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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- A D A . S Y N C H R O N O U S _ T A S K _ C O N T R O L --
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6 -- --
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7 -- B o d y --
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8 -- --
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131
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9 -- Copyright (C) 1992-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 with Ada.Exceptions;
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33
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34 with System.Tasking;
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35 with System.Task_Primitives.Operations;
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36
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37 package body Ada.Synchronous_Task_Control with
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38 SPARK_Mode => Off
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39 is
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40
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41 ----------------
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42 -- Initialize --
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43 ----------------
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44
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45 procedure Initialize (S : in out Suspension_Object) is
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46 begin
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47 System.Task_Primitives.Operations.Initialize (S.SO);
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48 end Initialize;
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49
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50 --------------
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51 -- Finalize --
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52 --------------
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53
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54 procedure Finalize (S : in out Suspension_Object) is
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55 begin
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56 System.Task_Primitives.Operations.Finalize (S.SO);
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57 end Finalize;
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58
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59 -------------------
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60 -- Current_State --
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61 -------------------
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62
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63 function Current_State (S : Suspension_Object) return Boolean is
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64 begin
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65 return System.Task_Primitives.Operations.Current_State (S.SO);
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66 end Current_State;
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67
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68 ---------------
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69 -- Set_False --
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70 ---------------
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71
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72 procedure Set_False (S : in out Suspension_Object) is
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73 begin
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74 System.Task_Primitives.Operations.Set_False (S.SO);
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75 end Set_False;
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76
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77 --------------
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78 -- Set_True --
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79 --------------
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80
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81 procedure Set_True (S : in out Suspension_Object) is
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82 begin
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83 System.Task_Primitives.Operations.Set_True (S.SO);
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84 end Set_True;
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85
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86 ------------------------
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87 -- Suspend_Until_True --
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88 ------------------------
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89
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90 procedure Suspend_Until_True (S : in out Suspension_Object) is
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91 begin
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92 -- This is a potentially blocking (see ARM D.10, par. 10), so that
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93 -- if pragma Detect_Blocking is active then Program_Error must be
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94 -- raised if this operation is called from a protected action.
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95
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96 if System.Tasking.Detect_Blocking
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97 and then System.Tasking.Self.Common.Protected_Action_Nesting > 0
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98 then
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99 Ada.Exceptions.Raise_Exception
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100 (Program_Error'Identity, "potentially blocking operation");
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101 end if;
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102
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103 System.Task_Primitives.Operations.Suspend_Until_True (S.SO);
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104 end Suspend_Until_True;
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105
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106 end Ada.Synchronous_Task_Control;
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