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1 | #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_PT_HPP_INCLUDED |
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2 | #define BOOST_SMART_PTR_DETAIL_SPINLOCK_PT_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 <pthread.h> |
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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 | pthread_mutex_t v_; |
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31 | |
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32 | public: |
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33 | |
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34 | bool try_lock() |
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35 | { |
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36 | return pthread_mutex_trylock( &v_ ) == 0; |
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37 | } |
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38 | |
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39 | void lock() |
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40 | { |
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41 | pthread_mutex_lock( &v_ ); |
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42 | } |
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43 | |
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44 | void unlock() |
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45 | { |
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46 | pthread_mutex_unlock( &v_ ); |
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47 | } |
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48 | |
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49 | public: |
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50 | |
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51 | class scoped_lock |
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52 | { |
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53 | private: |
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54 | |
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55 | spinlock & sp_; |
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56 | |
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57 | scoped_lock( scoped_lock const & ); |
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58 | scoped_lock & operator=( scoped_lock const & ); |
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59 | |
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60 | public: |
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61 | |
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62 | explicit scoped_lock( spinlock & sp ): sp_( sp ) |
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63 | { |
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64 | sp.lock(); |
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65 | } |
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66 | |
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67 | ~scoped_lock() |
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68 | { |
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69 | sp_.unlock(); |
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70 | } |
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71 | }; |
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72 | }; |
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73 | |
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74 | } // namespace detail |
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75 | } // namespace boost |
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76 | |
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77 | #define BOOST_DETAIL_SPINLOCK_INIT { PTHREAD_MUTEX_INITIALIZER } |
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78 | |
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79 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_PT_HPP_INCLUDED |
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