| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // (C) Copyright Ion Gaztanaga 2005-2009. Distributed under the Boost |
| // Software License, Version 1.0. (See accompanying file |
| // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| // |
| // See http://www.boost.org/libs/interprocess for documentation. |
| // |
| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // Parts of the pthread code come from Boost Threads code: |
| // |
| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // Copyright (C) 2001-2003 |
| // William E. Kempf |
| // |
| // Permission to use, copy, modify, distribute and sell this software |
| // and its documentation for any purpose is hereby granted without fee, |
| // provided that the above copyright notice appear in all copies and |
| // that both that copyright notice and this permission notice appear |
| // in supporting documentation. William E. Kempf makes no representations |
| // about the suitability of this software for any purpose. |
| // It is provided "as is" without express or implied warranty. |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| #include <boost/interprocess/sync/posix/ptime_to_timespec.hpp> |
| #include <boost/interprocess/detail/posix_time_types_wrk.hpp> |
| #include <boost/interprocess/exceptions.hpp> |
| #ifndef BOOST_INTERPROCESS_POSIX_TIMEOUTS |
| # include <boost/interprocess/detail/os_thread_functions.hpp> |
| #endif |
| #include <boost/assert.hpp> |
| |
| namespace boost { |
| |
| namespace interprocess { |
| |
| inline interprocess_recursive_mutex::interprocess_recursive_mutex() |
| { |
| detail::mutexattr_wrapper mut_attr(true); |
| detail::mutex_initializer mut(m_mut, mut_attr); |
| mut.release(); |
| } |
| |
| inline interprocess_recursive_mutex::~interprocess_recursive_mutex() |
| { |
| int res = pthread_mutex_destroy(&m_mut); |
| BOOST_ASSERT(res == 0);(void)res; |
| } |
| |
| inline void interprocess_recursive_mutex::lock() |
| { |
| if (pthread_mutex_lock(&m_mut) != 0) |
| throw lock_exception(); |
| } |
| |
| inline bool interprocess_recursive_mutex::try_lock() |
| { |
| int res = pthread_mutex_trylock(&m_mut); |
| if (!(res == 0 || res == EBUSY)) |
| throw lock_exception(); |
| return res == 0; |
| } |
| |
| inline bool interprocess_recursive_mutex::timed_lock(const boost::posix_time::ptime &abs_time) |
| { |
| if(abs_time == boost::posix_time::pos_infin){ |
| this->lock(); |
| return true; |
| } |
| #ifdef BOOST_INTERPROCESS_POSIX_TIMEOUTS |
| |
| timespec ts = detail::ptime_to_timespec(abs_time); |
| int res = pthread_mutex_timedlock(&m_mut, &ts); |
| if (res != 0 && res != ETIMEDOUT) |
| throw lock_exception(); |
| return res == 0; |
| |
| #else //BOOST_INTERPROCESS_POSIX_TIMEOUTS |
| |
| //Obtain current count and target time |
| boost::posix_time::ptime now = microsec_clock::universal_time(); |
| |
| if(now >= abs_time) return false; |
| |
| do{ |
| if(this->try_lock()){ |
| break; |
| } |
| now = microsec_clock::universal_time(); |
| |
| if(now >= abs_time){ |
| return false; |
| } |
| // relinquish current time slice |
| detail::thread_yield(); |
| }while (true); |
| return true; |
| |
| #endif //BOOST_INTERPROCESS_POSIX_TIMEOUTS |
| } |
| |
| inline void interprocess_recursive_mutex::unlock() |
| { |
| int res = 0; |
| res = pthread_mutex_unlock(&m_mut); |
| BOOST_ASSERT(res == 0); |
| } |
| |
| } //namespace interprocess { |
| } //namespace boost { |