94 lines
2.5 KiB
C++
94 lines
2.5 KiB
C++
/*
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Copyright (c) 2007-2015 by Jakob Schröter <js@camaya.net>
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This file is part of the gloox library. http://camaya.net/gloox
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This software is distributed under a license. The full license
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agreement can be found in the file LICENSE in this distribution.
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This software may not be copied, modified, sold or distributed
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other than expressed in the named license agreement.
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This software is distributed without any warranty.
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*/
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#include "atomicrefcount.h"
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#include "config.h"
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#if defined( _WIN32 ) && !defined( __SYMBIAN32__ )
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# include <windows.h>
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#elif defined( __APPLE__ )
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# include <libkern/OSAtomic.h>
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#elif defined( HAVE_GCC_ATOMIC_BUILTINS )
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// Use intrinsic functions - no #include required.
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#else
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# include "mutexguard.h"
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#endif
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#ifdef _WIN32_WCE
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# include <winbase.h>
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#endif
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namespace gloox
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{
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namespace util
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{
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AtomicRefCount::AtomicRefCount()
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: m_count( 0 )
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{
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}
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int AtomicRefCount::increment()
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{
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#if defined( _WIN32 ) && !defined( __SYMBIAN32__ )
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return (int) ::InterlockedIncrement( (volatile LONG*)&m_count );
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#elif defined( __APPLE__ )
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return (int) OSAtomicIncrement32Barrier( (volatile int32_t*)&m_count );
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#elif defined( HAVE_GCC_ATOMIC_BUILTINS )
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// Use the gcc intrinsic for atomic increment if supported.
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return (int) __sync_add_and_fetch( &m_count, 1 );
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#else
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// Fallback to using a lock
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MutexGuard m( m_lock );
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return ++m_count;
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#endif
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}
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int AtomicRefCount::decrement()
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{
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#if defined( _WIN32 ) && !defined( __SYMBIAN32__ )
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return (int) ::InterlockedDecrement( (volatile LONG*)&m_count );
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#elif defined( __APPLE__ )
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return (int) OSAtomicDecrement32Barrier( (volatile int32_t*)&m_count );
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#elif defined( HAVE_GCC_ATOMIC_BUILTINS )
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// Use the gcc intrinsic for atomic decrement if supported.
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return (int) __sync_sub_and_fetch( &m_count, 1 );
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#else
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// Fallback to using a lock
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MutexGuard m( m_lock );
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return --m_count;
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#endif
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}
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void AtomicRefCount::reset()
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{
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#if defined( _WIN32 ) && !defined( __SYMBIAN32__ )
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::InterlockedExchange( (volatile LONG*)&m_count, (volatile LONG)0 );
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#elif defined( __APPLE__ )
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OSAtomicAnd32Barrier( (uint32_t)0, (volatile uint32_t*)&m_count );
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#elif defined( HAVE_GCC_ATOMIC_BUILTINS )
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// Use the gcc intrinsic for atomic decrement if supported.
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__sync_fetch_and_and( &m_count, 0 );
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#else
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// Fallback to using a lock
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MutexGuard m( m_lock );
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m_count = 0;
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#endif
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}
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}
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}
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