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comparison gcc/ada/libgnarl/s-tpopsp__vxworks.adb @ 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 -- SYSTEM.TASK_PRIMITIVES.OPERATIONS.SPECIFIC --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2017, 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 VxWorks version of this package where foreign threads are
33 -- recognized. The implementation is based on VxWorks taskVarLib.
34
35 separate (System.Task_Primitives.Operations)
36 package body Specific is
37
38 ATCB_Key : aliased System.Address := System.Null_Address;
39 -- Key used to find the Ada Task_Id associated with a thread
40
41 ATCB_Key_Addr : System.Address := ATCB_Key'Address;
42 pragma Export (Ada, ATCB_Key_Addr, "__gnat_ATCB_key_addr");
43 -- Exported to support the temporary AE653 task registration
44 -- implementation. This mechanism is used to minimize impact on other
45 -- targets.
46
47 Stack_Limit : aliased System.Address;
48
49 pragma Import (C, Stack_Limit, "__gnat_stack_limit");
50
51 type Set_Stack_Limit_Proc_Acc is access procedure;
52 pragma Convention (C, Set_Stack_Limit_Proc_Acc);
53
54 Set_Stack_Limit_Hook : Set_Stack_Limit_Proc_Acc;
55 pragma Import (C, Set_Stack_Limit_Hook, "__gnat_set_stack_limit_hook");
56 -- Procedure to be called when a task is created to set stack limit if
57 -- limit checking is used.
58
59 ----------------
60 -- Initialize --
61 ----------------
62
63 procedure Initialize is
64 begin
65 null;
66 end Initialize;
67
68 -------------------
69 -- Is_Valid_Task --
70 -------------------
71
72 function Is_Valid_Task return Boolean is
73 begin
74 return taskVarGet (taskIdSelf, ATCB_Key'Access) /= ERROR;
75 end Is_Valid_Task;
76
77 ---------
78 -- Set --
79 ---------
80
81 procedure Set (Self_Id : Task_Id) is
82 Result : STATUS;
83
84 begin
85 -- If argument is null, destroy task specific data, to make API
86 -- consistent with other platforms, and thus compatible with the
87 -- shared version of s-tpoaal.adb.
88
89 if Self_Id = null then
90 Result := taskVarDelete (taskIdSelf, ATCB_Key'Access);
91 pragma Assert (Result /= ERROR);
92 return;
93 end if;
94
95 if not Is_Valid_Task then
96 Result := taskVarAdd (Self_Id.Common.LL.Thread, ATCB_Key'Access);
97 pragma Assert (Result = OK);
98
99 if Stack_Check_Limits
100 and then Result /= ERROR
101 and then Set_Stack_Limit_Hook /= null
102 then
103 -- This will be initialized from taskInfoGet() once the task is
104 -- is running.
105
106 Result :=
107 taskVarAdd (Self_Id.Common.LL.Thread, Stack_Limit'Access);
108 pragma Assert (Result /= ERROR);
109 end if;
110 end if;
111
112 Result :=
113 taskVarSet
114 (Self_Id.Common.LL.Thread,
115 ATCB_Key'Access,
116 To_Address (Self_Id));
117 pragma Assert (Result /= ERROR);
118 end Set;
119
120 ----------
121 -- Self --
122 ----------
123
124 -- To make Ada tasks and C threads interoperate better, we have added some
125 -- functionality to Self. Suppose a C main program (with threads) calls an
126 -- Ada procedure and the Ada procedure calls the tasking runtime system.
127 -- Eventually, a call will be made to self. Since the call is not coming
128 -- from an Ada task, there will be no corresponding ATCB.
129
130 -- What we do in Self is to catch references that do not come from
131 -- recognized Ada tasks, and create an ATCB for the calling thread.
132
133 -- The new ATCB will be "detached" from the normal Ada task master
134 -- hierarchy, much like the existing implicitly created signal-server
135 -- tasks.
136
137 function Self return Task_Id is
138 Result : constant Task_Id := To_Task_Id (ATCB_Key);
139 begin
140 if Result /= null then
141 return Result;
142 else
143 -- If the value is Null then it is a non-Ada task
144
145 return Register_Foreign_Thread;
146 end if;
147 end Self;
148
149 end Specific;