PR target/16201
[official-gcc.git] / gcc / ada / s-taspri-lynxos.ads
blobbf079fd34a30df61001492bdf18a7c58e78c35e3
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
4 -- --
5 -- S Y S T E M . T A S K _ P R I M I T I V E S --
6 -- --
7 -- S p e c --
8 -- --
9 -- Copyright (C) 1991-1994, Florida State University --
10 -- Copyright (C) 1995-2003, Ada Core Technologies --
11 -- --
12 -- GNARL is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNARL; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
22 -- --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
29 -- --
30 -- GNARL was developed by the GNARL team at Florida State University. --
31 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 -- --
33 ------------------------------------------------------------------------------
35 -- This is a LynxOS version of this package, derived from
36 -- 7staspri.ads
38 pragma Polling (Off);
39 -- Turn off polling, we do not want ATC polling to take place during
40 -- tasking operations. It causes infinite loops and other problems.
42 with System.OS_Interface;
43 -- used for pthread_mutex_t
44 -- pthread_cond_t
45 -- pthread_t
47 package System.Task_Primitives is
49 type Lock is limited private;
50 -- Should be used for implementation of protected objects.
52 type RTS_Lock is limited private;
53 -- Should be used inside the runtime system.
54 -- The difference between Lock and the RTS_Lock is that the later
55 -- one serves only as a semaphore so that do not check for
56 -- ceiling violations.
58 type Task_Body_Access is access procedure;
59 -- Pointer to the task body's entry point (or possibly a wrapper
60 -- declared local to the GNARL).
62 type Private_Data is limited private;
63 -- Any information that the GNULLI needs maintained on a per-task
64 -- basis. A component of this type is guaranteed to be included
65 -- in the Ada_Task_Control_Block.
67 private
69 type Lock is record
70 Mutex : aliased System.OS_Interface.pthread_mutex_t;
71 Ceiling : System.Any_Priority;
72 Saved_Priority : System.Any_Priority;
73 end record;
75 type RTS_Lock is new System.OS_Interface.pthread_mutex_t;
77 type Private_Data is record
78 Thread : aliased System.OS_Interface.pthread_t;
79 pragma Atomic (Thread);
80 -- Thread field may be updated by two different threads of control.
81 -- (See, Enter_Task and Create_Task in s-taprop.adb).
82 -- They put the same value (thr_self value). We do not want to
83 -- use lock on those operations and the only thing we have to
84 -- make sure is that they are updated in atomic fashion.
86 LWP : aliased System.Address;
87 -- The purpose of this field is to provide a better tasking support on
88 -- gdb. The order of the two first fields (Thread and LWP) is important.
89 -- On targets where lwp is not relevant, this is equivalent to Thread.
91 CV : aliased System.OS_Interface.pthread_cond_t;
93 L : aliased RTS_Lock;
94 -- Protection for all components is lock L
95 end record;
97 end System.Task_Primitives;