ceph/src/boost/libs/interprocess/include/boost/interprocess/sync/posix/recursive_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_RECURSIVE_MUTEX_HPP
  28 #define BOOST_INTERPROCESS_DETAIL_POSIX_RECURSIVE_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/sync/posix/pthread_helpers.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 #ifndef BOOST_INTERPROCESS_POSIX_TIMEOUTS
  48 #  include <boost/interprocess/detail/os_thread_functions.hpp>
  49 #  include <boost/interprocess/sync/detail/common_algorithms.hpp>
  50 #endif
  51 #include <boost/assert.hpp>
  52
  53 namespace boost {
  54 namespace interprocess {
  55 namespace ipcdetail {
  56
  57 class posix_recursive_mutex
  58 {
  59    posix_recursive_mutex(const posix_recursive_mutex &);
  60    posix_recursive_mutex &operator=(const posix_recursive_mutex &);
  61    public:
  62
  63    posix_recursive_mutex();
  64    ~posix_recursive_mutex();
  65
  66    void lock();
  67    bool try_lock();
  68    bool timed_lock(const boost::posix_time::ptime &abs_time);
  69    void unlock();
  70
  71    private:
  72    pthread_mutex_t   m_mut;
  73 };
  74
  75 inline posix_recursive_mutex::posix_recursive_mutex()
  76 {
  77    mutexattr_wrapper mut_attr(true);
  78    mutex_initializer mut(m_mut, mut_attr);
  79    mut.release();
  80 }
  81
  82 inline posix_recursive_mutex::~posix_recursive_mutex()
  83 {
  84    int res = pthread_mutex_destroy(&m_mut);
  85    BOOST_ASSERT(res == 0);(void)res;
  86 }
  87
  88 inline void posix_recursive_mutex::lock()
  89 {
  90    if (pthread_mutex_lock(&m_mut) != 0)
  91       throw lock_exception();
  92 }
  93
  94 inline bool posix_recursive_mutex::try_lock()
  95 {
  96    int res = pthread_mutex_trylock(&m_mut);
  97    if (!(res == 0 || res == EBUSY))
  98       throw lock_exception();
  99    return res == 0;
 100 }
 101
 102 inline bool posix_recursive_mutex::timed_lock(const boost::posix_time::ptime &abs_time)
 103 {
 104    #ifdef BOOST_INTERPROCESS_POSIX_TIMEOUTS
 105    //Posix does not support infinity absolute time so handle it here
 106    if(abs_time == boost::posix_time::pos_infin){
 107       this->lock();
 108       return true;
 109    }
 110
 111    timespec ts = ptime_to_timespec(abs_time);
 112    int res = pthread_mutex_timedlock(&m_mut, &ts);
 113    if (res != 0 && res != ETIMEDOUT)
 114       throw lock_exception();
 115    return res == 0;
 116
 117    #else //BOOST_INTERPROCESS_POSIX_TIMEOUTS
 118
 119    return ipcdetail::try_based_timed_lock(*this, abs_time);
 120
 121    #endif   //BOOST_INTERPROCESS_POSIX_TIMEOUTS
 122 }
 123
 124 inline void posix_recursive_mutex::unlock()
 125 {
 126    int res = 0;
 127    res = pthread_mutex_unlock(&m_mut);
 128    BOOST_ASSERT(res == 0); (void)res;
 129 }
 130
 131 }  //namespace ipcdetail {
 132 }  //namespace interprocess {
 133 }  //namespace boost {
 134
 135 #include <boost/interprocess/detail/config_end.hpp>
 136
 137 #endif   //#ifndef BOOST_INTERPROCESS_DETAIL_POSIX_RECURSIVE_MUTEX_HPP