| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S Y S T E M . G L O B A L _ L O C K S -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1999-2021, AdaCore -- |
| -- -- |
| -- GNAT is free software; you can redistribute it and/or modify it under -- |
| -- terms of the GNU General Public License as published by the Free Soft- -- |
| -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. -- |
| -- -- |
| -- As a special exception under Section 7 of GPL version 3, you are granted -- |
| -- additional permissions described in the GCC Runtime Library Exception, -- |
| -- version 3.1, as published by the Free Software Foundation. -- |
| -- -- |
| -- You should have received a copy of the GNU General Public License and -- |
| -- a copy of the GCC Runtime Library Exception along with this program; -- |
| -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This implementation is specific to NT |
| |
| with System.OS_Interface; |
| with System.Task_Lock; |
| with System.Win32; |
| |
| with Interfaces.C.Strings; |
| |
| package body System.Global_Locks is |
| |
| package TSL renames System.Task_Lock; |
| package OSI renames System.OS_Interface; |
| package ICS renames Interfaces.C.Strings; |
| |
| subtype Lock_File_Entry is Win32.HANDLE; |
| |
| Last_Lock : Lock_Type := Null_Lock; |
| Lock_Table : array (Lock_Type range 1 .. 15) of Lock_File_Entry; |
| |
| ----------------- |
| -- Create_Lock -- |
| ----------------- |
| |
| procedure Create_Lock (Lock : out Lock_Type; Name : String) is |
| L : Lock_Type; |
| |
| begin |
| TSL.Lock; |
| Last_Lock := Last_Lock + 1; |
| L := Last_Lock; |
| TSL.Unlock; |
| |
| if L > Lock_Table'Last then |
| raise Lock_Error; |
| end if; |
| |
| Lock_Table (L) := |
| OSI.CreateMutex (null, Win32.FALSE, ICS.New_String (Name)); |
| Lock := L; |
| end Create_Lock; |
| |
| ------------------ |
| -- Acquire_Lock -- |
| ------------------ |
| |
| procedure Acquire_Lock (Lock : in out Lock_Type) is |
| use type Win32.DWORD; |
| |
| Res : Win32.DWORD; |
| |
| begin |
| Res := OSI.WaitForSingleObject (Lock_Table (Lock), OSI.Wait_Infinite); |
| |
| if Res = OSI.WAIT_FAILED then |
| raise Lock_Error; |
| end if; |
| end Acquire_Lock; |
| |
| ------------------ |
| -- Release_Lock -- |
| ------------------ |
| |
| procedure Release_Lock (Lock : in out Lock_Type) is |
| use type Win32.BOOL; |
| |
| Res : Win32.BOOL; |
| |
| begin |
| Res := OSI.ReleaseMutex (Lock_Table (Lock)); |
| |
| if Res = Win32.FALSE then |
| raise Lock_Error; |
| end if; |
| end Release_Lock; |
| |
| end System.Global_Locks; |
