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420 lines
8.7 KiB
C++
420 lines
8.7 KiB
C++
//
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// AtomicCounter.h
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//
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// Library: Foundation
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// Package: Core
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// Module: AtomicCounter
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//
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// Definition of the AtomicCounter class.
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//
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// Copyright (c) 2009, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_AtomicCounter_INCLUDED
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#define Foundation_AtomicCounter_INCLUDED
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#include "Poco/Foundation.h"
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#if POCO_OS == POCO_OS_WINDOWS_NT
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# include "Poco/UnWindows.h"
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#elif POCO_OS == POCO_OS_MAC_OS_X
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# if __MAC_OS_X_VERSION_MAX_ALLOWED >= 101200 || __IPHONE_OS_VERSION_MAX_ALLOWED >= 100000 || __TV_OS_VERSION_MAX_ALLOWED >= 100000 \
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|| __WATCH_OS_VERSION_MAX_ALLOWED >= 30000
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# if __cplusplus >= 201103L
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# ifndef POCO_HAVE_STD_ATOMICS
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# define POCO_HAVE_STD_ATOMICS
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# endif
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# else
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# include <libkern/OSAtomic.h>
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# endif
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# else
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# include <libkern/OSAtomic.h>
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# endif
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#elif ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2) || __GNUC__ > 4) && (defined(__x86_64__) || defined(__i386__))
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# if !defined(POCO_HAVE_GCC_ATOMICS) && !defined(POCO_NO_GCC_ATOMICS)
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# define POCO_HAVE_GCC_ATOMICS
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# endif
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#elif ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3) || __GNUC__ > 4)
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# if !defined(POCO_HAVE_GCC_ATOMICS) && !defined(POCO_NO_GCC_ATOMICS)
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# define POCO_HAVE_GCC_ATOMICS
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# endif
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#endif // POCO_OS
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#include "Poco/Mutex.h"
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#ifdef POCO_HAVE_STD_ATOMICS
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# include <atomic>
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#endif
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namespace Poco
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{
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class Foundation_API AtomicCounter
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/// This class implements a simple counter, which
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/// provides atomic operations that are safe to
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/// use in a multithreaded environment.
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///
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/// Typical usage of AtomicCounter is for implementing
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/// reference counting and similar things.
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///
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/// On some platforms, the implementation of AtomicCounter
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/// is based on atomic primitives specific to the platform
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/// (such as InterlockedIncrement, etc. on Windows), and
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/// thus very efficient. On platforms that do not support
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/// atomic primitives, operations are guarded by a FastMutex.
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///
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/// The following platforms currently have atomic
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/// primitives:
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/// - Windows
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/// - Mac OS X
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/// - GCC 4.1+ (Intel platforms only)
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{
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public:
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typedef int ValueType; /// The underlying integer type.
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AtomicCounter();
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/// Creates a new AtomicCounter and initializes it to zero.
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explicit AtomicCounter(ValueType initialValue);
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/// Creates a new AtomicCounter and initializes it with
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/// the given value.
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AtomicCounter(const AtomicCounter & counter);
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/// Creates the counter by copying another one.
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~AtomicCounter();
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/// Destroys the AtomicCounter.
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AtomicCounter & operator=(const AtomicCounter & counter);
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/// Assigns the value of another AtomicCounter.
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AtomicCounter & operator=(ValueType value);
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/// Assigns a value to the counter.
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operator ValueType() const;
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/// Returns the value of the counter.
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ValueType value() const;
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/// Returns the value of the counter.
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ValueType operator++(); // prefix
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/// Increments the counter and returns the result.
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ValueType operator++(int); // postfix
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/// Increments the counter and returns the previous value.
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ValueType operator--(); // prefix
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/// Decrements the counter and returns the result.
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ValueType operator--(int); // postfix
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/// Decrements the counter and returns the previous value.
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bool operator!() const;
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/// Returns true if the counter is zero, false otherwise.
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private:
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#if defined(POCO_HAVE_STD_ATOMICS)
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typedef std::atomic<int> ImplType;
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#elif POCO_OS == POCO_OS_WINDOWS_NT
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typedef volatile LONG ImplType;
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#elif POCO_OS == POCO_OS_MAC_OS_X
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typedef int32_t ImplType;
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#elif defined(POCO_HAVE_GCC_ATOMICS)
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typedef int ImplType;
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#else // generic implementation based on FastMutex
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struct ImplType
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{
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mutable FastMutex mutex;
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volatile int value;
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};
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#endif // POCO_OS
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ImplType _counter;
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};
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//
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// inlines
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//
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#if defined(POCO_HAVE_STD_ATOMICS)
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//
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// C++11 atomics
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//
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inline AtomicCounter::operator AtomicCounter::ValueType() const
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{
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return _counter.load();
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}
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inline AtomicCounter::ValueType AtomicCounter::value() const
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{
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return _counter.load();
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}
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inline AtomicCounter::ValueType AtomicCounter::operator++() // prefix
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{
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return ++_counter;
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}
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inline AtomicCounter::ValueType AtomicCounter::operator++(int) // postfix
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{
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return _counter++;
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}
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inline AtomicCounter::ValueType AtomicCounter::operator--() // prefix
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{
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return --_counter;
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}
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inline AtomicCounter::ValueType AtomicCounter::operator--(int) // postfix
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{
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return _counter--;
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}
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inline bool AtomicCounter::operator!() const
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{
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return _counter.load() == 0;
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}
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#elif POCO_OS == POCO_OS_WINDOWS_NT
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//
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// Windows
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//
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inline AtomicCounter::operator AtomicCounter::ValueType() const
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{
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return _counter;
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}
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inline AtomicCounter::ValueType AtomicCounter::value() const
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{
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return _counter;
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}
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inline AtomicCounter::ValueType AtomicCounter::operator++() // prefix
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{
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return InterlockedIncrement(&_counter);
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}
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inline AtomicCounter::ValueType AtomicCounter::operator++(int) // postfix
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{
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ValueType result = InterlockedIncrement(&_counter);
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return --result;
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}
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inline AtomicCounter::ValueType AtomicCounter::operator--() // prefix
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{
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return InterlockedDecrement(&_counter);
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}
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inline AtomicCounter::ValueType AtomicCounter::operator--(int) // postfix
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{
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ValueType result = InterlockedDecrement(&_counter);
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return ++result;
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}
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inline bool AtomicCounter::operator!() const
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{
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return _counter == 0;
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}
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#elif POCO_OS == POCO_OS_MAC_OS_X
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//
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// Mac OS X
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//
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inline AtomicCounter::operator AtomicCounter::ValueType() const
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{
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return _counter;
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}
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inline AtomicCounter::ValueType AtomicCounter::value() const
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{
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return _counter;
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}
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inline AtomicCounter::ValueType AtomicCounter::operator++() // prefix
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{
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return OSAtomicIncrement32(&_counter);
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}
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inline AtomicCounter::ValueType AtomicCounter::operator++(int) // postfix
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{
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ValueType result = OSAtomicIncrement32(&_counter);
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return --result;
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}
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inline AtomicCounter::ValueType AtomicCounter::operator--() // prefix
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{
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return OSAtomicDecrement32(&_counter);
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}
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inline AtomicCounter::ValueType AtomicCounter::operator--(int) // postfix
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{
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ValueType result = OSAtomicDecrement32(&_counter);
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return ++result;
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}
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inline bool AtomicCounter::operator!() const
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{
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return _counter == 0;
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}
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#elif defined(POCO_HAVE_GCC_ATOMICS)
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//
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// GCC 4.1+ atomic builtins.
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//
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inline AtomicCounter::operator AtomicCounter::ValueType() const
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{
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return _counter;
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}
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inline AtomicCounter::ValueType AtomicCounter::value() const
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{
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return _counter;
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}
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inline AtomicCounter::ValueType AtomicCounter::operator++() // prefix
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{
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return __sync_add_and_fetch(&_counter, 1);
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}
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inline AtomicCounter::ValueType AtomicCounter::operator++(int) // postfix
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{
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return __sync_fetch_and_add(&_counter, 1);
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}
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inline AtomicCounter::ValueType AtomicCounter::operator--() // prefix
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{
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return __sync_sub_and_fetch(&_counter, 1);
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}
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inline AtomicCounter::ValueType AtomicCounter::operator--(int) // postfix
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{
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return __sync_fetch_and_sub(&_counter, 1);
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}
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inline bool AtomicCounter::operator!() const
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{
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return _counter == 0;
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}
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#else
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//
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// Generic implementation based on FastMutex
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//
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inline AtomicCounter::operator AtomicCounter::ValueType() const
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{
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ValueType result;
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{
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FastMutex::ScopedLock lock(_counter.mutex);
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result = _counter.value;
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}
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return result;
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}
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inline AtomicCounter::ValueType AtomicCounter::value() const
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{
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ValueType result;
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{
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FastMutex::ScopedLock lock(_counter.mutex);
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result = _counter.value;
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}
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return result;
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}
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inline AtomicCounter::ValueType AtomicCounter::operator++() // prefix
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{
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ValueType result;
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{
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FastMutex::ScopedLock lock(_counter.mutex);
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result = ++_counter.value;
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}
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return result;
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}
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inline AtomicCounter::ValueType AtomicCounter::operator++(int) // postfix
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{
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ValueType result;
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{
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FastMutex::ScopedLock lock(_counter.mutex);
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result = _counter.value++;
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}
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return result;
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}
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inline AtomicCounter::ValueType AtomicCounter::operator--() // prefix
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{
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ValueType result;
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{
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FastMutex::ScopedLock lock(_counter.mutex);
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result = --_counter.value;
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}
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return result;
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}
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inline AtomicCounter::ValueType AtomicCounter::operator--(int) // postfix
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{
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ValueType result;
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{
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FastMutex::ScopedLock lock(_counter.mutex);
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result = _counter.value--;
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}
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return result;
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}
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inline bool AtomicCounter::operator!() const
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{
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bool result;
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{
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FastMutex::ScopedLock lock(_counter.mutex);
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result = _counter.value == 0;
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}
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return result;
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}
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#endif // POCO_OS
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} // namespace Poco
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#endif // Foundation_AtomicCounter_INCLUDED
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