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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- System.Atomic_Operations.Exchange --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 2019, Free Software Foundation, Inc. --
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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 pragma Ada_2020;
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33
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34 generic
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35 type Atomic_Type is private with Atomic;
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36 package System.Atomic_Operations.Exchange
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37 with Pure
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38 -- Blocking
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39 is
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40 function Atomic_Exchange
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41 (Item : aliased in out Atomic_Type;
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42 Value : Atomic_Type) return Atomic_Type with Convention => Intrinsic;
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43
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44 function Atomic_Compare_And_Exchange
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45 (Item : aliased in out Atomic_Type;
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46 Prior : aliased in out Atomic_Type;
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47 Desired : Atomic_Type) return Boolean with Convention => Intrinsic;
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48
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49 function Is_Lock_Free
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50 (Item : aliased Atomic_Type) return Boolean with Convention => Intrinsic;
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51
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52 private
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53 pragma Inline_Always (Atomic_Exchange);
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54 pragma Inline_Always (Atomic_Compare_And_Exchange);
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55 pragma Inline_Always (Is_Lock_Free);
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56 end System.Atomic_Operations.Exchange;
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