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_DETAIL_SPIN_SEMAPHORE_HPP
Chris@16: #define BOOST_INTERPROCESS_DETAIL_SPIN_SEMAPHORE_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: #include <boost/interprocess/detail/atomic.hpp>
Chris@16: #include <boost/interprocess/detail/os_thread_functions.hpp>
Chris@16: #include <boost/interprocess/detail/posix_time_types_wrk.hpp>
Chris@101: #include <boost/interprocess/sync/detail/common_algorithms.hpp>
Chris@101: #include <boost/interprocess/sync/detail/locks.hpp>
Chris@16: #include <boost/cstdint.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace interprocess {
Chris@16: namespace ipcdetail {
Chris@16: 
Chris@16: class spin_semaphore
Chris@16: {
Chris@16:    spin_semaphore(const spin_semaphore &);
Chris@16:    spin_semaphore &operator=(const spin_semaphore &);
Chris@16: 
Chris@16:    public:
Chris@16:    spin_semaphore(unsigned int initialCount);
Chris@16:    ~spin_semaphore();
Chris@16: 
Chris@16:    void post();
Chris@16:    void wait();
Chris@16:    bool try_wait();
Chris@16:    bool timed_wait(const boost::posix_time::ptime &abs_time);
Chris@16: 
Chris@16: //   int get_count() const;
Chris@16:    private:
Chris@16:    volatile boost::uint32_t m_count;
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: inline spin_semaphore::~spin_semaphore()
Chris@16: {}
Chris@16: 
Chris@16: inline spin_semaphore::spin_semaphore(unsigned int initialCount)
Chris@16: {  ipcdetail::atomic_write32(&this->m_count, boost::uint32_t(initialCount));  }
Chris@16: 
Chris@16: inline void spin_semaphore::post()
Chris@16: {
Chris@16:    ipcdetail::atomic_inc32(&m_count);
Chris@16: }
Chris@16: 
Chris@16: inline void spin_semaphore::wait()
Chris@16: {
Chris@101:    ipcdetail::lock_to_wait<spin_semaphore> lw(*this);
Chris@101:    return ipcdetail::try_based_lock(lw);
Chris@16: }
Chris@16: 
Chris@16: inline bool spin_semaphore::try_wait()
Chris@16: {
Chris@16:    return ipcdetail::atomic_add_unless32(&m_count, boost::uint32_t(-1), boost::uint32_t(0));
Chris@16: }
Chris@16: 
Chris@16: inline bool spin_semaphore::timed_wait(const boost::posix_time::ptime &abs_time)
Chris@16: {
Chris@101:    ipcdetail::lock_to_wait<spin_semaphore> lw(*this);
Chris@101:    return ipcdetail::try_based_timed_lock(lw, abs_time);
Chris@16: }
Chris@16: 
Chris@16: //inline int spin_semaphore::get_count() const
Chris@16: //{
Chris@16:    //return (int)ipcdetail::atomic_read32(&m_count);
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   //BOOST_INTERPROCESS_DETAIL_SPIN_SEMAPHORE_HPP