2008-11-22  Michael Snyder  <msnyder@promb-2s-dhcp151.eng.vmware.com>

	* thread.c (info_threads_command): Parse arguments for optional
	list (or range) of threads to which the command shall apply.
	(_initialize_thread): Explain extension in help string.

2008-11-22  Michael Snyder  <msnyder@promb-2s-dhcp151.eng.vmware.com>

	* gdb.texinfo (Debugging Programs with Multiple Threads):
	Document new optional argument to "info threads" command.

Index: thread.c
===================================================================
RCS file: /cvs/src/src/gdb/thread.c,v
retrieving revision 1.98
diff -u -p -r1.98 thread.c
--- thread.c	17 Nov 2008 12:13:49 -0000	1.98
+++ thread.c	23 Nov 2008 02:11:22 -0000
@@ -752,7 +752,34 @@ The current thread <Thread ID %d> has te
 static void
 info_threads_command (char *arg, int from_tty)
 {
-  print_thread_info (uiout, -1, -1);
+  char *p = arg;
+  char *p1;
+  int num, match;
+  struct thread_info *tp;
+
+  if (p == NULL)
+    print_thread_info (uiout, -1, -1);
+  else
+    while (*p)
+      {
+	match = 0;
+	p1 = p;
+	num = get_number_or_range (&p1);
+	if (num == 0)
+	  warning (_("bad thread number at or near '%s'"), p);
+	else
+	  {
+	    for (tp = thread_list; tp; tp = tp->next)
+	      if (num == tp->num)
+		{
+		  match = 1;
+		  print_thread_info (uiout, num, -1);
+		}
+	    if (match == 0)
+	      printf_unfiltered (_("No thread number %d.\n"), num);
+	  }
+	p = p1;
+      }
 }
 
 /* Switch from one thread to another. */
@@ -1116,7 +1143,7 @@ _initialize_thread (void)
   struct cmd_list_element *c;
 
   c = add_info ("threads", info_threads_command,
-		_("IDs of currently known threads."));
+		_("IDs of currently known threads, or optionally specified threads."));
   set_cmd_no_selected_thread_ok (c);
 
   c = add_prefix_cmd ("thread", class_run, thread_command, _("\
Index: doc/gdb.texinfo
===================================================================
RCS file: /cvs/src/src/gdb/doc/gdb.texinfo,v
retrieving revision 1.536
diff -u -p -r1.536 gdb.texinfo
--- doc/gdb.texinfo	22 Nov 2008 12:14:33 -0000	1.536
+++ doc/gdb.texinfo	23 Nov 2008 02:11:23 -0000
@@ -2491,9 +2491,11 @@ number---always a single integer---with 
 
 @table @code
 @kindex info threads
-@item info threads
-Display a summary of all threads currently in your
-program.  @value{GDBN} displays for each thread (in this order):
+@item info threads @r{[}@var{threads}@r{]} @r{[}@var{range}@dots{}@r{]}
+Display a summary of all threads currently in your program.  
+Optional argument means display information only
+about the specified threads or range of threads.
+@value{GDBN} displays for each thread (in this order):
 
 @enumerate
 @item