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83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 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 BEAST_API 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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A negative time-out value means that the method will wait indefinitely.
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@returns true if the event has been signalled, false if the timeout expires.
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*/
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bool wait (int timeOutMilliseconds = -1);
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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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bool wait (int timeOutMilliseconds);
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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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