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) 1997-2006, 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 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 getpid return t_id is
56 -- VxWorks 5 (and VxWorks 6 in kernel mode) does not have a getpid
57 -- function. taskIdSelf is the equivalent routine.
66 function kill (pid : t_id; sig : Signal) return int is
67 function c_kill (pid : t_id; sig : Signal) return int;
68 pragma Import (C, c_kill, "kill");
70 return c_kill (pid, sig);
77 function Set_Time_Slice (ticks : int) return int is
78 function kernelTimeSlice (ticks : int) return int;
79 pragma Import (C, kernelTimeSlice, "kernelTimeSlice");
81 return kernelTimeSlice (ticks);
89 (set : access sigset_t;
90 sig : access Signal) return int
95 (set : access sigset_t; sigvalue : System.Address) return int;
96 pragma Import (C, sigwaitinfo, "sigwaitinfo");
99 Result := sigwaitinfo (set, System.Null_Address);
102 sig.all := Signal (Result);
114 function To_Duration (TS : timespec) return Duration is
116 return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;
123 function To_Timespec (D : Duration) return timespec is
128 S := time_t (Long_Long_Integer (D));
129 F := D - Duration (S);
131 -- If F is negative due to a round-up, adjust for positive F value
138 return timespec'(ts_sec => S,
139 ts_nsec => long (Long_Long_Integer (F * 10#1#E9)));
142 -------------------------
143 -- To_VxWorks_Priority --
144 -------------------------
146 function To_VxWorks_Priority (Priority : int) return int is
148 return Low_Priority - Priority;
149 end To_VxWorks_Priority;
155 -- ??? - For now, we'll always get the system clock rate since it is
156 -- allowed to be changed during run-time in VxWorks. A better method would
157 -- be to provide an operation to set it that so we can always know its
160 -- Another thing we should probably allow for is a resultant tick count
161 -- greater than int'Last. This should probably be a procedure with two
162 -- output parameters, one in the range 0 .. int'Last, and another
163 -- representing the overflow count.
165 function To_Clock_Ticks (D : Duration) return int is
166 Ticks : Long_Long_Integer;
167 Rate_Duration : Duration;
168 Ticks_Duration : Duration;
175 -- Ensure that the duration can be converted to ticks
176 -- at the current clock tick rate without overflowing.
178 Rate_Duration := Duration (sysClkRateGet);
180 if D > (Duration'Last / Rate_Duration) then
181 Ticks := Long_Long_Integer (int'Last);
183 Ticks_Duration := D * Rate_Duration;
184 Ticks := Long_Long_Integer (Ticks_Duration);
186 if Ticks_Duration > Duration (Ticks) then
190 if Ticks > Long_Long_Integer (int'Last) then
191 Ticks := Long_Long_Integer (int'Last);
198 end System.OS_Interface;