| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // (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. |
| // |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| #include<boost/interprocess/exceptions.hpp> |
| #include <boost/interprocess/detail/posix_time_types_wrk.hpp> |
| |
| namespace boost { |
| namespace interprocess { |
| |
| |
| inline interprocess_semaphore::~interprocess_semaphore() |
| {} |
| |
| inline interprocess_semaphore::interprocess_semaphore(unsigned int initialCount) |
| { detail::atomic_write32(&this->m_count, boost::uint32_t(initialCount)); } |
| |
| inline void interprocess_semaphore::post() |
| { |
| detail::atomic_inc32(&m_count); |
| } |
| |
| inline void interprocess_semaphore::wait() |
| { |
| while(!detail::atomic_add_unless32(&m_count, boost::uint32_t(-1), boost::uint32_t(0))){ |
| while(detail::atomic_read32(&m_count) == 0){ |
| detail::thread_yield(); |
| } |
| } |
| } |
| |
| inline bool interprocess_semaphore::try_wait() |
| { |
| return detail::atomic_add_unless32(&m_count, boost::uint32_t(-1), boost::uint32_t(0)); |
| } |
| |
| inline bool interprocess_semaphore::timed_wait(const boost::posix_time::ptime &abs_time) |
| { |
| if(abs_time == boost::posix_time::pos_infin){ |
| this->wait(); |
| return true; |
| } |
| //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_wait()){ |
| break; |
| } |
| now = microsec_clock::universal_time(); |
| |
| if(now >= abs_time){ |
| return this->try_wait(); |
| } |
| // relinquish current time slice |
| detail::thread_yield(); |
| }while (true); |
| return true; |
| } |
| /* |
| inline int interprocess_semaphore::get_count() const |
| { |
| return (int)detail::atomic_read32(&m_count); |
| }*/ |
| |
| } //namespace interprocess { |
| } //namespace boost { |