8f529046a9
I'm a tabs guy. I like tabs, it's an elegant way to represent indentation instead of brute-forcing it. But I have to admit that the world seems to be going towards spaces, and tooling tends not to play nice with tabs. So here we go, changing the whole repo to spaces since I'm getting tired of all the inconsistent formatting.
45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
#pragma once
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/// \file clock.h
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/// The kernel time keeping interface
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#include <stdint.h>
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class clock
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{
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public:
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/// A source is a function that returns the current
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/// value of some clock source.
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using source = uint64_t (*)(void*);
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/// Constructor.
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/// \arg rate Number of source ticks per us
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/// \arg source Function for the clock source
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/// \arg data Data to pass to the source function
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clock(uint64_t rate, source source_func, void *data);
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/// Get the current value of the clock.
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/// \returns Current value of the source, in us
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/// TODO: optimize divison by finding a multiply and
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/// shift value instead
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inline uint64_t value() const { return m_source(m_data) / m_rate; }
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/// Update the internal state via the source
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/// \returns Current value of the clock
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inline void update() { m_current = value(); }
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/// Wait in a tight loop
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/// \arg interval Time to wait, in us
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void spinwait(uint64_t us) const;
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/// Get the master clock
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static clock & get() { return *s_instance; }
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private:
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uint64_t m_current; ///< current us count
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uint64_t m_rate; ///< source ticks per us
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void *m_data;
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source m_source;
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static clock *s_instance;
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};
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