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93 lines
3.2 KiB
C++
93 lines
3.2 KiB
C++
/*============================================================================*/
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/*
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VFLib: https://github.com/vinniefalco/VFLib
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Copyright (C) 2008 by Vinnie Falco <vinnie.falco@gmail.com>
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This library contains portions of other open source products covered by
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separate licenses. Please see the corresponding source files for specific
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terms.
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VFLib is provided under the terms of The MIT License (MIT):
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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*/
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/*============================================================================*/
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#ifndef BEAST_CONCURRENTOBJECT_BEASTHEADER
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#define BEAST_CONCURRENTOBJECT_BEASTHEADER
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/*============================================================================*/
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/**
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A reference counted object with overridable destroy behavior.
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This is a reference counted object compatible with
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ReferenceCountedObjectPtr. When the last reference is removed, the
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object is queued for deletion on a separate, provided thread. On
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program exit the thread will clean itself up - no other action is
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required.
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This class is useful for offloading the deletion work of "deep" objects
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shared by multiple threads: objects containing complex members, or a
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hierarchy of allocated structures. For example, a ValueTree. The problem
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of performing heavyweight memory or cleanup operations from either an
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AudioIODeviceCallback or the message thread is avoided.
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The deletion behavior can be overriden by providing a replacement
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for destroyConcurrentObject().
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@ingroup beast_concurrent
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*/
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class ConcurrentObject : Uncopyable
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{
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public:
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inline void incReferenceCount () noexcept
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{
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m_refs.addref ();
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}
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inline void decReferenceCount () noexcept
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{
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if (m_refs.release ())
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destroyConcurrentObject ();
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}
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protected:
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ConcurrentObject ();
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virtual ~ConcurrentObject ();
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/** Delete the object.
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This function is called when the reference count drops to zero. The
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default implementation performs the delete on a separate, provided thread
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that cleans up after itself on exit.
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*/
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virtual void destroyConcurrentObject ();
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protected:
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class Deleter;
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private:
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AtomicCounter m_refs;
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};
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#endif
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