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https://github.com/wpilibsuite/allwpilib
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f84018af5f
During shared library loading, a different libLLVM can be pulled in, causing llvm symbols from dependent libraries to resolve to that library instead of this one. This has been seen in the wild with the Mesa OpenGL implementation in JavaFX applications (see wpilibsuite/shuffleboard#361). This is clearly a very breaking change. For some level of backwards compatibility, a namespace alias from llvm to wpi is performed in the "llvm" headers. Unfortunately, forward declarations of llvm classes will still break, but compilers seem to generate clear error messages in those cases ("namespace alias 'llvm' not allowed here, assuming 'wpi'"). This change also moves all the wpiutil headers to a single "wpi" subdirectory from the previously split "llvm", "support", "tcpsockets", and "udpsockets". Shim headers will be added for backwards compatibility in a later commit.
61 lines
1.7 KiB
C++
61 lines
1.7 KiB
C++
/*----------------------------------------------------------------------------*/
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/* Copyright (c) 2008-2018 FIRST. 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 <wpi/deprecated.h>
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#include <wpi/mutex.h>
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#include "Base.h"
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namespace frc {
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typedef void (*TimerInterruptHandler)(void* param);
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void Wait(double seconds);
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WPI_DEPRECATED("Use Timer::GetFPGATimestamp() instead.")
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double GetClock();
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double GetTime();
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/**
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* Timer objects measure accumulated time in seconds.
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*
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* The timer object functions like a stopwatch. It can be started, stopped, and
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* cleared. When the timer is running its value counts up in seconds. When
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* stopped, the timer holds the current value. The implementation simply records
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* the time when started and subtracts the current time whenever the value is
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* requested.
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*/
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class Timer {
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public:
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Timer();
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virtual ~Timer() = default;
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Timer(const Timer&) = delete;
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Timer& operator=(const Timer&) = delete;
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double Get() const;
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void Reset();
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void Start();
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void Stop();
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bool HasPeriodPassed(double period);
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static double GetFPGATimestamp();
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static double GetMatchTime();
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// The time, in seconds, at which the 32-bit FPGA timestamp rolls over to 0
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static const double kRolloverTime;
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private:
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double m_startTime = 0.0;
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double m_accumulatedTime = 0.0;
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bool m_running = false;
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mutable wpi::mutex m_mutex;
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};
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} // namespace frc
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