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
|
------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . O S _ I N T E R F A C E --
-- --
-- B o d y --
-- --
-- Copyright (C) 1997-2006 Free Software Foundation --
-- --
-- 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 VxWorks version.
-- This package encapsulates all direct interfaces to OS services
-- that are needed by children of System.
pragma Polling (Off);
-- Turn off polling, we do not want ATC polling to take place during
-- tasking operations. It causes infinite loops and other problems.
package body System.OS_Interface is
use type Interfaces.C.int;
Low_Priority : constant := 255;
-- VxWorks native (default) lowest scheduling priority.
------------
-- getpid --
------------
function getpid return t_id is
begin
-- VxWorks 5 (and VxWorks 6 in kernel mode) does not have a getpid
-- function. taskIdSelf is the equivalent routine.
return taskIdSelf;
end getpid;
----------
-- kill --
----------
function kill (pid : t_id; sig : Signal) return int is
function c_kill (pid : t_id; sig : Signal) return int;
pragma Import (C, c_kill, "kill");
begin
return c_kill (pid, sig);
end kill;
--------------------
-- Set_Time_Slice --
--------------------
function Set_Time_Slice (ticks : int) return int is
function kernelTimeSlice (ticks : int) return int;
pragma Import (C, kernelTimeSlice, "kernelTimeSlice");
begin
return kernelTimeSlice (ticks);
end Set_Time_Slice;
-------------
-- sigwait --
-------------
function sigwait
(set : access sigset_t;
sig : access Signal) return int
is
Result : int;
function sigwaitinfo
(set : access sigset_t; sigvalue : System.Address) return int;
pragma Import (C, sigwaitinfo, "sigwaitinfo");
begin
Result := sigwaitinfo (set, System.Null_Address);
if Result /= -1 then
sig.all := Signal (Result);
return 0;
else
sig.all := 0;
return errno;
end if;
end sigwait;
-----------------
-- To_Duration --
-----------------
function To_Duration (TS : timespec) return Duration is
begin
return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;
end To_Duration;
-----------------
-- To_Timespec --
-----------------
function To_Timespec (D : Duration) return timespec is
S : time_t;
F : Duration;
begin
S := time_t (Long_Long_Integer (D));
F := D - Duration (S);
-- If F has negative value due to a round-up, adjust for positive F
-- value.
if F < 0.0 then
S := S - 1;
F := F + 1.0;
end if;
return timespec'(ts_sec => S,
ts_nsec => long (Long_Long_Integer (F * 10#1#E9)));
end To_Timespec;
-------------------------
-- To_VxWorks_Priority --
-------------------------
function To_VxWorks_Priority (Priority : in int) return int is
begin
return Low_Priority - Priority;
end To_VxWorks_Priority;
--------------------
-- To_Clock_Ticks --
--------------------
-- ??? - For now, we'll always get the system clock rate
-- since it is allowed to be changed during run-time in
-- VxWorks. A better method would be to provide an operation
-- to set it that so we can always know its value.
--
-- Another thing we should probably allow for is a resultant
-- tick count greater than int'Last. This should probably
-- be a procedure with two output parameters, one in the
-- range 0 .. int'Last, and another representing the overflow
-- count.
function To_Clock_Ticks (D : Duration) return int is
Ticks : Long_Long_Integer;
Rate_Duration : Duration;
Ticks_Duration : Duration;
begin
if D < 0.0 then
return -1;
end if;
-- Ensure that the duration can be converted to ticks
-- at the current clock tick rate without overflowing.
Rate_Duration := Duration (sysClkRateGet);
if D > (Duration'Last / Rate_Duration) then
Ticks := Long_Long_Integer (int'Last);
else
Ticks_Duration := D * Rate_Duration;
Ticks := Long_Long_Integer (Ticks_Duration);
if Ticks_Duration > Duration (Ticks) then
Ticks := Ticks + 1;
end if;
if Ticks > Long_Long_Integer (int'Last) then
Ticks := Long_Long_Integer (int'Last);
end if;
end if;
return int (Ticks);
end To_Clock_Ticks;
----------------
-- VX_FP_TASK --
----------------
function VX_FP_TASK return int is
begin
return 16#0008#;
end VX_FP_TASK;
end System.OS_Interface;
|
