| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- System.Atomic_Operations.Arithmetic -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2019, Free Software Foundation, Inc. -- |
| -- -- |
| -- 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. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with System.Atomic_Primitives; use System.Atomic_Primitives; |
| with Interfaces.C; |
| |
| package body System.Atomic_Operations.Arithmetic is |
| |
| ---------------- |
| -- Atomic_Add -- |
| ---------------- |
| |
| procedure Atomic_Add |
| (Item : aliased in out Atomic_Type; |
| Value : Atomic_Type) |
| is |
| Ignore : constant Atomic_Type := Atomic_Fetch_And_Add (Item, Value); |
| begin |
| null; |
| end Atomic_Add; |
| |
| --------------------- |
| -- Atomic_Subtract -- |
| --------------------- |
| |
| procedure Atomic_Subtract |
| (Item : aliased in out Atomic_Type; |
| Value : Atomic_Type) |
| is |
| Ignore : constant Atomic_Type := Atomic_Fetch_And_Subtract (Item, Value); |
| begin |
| null; |
| end Atomic_Subtract; |
| |
| -------------------------- |
| -- Atomic_Fetch_And_Add -- |
| -------------------------- |
| |
| function Atomic_Fetch_And_Add |
| (Item : aliased in out Atomic_Type; |
| Value : Atomic_Type) return Atomic_Type |
| is |
| pragma Warnings (Off); |
| function Atomic_Fetch_Add_1 |
| (Ptr : System.Address; Val : Atomic_Type; Model : Mem_Model := Seq_Cst) |
| return Atomic_Type; |
| pragma Import (Intrinsic, Atomic_Fetch_Add_1, "__atomic_fetch_add_1"); |
| function Atomic_Fetch_Add_2 |
| (Ptr : System.Address; Val : Atomic_Type; Model : Mem_Model := Seq_Cst) |
| return Atomic_Type; |
| pragma Import (Intrinsic, Atomic_Fetch_Add_2, "__atomic_fetch_add_2"); |
| function Atomic_Fetch_Add_4 |
| (Ptr : System.Address; Val : Atomic_Type; Model : Mem_Model := Seq_Cst) |
| return Atomic_Type; |
| pragma Import (Intrinsic, Atomic_Fetch_Add_4, "__atomic_fetch_add_4"); |
| function Atomic_Fetch_Add_8 |
| (Ptr : System.Address; Val : Atomic_Type; Model : Mem_Model := Seq_Cst) |
| return Atomic_Type; |
| pragma Import (Intrinsic, Atomic_Fetch_Add_8, "__atomic_fetch_add_8"); |
| pragma Warnings (On); |
| |
| begin |
| case Item'Size is |
| when 8 => return Atomic_Fetch_Add_1 (Item'Address, Value); |
| when 16 => return Atomic_Fetch_Add_2 (Item'Address, Value); |
| when 32 => return Atomic_Fetch_Add_4 (Item'Address, Value); |
| when 64 => return Atomic_Fetch_Add_8 (Item'Address, Value); |
| when others => raise Program_Error; |
| end case; |
| end Atomic_Fetch_And_Add; |
| |
| ------------------------------- |
| -- Atomic_Fetch_And_Subtract -- |
| ------------------------------- |
| |
| function Atomic_Fetch_And_Subtract |
| (Item : aliased in out Atomic_Type; |
| Value : Atomic_Type) return Atomic_Type |
| is |
| pragma Warnings (Off); |
| function Atomic_Fetch_Sub_1 |
| (Ptr : System.Address; Val : Atomic_Type; Model : Mem_Model := Seq_Cst) |
| return Atomic_Type; |
| pragma Import (Intrinsic, Atomic_Fetch_Sub_1, "__atomic_fetch_sub_1"); |
| function Atomic_Fetch_Sub_2 |
| (Ptr : System.Address; Val : Atomic_Type; Model : Mem_Model := Seq_Cst) |
| return Atomic_Type; |
| pragma Import (Intrinsic, Atomic_Fetch_Sub_2, "__atomic_fetch_sub_2"); |
| function Atomic_Fetch_Sub_4 |
| (Ptr : System.Address; Val : Atomic_Type; Model : Mem_Model := Seq_Cst) |
| return Atomic_Type; |
| pragma Import (Intrinsic, Atomic_Fetch_Sub_4, "__atomic_fetch_sub_4"); |
| function Atomic_Fetch_Sub_8 |
| (Ptr : System.Address; Val : Atomic_Type; Model : Mem_Model := Seq_Cst) |
| return Atomic_Type; |
| pragma Import (Intrinsic, Atomic_Fetch_Sub_8, "__atomic_fetch_sub_8"); |
| pragma Warnings (On); |
| |
| begin |
| case Item'Size is |
| when 8 => return Atomic_Fetch_Sub_1 (Item'Address, Value); |
| when 16 => return Atomic_Fetch_Sub_2 (Item'Address, Value); |
| when 32 => return Atomic_Fetch_Sub_4 (Item'Address, Value); |
| when 64 => return Atomic_Fetch_Sub_8 (Item'Address, Value); |
| when others => raise Program_Error; |
| end case; |
| end Atomic_Fetch_And_Subtract; |
| |
| ------------------ |
| -- Is_Lock_Free -- |
| ------------------ |
| |
| function Is_Lock_Free (Item : aliased Atomic_Type) return Boolean is |
| use type Interfaces.C.size_t; |
| begin |
| return Boolean (Atomic_Always_Lock_Free (Item'Size / 8)); |
| end Is_Lock_Free; |
| |
| end System.Atomic_Operations.Arithmetic; |
