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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT LIBRARY COMPONENTS --
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4 -- --
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5 -- G N A T . S E M A P H O R E S --
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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) 2003-2017, AdaCore --
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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 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 package body GNAT.Semaphores is
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33
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34 ------------------------
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35 -- Counting_Semaphore --
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36 ------------------------
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37
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38 protected body Counting_Semaphore is
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39
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40 -----------
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41 -- Seize --
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42 -----------
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43
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44 entry Seize when Count > 0 is
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45 begin
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46 Count := Count - 1;
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47 end Seize;
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48
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49 -------------
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50 -- Release --
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51 -------------
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52
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53 procedure Release is
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54 begin
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55 Count := Count + 1;
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56 end Release;
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57 end Counting_Semaphore;
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58
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59 ----------------------
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60 -- Binary_Semaphore --
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61 ----------------------
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62
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63 protected body Binary_Semaphore is
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64
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65 -----------
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66 -- Seize --
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67 -----------
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68
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69 entry Seize when Available is
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70 begin
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71 Available := False;
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72 end Seize;
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73
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74 -------------
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75 -- Release --
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76 -------------
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77
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78 procedure Release is
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79 begin
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80 Available := True;
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81 end Release;
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82 end Binary_Semaphore;
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83
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84 end GNAT.Semaphores;
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