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 the VxWorks version
36 -- This package encapsulates all direct interfaces to OS services that are
37 -- needed by children of System.
40 -- Turn off polling, we do not want ATC polling to take place during tasking
41 -- 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
56 return System.VxWorks.Ext.kill (pid, int (sig));
64 (set : access sigset_t;
65 sig : access Signal) return int
70 (set : access sigset_t; sigvalue : System.Address) return int;
71 pragma Import (C, sigwaitinfo, "sigwaitinfo");
74 Result := sigwaitinfo (set, System.Null_Address);
77 sig.all := Signal (Result);
89 function To_Duration (TS : timespec) return Duration is
91 return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;
98 function To_Timespec (D : Duration) return timespec is
103 S := time_t (Long_Long_Integer (D));
104 F := D - Duration (S);
106 -- If F is negative due to a round-up, adjust for positive F value
113 return timespec'(ts_sec => S,
114 ts_nsec => long (Long_Long_Integer (F * 10#1#E9)));
117 -------------------------
118 -- To_VxWorks_Priority --
119 -------------------------
121 function To_VxWorks_Priority (Priority : int) return int is
123 return Low_Priority - Priority;
124 end To_VxWorks_Priority;
130 -- ??? - For now, we'll always get the system clock rate since it is
131 -- allowed to be changed during run-time in VxWorks. A better method would
132 -- be to provide an operation to set it that so we can always know its
135 -- Another thing we should probably allow for is a resultant tick count
136 -- greater than int'Last. This should probably be a procedure with two
137 -- output parameters, one in the range 0 .. int'Last, and another
138 -- representing the overflow count.
140 function To_Clock_Ticks (D : Duration) return int is
141 Ticks : Long_Long_Integer;
142 Rate_Duration : Duration;
143 Ticks_Duration : Duration;
150 -- Ensure that the duration can be converted to ticks
151 -- at the current clock tick rate without overflowing.
153 Rate_Duration := Duration (sysClkRateGet);
155 if D > (Duration'Last / Rate_Duration) then
156 Ticks := Long_Long_Integer (int'Last);
158 Ticks_Duration := D * Rate_Duration;
159 Ticks := Long_Long_Integer (Ticks_Duration);
161 if Ticks_Duration > Duration (Ticks) then
165 if Ticks > Long_Long_Integer (int'Last) then
166 Ticks := Long_Long_Integer (int'Last);
173 end System.OS_Interface;