68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
/*
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* Copyright Onix Solutions Limited [OnixS]. All rights reserved.
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*
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* This software owned by Onix Solutions Limited [OnixS] and is protected by copyright law
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* and international copyright treaties.
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*
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* Access to and use of the software is governed by the terms of the applicable OnixS Software
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* Services Agreement (the Agreement) and Customer end user license agreements granting
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* a non-assignable, non-transferable and non-exclusive license to use the software
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* for it's own data processing purposes under the terms defined in the Agreement.
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*
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* Except as otherwise granted within the terms of the Agreement, copying or reproduction of any part
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* of this source code or associated reference material to any other location for further reproduction
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* or redistribution, and any amendments to this copyright notice, are expressly prohibited.
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*
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* Any reproduction or redistribution for sale or hiring of the Software not in accordance with
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* the terms of the Agreement is a violation of copyright law.
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*/
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#pragma once
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#include <OnixS/FIXEngine/ABI.h>
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namespace OnixS {
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namespace Threading {
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/// The limits number of threads that can access the shared resource simultaneously.
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class ONIXS_FIXENGINE_API Semaphore
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{
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public:
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/// Initializes the instance with the given value of
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/// the "count". The @param count indicates the initial "count"
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/// for the semaphore. The state of the semaphore is signaled
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/// when its count is greater than zero and
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/// non-signaled when it is zero.
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Semaphore(unsigned int count = 1);
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/// Destructs the object.
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~Semaphore();
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/// Decrements the semaphore "counter" by one.
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/// If the semaphore "counter" is already zero,
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/// blocks the thread until the semaphore "count"
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/// becomes greater than zero.
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void acquire();
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/// Tries to acquire the semaphore object. If
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/// its "counter" is already zero, returns
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/// @c false. In all cases, it doesn't block
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/// the thread and quites immediately.
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bool tryAcquire();
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/// Increments the semaphore "counter" by one.
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/// If there are other threads waiting for
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/// the object, it blocks one the them.
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void release();
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private:
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// Implementation details.
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void * impl_;
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// Copying & assignment is prohibited.
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Semaphore(const Semaphore &);
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Semaphore & operator = (const Semaphore &);
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};
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}
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}
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