New debug function wait_for_debugger(). Useful when creating teams to be debugged via fork().

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@11634 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/kernel/debugger.h

@@ -27,6 +27,7 @@ extern status_t	install_default_debugger(port_id debuggerPort);
 extern port_id	install_team_debugger(team_id team, port_id debuggerPort);
 extern status_t	remove_team_debugger(team_id team);
 extern status_t	debug_thread(thread_id thread);
+extern void		wait_for_debugger(void);
 
 // team debugging flags
 enum {

src/kernel/libroot/os/debug.c

@@ -54,6 +54,22 @@ debug_thread(thread_id thread)
 	return _kern_debug_thread(thread);
 }
 
+
+/**	\brief Suspends the thread until a debugger has been installed for this
+ *		   team.
+ *
+ *	As soon as this happens (immediately, if a debugger is already installed)
+ *	the thread stops for debugging. This is desirable for debuggers that spawn
+ *	their debugged teams via fork() and want the child to wait till they have
+ *	installed themselves as team debugger before continuing with exec*().
+ */
+void
+wait_for_debugger(void)
+{
+	_kern_wait_for_debugger();
+}
+
+
 static const char *const sDebugWhyStrings[] = {
 	"Thread not running",		// B_THREAD_NOT_RUNNING
 	"Signal received",			// B_SIGNAL_RECEIVED