It's useful to set task/thread's name for debugging.
Under Linux, there is a prctl() system call to do that. Note that we don't
want to use pthread_setname_np since only very recent glibc (>= 2.12) provide
this function.
Tested on x86_64-pc-linux-gnu, committed on trunk
2012-03-07 Arnaud Charlet <[email protected]>
* s-osinte-linux.ads, s-taprop-linux.adb (prctl): New function.
(Enter_Task): Call prctl when relevant.
Index: s-osinte-linux.ads
===================================================================
--- s-osinte-linux.ads (revision 185051)
+++ s-osinte-linux.ads (working copy)
@@ -7,7 +7,7 @@
-- S p e c --
-- --
-- Copyright (C) 1991-1994, Florida State University --
--- Copyright (C) 1995-2011, Free Software Foundation, Inc. --
+-- Copyright (C) 1995-2012, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
@@ -255,6 +255,12 @@
function getpid return pid_t;
pragma Import (C, getpid, "getpid");
+ PR_SET_NAME : constant := 15;
+
+ function prctl
+ (option : int; arg2, arg3, arg4, arg5 : unsigned_long := 0) return int;
+ pragma Import (C, prctl);
+
-------------
-- Threads --
-------------
Index: s-taprop-linux.adb
===================================================================
--- s-taprop-linux.adb (revision 185051)
+++ s-taprop-linux.adb (working copy)
@@ -6,7 +6,7 @@
-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2011, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2012, Free Software Foundation, Inc. --
-- --
-- GNARL is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
@@ -767,6 +767,22 @@
Self_ID.Common.LL.Thread := pthread_self;
Self_ID.Common.LL.LWP := lwp_self;
+ if Self_ID.Common.Task_Image_Len > 0 then
+ declare
+ Task_Name : String (1 .. Parameters.Max_Task_Image_Length + 1);
+ Result : int;
+ begin
+ -- Set thread name to ease debugging
+
+ Task_Name (1 .. Self_ID.Common.Task_Image_Len) :=
+ Self_ID.Common.Task_Image (1 .. Self_ID.Common.Task_Image_Len);
+ Task_Name (Self_ID.Common.Task_Image_Len + 1) := ASCII.NUL;
+
+ Result := prctl (PR_SET_NAME, unsigned_long (Task_Name'Address));
+ pragma Assert (Result = 0);
+ end;
+ end if;
+
Specific.Set (Self_ID);
if Use_Alternate_Stack
