boost/smart_ptr/detail/lwm_pthreads.hpp

   1 #ifndef BOOST_SMART_PTR_DETAIL_LWM_PTHREADS_HPP_INCLUDED
   2 #define BOOST_SMART_PTR_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 <boost/assert.hpp>
  21 #include <pthread.h>
  22
  23 namespace boost
  24 {
  25
  26 namespace detail
  27 {
  28
  29 class lightweight_mutex
  30 {
  31 private:
  32
  33     pthread_mutex_t m_;
  34
  35     lightweight_mutex(lightweight_mutex const &);
  36     lightweight_mutex & operator=(lightweight_mutex const &);
  37
  38 public:
  39
  40     lightweight_mutex()
  41     {
  42
  43 // HPUX 10.20 / DCE has a nonstandard pthread_mutex_init
  44
  45 #if defined(__hpux) && defined(_DECTHREADS_)
  46         BOOST_VERIFY( pthread_mutex_init( &m_, pthread_mutexattr_default ) == 0 );
  47 #else
  48         BOOST_VERIFY( pthread_mutex_init( &m_, 0 ) == 0 );
  49 #endif
  50     }
  51
  52     ~lightweight_mutex()
  53     {
  54         BOOST_VERIFY( pthread_mutex_destroy( &m_ ) == 0 );
  55     }
  56
  57     class scoped_lock;
  58     friend class scoped_lock;
  59
  60     class scoped_lock
  61     {
  62     private:
  63
  64         pthread_mutex_t & m_;
  65
  66         scoped_lock(scoped_lock const &);
  67         scoped_lock & operator=(scoped_lock const &);
  68
  69     public:
  70
  71         scoped_lock(lightweight_mutex & m): m_(m.m_)
  72         {
  73             BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
  74         }
  75
  76         ~scoped_lock()
  77         {
  78             BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
  79         }
  80     };
  81 };
  82
  83 } // namespace detail
  84
  85 } // namespace boost
  86
  87 #endif // #ifndef BOOST_SMART_PTR_DETAIL_LWM_PTHREADS_HPP_INCLUDED