ceph/src/boost/libs/interprocess/include/boost/interprocess/sync/posix/condition.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 #ifndef BOOST_INTERPROCESS_POSIX_CONDITION_HPP
  12 #define BOOST_INTERPROCESS_POSIX_CONDITION_HPP
  13
  14 #ifndef BOOST_CONFIG_HPP
  15 #  include <boost/config.hpp>
  16 #endif
  17 #
  18 #if defined(BOOST_HAS_PRAGMA_ONCE)
  19 #  pragma once
  20 #endif
  21
  22 #include <boost/interprocess/detail/config_begin.hpp>
  23 #include <boost/interprocess/detail/workaround.hpp>
  24
  25 #include <pthread.h>
  26 #include <errno.h>
  27 #include <boost/interprocess/sync/posix/pthread_helpers.hpp>
  28 #include <boost/interprocess/sync/posix/ptime_to_timespec.hpp>
  29 #include <boost/interprocess/detail/posix_time_types_wrk.hpp>
  30 #include <boost/interprocess/sync/posix/mutex.hpp>
  31 #include <boost/assert.hpp>
  32
  33 namespace boost {
  34 namespace interprocess {
  35 namespace ipcdetail {
  36
  37 class posix_condition
  38 {
  39    //Non-copyable
  40    posix_condition(const posix_condition &);
  41    posix_condition &operator=(const posix_condition &);
  42
  43    public:
  44    //!Constructs a posix_condition. On error throws interprocess_exception.
  45    posix_condition();
  46
  47    //!Destroys *this
  48    //!liberating system resources.
  49    ~posix_condition();
  50
  51    //!If there is a thread waiting on *this, change that
  52    //!thread's state to ready. Otherwise there is no effect.
  53    void notify_one();
  54
  55    //!Change the state of all threads waiting on *this to ready.
  56    //!If there are no waiting threads, notify_all() has no effect.
  57    void notify_all();
  58
  59    //!Releases the lock on the posix_mutex object associated with lock, blocks
  60    //!the current thread of execution until readied by a call to
  61    //!this->notify_one() or this->notify_all(), and then reacquires the lock.
  62    template <typename L>
  63    void wait(L& lock)
  64    {
  65       if (!lock)
  66          throw lock_exception();
  67       this->do_wait(*lock.mutex());
  68    }
  69
  70    //!The same as:
  71    //!while (!pred()) wait(lock)
  72    template <typename L, typename Pr>
  73    void wait(L& lock, Pr pred)
  74    {
  75       if (!lock)
  76          throw lock_exception();
  77
  78       while (!pred())
  79          this->do_wait(*lock.mutex());
  80    }
  81
  82    //!Releases the lock on the posix_mutex object associated with lock, blocks
  83    //!the current thread of execution until readied by a call to
  84    //!this->notify_one() or this->notify_all(), or until time abs_time is reached,
  85    //!and then reacquires the lock.
  86    //!Returns: false if time abs_time is reached, otherwise true.
  87    template <typename L>
  88    bool timed_wait(L& lock, const boost::posix_time::ptime &abs_time)
  89    {
  90       if (!lock)
  91          throw lock_exception();
  92       //Posix does not support infinity absolute time so handle it here
  93       if(abs_time == boost::posix_time::pos_infin){
  94          this->wait(lock);
  95          return true;
  96       }
  97       return this->do_timed_wait(abs_time, *lock.mutex());
  98    }
  99
 100    //!The same as:   while (!pred()) {
 101    //!                  if (!timed_wait(lock, abs_time)) return pred();
 102    //!               } return true;
 103    template <typename L, typename Pr>
 104    bool timed_wait(L& lock, const boost::posix_time::ptime &abs_time, Pr pred)
 105    {
 106       if (!lock)
 107          throw lock_exception();
 108       //Posix does not support infinity absolute time so handle it here
 109       if(abs_time == boost::posix_time::pos_infin){
 110          this->wait(lock, pred);
 111          return true;
 112       }
 113       while (!pred()){
 114          if (!this->do_timed_wait(abs_time, *lock.mutex()))
 115             return pred();
 116       }
 117       return true;
 118    }
 119
 120
 121    void do_wait(posix_mutex &mut);
 122
 123    bool do_timed_wait(const boost::posix_time::ptime &abs_time, posix_mutex &mut);
 124
 125    private:
 126    pthread_cond_t   m_condition;
 127 };
 128
 129 inline posix_condition::posix_condition()
 130 {
 131    int res;
 132    pthread_condattr_t cond_attr;
 133    res = pthread_condattr_init(&cond_attr);
 134    if(res != 0){
 135       throw interprocess_exception("pthread_condattr_init failed");
 136    }
 137    res = pthread_condattr_setpshared(&cond_attr, PTHREAD_PROCESS_SHARED);
 138    if(res != 0){
 139       pthread_condattr_destroy(&cond_attr);
 140       throw interprocess_exception(res);
 141    }
 142    res = pthread_cond_init(&m_condition, &cond_attr);
 143    pthread_condattr_destroy(&cond_attr);
 144    if(res != 0){
 145       throw interprocess_exception(res);
 146    }
 147 }
 148
 149 inline posix_condition::~posix_condition()
 150 {
 151     int res = 0;
 152     res = pthread_cond_destroy(&m_condition);
 153     BOOST_ASSERT(res == 0); (void)res;
 154 }
 155
 156 inline void posix_condition::notify_one()
 157 {
 158     int res = 0;
 159     res = pthread_cond_signal(&m_condition);
 160     BOOST_ASSERT(res == 0); (void)res;
 161 }
 162
 163 inline void posix_condition::notify_all()
 164 {
 165     int res = 0;
 166     res = pthread_cond_broadcast(&m_condition);
 167     BOOST_ASSERT(res == 0); (void)res;
 168 }
 169
 170 inline void posix_condition::do_wait(posix_mutex &mut)
 171 {
 172    pthread_mutex_t* pmutex = &mut.m_mut;
 173    int res = 0;
 174    res = pthread_cond_wait(&m_condition, pmutex);
 175    BOOST_ASSERT(res == 0); (void)res;
 176 }
 177
 178 inline bool posix_condition::do_timed_wait
 179    (const boost::posix_time::ptime &abs_time, posix_mutex &mut)
 180 {
 181    timespec ts = ptime_to_timespec(abs_time);
 182    pthread_mutex_t* pmutex = &mut.m_mut;
 183    int res = 0;
 184    res = pthread_cond_timedwait(&m_condition, pmutex, &ts);
 185    BOOST_ASSERT(res == 0 || res == ETIMEDOUT);
 186
 187    return res != ETIMEDOUT;
 188 }
 189
 190 }  //namespace ipcdetail
 191 }  //namespace interprocess
 192 }  //namespace boost
 193
 194 #include <boost/interprocess/detail/config_end.hpp>
 195
 196 #endif   //#ifndef BOOST_INTERPROCESS_POSIX_CONDITION_HPP