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92 lines
2.8 KiB
C++
92 lines
2.8 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_SEMAPHORE_BEASTHEADER
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#define BEAST_SEMAPHORE_BEASTHEADER
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/*============================================================================*/
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/**
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A semaphore.
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This provides a traditional semaphore synchronization primitive. There is no
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upper limit on the number of signals.
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@note There is no tryWait() or timeout facility for acquiring a resource.
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@ingroup beast_core
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*/
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class Semaphore
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{
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public:
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/** Create a semaphore with the specified number of resources.
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@param initialCount The starting number of resources.
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*/
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explicit Semaphore (int initialCount);
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~Semaphore ();
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/** Increase the number of available resources.
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@param amount The number of new resources available.
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*/
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void signal (int amount = 1);
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/** Wait for a resource.
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*/
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void wait ();
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private:
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class WaitingThread
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: public LockFreeStack <WaitingThread>::Node
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, LeakChecked <WaitingThread>
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{
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public:
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WaitingThread ();
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void wait ();
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void signal ();
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private:
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WaitableEvent m_event;
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};
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typedef SpinLock LockType;
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LockType m_mutex;
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Atomic <int> m_counter;
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LockFreeStack <WaitingThread> m_waitingThreads;
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LockFreeStack <WaitingThread> m_deleteList;
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};
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#endif
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