1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . P R O G R A M _ I N F O --
9 -- Copyright (C) 1997 Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
33 -- This package contains the definitions and routines used as parameters
34 -- to the run-time system at program startup for the SGI implementation.
36 package System
.Program_Info
is
38 function Initial_Sproc_Count
return Integer;
40 -- The number of sproc created at program startup for scheduling
44 function Max_Sproc_Count
return Integer;
46 -- The maximum number of sprocs that can be created by the program
47 -- for servicing threads. This limit includes both the pre-created
48 -- sprocs and those explicitly created under program control.
51 function Sproc_Stack_Size
return Integer;
53 -- The size, in bytes, of the sproc's initial stack.
56 function Default_Time_Slice
return Duration;
58 -- The default time quanta for round-robin scheduling of threads of
59 -- equal priority. This default value can be overridden on a per-task
60 -- basis by specifying an alternate value via the implementation-defined
61 -- Task_Info pragma. See s-tasinf.ads for more information.
64 function Default_Task_Stack
return Integer;
66 -- The default stack size for each created thread. This default value
67 -- can be overriden on a per-task basis by the language-defined
68 -- Storage_Size pragma.
71 function Stack_Guard_Pages
return Integer;
73 -- The number of non-writable, guard pages to append to the bottom of
74 -- each thread's stack.
77 function Pthread_Sched_Signal
return Integer;
79 -- The signal used by the Pthreads library to affect scheduling actions
83 function Pthread_Arena_Size
return Integer;
85 -- The size of the shared arena from which pthread locks are allocated.
86 -- See the usinit(3p) man page for more information on shared arenas.
89 function Os_Default_Priority
return Integer;
91 -- The default Irix Non-Degrading priority for each sproc created to
95 end System
.Program_Info
;