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) 1999-2020, 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 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. --
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. --
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/>. --
27 -- GNARL was developed by the GNARL team at Florida State University. --
28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
30 ------------------------------------------------------------------------------
32 -- This is a Darwin Threads version of this package
34 with Interfaces
.C
.Extensions
;
36 package body System
.OS_Interface
is
43 function To_Duration
(TS
: timespec
) return Duration is
45 return Duration (TS
.tv_sec
) + Duration (TS
.tv_nsec
) / 10#
1#E9
;
48 ------------------------
49 -- To_Target_Priority --
50 ------------------------
52 function To_Target_Priority
53 (Prio
: System
.Any_Priority
) return Interfaces
.C
.int
56 return Interfaces
.C
.int
(Prio
);
57 end To_Target_Priority
;
63 function To_Timespec
(D
: Duration) return timespec
is
68 S
:= time_t
(Long_Long_Integer (D
));
69 F
:= D
- Duration (S
);
71 -- If F has negative value due to a round-up, adjust for positive F
79 return timespec
'(tv_sec => S,
80 tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
87 function clock_gettime
88 (clock_id : clockid_t;
89 tp : access timespec) return int
91 pragma Unreferenced (clock_id);
93 -- Darwin Threads don't have clock_gettime, so use gettimeofday
97 type timeval is array (1 .. 3) of C.long;
98 -- The timeval array is sized to contain long_long sec and long usec.
99 -- If long_long'Size = long'Size then it will be overly large but that
100 -- won't effect the implementation since it's not accessed directly.
102 procedure timeval_to_duration
103 (T : not null access timeval;
104 sec : not null access C.Extensions.long_long;
105 usec : not null access C.long);
106 pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration");
108 Micro : constant := 10**6;
109 sec : aliased C.Extensions.long_long;
110 usec : aliased C.long;
111 TV : aliased timeval;
114 function gettimeofday
115 (Tv : access timeval;
116 Tz : System.Address := System.Null_Address) return int;
117 pragma Import (C, gettimeofday, "gettimeofday");
120 Result := gettimeofday (TV'Access, System.Null_Address);
121 pragma Assert (Result = 0);
122 timeval_to_duration (TV'Access, sec'Access, usec'Access);
123 tp.all := To_Timespec (Duration (sec) + Duration (usec) / Micro);
131 function clock_getres
132 (clock_id : clockid_t;
133 res : access timespec) return int
135 pragma Unreferenced (clock_id);
137 -- Darwin Threads don't have clock_getres.
139 Nano : constant := 10**9;
143 function clock_get_res return int;
144 pragma Import (C, clock_get_res, "__gnat_clock_get_res");
147 nsec := clock_get_res;
148 res.all := To_Timespec (Duration (0.0) + Duration (nsec) / Nano);
161 function sched_yield return int is
162 procedure sched_yield_base (arg : System.Address);
163 pragma Import (C, sched_yield_base, "pthread_yield_np");
166 sched_yield_base (System.Null_Address);
174 procedure pthread_init is
183 function Get_Stack_Base (thread : pthread_t) return Address is
184 pragma Unreferenced (thread);
186 return System.Null_Address;
189 end System.OS_Interface;