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1 | #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_NT_HPP_INCLUDED |
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2 | #define BOOST_SMART_PTR_DETAIL_SPINLOCK_NT_HPP_INCLUDED |
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3 | |
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4 | // MS compatible compilers support #pragma once |
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5 | |
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6 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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7 | # pragma once |
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8 | #endif |
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9 | |
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10 | // |
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11 | // Copyright (c) 2008 Peter Dimov |
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12 | // |
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13 | // Distributed under the Boost Software License, Version 1.0. |
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14 | // See accompanying file LICENSE_1_0.txt or copy at |
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15 | // http://www.boost.org/LICENSE_1_0.txt) |
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16 | // |
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17 | |
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18 | #include <boost/assert.hpp> |
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19 | |
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20 | namespace boost |
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21 | { |
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22 | |
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23 | namespace detail |
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24 | { |
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25 | |
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26 | class spinlock |
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27 | { |
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28 | public: |
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29 | |
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30 | bool locked_; |
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31 | |
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32 | public: |
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33 | |
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34 | inline bool try_lock() |
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35 | { |
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36 | if( locked_ ) |
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37 | { |
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38 | return false; |
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39 | } |
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40 | else |
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41 | { |
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42 | locked_ = true; |
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43 | return true; |
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44 | } |
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45 | } |
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46 | |
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47 | inline void lock() |
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48 | { |
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49 | BOOST_ASSERT( !locked_ ); |
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50 | locked_ = true; |
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51 | } |
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52 | |
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53 | inline void unlock() |
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54 | { |
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55 | BOOST_ASSERT( locked_ ); |
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56 | locked_ = false; |
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57 | } |
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58 | |
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59 | public: |
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60 | |
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61 | class scoped_lock |
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62 | { |
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63 | private: |
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64 | |
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65 | spinlock & sp_; |
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66 | |
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67 | scoped_lock( scoped_lock const & ); |
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68 | scoped_lock & operator=( scoped_lock const & ); |
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69 | |
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70 | public: |
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71 | |
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72 | explicit scoped_lock( spinlock & sp ): sp_( sp ) |
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73 | { |
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74 | sp.lock(); |
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75 | } |
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76 | |
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77 | ~scoped_lock() |
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78 | { |
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79 | sp_.unlock(); |
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80 | } |
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81 | }; |
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82 | }; |
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83 | |
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84 | } // namespace detail |
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85 | } // namespace boost |
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86 | |
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87 | #define BOOST_DETAIL_SPINLOCK_INIT { false } |
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88 | |
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89 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_NT_HPP_INCLUDED |
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