boost/boost/detail/lwm_pthreads.hpp

   1 #ifndef BOOST_DETAIL_LWM_PTHREADS_HPP_INCLUDED
   2 #define BOOST_DETAIL_LWM_PTHREADS_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 //  boost/detail/lwm_pthreads.hpp
  12 //
  13 //  Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
  14 //
  15 // Distributed under the Boost Software License, Version 1.0. (See
  16 // accompanying file LICENSE_1_0.txt or copy at
  17 // http://www.boost.org/LICENSE_1_0.txt)
  18 //
  19
  20 #include <pthread.h>
  21
  22 namespace boost
  23 {
  24
  25 namespace detail
  26 {
  27
  28 class lightweight_mutex
  29 {
  30 private:
  31
  32     pthread_mutex_t m_;
  33
  34     lightweight_mutex(lightweight_mutex const &);
  35     lightweight_mutex & operator=(lightweight_mutex const &);
  36
  37 public:
  38
  39     lightweight_mutex()
  40     {
  41
  42 // HPUX 10.20 / DCE has a nonstandard pthread_mutex_init
  43
  44 #if defined(__hpux) && defined(_DECTHREADS_)
  45         pthread_mutex_init(&m_, pthread_mutexattr_default);
  46 #else
  47         pthread_mutex_init(&m_, 0);
  48 #endif
  49     }
  50
  51     ~lightweight_mutex()
  52     {
  53         pthread_mutex_destroy(&m_);
  54     }
  55
  56     class scoped_lock;
  57     friend class scoped_lock;
  58
  59     class scoped_lock
  60     {
  61     private:
  62
  63         pthread_mutex_t & m_;
  64
  65         scoped_lock(scoped_lock const &);
  66         scoped_lock & operator=(scoped_lock const &);
  67
  68     public:
  69
  70         scoped_lock(lightweight_mutex & m): m_(m.m_)
  71         {
  72             pthread_mutex_lock(&m_);
  73         }
  74
  75         ~scoped_lock()
  76         {
  77             pthread_mutex_unlock(&m_);
  78         }
  79     };
  80 };
  81
  82 } // namespace detail
  83
  84 } // namespace boost
  85
  86 #endif // #ifndef BOOST_DETAIL_LWM_PTHREADS_HPP_INCLUDED