Chris@16: //////////////////////////////////////////////////////////////////////////////
Chris@16: //
Chris@16: // (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost
Chris@16: // Software License, Version 1.0. (See accompanying file
Chris@16: // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // See http://www.boost.org/libs/interprocess for documentation.
Chris@16: //
Chris@16: //////////////////////////////////////////////////////////////////////////////
Chris@16: 
Chris@16: #ifndef BOOST_INTERPROCESS_POSIX_CONDITION_HPP
Chris@16: #define BOOST_INTERPROCESS_POSIX_CONDITION_HPP
Chris@16: 
Chris@101: #ifndef BOOST_CONFIG_HPP
Chris@101: #  include <boost/config.hpp>
Chris@101: #endif
Chris@101: #
Chris@101: #if defined(BOOST_HAS_PRAGMA_ONCE)
Chris@16: #  pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/interprocess/detail/config_begin.hpp>
Chris@16: #include <boost/interprocess/detail/workaround.hpp>
Chris@16: 
Chris@16: #include <pthread.h>
Chris@16: #include <errno.h>
Chris@16: #include <boost/interprocess/sync/posix/pthread_helpers.hpp>
Chris@16: #include <boost/interprocess/sync/posix/ptime_to_timespec.hpp>
Chris@16: #include <boost/interprocess/detail/posix_time_types_wrk.hpp>
Chris@16: #include <boost/interprocess/sync/posix/mutex.hpp>
Chris@16: #include <boost/assert.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace interprocess {
Chris@16: namespace ipcdetail {
Chris@16: 
Chris@16: class posix_condition
Chris@16: {
Chris@16:    //Non-copyable
Chris@16:    posix_condition(const posix_condition &);
Chris@16:    posix_condition &operator=(const posix_condition &);
Chris@16: 
Chris@16:    public:
Chris@16:    //!Constructs a posix_condition. On error throws interprocess_exception.
Chris@16:    posix_condition();
Chris@16: 
Chris@16:    //!Destroys *this
Chris@16:    //!liberating system resources.
Chris@16:    ~posix_condition();
Chris@16: 
Chris@16:    //!If there is a thread waiting on *this, change that
Chris@16:    //!thread's state to ready. Otherwise there is no effect.
Chris@16:    void notify_one();
Chris@16: 
Chris@16:    //!Change the state of all threads waiting on *this to ready.
Chris@16:    //!If there are no waiting threads, notify_all() has no effect.
Chris@16:    void notify_all();
Chris@16: 
Chris@16:    //!Releases the lock on the posix_mutex object associated with lock, blocks
Chris@16:    //!the current thread of execution until readied by a call to
Chris@16:    //!this->notify_one() or this->notify_all(), and then reacquires the lock.
Chris@16:    template <typename L>
Chris@16:    void wait(L& lock)
Chris@16:    {
Chris@16:       if (!lock)
Chris@16:          throw lock_exception();
Chris@16:       this->do_wait(*lock.mutex());
Chris@16:    }
Chris@16: 
Chris@16:    //!The same as:
Chris@16:    //!while (!pred()) wait(lock)
Chris@16:    template <typename L, typename Pr>
Chris@16:    void wait(L& lock, Pr pred)
Chris@16:    {
Chris@16:       if (!lock)
Chris@16:          throw lock_exception();
Chris@16: 
Chris@16:       while (!pred())
Chris@16:          this->do_wait(*lock.mutex());
Chris@16:    }
Chris@16: 
Chris@16:    //!Releases the lock on the posix_mutex object associated with lock, blocks
Chris@16:    //!the current thread of execution until readied by a call to
Chris@16:    //!this->notify_one() or this->notify_all(), or until time abs_time is reached,
Chris@16:    //!and then reacquires the lock.
Chris@16:    //!Returns: false if time abs_time is reached, otherwise true.
Chris@16:    template <typename L>
Chris@16:    bool timed_wait(L& lock, const boost::posix_time::ptime &abs_time)
Chris@16:    {
Chris@101:       if (!lock)
Chris@101:          throw lock_exception();
Chris@101:       //Posix does not support infinity absolute time so handle it here
Chris@16:       if(abs_time == boost::posix_time::pos_infin){
Chris@16:          this->wait(lock);
Chris@16:          return true;
Chris@16:       }
Chris@16:       return this->do_timed_wait(abs_time, *lock.mutex());
Chris@16:    }
Chris@16: 
Chris@16:    //!The same as:   while (!pred()) {
Chris@16:    //!                  if (!timed_wait(lock, abs_time)) return pred();
Chris@16:    //!               } return true;
Chris@16:    template <typename L, typename Pr>
Chris@16:    bool timed_wait(L& lock, const boost::posix_time::ptime &abs_time, Pr pred)
Chris@16:    {
Chris@101:       if (!lock)
Chris@101:          throw lock_exception();
Chris@101:       //Posix does not support infinity absolute time so handle it here
Chris@16:       if(abs_time == boost::posix_time::pos_infin){
Chris@16:          this->wait(lock, pred);
Chris@16:          return true;
Chris@16:       }
Chris@16:       while (!pred()){
Chris@16:          if (!this->do_timed_wait(abs_time, *lock.mutex()))
Chris@16:             return pred();
Chris@16:       }
Chris@16:       return true;
Chris@16:    }
Chris@16: 
Chris@16: 
Chris@16:    void do_wait(posix_mutex &mut);
Chris@16: 
Chris@16:    bool do_timed_wait(const boost::posix_time::ptime &abs_time, posix_mutex &mut);
Chris@16: 
Chris@16:    private:
Chris@16:    pthread_cond_t   m_condition;
Chris@16: };
Chris@16: 
Chris@16: inline posix_condition::posix_condition()
Chris@16: {
Chris@16:    int res;
Chris@16:    pthread_condattr_t cond_attr;
Chris@16:    res = pthread_condattr_init(&cond_attr);
Chris@16:    if(res != 0){
Chris@16:       throw interprocess_exception("pthread_condattr_init failed");
Chris@16:    }
Chris@16:    res = pthread_condattr_setpshared(&cond_attr, PTHREAD_PROCESS_SHARED);
Chris@16:    if(res != 0){
Chris@16:       pthread_condattr_destroy(&cond_attr);
Chris@16:       throw interprocess_exception(res);
Chris@16:    }
Chris@16:    res = pthread_cond_init(&m_condition, &cond_attr);
Chris@16:    pthread_condattr_destroy(&cond_attr);
Chris@16:    if(res != 0){
Chris@16:       throw interprocess_exception(res);
Chris@16:    }
Chris@16: }
Chris@16: 
Chris@16: inline posix_condition::~posix_condition()
Chris@16: {
Chris@16:     int res = 0;
Chris@16:     res = pthread_cond_destroy(&m_condition);
Chris@16:     BOOST_ASSERT(res == 0); (void)res;
Chris@16: }
Chris@16: 
Chris@16: inline void posix_condition::notify_one()
Chris@16: {
Chris@16:     int res = 0;
Chris@16:     res = pthread_cond_signal(&m_condition);
Chris@16:     BOOST_ASSERT(res == 0); (void)res;
Chris@16: }
Chris@16: 
Chris@16: inline void posix_condition::notify_all()
Chris@16: {
Chris@16:     int res = 0;
Chris@16:     res = pthread_cond_broadcast(&m_condition);
Chris@16:     BOOST_ASSERT(res == 0); (void)res;
Chris@16: }
Chris@16: 
Chris@16: inline void posix_condition::do_wait(posix_mutex &mut)
Chris@16: {
Chris@16:    pthread_mutex_t* pmutex = &mut.m_mut;
Chris@16:    int res = 0;
Chris@16:    res = pthread_cond_wait(&m_condition, pmutex);
Chris@16:    BOOST_ASSERT(res == 0); (void)res;
Chris@16: }
Chris@16: 
Chris@16: inline bool posix_condition::do_timed_wait
Chris@16:    (const boost::posix_time::ptime &abs_time, posix_mutex &mut)
Chris@16: {
Chris@16:    timespec ts = ptime_to_timespec(abs_time);
Chris@16:    pthread_mutex_t* pmutex = &mut.m_mut;
Chris@16:    int res = 0;
Chris@16:    res = pthread_cond_timedwait(&m_condition, pmutex, &ts);
Chris@16:    BOOST_ASSERT(res == 0 || res == ETIMEDOUT);
Chris@16: 
Chris@16:    return res != ETIMEDOUT;
Chris@16: }
Chris@16: 
Chris@16: }  //namespace ipcdetail
Chris@16: }  //namespace interprocess
Chris@16: }  //namespace boost
Chris@16: 
Chris@16: #include <boost/interprocess/detail/config_end.hpp>
Chris@16: 
Chris@16: #endif   //#ifndef BOOST_INTERPROCESS_POSIX_CONDITION_HPP