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97 lines
2.9 KiB
C++
97 lines
2.9 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_ATOMICCOUNTER_BEASTHEADER
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#define BEAST_ATOMICCOUNTER_BEASTHEADER
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/*============================================================================*/
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/**
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A thread safe usage counter.
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This provides a simplified interface to an atomic integer suitable for
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measuring reference or usage counts. The counter is signaled when the
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count is non zero.
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@ingroup beast_core
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*/
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class AtomicCounter
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{
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public:
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/** Create a new counter.
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@param initialValue An optional starting usage count (default is 0).
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*/
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AtomicCounter (int initialValue = 0) noexcept
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:
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m_value (initialValue)
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{
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}
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/** Increment the usage count.
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@return `true` if the counter became signaled.
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*/
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inline bool addref () noexcept
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{
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return (++m_value) == 1;
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}
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/** Decrements the usage count.
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@return `true` if the counter became non-signaled.
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*/
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inline bool release () noexcept
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{
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// Unfortunately, AllocatorWithoutTLS breaks this assert
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//bassert (isSignaled ());
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return (--m_value) == 0;
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}
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/** Determine if the counter is signaled.
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Note that another thread can cause the counter to become reset after
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this function returns true.
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@return `true` if the counter was signaled.
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*/
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inline bool isSignaled () const noexcept
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{
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return m_value.get () > 0;
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}
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private:
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Atomic <int> m_value;
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};
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#endif
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