi->targ = mi_console_file_new (raw_stdout, "@", '"');
   mi->event_channel = mi_console_file_new (raw_stdout, "=", 0);
 
+  if (top_level)
+    observer_attach_new_thread (mi_new_thread);
+
   return mi;
 }
 
@@ -314,6 +321,15 @@ mi_command_loop (int mi_version)
   start_event_loop ();
 }
 
+static void
+mi_new_thread (struct thread_info *t)
+{
+  struct mi_interp *mi = top_level_interpreter_data ();
+
+  fprintf_unfiltered (mi->event_channel, "thread-created,id=%d", t->num);
+  gdb_flush (mi->event_channel);
+}
+
 extern initialize_file_ftype _initialize_mi_interp; /* -Wmissing-prototypes */
 
 void

gdb/observer.sh

@@ -62,6 +62,7 @@ struct observer;
 struct bpstats;
 struct so_list;
 struct objfile;
+struct thread_info;
 EOF
         ;;
 esac

gdb/thread.c

@@ -39,6 +39,7 @@
 #include <sys/types.h>
 #include <signal.h>
 #include "ui-out.h"
+#include "observer.h"
 
 /* Definition of struct thread_info exported to gdbthread.h */
 
@@ -137,6 +138,8 @@ add_thread (ptid_t ptid)
 
   if (print_thread_events)
     printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid));
+
+  observer_notify_new_thread (result);
   
   return result;
 }

gdb/tui/tui-interp.c

@@ -48,7 +48,7 @@ tui_exit (void)
 /* These implement the TUI interpreter.  */
 
 static void *
-tui_init (void)
+tui_init (int top_level)
 {
   /* Install exit handler to leave the screen in a good shape.  */
   atexit (tui_exit);