| 1 | /**
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| 2 | * Copyright (C) 2017 Fábio Bento (random-guy)
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| 3 | *
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| 4 | * This library is distributed under the MIT License. See notice at the end
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| 5 | * of this file.
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| 6 | *
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| 7 | */
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| 8 |
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| 9 | #ifndef CONDITIONALSEMAPHORE_H
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| 10 | #define CONDITIONALSEMAPHORE_H
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| 11 |
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| 12 | #include <atomic>
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| 13 | #include <stdexcept>
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| 14 |
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| 15 | /***
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| 16 | * Conditional Semaphore - Thread safe conditional semaphore. You can set the variable by using SetCondition(),
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| 17 | * and unset it by using UnsetCondition() (you can set and unset multiple times). You can get the internal boolean variable state
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| 18 | * by using ConditionIsSet().
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| 19 | * ConditionIsSet() return true when there were more calls to SetCondition() than to UnsetCondition() and
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| 20 | * false if there the calls to SetCondition() and UnsetCondition() were equal.
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| 21 | *
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| 22 | * UnsetCondition() throws an exception if it is called more than SetCondition().
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| 23 | * */
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| 24 |
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| 25 | namespace Cosemaphore{
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| 26 |
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| 27 | class ConditionalSemaphore
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| 28 | {
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| 29 | public:
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| 30 | ConditionalSemaphore();
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| 31 | void SetCondition();
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| 32 | void UnsetCondition();
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| 33 | bool ConditionIsSet();
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| 34 | private:
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| 35 | std::atomic<long long> internalCounter;
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| 36 | };
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| 37 |
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| 38 | }
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| 39 |
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| 40 | #endif // CONDITIONALSEMAPHORE_H
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| 41 |
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| 42 | /**
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| 43 | * Copyright (c) 2017
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| 44 | *
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| 45 | * Permission is hereby granted, free of charge, to any person
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| 46 | * obtaining a copy of this software and associated documentation
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| 47 | * files (the "Software"), to deal in the Software without
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| 48 | * restriction, including without limitation the rights to use,
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| 49 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 50 | * copies of the Software, and to permit persons to whom the
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| 51 | * Software is furnished to do so, subject to the following
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| 52 | * conditions:
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| 53 | *
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| 54 | * The above copyright notice and this permission notice shall be
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| 55 | * included in all copies or substantial portions of the Software.
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| 56 | *
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| 57 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 58 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 59 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 60 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 61 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 62 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 63 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 64 | * OTHER DEALINGS IN THE SOFTWARE.
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| 65 | */
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