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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- S Y S T E M . G L O B A L _ L O C K S --
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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) 1999-2017, 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 -- This package contains the necessary routines to provide
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33 -- reliable system wide locking capability.
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34
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35 package System.Global_Locks is
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36
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37 Lock_Error : exception;
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38 -- Exception raised if a request cannot be executed on a lock
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39
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40 type Lock_Type is private;
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41 -- Such a lock is a global lock between partitions. This lock is
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42 -- uniquely defined between the partitions because of its name.
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43
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44 Null_Lock : constant Lock_Type;
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45 -- This needs comments ???
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46
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47 procedure Create_Lock (Lock : out Lock_Type; Name : String);
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48 -- Create or retrieve a global lock for the current partition using
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49 -- its Name.
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50
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51 procedure Acquire_Lock (Lock : in out Lock_Type);
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52 -- If the lock cannot be acquired because someone already owns it, this
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53 -- procedure is supposed to wait and retry forever.
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54
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55 procedure Release_Lock (Lock : in out Lock_Type);
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56
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57 private
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58
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59 type Lock_Type is new Natural;
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60
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61 Null_Lock : constant Lock_Type := 0;
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62
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63 end System.Global_Locks;
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