summaryrefslogtreecommitdiff
path: root/gcc/ada/s-osprim-vms.adb
blob: 93138414571f7fb71a0d6e5a53241e82d6e82bec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
------------------------------------------------------------------------------
--                                                                          --
--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
--                                                                          --
--                  S Y S T E M . O S _ P R I M I T I V E S                 --
--                                                                          --
--                                  B o d y                                 --
--                                                                          --
--          Copyright (C) 1998-2007, Free Software Foundation, Inc.         --
--                                                                          --
-- GNARL is free software; you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNARL; see file COPYING.  If not, write --
-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
-- Boston, MA 02110-1301, USA.                                              --
--                                                                          --
-- As a special exception,  if other files  instantiate  generics from this --
-- unit, or you link  this unit with other files  to produce an executable, --
-- this  unit  does not  by itself cause  the resulting  executable  to  be --
-- covered  by the  GNU  General  Public  License.  This exception does not --
-- however invalidate  any other reasons why  the executable file  might be --
-- covered by the  GNU Public License.                                      --
--                                                                          --
-- GNARL was developed by the GNARL team at Florida State University.       --
-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
--                                                                          --
------------------------------------------------------------------------------

--  This is the OpenVMS/Alpha version of this file

with System.Aux_DEC;

package body System.OS_Primitives is

   --------------------------------------
   -- Local functions and declarations --
   --------------------------------------

   function Get_GMToff return Integer;
   pragma Import (C, Get_GMToff, "get_gmtoff");
   --  Get the offset from GMT for this timezone

   function VMS_Epoch_Offset return Long_Integer;
   pragma Inline (VMS_Epoch_Offset);
   --  The offset between the Unix Epoch and the VMS Epoch

   subtype Cond_Value_Type is System.Aux_DEC.Unsigned_Longword;
   --  Condition Value return type

   ----------------------
   -- VMS_Epoch_Offset --
   ----------------------

   function VMS_Epoch_Offset return Long_Integer is
   begin
      return 10_000_000 * (3_506_716_800 + Long_Integer (Get_GMToff));
   end VMS_Epoch_Offset;

   ----------------
   -- Sys_Schdwk --
   ----------------
   --
   --  Schedule Wakeup
   --
   --  status = returned status
   --  pidadr = address of process id to be woken up
   --  prcnam = name of process to be woken up
   --  daytim = time to wake up
   --  reptim = repetition interval of wakeup calls
   --

   procedure Sys_Schdwk
     (
      Status : out Cond_Value_Type;
      Pidadr : Address := Null_Address;
      Prcnam : String := String'Null_Parameter;
      Daytim : Long_Integer;
      Reptim : Long_Integer := Long_Integer'Null_Parameter
     );

   pragma Interface (External, Sys_Schdwk);
   --  VMS system call to schedule a wakeup event
   pragma Import_Valued_Procedure
     (Sys_Schdwk, "SYS$SCHDWK",
      (Cond_Value_Type, Address, String,         Long_Integer, Long_Integer),
      (Value,           Value,   Descriptor (S), Reference,    Reference)
     );

   ----------------
   -- Sys_Gettim --
   ----------------
   --
   --  Get System Time
   --
   --  status = returned status
   --  tim    = current system time
   --

   procedure Sys_Gettim
     (
      Status : out Cond_Value_Type;
      Tim    : out OS_Time
     );
   --  VMS system call to get the current system time
   pragma Interface (External, Sys_Gettim);
   pragma Import_Valued_Procedure
     (Sys_Gettim, "SYS$GETTIM",
      (Cond_Value_Type, OS_Time),
      (Value,           Reference)
     );

   ---------------
   -- Sys_Hiber --
   ---------------

   --  Hibernate (until woken up)

   --  status = returned status

   procedure Sys_Hiber (Status : out Cond_Value_Type);
   --  VMS system call to hibernate the current process
   pragma Interface (External, Sys_Hiber);
   pragma Import_Valued_Procedure
     (Sys_Hiber, "SYS$HIBER",
      (Cond_Value_Type),
      (Value)
     );

   -----------
   -- Clock --
   -----------

   function OS_Clock return OS_Time is
      Status : Cond_Value_Type;
      T      : OS_Time;
   begin
      Sys_Gettim (Status, T);
      return (T);
   end OS_Clock;

   -----------
   -- Clock --
   -----------

   function Clock return Duration is
   begin
      return To_Duration (OS_Clock, Absolute_Calendar);
   end Clock;

   ----------------
   -- Initialize --
   ----------------

   procedure Initialize is
   begin
      null;
   end Initialize;

   ---------------------
   -- Monotonic_Clock --
   ---------------------

   function Monotonic_Clock return Duration renames Clock;

   -----------------
   -- Timed_Delay --
   -----------------

   procedure Timed_Delay
     (Time : Duration;
      Mode : Integer)
   is
      Sleep_Time : OS_Time;
      Status     : Cond_Value_Type;
      pragma Unreferenced (Status);

   begin
      Sleep_Time := To_OS_Time (Time, Mode);
      Sys_Schdwk (Status => Status, Daytim => Sleep_Time);
      Sys_Hiber (Status);
   end Timed_Delay;

   -----------------
   -- To_Duration --
   -----------------

   function To_Duration (T : OS_Time; Mode : Integer) return Duration is
      pragma Warnings (Off, Mode);
   begin
      return Duration'Fixed_Value (T - VMS_Epoch_Offset) * 100;
   end To_Duration;

   ----------------
   -- To_OS_Time --
   ----------------

   function To_OS_Time (D : Duration; Mode : Integer) return OS_Time is
   begin
      if Mode = Relative then
         return -(Long_Integer'Integer_Value (D) / 100);
      else
         return Long_Integer'Integer_Value (D) / 100 + VMS_Epoch_Offset;
      end if;
   end To_OS_Time;

end System.OS_Primitives;