boost/smart_ptr/detail/spinlock_pt.hpp

   1 #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_PT_HPP_INCLUDED
   2 #define BOOST_SMART_PTR_DETAIL_SPINLOCK_PT_HPP_INCLUDED
   3
   4 // MS compatible compilers support #pragma once
   5
   6 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
   7 # pragma once
   8 #endif
   9
  10 //
  11 //  Copyright (c) 2008 Peter Dimov
  12 //
  13 //  Distributed under the Boost Software License, Version 1.0.
  14 //  See accompanying file LICENSE_1_0.txt or copy at
  15 //  http://www.boost.org/LICENSE_1_0.txt)
  16 //
  17
  18 #include <pthread.h>
  19
  20 namespace boost
  21 {
  22
  23 namespace detail
  24 {
  25
  26 class spinlock
  27 {
  28 public:
  29
  30     pthread_mutex_t v_;
  31
  32 public:
  33
  34     bool try_lock()
  35     {
  36         return pthread_mutex_trylock( &v_ ) == 0;
  37     }
  38
  39     void lock()
  40     {
  41         pthread_mutex_lock( &v_ );
  42     }
  43
  44     void unlock()
  45     {
  46         pthread_mutex_unlock( &v_ );
  47     }
  48
  49 public:
  50
  51     class scoped_lock
  52     {
  53     private:
  54
  55         spinlock & sp_;
  56
  57         scoped_lock( scoped_lock const & );
  58         scoped_lock & operator=( scoped_lock const & );
  59
  60     public:
  61
  62         explicit scoped_lock( spinlock & sp ): sp_( sp )
  63         {
  64             sp.lock();
  65         }
  66
  67         ~scoped_lock()
  68         {
  69             sp_.unlock();
  70         }
  71     };
  72 };
  73
  74 } // namespace detail
  75 } // namespace boost
  76
  77 #define BOOST_DETAIL_SPINLOCK_INIT { PTHREAD_MUTEX_INITIALIZER }
  78
  79 #endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_PT_HPP_INCLUDED