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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [s-atocou-x86.adb] - Rev 718
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------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- S Y S T E M . A T O M I C _ C O U N T E R S -- -- -- -- B o d y -- -- -- -- Copyright (C) 2011, 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 of the package for x86 processor. GCC can't generate -- code for atomic builtins for 386 CPU. Only increment/decrement instructions -- are supported, thus this implementaton uses machine code insertions to -- access the necessary instructions. with System.Machine_Code; package body System.Atomic_Counters is -- Add comments showing in normal asm language what we generate??? --------------- -- Decrement -- --------------- function Decrement (Item : in out Atomic_Counter) return Boolean is Aux : Boolean; begin System.Machine_Code.Asm (Template => "lock%; decl" & ASCII.HT & "%0" & ASCII.LF & ASCII.HT & "sete %1", Outputs => (Unsigned_32'Asm_Output ("=m", Item.Value), Boolean'Asm_Output ("=qm", Aux)), Inputs => Unsigned_32'Asm_Input ("m", Item.Value), Volatile => True); return Aux; end Decrement; --------------- -- Increment -- --------------- procedure Increment (Item : in out Atomic_Counter) is begin System.Machine_Code.Asm (Template => "lock%; incl" & ASCII.HT & "%0", Outputs => Unsigned_32'Asm_Output ("=m", Item.Value), Inputs => Unsigned_32'Asm_Input ("m", Item.Value), Volatile => True); end Increment; ------------ -- Is_One -- ------------ function Is_One (Item : Atomic_Counter) return Boolean is begin return Item.Value = 1; end Is_One; end System.Atomic_Counters;
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