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comparison gcc/ada/libgnarl/s-taspri__mingw.ads @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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children 84e7813d76e9
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68:561a7518be6b 111:04ced10e8804
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT 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) 1991-2017, Free Software Foundation, Inc. --
10 -- --
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 3, 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. --
17 -- --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
21 -- --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
26 -- --
27 -- GNARL was developed by the GNARL team at Florida State University. --
28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
29 -- --
30 ------------------------------------------------------------------------------
31
32 -- This is a NT (native) version of this package
33
34 pragma Polling (Off);
35 -- Turn off polling, we do not want ATC polling to take place during tasking
36 -- operations. It causes infinite loops and other problems.
37
38 with System.OS_Interface;
39 with System.Win32;
40
41 package System.Task_Primitives is
42 pragma Preelaborate;
43
44 type Lock is limited private;
45 -- Should be used for implementation of protected objects
46
47 type RTS_Lock is limited private;
48 -- Should be used inside the runtime system. The difference between Lock
49 -- and the RTS_Lock is that the later one serves only as a semaphore so
50 -- that do not check for ceiling violations.
51
52 type Suspension_Object is limited private;
53 -- Should be used for the implementation of Ada.Synchronous_Task_Control
54
55 type Task_Body_Access is access procedure;
56 -- Pointer to the task body's entry point (or possibly a wrapper
57 -- declared local to the GNARL).
58
59 type Private_Data is limited private;
60 -- Any information that the GNULLI needs maintained on a per-task basis.
61 -- A component of this type is guaranteed to be included in the
62 -- Ada_Task_Control_Block.
63
64 subtype Task_Address is System.Address;
65 Task_Address_Size : constant := Standard'Address_Size;
66 -- Type used for task addresses and its size
67
68 Alternate_Stack_Size : constant := 0;
69 -- No alternate signal stack is used on this platform
70
71 private
72
73 type Lock is record
74 Mutex : aliased System.OS_Interface.CRITICAL_SECTION;
75 Priority : Integer;
76 Owner_Priority : Integer;
77 end record;
78
79 type Condition_Variable is new System.Win32.HANDLE;
80
81 type RTS_Lock is new System.OS_Interface.CRITICAL_SECTION;
82
83 type Suspension_Object is record
84 State : Boolean;
85 pragma Atomic (State);
86 -- Boolean that indicates whether the object is open. This field is
87 -- marked Atomic to ensure that we can read its value without locking
88 -- the access to the Suspension_Object.
89
90 Waiting : Boolean;
91 -- Flag showing if there is a task already suspended on this object
92
93 L : aliased System.OS_Interface.CRITICAL_SECTION;
94 -- Protection for ensuring mutual exclusion on the Suspension_Object
95
96 CV : aliased Win32.HANDLE;
97 -- Condition variable used to queue threads until condition is signaled
98 end record;
99
100 type Private_Data is limited record
101 Thread : aliased Win32.HANDLE;
102 pragma Atomic (Thread);
103 -- Thread field may be updated by two different threads of control.
104 -- (See, Enter_Task and Create_Task in s-taprop.adb).
105 -- They put the same value (thr_self value). We do not want to
106 -- use lock on those operations and the only thing we have to
107 -- make sure is that they are updated in atomic fashion.
108
109 Thread_Id : aliased Win32.DWORD;
110 -- Used to provide a better tasking support in gdb
111
112 CV : aliased Condition_Variable;
113 -- Condition Variable used to implement Sleep/Wakeup
114
115 L : aliased RTS_Lock;
116 -- Protection for all components is lock L
117 end record;
118
119 end System.Task_Primitives;