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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- S Y S T E M . G L O B A L _ L O C K S --
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6 -- --
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7 -- B o d y --
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8 -- --
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145
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9 -- Copyright (C) 1999-2019, AdaCore --
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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 -- This implementation is specific to NT
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33
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34 with System.OS_Interface;
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35 with System.Task_Lock;
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36 with System.Win32;
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37
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38 with Interfaces.C.Strings;
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39
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40 package body System.Global_Locks is
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41
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42 package TSL renames System.Task_Lock;
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43 package OSI renames System.OS_Interface;
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44 package ICS renames Interfaces.C.Strings;
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45
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46 subtype Lock_File_Entry is Win32.HANDLE;
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47
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48 Last_Lock : Lock_Type := Null_Lock;
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49 Lock_Table : array (Lock_Type range 1 .. 15) of Lock_File_Entry;
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50
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51 -----------------
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52 -- Create_Lock --
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53 -----------------
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54
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55 procedure Create_Lock (Lock : out Lock_Type; Name : String) is
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56 L : Lock_Type;
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57
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58 begin
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59 TSL.Lock;
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60 Last_Lock := Last_Lock + 1;
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61 L := Last_Lock;
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62 TSL.Unlock;
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63
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64 if L > Lock_Table'Last then
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65 raise Lock_Error;
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66 end if;
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67
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68 Lock_Table (L) :=
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69 OSI.CreateMutex (null, Win32.FALSE, ICS.New_String (Name));
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70 Lock := L;
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71 end Create_Lock;
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72
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73 ------------------
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74 -- Acquire_Lock --
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75 ------------------
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76
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77 procedure Acquire_Lock (Lock : in out Lock_Type) is
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78 use type Win32.DWORD;
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79
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80 Res : Win32.DWORD;
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81
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82 begin
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83 Res := OSI.WaitForSingleObject (Lock_Table (Lock), OSI.Wait_Infinite);
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84
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85 if Res = OSI.WAIT_FAILED then
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86 raise Lock_Error;
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87 end if;
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88 end Acquire_Lock;
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89
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90 ------------------
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91 -- Release_Lock --
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92 ------------------
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93
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94 procedure Release_Lock (Lock : in out Lock_Type) is
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95 use type Win32.BOOL;
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96
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97 Res : Win32.BOOL;
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98
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99 begin
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100 Res := OSI.ReleaseMutex (Lock_Table (Lock));
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101
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102 if Res = Win32.FALSE then
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103 raise Lock_Error;
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104 end if;
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105 end Release_Lock;
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106
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107 end System.Global_Locks;
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