boost/boost/detail/lwm_pthreads.hpp

   1 #ifndef BOOST_DETAIL_LWM_PTHREADS_HPP_INCLUDED
   2 #define BOOST_DETAIL_LWM_PTHREADS_HPP_INCLUDED
   3
   4 #if _MSC_VER >= 1020
   5 #pragma once
   6 #endif
   7
   8 //
   9 //  boost/detail/lwm_pthreads.hpp
  10 //
  11 //  Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
  12 //
  13 //  Permission to copy, use, modify, sell and distribute this software
  14 //  is granted provided this copyright notice appears in all copies.
  15 //  This software is provided "as is" without express or implied
  16 //  warranty, and with no claim as to its suitability for any purpose.
  17 //
  18
  19 #include <pthread.h>
  20
  21 namespace boost
  22 {
  23
  24 namespace detail
  25 {
  26
  27 class lightweight_mutex
  28 {
  29 private:
  30
  31     pthread_mutex_t m_;
  32
  33     lightweight_mutex(lightweight_mutex const &);
  34     lightweight_mutex & operator=(lightweight_mutex const &);
  35
  36 public:
  37
  38     lightweight_mutex()
  39     {
  40
  41 // HPUX 10.20 / DCE has a nonstandard pthread_mutex_init
  42
  43 #if defined(__hpux) && defined(_DECTHREADS_)
  44         pthread_mutex_init(&m_, pthread_mutexattr_default);
  45 #else
  46         pthread_mutex_init(&m_, 0);
  47 #endif
  48     }
  49
  50     ~lightweight_mutex()
  51     {
  52         pthread_mutex_destroy(&m_);
  53     }
  54
  55     class scoped_lock;
  56     friend class scoped_lock;
  57
  58     class scoped_lock
  59     {
  60     private:
  61
  62         pthread_mutex_t & m_;
  63
  64         scoped_lock(scoped_lock const &);
  65         scoped_lock & operator=(scoped_lock const &);
  66
  67     public:
  68
  69         scoped_lock(lightweight_mutex & m): m_(m.m_)
  70         {
  71             pthread_mutex_lock(&m_);
  72         }
  73
  74         ~scoped_lock()
  75         {
  76             pthread_mutex_unlock(&m_);
  77         }
  78     };
  79 };
  80
  81 } // namespace detail
  82
  83 } // namespace boost
  84
  85 #endif // #ifndef BOOST_DETAIL_LWM_PTHREADS_HPP_INCLUDED