mirror of
https://github.com/wpilibsuite/allwpilib
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d82635bbe1
Subsections are alphabetized according to lexographic ordering. Also, HAL includes were moved from headers to source files where possible. This change may cause user code which uses HAL functionality and does not include the relevant HAL header (since it may have been provided by another WPILib header) to fail to compile.
39 lines
1.1 KiB
C++
39 lines
1.1 KiB
C++
/*----------------------------------------------------------------------------*/
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/* Copyright (c) FIRST 2016. All Rights Reserved. */
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/* Open Source Software - may be modified and shared by FRC teams. The code */
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/* must be accompanied by the FIRST BSD license file in the root directory of */
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/* the project. */
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/*----------------------------------------------------------------------------*/
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#pragma once
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#include <stdint.h>
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#include <condition_variable>
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#include "HAL/cpp/priority_mutex.h"
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class Semaphore {
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public:
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explicit Semaphore(uint32_t count = 0);
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Semaphore(Semaphore&&);
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Semaphore& operator=(Semaphore&&);
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void give();
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void take();
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// @return true if semaphore was locked successfully. false if not.
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bool tryTake();
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static const int32_t kNoWait = 0;
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static const int32_t kWaitForever = -1;
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static const uint32_t kEmpty = 0;
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static const uint32_t kFull = 1;
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private:
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priority_mutex m_mutex;
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std::condition_variable_any m_condition;
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uint32_t m_count = 0;
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};
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