File : s-osinte-lynxos178.adb
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) 2001-2016, AdaCore --
10 -- --
11 -- GNAT 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 -- --
19 -- --
20 -- --
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 ------------------------------------------------------------------------------
31
32 -- Version of System.OS_Interface for LynxOS-178 (POSIX Threads)
33
34 pragma Polling (Off);
35 -- Turn off polling, we do not want ATC polling to take place during tasking
36 -- operations. It may cause infinite loops and other problems.
37
38 package body System.OS_Interface is
39
40 use Interfaces.C;
41
42 ------------------
43 -- Current_CPU --
44 ------------------
45
46 function Current_CPU return Multiprocessors.CPU is
47 begin
48 -- No multiprocessor support, always return the first CPU Id
49
50 return Multiprocessors.CPU'First;
51 end Current_CPU;
52
53 --------------------
54 -- Get_Affinity --
55 --------------------
56
57 function Get_Affinity (Id : Thread_Id) return Multiprocessors.CPU_Range is
58 pragma Unreferenced (Id);
59
60 begin
61 -- No multiprocessor support, always return Not_A_Specific_CPU
62
63 return Multiprocessors.Not_A_Specific_CPU;
64 end Get_Affinity;
65
66 ---------------
67 -- Get_CPU --
68 ---------------
69
70 function Get_CPU (Id : Thread_Id) return Multiprocessors.CPU is
71 pragma Unreferenced (Id);
72
73 begin
74 -- No multiprocessor support, always return the first CPU Id
75
76 return Multiprocessors.CPU'First;
77 end Get_CPU;
78
79 -------------------
80 -- Get_Page_Size --
81 -------------------
82
83 SC_PAGESIZE : constant := 17;
84 -- C macro to get pagesize value from sysconf
85
86 function sysconf (name : int) return long;
87 pragma Import (C, sysconf, "sysconf");
88
89 function Get_Page_Size return int is
90 begin
91 return int (sysconf (SC_PAGESIZE));
92 end Get_Page_Size;
93
94 -----------------
95 -- To_Duration --
96 -----------------
97
98 function To_Duration (TS : timespec) return Duration is
99 begin
100 return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
101 end To_Duration;
102
103 ------------------------
104 -- To_Target_Priority --
105 ------------------------
106
107 function To_Target_Priority
108 (Prio : System.Any_Priority) return Interfaces.C.int
109 is
110 begin
111 return Interfaces.C.int (Prio);
112 end To_Target_Priority;
113
114 -----------------
115 -- To_Timespec --
116 -----------------
117
118 function To_Timespec (D : Duration) return timespec is
119 S : time_t;
120 F : Duration;
121
122 begin
123 S := time_t (Long_Long_Integer (D));
124 F := D - Duration (S);
125
126 -- If F is negative due to a round-up, adjust for positive F value
127
128 if F < 0.0 then
129 S := S - 1;
130 F := F + 1.0;
131 end if;
132
133 return timespec'(tv_sec => S,
134 tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
135 end To_Timespec;
136
137 -------------
138 -- sigwait --
139 -------------
140
141 function sigwait
142 (set : access sigset_t;
143 sig : access Signal)
144 return int
145 is
146 function sigwaitinfo
147 (set : access sigset_t;
148 info : System.Address) return Signal;
149 pragma Import (C, sigwaitinfo, "sigwaitinfo");
150
151 begin
152 sig.all := sigwaitinfo (set, Null_Address);
153
154 if sig.all = -1 then
155 return errno;
156 end if;
157
158 return 0;
159 end sigwait;
160
161 --------------------
162 -- Get_Stack_Base --
163 --------------------
164
165 function Get_Stack_Base (thread : pthread_t) return Address is
166 pragma Warnings (Off, thread);
167 begin
168 return Null_Address;
169 end Get_Stack_Base;
170
171 ------------------
172 -- pthread_init --
173 ------------------
174
175 procedure pthread_init is
176 begin
177 null;
178 end pthread_init;
179
180 end System.OS_Interface;