1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- S Y S T E M . O S _ I N T E R F A C E --
9 -- Copyright (C) 1997-2007, Free Software Foundation, Inc. --
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 2, or (at your option) any later ver- --
14 -- sion. GNARL 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNARL; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNARL was developed by the GNARL team at Florida State University. --
30 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 ------------------------------------------------------------------------------
34 -- This is a AIX (Native) version of this package
37 -- Turn off polling, we do not want ATC polling to take place during tasking
38 -- operations. It causes infinite loops and other problems.
40 package body System.OS_Interface is
48 function To_Duration (TS : timespec) return Duration is
50 return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
53 function To_Duration (TV : struct_timeval) return Duration is
55 return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
58 ------------------------
59 -- To_Target_Priority --
60 ------------------------
62 function To_Target_Priority
63 (Prio : System.Any_Priority) return Interfaces.C.int
65 Dispatching_Policy : Character;
66 pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
69 -- For the case SCHED_OTHER the only valid priority across all supported
70 -- versions of AIX is 1. Otherwise, for SCHED_RR and SCHED_FIFO, the
71 -- system defines priorities in the range 1 .. 127. This means that we
72 -- must map System.Any_Priority in the range 0 .. 126 to 1 .. 127.
74 if Dispatching_Policy = ' ' then
77 return Interfaces.C.int (Prio) + 1;
79 end To_Target_Priority;
85 function To_Timespec (D : Duration) return timespec is
90 S := time_t (Long_Long_Integer (D));
91 F := D - Duration (S);
93 -- If F is negative due to a round-up, adjust for positive F value
100 return timespec'(tv_sec => S,
101 tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
108 function To_Timeval (D : Duration) return struct_timeval is
113 S := long (Long_Long_Integer (D));
114 F := D - Duration (S);
116 -- If F is negative due to a round-up, adjust for positive F value
126 tv_usec => long (Long_Long_Integer (F * 10#1#E6)));
133 function clock_gettime
134 (clock_id : clockid_t;
135 tp : access timespec)
138 pragma Warnings (Off, clock_id);
141 tv : aliased struct_timeval;
143 function gettimeofday
144 (tv : access struct_timeval;
145 tz : System.Address := System.Null_Address)
147 pragma Import (C, gettimeofday, "gettimeofday");
150 Result := gettimeofday (tv'Unchecked_Access);
151 tp.all := To_Timespec (To_Duration (tv));
159 -- AIX Thread does not have sched_yield;
161 function sched_yield return int is
162 procedure pthread_yield;
163 pragma Import (C, pthread_yield, "sched_yield");
173 function Get_Stack_Base (thread : pthread_t) return Address is
174 pragma Warnings (Off, thread);
179 --------------------------
180 -- PTHREAD_PRIO_INHERIT --
181 --------------------------
183 AIX_Version : Integer := 0;
184 -- AIX version in the form xy for AIX version x.y (0 means not set)
186 SYS_NMLN : constant := 32;
187 -- AIX system constant used to define utsname, see sys/utsname.h
189 subtype String_NMLN is String (1 .. SYS_NMLN);
191 type utsname is record
192 sysname : String_NMLN;
193 nodename : String_NMLN;
194 release : String_NMLN;
195 version : String_NMLN;
196 machine : String_NMLN;
197 procserial : String_NMLN;
199 pragma Convention (C, utsname);
201 procedure uname (name : out utsname);
202 pragma Import (C, uname);
204 function PTHREAD_PRIO_INHERIT return int is
207 function Val (C : Character) return Integer;
208 -- Transform a numeric character ('0' .. '9') to an integer
214 function Val (C : Character) return Integer is
216 return Character'Pos (C) - Character'Pos ('0');
219 -- Start of processing for PTHREAD_PRIO_INHERIT
222 if AIX_Version = 0 then
227 AIX_Version := Val (name.version (1)) * 10 + Val (name.release (1));
230 if AIX_Version < 53 then
232 -- Under AIX < 5.3, PTHREAD_PRIO_INHERIT is defined as 0 in pthread.h
237 -- Under AIX >= 5.3, PTHREAD_PRIO_INHERIT is defined as 3
241 end PTHREAD_PRIO_INHERIT;
243 end System.OS_Interface;