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) 1997-2005 Free Software Foundation --
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 the VxWorks version.
36 -- This package encapsulates all direct interfaces to OS services
37 -- that are needed by children of System.
40 -- Turn off polling, we do not want ATC polling to take place during
41 -- tasking operations. It causes infinite loops and other problems.
43 package body System
.OS_Interface
is
45 use type Interfaces
.C
.int
;
47 Low_Priority
: constant := 255;
48 -- VxWorks native (default) lowest scheduling priority.
54 function kill
(pid
: t_id
; sig
: Signal
) return int
is
55 function c_kill
(pid
: t_id
; sig
: Signal
) return int
;
56 pragma Import
(C
, c_kill
, "kill");
58 return c_kill
(pid
, sig
);
65 function Set_Time_Slice
(ticks
: int
) return int
is
66 function kernelTimeSlice
(ticks
: int
) return int
;
67 pragma Import
(C
, kernelTimeSlice
, "kernelTimeSlice");
69 return kernelTimeSlice
(ticks
);
77 (set
: access sigset_t
;
78 sig
: access Signal
) return int
83 (set
: access sigset_t
; sigvalue
: System
.Address
) return int
;
84 pragma Import
(C
, sigwaitinfo
, "sigwaitinfo");
87 Result
:= sigwaitinfo
(set
, System
.Null_Address
);
90 sig
.all := Signal
(Result
);
102 function To_Duration
(TS
: timespec
) return Duration is
104 return Duration (TS
.ts_sec
) + Duration (TS
.ts_nsec
) / 10#
1#E9
;
111 function To_Timespec
(D
: Duration) return timespec
is
115 S
:= time_t
(Long_Long_Integer (D
));
116 F
:= D
- Duration (S
);
118 -- If F has negative value due to a round-up, adjust for positive F
125 return timespec
'(ts_sec => S,
126 ts_nsec => long (Long_Long_Integer (F * 10#1#E9)));
129 -------------------------
130 -- To_VxWorks_Priority --
131 -------------------------
133 function To_VxWorks_Priority (Priority : in int) return int is
135 return Low_Priority - Priority;
136 end To_VxWorks_Priority;
142 -- ??? - For now, we'll always get the system clock rate
143 -- since it is allowed to be changed during run-time in
144 -- VxWorks. A better method would be to provide an operation
145 -- to set it that so we can always know its value.
147 -- Another thing we should probably allow for is a resultant
148 -- tick count greater than int'Last. This should probably
149 -- be a procedure with two output parameters, one in the
150 -- range 0 .. int'Last, and another representing the overflow
153 function To_Clock_Ticks (D : Duration) return int is
154 Ticks : Long_Long_Integer;
155 Rate_Duration : Duration;
156 Ticks_Duration : Duration;
163 -- Ensure that the duration can be converted to ticks
164 -- at the current clock tick rate without overflowing.
166 Rate_Duration := Duration (sysClkRateGet);
168 if D > (Duration'Last / Rate_Duration) then
169 Ticks := Long_Long_Integer (int'Last);
171 Ticks_Duration := D * Rate_Duration;
172 Ticks := Long_Long_Integer (Ticks_Duration);
174 if Ticks_Duration > Duration (Ticks) then
178 if Ticks > Long_Long_Integer (int'Last) then
179 Ticks := Long_Long_Integer (int'Last);
190 function VX_FP_TASK return int is
195 end System.OS_Interface;