Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnat/g-locfil.adb @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
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| 68:561a7518be6b | 111:04ced10e8804 |
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| 1 ------------------------------------------------------------------------------ | |
| 2 -- -- | |
| 3 -- GNAT COMPILER COMPONENTS -- | |
| 4 -- -- | |
| 5 -- G N A T . L O C K _ F I L E S -- | |
| 6 -- -- | |
| 7 -- B o d y -- | |
| 8 -- -- | |
| 9 -- Copyright (C) 1998-2017, Free Software Foundation, Inc. -- | |
| 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 -- As a special exception under Section 7 of GPL version 3, you are granted -- | |
| 19 -- additional permissions described in the GCC Runtime Library Exception, -- | |
| 20 -- version 3.1, as published by the Free Software Foundation. -- | |
| 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 -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 28 -- Extensive contributions were provided by Ada Core Technologies Inc. -- | |
| 29 -- -- | |
| 30 ------------------------------------------------------------------------------ | |
| 31 | |
| 32 with System; | |
| 33 | |
| 34 package body GNAT.Lock_Files is | |
| 35 | |
| 36 Dir_Separator : Character; | |
| 37 pragma Import (C, Dir_Separator, "__gnat_dir_separator"); | |
| 38 | |
| 39 --------------- | |
| 40 -- Lock_File -- | |
| 41 --------------- | |
| 42 | |
| 43 procedure Lock_File | |
| 44 (Directory : Path_Name; | |
| 45 Lock_File_Name : Path_Name; | |
| 46 Wait : Duration := 1.0; | |
| 47 Retries : Natural := Natural'Last) | |
| 48 is | |
| 49 Dir : aliased String := Directory & ASCII.NUL; | |
| 50 File : aliased String := Lock_File_Name & ASCII.NUL; | |
| 51 | |
| 52 function Try_Lock (Dir, File : System.Address) return Integer; | |
| 53 pragma Import (C, Try_Lock, "__gnat_try_lock"); | |
| 54 | |
| 55 begin | |
| 56 -- If a directory separator was provided, just remove the one we have | |
| 57 -- added above. | |
| 58 | |
| 59 if Directory (Directory'Last) = Dir_Separator | |
| 60 or else Directory (Directory'Last) = '/' | |
| 61 then | |
| 62 Dir (Dir'Last - 1) := ASCII.NUL; | |
| 63 end if; | |
| 64 | |
| 65 -- Try to lock the file Retries times | |
| 66 | |
| 67 for I in 0 .. Retries loop | |
| 68 if Try_Lock (Dir'Address, File'Address) = 1 then | |
| 69 return; | |
| 70 end if; | |
| 71 | |
| 72 exit when I = Retries; | |
| 73 delay Wait; | |
| 74 end loop; | |
| 75 | |
| 76 raise Lock_Error; | |
| 77 end Lock_File; | |
| 78 | |
| 79 --------------- | |
| 80 -- Lock_File -- | |
| 81 --------------- | |
| 82 | |
| 83 procedure Lock_File | |
| 84 (Lock_File_Name : Path_Name; | |
| 85 Wait : Duration := 1.0; | |
| 86 Retries : Natural := Natural'Last) | |
| 87 is | |
| 88 begin | |
| 89 for J in reverse Lock_File_Name'Range loop | |
| 90 if Lock_File_Name (J) = Dir_Separator | |
| 91 or else Lock_File_Name (J) = '/' | |
| 92 then | |
| 93 Lock_File | |
| 94 (Lock_File_Name (Lock_File_Name'First .. J - 1), | |
| 95 Lock_File_Name (J + 1 .. Lock_File_Name'Last), | |
| 96 Wait, | |
| 97 Retries); | |
| 98 return; | |
| 99 end if; | |
| 100 end loop; | |
| 101 | |
| 102 Lock_File (".", Lock_File_Name, Wait, Retries); | |
| 103 end Lock_File; | |
| 104 | |
| 105 ----------------- | |
| 106 -- Unlock_File -- | |
| 107 ----------------- | |
| 108 | |
| 109 procedure Unlock_File (Lock_File_Name : Path_Name) is | |
| 110 S : aliased String := Lock_File_Name & ASCII.NUL; | |
| 111 | |
| 112 procedure unlink (A : System.Address); | |
| 113 pragma Import (C, unlink, "unlink"); | |
| 114 | |
| 115 begin | |
| 116 unlink (S'Address); | |
| 117 end Unlock_File; | |
| 118 | |
| 119 ----------------- | |
| 120 -- Unlock_File -- | |
| 121 ----------------- | |
| 122 | |
| 123 procedure Unlock_File (Directory : Path_Name; Lock_File_Name : Path_Name) is | |
| 124 begin | |
| 125 if Directory (Directory'Last) = Dir_Separator | |
| 126 or else Directory (Directory'Last) = '/' | |
| 127 then | |
| 128 Unlock_File (Directory & Lock_File_Name); | |
| 129 else | |
| 130 Unlock_File (Directory & Dir_Separator & Lock_File_Name); | |
| 131 end if; | |
| 132 end Unlock_File; | |
| 133 | |
| 134 end GNAT.Lock_Files; |