2010-07-27 Paolo Carlini <paolo.carlini@oracle.com>
[official-gcc/alias-decl.git] / gcc / ada / s-osinte-aix.adb
blobbfe03a637b2c9bf837d9708390b5c61bf7a2e8cf
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
4 -- --
5 -- S Y S T E M . O S _ I N T E R F A C E --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1997-2009, 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 ------------------------------------------------------------------------------
32 -- This is a AIX (Native) version of this package
34 pragma Polling (Off);
35 -- Turn off polling, we do not want ATC polling to take place during tasking
36 -- operations. It causes infinite loops and other problems.
38 package body System.OS_Interface is
40 use Interfaces.C;
42 -----------------
43 -- To_Duration --
44 -----------------
46 function To_Duration (TS : timespec) return Duration is
47 begin
48 return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
49 end To_Duration;
51 ------------------------
52 -- To_Target_Priority --
53 ------------------------
55 function To_Target_Priority
56 (Prio : System.Any_Priority) return Interfaces.C.int
58 Dispatching_Policy : Character;
59 pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
61 Time_Slice_Val : Integer;
62 pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
64 begin
65 -- For the case SCHED_OTHER the only valid priority across all supported
66 -- versions of AIX is 1 (note that the scheduling policy can be set
67 -- with the pragma Task_Dispatching_Policy or setting the time slice
68 -- value). Otherwise, for SCHED_RR and SCHED_FIFO, the system defines
69 -- priorities in the range 1 .. 127. This means that we must map
70 -- System.Any_Priority in the range 0 .. 126 to 1 .. 127.
72 if Dispatching_Policy = ' ' and then Time_Slice_Val < 0 then
73 return 1;
74 else
75 return Interfaces.C.int (Prio) + 1;
76 end if;
77 end To_Target_Priority;
79 -----------------
80 -- To_Timespec --
81 -----------------
83 function To_Timespec (D : Duration) return timespec is
84 S : time_t;
85 F : Duration;
87 begin
88 S := time_t (Long_Long_Integer (D));
89 F := D - Duration (S);
91 -- If F is negative due to a round-up, adjust for positive F value
93 if F < 0.0 then
94 S := S - 1;
95 F := F + 1.0;
96 end if;
98 return timespec'(tv_sec => S,
99 tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
100 end To_Timespec;
102 -------------------
103 -- clock_gettime --
104 -------------------
106 function clock_gettime
107 (clock_id : clockid_t;
108 tp : access timespec)
109 return int
111 pragma Unreferenced (clock_id);
113 -- Older AIX don't have clock_gettime, so use gettimeofday
115 use Interfaces;
117 type timeval is array (1 .. 2) of C.long;
119 procedure timeval_to_duration
120 (T : not null access timeval;
121 sec : not null access C.long;
122 usec : not null access C.long);
123 pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration");
125 Micro : constant := 10**6;
126 sec : aliased C.long;
127 usec : aliased C.long;
128 TV : aliased timeval;
129 Result : int;
131 function gettimeofday
132 (Tv : access timeval;
133 Tz : System.Address := System.Null_Address) return int;
134 pragma Import (C, gettimeofday, "gettimeofday");
136 begin
137 Result := gettimeofday (TV'Access, System.Null_Address);
138 pragma Assert (Result = 0);
139 timeval_to_duration (TV'Access, sec'Access, usec'Access);
140 tp.all := To_Timespec (Duration (sec) + Duration (usec) / Micro);
141 return Result;
142 end clock_gettime;
144 -----------------
145 -- sched_yield --
146 -----------------
148 -- AIX Thread does not have sched_yield;
150 function sched_yield return int is
151 procedure pthread_yield;
152 pragma Import (C, pthread_yield, "sched_yield");
153 begin
154 pthread_yield;
155 return 0;
156 end sched_yield;
158 --------------------
159 -- Get_Stack_Base --
160 --------------------
162 function Get_Stack_Base (thread : pthread_t) return Address is
163 pragma Warnings (Off, thread);
164 begin
165 return Null_Address;
166 end Get_Stack_Base;
168 --------------------------
169 -- PTHREAD_PRIO_INHERIT --
170 --------------------------
172 AIX_Version : Integer := 0;
173 -- AIX version in the form xy for AIX version x.y (0 means not set)
175 SYS_NMLN : constant := 32;
176 -- AIX system constant used to define utsname, see sys/utsname.h
178 subtype String_NMLN is String (1 .. SYS_NMLN);
180 type utsname is record
181 sysname : String_NMLN;
182 nodename : String_NMLN;
183 release : String_NMLN;
184 version : String_NMLN;
185 machine : String_NMLN;
186 procserial : String_NMLN;
187 end record;
188 pragma Convention (C, utsname);
190 procedure uname (name : out utsname);
191 pragma Import (C, uname);
193 function PTHREAD_PRIO_INHERIT return int is
194 name : utsname;
196 function Val (C : Character) return Integer;
197 -- Transform a numeric character ('0' .. '9') to an integer
199 ---------
200 -- Val --
201 ---------
203 function Val (C : Character) return Integer is
204 begin
205 return Character'Pos (C) - Character'Pos ('0');
206 end Val;
208 -- Start of processing for PTHREAD_PRIO_INHERIT
210 begin
211 if AIX_Version = 0 then
213 -- Set AIX_Version
215 uname (name);
216 AIX_Version := Val (name.version (1)) * 10 + Val (name.release (1));
217 end if;
219 if AIX_Version < 53 then
221 -- Under AIX < 5.3, PTHREAD_PRIO_INHERIT is defined as 0 in pthread.h
223 return 0;
225 else
226 -- Under AIX >= 5.3, PTHREAD_PRIO_INHERIT is defined as 3
228 return 3;
229 end if;
230 end PTHREAD_PRIO_INHERIT;
232 end System.OS_Interface;