1 ------------------------------------------------------------------------------
3 -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- S Y S T E M . T A S K _ P R I M I T I V E S --
9 -- Copyright (C) 2001-2002 Free Software Foundation, Inc. --
11 -- GNARL 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. GNARL 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 GNARL; 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 -- GNARL was developed by the GNARL team at Florida State University. --
30 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 ------------------------------------------------------------------------------
34 -- This is a VxWorks version of this package.
37 -- Turn off polling, we do not want ATC polling to take place during
38 -- tasking operations. It causes infinite loops and other problems.
40 with System
.OS_Interface
;
42 package System
.Task_Primitives
is
44 type Lock
is limited private;
45 -- Should be used for implementation of protected objects.
47 type RTS_Lock
is limited private;
48 -- Should be used inside the runtime system.
49 -- The difference between Lock and the RTS_Lock is that the later
50 -- one serves only as a semaphore so that do not check for
51 -- ceiling violations.
53 type Task_Body_Access
is access procedure;
54 -- Pointer to the task body's entry point (or possibly a wrapper
55 -- declared local to the GNARL).
57 type Private_Data
is limited private;
58 -- Any information that the GNULLI needs maintained on a per-task
59 -- basis. A component of this type is guaranteed to be included
60 -- in the Ada_Task_Control_Block.
64 type Priority_Type
is (Prio_None
, Prio_Protect
, Prio_Inherit
);
67 Mutex
: System
.OS_Interface
.SEM_ID
;
68 Protocol
: Priority_Type
;
69 Prio_Ceiling
: System
.OS_Interface
.int
;
70 -- priority ceiling of lock
73 type RTS_Lock
is new Lock
;
75 type Private_Data
is record
76 Thread
: aliased System
.OS_Interface
.t_id
:= 0;
77 pragma Atomic
(Thread
);
78 -- Thread field may be updated by two different threads of control.
79 -- (See, Enter_Task and Create_Task in s-taprop.adb).
80 -- They put the same value (thr_self value). We do not want to
81 -- use lock on those operations and the only thing we have to
82 -- make sure is that they are updated in atomic fashion.
84 LWP
: aliased System
.Address
;
85 -- The purpose of this field is to provide a better tasking support on
86 -- gdb. The order of the two first fields (Thread and LWP) is important.
87 -- On targets where lwp is not relevant, this is equivalent to Thread.
89 CV
: aliased System
.OS_Interface
.SEM_ID
;
92 -- Protection for all components is lock L
95 end System
.Task_Primitives
;