annotate gcc/ada/libgnarl/s-osinte__posix.adb @ 131:84e7813d76e9

gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
parents 04ced10e8804
children 1830386684a0
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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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4 -- --
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5 -- S Y S T E M . O S _ I N T E R F A C E --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 1991-2017, Florida State University --
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10 -- Copyright (C) 1995-2018, AdaCore --
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11 -- --
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12 -- GNAT is free software; you can redistribute it and/or modify it under --
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13 -- terms of the GNU General Public License as published by the Free Soft- --
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14 -- ware Foundation; either version 3, or (at your option) any later ver- --
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15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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17 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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18 -- --
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19 -- As a special exception under Section 7 of GPL version 3, you are granted --
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20 -- additional permissions described in the GCC Runtime Library Exception, --
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21 -- version 3.1, as published by the Free Software Foundation. --
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22 -- --
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23 -- You should have received a copy of the GNU General Public License and --
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24 -- a copy of the GCC Runtime Library Exception along with this program; --
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25 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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26 -- <http://www.gnu.org/licenses/>. --
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27 -- --
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28 -- GNARL was developed by the GNARL team at Florida State University. --
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29 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
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30 -- --
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31 ------------------------------------------------------------------------------
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32
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33 -- This version is for POSIX-like operating systems
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34
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35 pragma Polling (Off);
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36 -- Turn off polling, we do not want ATC polling to take place during
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37 -- tasking operations. It causes infinite loops and other problems.
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38
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39 -- This package encapsulates all direct interfaces to OS services
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40 -- that are needed by children of System.
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41
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42 with Interfaces.C; use Interfaces.C;
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43 package body System.OS_Interface is
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44
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45 --------------------
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46 -- Get_Stack_Base --
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47 --------------------
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48
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49 function Get_Stack_Base (thread : pthread_t) return Address is
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50 pragma Warnings (Off, thread);
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51
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52 begin
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53 return Null_Address;
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54 end Get_Stack_Base;
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55
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56 ------------------
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57 -- pthread_init --
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58 ------------------
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59
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60 procedure pthread_init is
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61 begin
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62 null;
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63 end pthread_init;
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64
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65 -----------------
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66 -- To_Duration --
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67 -----------------
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68
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69 function To_Duration (TS : timespec) return Duration is
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70 begin
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71 return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
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72 end To_Duration;
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73
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74 ------------------------
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75 -- To_Target_Priority --
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76 ------------------------
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77
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78 function To_Target_Priority
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79 (Prio : System.Any_Priority) return Interfaces.C.int
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80 is
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81 begin
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82 return Interfaces.C.int (Prio);
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83 end To_Target_Priority;
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84
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85 -----------------
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86 -- To_Timespec --
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87 -----------------
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88
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89 function To_Timespec (D : Duration) return timespec is
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90 S : time_t;
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91 F : Duration;
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92
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93 begin
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94 S := time_t (Long_Long_Integer (D));
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95 F := D - Duration (S);
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96
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97 -- If F has negative value due to a round-up, adjust for positive F
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98 -- value.
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99
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100 if F < 0.0 then
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101 S := S - 1;
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102 F := F + 1.0;
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103 end if;
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104
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105 return timespec'(tv_sec => S,
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106 tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
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107 end To_Timespec;
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108
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109 end System.OS_Interface;