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236 lines
6.3 KiB
C++
236 lines
6.3 KiB
C++
/*
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* Copyright Andrey Semashev 2007 - 2015.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*/
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/*!
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* \file adaptive_mutex.hpp
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* \author Andrey Semashev
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* \date 01.08.2010
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*
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* \brief This header is the Boost.Log library implementation, see the library documentation
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* at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
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*/
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#ifndef BOOST_LOG_DETAIL_ADAPTIVE_MUTEX_HPP_INCLUDED_
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#define BOOST_LOG_DETAIL_ADAPTIVE_MUTEX_HPP_INCLUDED_
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#include <boost/log/detail/config.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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#ifndef BOOST_LOG_NO_THREADS
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#include <boost/throw_exception.hpp>
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#include <boost/thread/exceptions.hpp>
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#if defined(BOOST_THREAD_POSIX) // This one can be defined by users, so it should go first
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#define BOOST_LOG_ADAPTIVE_MUTEX_USE_PTHREAD
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#elif defined(BOOST_WINDOWS)
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#define BOOST_LOG_ADAPTIVE_MUTEX_USE_WINAPI
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#elif defined(BOOST_HAS_PTHREADS)
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#define BOOST_LOG_ADAPTIVE_MUTEX_USE_PTHREAD
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#endif
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#if defined(BOOST_LOG_ADAPTIVE_MUTEX_USE_WINAPI)
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#include <boost/log/detail/pause.hpp>
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#include <boost/detail/interlocked.hpp>
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#include <boost/detail/winapi/thread.hpp>
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#if defined(__INTEL_COMPILER) || defined(_MSC_VER)
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# if defined(__INTEL_COMPILER)
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# define BOOST_LOG_COMPILER_BARRIER __memory_barrier()
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# else
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extern "C" void _ReadWriteBarrier(void);
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# if defined(BOOST_MSVC)
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# pragma intrinsic(_ReadWriteBarrier)
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# endif
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# define BOOST_LOG_COMPILER_BARRIER _ReadWriteBarrier()
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# endif
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#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
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# define BOOST_LOG_COMPILER_BARRIER __asm__ __volatile__("" : : : "memory")
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#endif
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#include <boost/log/detail/header.hpp>
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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namespace aux {
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//! A mutex that performs spinning or thread yielding in case of contention
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class adaptive_mutex
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{
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private:
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enum state
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{
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initial_pause = 2,
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max_pause = 16
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};
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long m_State;
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public:
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adaptive_mutex() : m_State(0) {}
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bool try_lock()
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{
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return (BOOST_INTERLOCKED_COMPARE_EXCHANGE(&m_State, 1L, 0L) == 0L);
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}
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void lock()
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{
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#if defined(BOOST_LOG_AUX_PAUSE)
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unsigned int pause_count = initial_pause;
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#endif
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while (!try_lock())
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{
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#if defined(BOOST_LOG_AUX_PAUSE)
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if (pause_count < max_pause)
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{
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for (unsigned int i = 0; i < pause_count; ++i)
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{
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BOOST_LOG_AUX_PAUSE;
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}
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pause_count += pause_count;
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}
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else
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{
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// Restart spinning after waking up this thread
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pause_count = initial_pause;
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SwitchToThread();
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}
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#else
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SwitchToThread();
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#endif
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}
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}
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void unlock()
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{
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#if (defined(_M_IX86) || defined(_M_AMD64)) && defined(BOOST_LOG_COMPILER_BARRIER)
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BOOST_LOG_COMPILER_BARRIER;
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m_State = 0L;
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BOOST_LOG_COMPILER_BARRIER;
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#else
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BOOST_INTERLOCKED_EXCHANGE(&m_State, 0L);
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#endif
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}
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// Non-copyable
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BOOST_DELETED_FUNCTION(adaptive_mutex(adaptive_mutex const&))
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BOOST_DELETED_FUNCTION(adaptive_mutex& operator= (adaptive_mutex const&))
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};
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#undef BOOST_LOG_AUX_PAUSE
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#undef BOOST_LOG_COMPILER_BARRIER
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} // namespace aux
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BOOST_LOG_CLOSE_NAMESPACE // namespace log
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} // namespace boost
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#include <boost/log/detail/footer.hpp>
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#elif defined(BOOST_LOG_ADAPTIVE_MUTEX_USE_PTHREAD)
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#include <pthread.h>
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#include <boost/assert.hpp>
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#include <boost/log/detail/header.hpp>
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#if defined(PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
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#define BOOST_LOG_ADAPTIVE_MUTEX_USE_PTHREAD_MUTEX_ADAPTIVE_NP
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#endif
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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namespace aux {
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//! A mutex that performs spinning or thread yielding in case of contention
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class adaptive_mutex
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{
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private:
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pthread_mutex_t m_State;
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public:
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adaptive_mutex()
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{
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#if defined(BOOST_LOG_ADAPTIVE_MUTEX_USE_PTHREAD_MUTEX_ADAPTIVE_NP)
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pthread_mutexattr_t attrs;
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pthread_mutexattr_init(&attrs);
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pthread_mutexattr_settype(&attrs, PTHREAD_MUTEX_ADAPTIVE_NP);
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const int err = pthread_mutex_init(&m_State, &attrs);
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pthread_mutexattr_destroy(&attrs);
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#else
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const int err = pthread_mutex_init(&m_State, NULL);
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#endif
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if (BOOST_UNLIKELY(err != 0))
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throw_exception< thread_resource_error >(err, "Failed to initialize an adaptive mutex", "adaptive_mutex::adaptive_mutex()", __FILE__, __LINE__);
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}
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~adaptive_mutex()
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{
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BOOST_VERIFY(pthread_mutex_destroy(&m_State) == 0);
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}
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bool try_lock()
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{
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const int err = pthread_mutex_trylock(&m_State);
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if (err == 0)
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return true;
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if (BOOST_UNLIKELY(err != EBUSY))
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throw_exception< lock_error >(err, "Failed to lock an adaptive mutex", "adaptive_mutex::try_lock()", __FILE__, __LINE__);
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return false;
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}
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void lock()
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{
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const int err = pthread_mutex_lock(&m_State);
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if (BOOST_UNLIKELY(err != 0))
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throw_exception< lock_error >(err, "Failed to lock an adaptive mutex", "adaptive_mutex::lock()", __FILE__, __LINE__);
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}
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void unlock()
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{
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BOOST_VERIFY(pthread_mutex_unlock(&m_State) == 0);
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}
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// Non-copyable
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BOOST_DELETED_FUNCTION(adaptive_mutex(adaptive_mutex const&))
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BOOST_DELETED_FUNCTION(adaptive_mutex& operator= (adaptive_mutex const&))
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private:
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template< typename ExceptionT >
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static BOOST_NOINLINE BOOST_LOG_NORETURN void throw_exception(int err, const char* descr, const char* func, const char* file, int line)
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{
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#if !defined(BOOST_EXCEPTION_DISABLE)
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boost::exception_detail::throw_exception_(ExceptionT(err, descr), func, file, line);
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#else
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boost::throw_exception(ExceptionT(err, descr));
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#endif
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}
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};
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} // namespace aux
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BOOST_LOG_CLOSE_NAMESPACE // namespace log
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} // namespace boost
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#include <boost/log/detail/footer.hpp>
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#endif
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#endif // BOOST_LOG_NO_THREADS
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#endif // BOOST_LOG_DETAIL_ADAPTIVE_MUTEX_HPP_INCLUDED_
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