ceph/src/boost/libs/interprocess/include/boost/interprocess/sync/posix/mutex.hpp

   1 //////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost
   4 // Software License, Version 1.0. (See accompanying file
   5 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7 // See http://www.boost.org/libs/interprocess for documentation.
   8 //
   9 //////////////////////////////////////////////////////////////////////////////
  10 //
  11 // Parts of the pthread code come from Boost Threads code:
  12 //
  13 //////////////////////////////////////////////////////////////////////////////
  14 //
  15 // Copyright (C) 2001-2003
  16 // William E. Kempf
  17 //
  18 // Permission to use, copy, modify, distribute and sell this software
  19 // and its documentation for any purpose is hereby granted without fee,
  20 // provided that the above copyright notice appear in all copies and
  21 // that both that copyright notice and this permission notice appear
  22 // in supporting documentation.  William E. Kempf makes no representations
  23 // about the suitability of this software for any purpose.
  24 // It is provided "as is" without express or implied warranty.
  25 //////////////////////////////////////////////////////////////////////////////
  26
  27 #ifndef BOOST_INTERPROCESS_DETAIL_POSIX_MUTEX_HPP
  28 #define BOOST_INTERPROCESS_DETAIL_POSIX_MUTEX_HPP
  29
  30 #ifndef BOOST_CONFIG_HPP
  31 #  include <boost/config.hpp>
  32 #endif
  33 #
  34 #if defined(BOOST_HAS_PRAGMA_ONCE)
  35 #  pragma once
  36 #endif
  37
  38 #include <boost/interprocess/detail/config_begin.hpp>
  39 #include <boost/interprocess/detail/workaround.hpp>
  40
  41 #include <pthread.h>
  42 #include <errno.h>
  43 #include <boost/interprocess/exceptions.hpp>
  44 #include <boost/interprocess/sync/posix/ptime_to_timespec.hpp>
  45 #include <boost/interprocess/detail/posix_time_types_wrk.hpp>
  46 #include <boost/interprocess/exceptions.hpp>
  47 #include <boost/interprocess/sync/posix/pthread_helpers.hpp>
  48
  49 #ifndef BOOST_INTERPROCESS_POSIX_TIMEOUTS
  50 #  include <boost/interprocess/detail/os_thread_functions.hpp>
  51 #  include <boost/interprocess/sync/detail/common_algorithms.hpp>
  52 #endif
  53 #include <boost/assert.hpp>
  54
  55 namespace boost {
  56 namespace interprocess {
  57 namespace ipcdetail {
  58
  59 class posix_condition;
  60
  61 class posix_mutex
  62 {
  63    posix_mutex(const posix_mutex &);
  64    posix_mutex &operator=(const posix_mutex &);
  65    public:
  66
  67    posix_mutex();
  68    ~posix_mutex();
  69
  70    void lock();
  71    bool try_lock();
  72    bool timed_lock(const boost::posix_time::ptime &abs_time);
  73    void unlock();
  74
  75    friend class posix_condition;
  76
  77    private:
  78    pthread_mutex_t   m_mut;
  79 };
  80
  81 inline posix_mutex::posix_mutex()
  82 {
  83    mutexattr_wrapper mut_attr;
  84    mutex_initializer mut(m_mut, mut_attr);
  85    mut.release();
  86 }
  87
  88 inline posix_mutex::~posix_mutex()
  89 {
  90    int res = pthread_mutex_destroy(&m_mut);
  91    BOOST_ASSERT(res  == 0);(void)res;
  92 }
  93
  94 inline void posix_mutex::lock()
  95 {
  96    if (pthread_mutex_lock(&m_mut) != 0)
  97       throw lock_exception();
  98 }
  99
 100 inline bool posix_mutex::try_lock()
 101 {
 102    int res = pthread_mutex_trylock(&m_mut);
 103    if (!(res == 0 || res == EBUSY))
 104       throw lock_exception();
 105    return res == 0;
 106 }
 107
 108 inline bool posix_mutex::timed_lock(const boost::posix_time::ptime &abs_time)
 109 {
 110    #ifdef BOOST_INTERPROCESS_POSIX_TIMEOUTS
 111    //Posix does not support infinity absolute time so handle it here
 112    if(abs_time == boost::posix_time::pos_infin){
 113       this->lock();
 114       return true;
 115    }
 116    timespec ts = ptime_to_timespec(abs_time);
 117    int res = pthread_mutex_timedlock(&m_mut, &ts);
 118    if (res != 0 && res != ETIMEDOUT)
 119       throw lock_exception();
 120    return res == 0;
 121
 122    #else //BOOST_INTERPROCESS_POSIX_TIMEOUTS
 123
 124    return ipcdetail::try_based_timed_lock(*this, abs_time);
 125
 126    #endif   //BOOST_INTERPROCESS_POSIX_TIMEOUTS
 127 }
 128
 129 inline void posix_mutex::unlock()
 130 {
 131    int res = 0;
 132    res = pthread_mutex_unlock(&m_mut);
 133    (void)res;
 134    BOOST_ASSERT(res == 0);
 135 }
 136
 137 }  //namespace ipcdetail {
 138 }  //namespace interprocess {
 139 }  //namespace boost {
 140
 141 #include <boost/interprocess/detail/config_end.hpp>
 142
 143 #endif   //#ifndef BOOST_INTERPROCESS_DETAIL_POSIX_MUTEX_HPP