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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
------------------------------------------------------------------------------
-- --
-- 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) 1997-2009, 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 3, or (at your option) any later ver- --
-- sion. GNAT 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. --
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
-- This is a AIX (Native) version of this package
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 Interfaces.C;
-----------------
-- To_Duration --
-----------------
function To_Duration (TS : timespec) return Duration is
begin
return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
end To_Duration;
------------------------
-- To_Target_Priority --
------------------------
function To_Target_Priority
(Prio : System.Any_Priority) return Interfaces.C.int
is
Dispatching_Policy : Character;
pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
Time_Slice_Val : Integer;
pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
begin
-- For the case SCHED_OTHER the only valid priority across all supported
-- versions of AIX is 1 (note that the scheduling policy can be set
-- with the pragma Task_Dispatching_Policy or setting the time slice
-- value). Otherwise, for SCHED_RR and SCHED_FIFO, the system defines
-- priorities in the range 1 .. 127. This means that we must map
-- System.Any_Priority in the range 0 .. 126 to 1 .. 127.
if Dispatching_Policy = ' ' and then Time_Slice_Val < 0 then
return 1;
else
return Interfaces.C.int (Prio) + 1;
end if;
end To_Target_Priority;
-----------------
-- 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 is negative 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'(tv_sec => S,
tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
end To_Timespec;
-------------------
-- clock_gettime --
-------------------
function clock_gettime
(clock_id : clockid_t;
tp : access timespec)
return int
is
pragma Unreferenced (clock_id);
-- Older AIX don't have clock_gettime, so use gettimeofday
use Interfaces;
type timeval is array (1 .. 2) of C.long;
procedure timeval_to_duration
(T : not null access timeval;
sec : not null access C.long;
usec : not null access C.long);
pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration");
Micro : constant := 10**6;
sec : aliased C.long;
usec : aliased C.long;
TV : aliased timeval;
Result : int;
function gettimeofday
(Tv : access timeval;
Tz : System.Address := System.Null_Address) return int;
pragma Import (C, gettimeofday, "gettimeofday");
begin
Result := gettimeofday (TV'Access, System.Null_Address);
pragma Assert (Result = 0);
timeval_to_duration (TV'Access, sec'Access, usec'Access);
tp.all := To_Timespec (Duration (sec) + Duration (usec) / Micro);
return Result;
end clock_gettime;
-----------------
-- sched_yield --
-----------------
-- AIX Thread does not have sched_yield;
function sched_yield return int is
procedure pthread_yield;
pragma Import (C, pthread_yield, "sched_yield");
begin
pthread_yield;
return 0;
end sched_yield;
--------------------
-- Get_Stack_Base --
--------------------
function Get_Stack_Base (thread : pthread_t) return Address is
pragma Warnings (Off, thread);
begin
return Null_Address;
end Get_Stack_Base;
--------------------------
-- PTHREAD_PRIO_INHERIT --
--------------------------
AIX_Version : Integer := 0;
-- AIX version in the form xy for AIX version x.y (0 means not set)
SYS_NMLN : constant := 32;
-- AIX system constant used to define utsname, see sys/utsname.h
subtype String_NMLN is String (1 .. SYS_NMLN);
type utsname is record
sysname : String_NMLN;
nodename : String_NMLN;
release : String_NMLN;
version : String_NMLN;
machine : String_NMLN;
procserial : String_NMLN;
end record;
pragma Convention (C, utsname);
procedure uname (name : out utsname);
pragma Import (C, uname);
function PTHREAD_PRIO_INHERIT return int is
name : utsname;
function Val (C : Character) return Integer;
-- Transform a numeric character ('0' .. '9') to an integer
---------
-- Val --
---------
function Val (C : Character) return Integer is
begin
return Character'Pos (C) - Character'Pos ('0');
end Val;
-- Start of processing for PTHREAD_PRIO_INHERIT
begin
if AIX_Version = 0 then
-- Set AIX_Version
uname (name);
AIX_Version := Val (name.version (1)) * 10 + Val (name.release (1));
end if;
if AIX_Version < 53 then
-- Under AIX < 5.3, PTHREAD_PRIO_INHERIT is defined as 0 in pthread.h
return 0;
else
-- Under AIX >= 5.3, PTHREAD_PRIO_INHERIT is defined as 3
return 3;
end if;
end PTHREAD_PRIO_INHERIT;
end System.OS_Interface;
|
