454 lines
14 KiB
Nim
454 lines
14 KiB
Nim
#
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# Chronos Timer
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#
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# (c) Copyright 2017 Eugene Kabanov
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# (c) Copyright 2018-Present Status Research & Development GmbH
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#
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# Licensed under either of
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# Apache License, version 2.0, (LICENSE-APACHEv2)
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# MIT license (LICENSE-MIT)
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## This module implements cross-platform system timer with
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## milliseconds resolution.
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##
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## Timer supports two types of clocks:
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## ``system`` uses the most fast OS primitive to obtain wall clock time.
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## ``mono`` uses monotonic clock time (default).
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##
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## ``system`` clock is affected by discontinuous jumps in the system time. This
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## clock is significantly faster then ``mono`` clock in most of the cases.
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##
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## ``mono`` clock is not affected by discontinuous jumps in the system time.
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## This clock is slower then ``system`` clock.
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##
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## You can specify which timer you want to use ``-d:asyncTimer=<system/mono>``.
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import stew/base10
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import "."/osdefs
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const asyncTimer* {.strdefine.} = "mono"
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{.push raises: [].}
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when defined(windows):
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when asyncTimer == "system":
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proc fastEpochTime*(): uint64 {.
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inline, deprecated: "Use Moment.now()".} =
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## Timer resolution is millisecond.
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var t: FILETIME
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getSystemTimeAsFileTime(t)
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((uint64(t.dwHighDateTime) shl 32) or uint64(t.dwLowDateTime)) div 10_000
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proc fastEpochTimeNano(): uint64 {.inline.} =
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## Timer resolution is nanosecond.
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var t: FILETIME
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getSystemTimeAsFileTime(t)
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((uint64(t.dwHighDateTime) shl 32) or uint64(t.dwLowDateTime)) * 100
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else:
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var queryFrequencyM: uint64
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var queryFrequencyN: uint64
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proc fastEpochTimeNano(): uint64 {.inline.} =
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## Procedure's resolution is nanosecond.
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var res: uint64
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queryPerformanceCounter(res)
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res * queryFrequencyN
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proc fastEpochTime*(): uint64 {.inline, deprecated: "Use Moment.now()".} =
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## Procedure's resolution is millisecond.
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var res: uint64
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queryPerformanceCounter(res)
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res div queryFrequencyM
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proc setupQueryFrequence() =
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var freq: uint64
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queryPerformanceFrequency(freq)
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if freq < 1000:
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queryFrequencyM = freq
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else:
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queryFrequencyM = freq div 1_000
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queryFrequencyN = 1_000_000_000'u64 div freq
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setupQueryFrequence()
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elif defined(macosx):
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when asyncTimer == "system":
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proc fastEpochTime*(): uint64 {.inline, deprecated: "Use Moment.now()".} =
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## Procedure's resolution is millisecond.
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var t: Timeval
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posix_gettimeofday(t)
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uint64(t.tv_sec) * 1_000 + uint64(t.tv_usec) div 1_000
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proc fastEpochTimeNano(): uint64 {.inline.} =
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## Procedure's resolution is nanosecond.
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var t: Timeval
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posix_gettimeofday(t)
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uint64(t.tv_sec) * 1_000_000_000 + uint64(t.tv_usec) * 1_000
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else:
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var queryFrequencyN: uint64
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var queryFrequencyD: uint64
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proc setupQueryFrequence() =
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var info: MachTimebaseInfo
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mach_timebase_info(info)
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queryFrequencyN = info.numer
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queryFrequencyD = info.denom
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proc fastEpochTime*(): uint64 {.inline, deprecated: "Use Moment.now()".} =
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## Procedure's resolution is millisecond.
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let res = (mach_absolute_time() * queryFrequencyN) div queryFrequencyD
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res div 1_000_000
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proc fastEpochTimeNano(): uint64 {.inline.} =
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## Procedure's resolution is nanosecond.
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(mach_absolute_time() * queryFrequencyN) div queryFrequencyD
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setupQueryFrequence()
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elif defined(posix):
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when asyncTimer == "system":
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proc fastEpochTime*(): uint64 {.inline, deprecated: "Use Moment.now()".} =
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## Procedure's resolution is millisecond.
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var t: Timespec
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discard clock_gettime(CLOCK_REALTIME, t)
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uint64(t.tv_sec) * 1_000 + (uint64(t.tv_nsec) div 1_000_000)
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proc fastEpochTimeNano(): uint64 {.inline.} =
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## Procedure's resolution is nanosecond.
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var t: Timespec
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discard clock_gettime(CLOCK_REALTIME, t)
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uint64(t.tv_sec) * 1_000_000_000'u64 + uint64(t.tv_nsec)
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else:
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proc fastEpochTime*(): uint64 {.inline, deprecated: "Use Moment.now()".} =
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## Procedure's resolution is millisecond.
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var t: Timespec
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discard clock_gettime(CLOCK_MONOTONIC, t)
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uint64(t.tv_sec) * 1_000 + (uint64(t.tv_nsec) div 1_000_000)
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proc fastEpochTimeNano(): uint64 {.inline.} =
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## Procedure's resolution is nanosecond.
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var t: Timespec
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discard clock_gettime(CLOCK_MONOTONIC, t)
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uint64(t.tv_sec) * 1_000_000_000'u64 + uint64(t.tv_nsec)
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elif defined(nimdoc):
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discard
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else:
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error("Sorry, your operation system is not yet supported!")
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type
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Moment* = object
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## A Moment in time. Its value has no direct meaning, but can be compared
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## with other Moments. Moments are captured using a monotonically
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## non-decreasing clock (by default).
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value: int64
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Duration* = object
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## A Duration is the interval between to points in time.
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value: int64
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when sizeof(int) == 4:
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type SomeIntegerI64* = SomeSignedInt|uint|uint8|uint16|uint32
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else:
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type SomeIntegerI64* = SomeSignedInt|uint8|uint16|uint32
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func `+`*(a: Duration, b: Duration): Duration {.inline.} =
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## Duration + Duration = Duration
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Duration(value: a.value + b.value)
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func `+`*(a: Duration, b: Moment): Moment {.inline.} =
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## Duration + Moment = Moment
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Moment(value: a.value + b.value)
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func `+`*(a: Moment, b: Duration): Moment {.inline.} =
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## Moment + Duration = Moment
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Moment(value: a.value + b.value)
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func `+=`*(a: var Moment, b: Duration) {.inline.} =
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## Moment += Duration
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a.value += b.value
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func `+=`*(a: var Duration, b: Duration) {.inline.} =
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## Duration += Duration
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a.value += b.value
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func `-`*(a, b: Moment): Duration {.inline.} =
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## Moment - Moment = Duration
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##
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## Note: Duration can't be negative.
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Duration(value: if a.value >= b.value: a.value - b.value else: 0'i64)
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func `-`*(a: Moment, b: Duration): Moment {.inline.} =
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## Moment - Duration = Moment
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##
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## Note: Moment can be negative
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Moment(value: a.value - b.value)
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func `-`*(a: Duration, b: Duration): Duration {.inline.} =
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## Duration - Duration = Duration
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##
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## Note: Duration can't be negative.
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Duration(value: if a.value >= b.value: a.value - b.value else: 0'i64)
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func `-=`*(a: var Duration, b: Duration) {.inline.} =
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## Duration -= Duration
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a.value = if a.value >= b.value: a.value - b.value else: 0'i64
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func `-=`*(a: var Moment, b: Duration) {.inline.} =
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## Moment -= Duration
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a.value -= b.value
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func `==`*(a, b: Duration): bool {.inline.} =
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## Returns ``true`` if ``a`` equal to ``b``.
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a.value == b.value
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func `==`*(a, b: Moment): bool {.inline.} =
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## Returns ``true`` if ``a`` equal to ``b``.
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a.value == b.value
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func `<`*(a, b: Duration): bool {.inline.} =
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## Returns ``true`` if ``a`` less then ``b``.
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a.value < b.value
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func `<`*(a, b: Moment): bool {.inline.} =
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## Returns ``true`` if ``a`` less then ``b``.
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a.value < b.value
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func `<=`*(a, b: Duration): bool {.inline.} =
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## Returns ``true`` if ``a`` less or equal ``b``.
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a.value <= b.value
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func `<=`*(a, b: Moment): bool {.inline.} =
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## Returns ``true`` if ``a`` less or equal ``b``.
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a.value <= b.value
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func `>`*(a, b: Duration): bool {.inline.} =
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## Returns ``true`` if ``a`` bigger then ``b``.
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a.value > b.value
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func `>`*(a, b: Moment): bool {.inline.} =
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## Returns ``true`` if ``a`` bigger then ``b``.
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a.value > b.value
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func `>=`*(a, b: Duration): bool {.inline.} =
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## Returns ``true`` if ``a`` bigger or equal ``b``.
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a.value >= b.value
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func `>=`*(a, b: Moment): bool {.inline.} =
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## Returns ``true`` if ``a`` bigger or equal ``b``.
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a.value >= b.value
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func `*`*(a: Duration, b: SomeIntegerI64): Duration {.inline.} =
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## Returns Duration multiplied by scalar integer.
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Duration(value: a.value * int64(b))
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func `*`*(a: SomeIntegerI64, b: Duration): Duration {.inline.} =
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## Returns Duration multiplied by scalar integer.
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Duration(value: int64(a) * b.value)
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func `div`*(a: Duration, b: SomeIntegerI64): Duration {.inline.} =
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## Returns Duration which is result of dividing a Duration by scalar integer.
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Duration(value: a.value div int64(b))
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const
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Nanosecond* = Duration(value: 1'i64)
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Microsecond* = Nanosecond * 1_000'i64
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Millisecond* = Microsecond * 1_000'i64
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Second* = Millisecond * 1_000'i64
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Minute* = Second * 60'i64
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Hour* = Minute * 60'i64
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Day* = Hour * 24'i64
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Week* = Day * 7'i64
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ZeroDuration* = Duration(value: 0'i64)
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InfiniteDuration* = Duration(value: high(int64))
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template high*(T: typedesc[Moment]): Moment =
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Moment(value: high(int64))
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template low*(T: typedesc[Moment]): Moment =
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Moment(value: 0)
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template high*(T: typedesc[Duration]): Duration =
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Duration(value: high(int64))
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template low*(T: typedesc[Duration]): Duration =
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Duration(value: 0)
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func nanoseconds*(v: SomeIntegerI64): Duration {.inline.} =
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## Initialize Duration with nanoseconds value ``v``.
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Duration(value: int64(v))
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func microseconds*(v: SomeIntegerI64): Duration {.inline.} =
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## Initialize Duration with microseconds value ``v``.
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Duration(value: int64(v) * Microsecond.value)
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func milliseconds*(v: SomeIntegerI64): Duration {.inline.} =
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## Initialize Duration with milliseconds value ``v``.
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Duration(value: int64(v) * Millisecond.value)
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func seconds*(v: SomeIntegerI64): Duration {.inline.} =
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## Initialize Duration with seconds value ``v``.
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Duration(value: int64(v) * Second.value)
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func minutes*(v: SomeIntegerI64): Duration {.inline.} =
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## Initialize Duration with minutes value ``v``.
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Duration(value: int64(v) * Minute.value)
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func hours*(v: SomeIntegerI64): Duration {.inline.} =
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## Initialize Duration with hours value ``v``.
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Duration(value: int64(v) * Hour.value)
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func days*(v: SomeIntegerI64): Duration {.inline.} =
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## Initialize Duration with days value ``v``.
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Duration(value: int64(v) * Day.value)
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func weeks*(v: SomeIntegerI64): Duration {.inline.} =
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## Initialize Duration with weeks value ``v``.
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Duration(value: int64(v) * Week.value)
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func nanoseconds*(v: Duration): int64 {.inline.} =
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## Round Duration ``v`` to nanoseconds.
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v.value
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func microseconds*(v: Duration): int64 {.inline.} =
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## Round Duration ``v`` to microseconds.
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v.value div Microsecond.value
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func milliseconds*(v: Duration): int64 {.inline.} =
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## Round Duration ``v`` to milliseconds.
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v.value div Millisecond.value
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func seconds*(v: Duration): int64 {.inline.} =
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## Round Duration ``v`` to seconds.
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v.value div Second.value
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func minutes*(v: Duration): int64 {.inline.} =
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## Round Duration ``v`` to minutes.
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v.value div Minute.value
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func hours*(v: Duration): int64 {.inline.} =
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## Round Duration ``v`` to hours.
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v.value div Hour.value
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func days*(v: Duration): int64 {.inline.} =
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## Round Duration ``v`` to days.
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v.value div Day.value
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func weeks*(v: Duration): int64 {.inline.} =
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## Round Duration ``v`` to weeks.
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v.value div Week.value
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func nanos*(v: SomeIntegerI64): Duration {.inline.} =
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nanoseconds(v)
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func micros*(v: SomeIntegerI64): Duration {.inline.} =
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microseconds(v)
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func millis*(v: SomeIntegerI64): Duration {.inline.} =
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milliseconds(v)
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func secs*(v: SomeIntegerI64): Duration {.inline.} =
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seconds(v)
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func nanos*(v: Duration): int64 {.inline.} =
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nanoseconds(v)
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func micros*(v: Duration): int64 {.inline.} =
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microseconds(v)
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func millis*(v: Duration): int64 {.inline.} =
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milliseconds(v)
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func secs*(v: Duration): int64 {.inline.} =
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seconds(v)
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template add(a: var string, b: Base10Buf[uint64]) =
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for index in 0 ..< b.len:
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a.add(char(b.data[index]))
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func `$`*(a: Duration): string {.inline.} =
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## Returns string representation of Duration ``a`` as nanoseconds value.
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var res = ""
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var v = a.value
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if v >= Week.value:
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res.add(Base10.toBytes(uint64(v div Week.value)))
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res.add('w')
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v = v mod Week.value
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if v == 0: return res
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if v >= Day.value:
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res.add(Base10.toBytes(uint64(v div Day.value)))
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res.add('d')
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v = v mod Day.value
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if v == 0: return res
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if v >= Hour.value:
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res.add(Base10.toBytes(uint64(v div Hour.value)))
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res.add('h')
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v = v mod Hour.value
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if v == 0: return res
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if v >= Minute.value:
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res.add(Base10.toBytes(uint64(v div Minute.value)))
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res.add('m')
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v = v mod Minute.value
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if v == 0: return res
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if v >= Second.value:
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res.add(Base10.toBytes(uint64(v div Second.value)))
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res.add('s')
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v = v mod Second.value
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if v == 0: return res
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if v >= Millisecond.value:
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res.add(Base10.toBytes(uint64(v div Millisecond.value)))
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res.add('m')
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res.add('s')
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v = v mod Millisecond.value
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if v == 0: return res
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if v >= Microsecond.value:
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res.add(Base10.toBytes(uint64(v div Microsecond.value)))
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res.add('u')
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res.add('s')
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v = v mod Microsecond.value
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if v == 0: return res
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res.add(Base10.toBytes(uint64(v div Nanosecond.value)))
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res.add('n')
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res.add('s')
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res
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func `$`*(a: Moment): string {.inline.} =
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## Returns string representation of Moment ``a`` as nanoseconds value.
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var res = ""
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res.add(Base10.toBytes(uint64(a.value)))
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res.add('n')
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res.add('s')
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res
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func isZero*(a: Duration): bool {.inline.} =
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## Returns ``true`` if Duration ``a`` is ``0``.
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a.value == 0
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func isInfinite*(a: Duration): bool {.inline.} =
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## Returns ``true`` if Duration ``a`` is infinite.
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a.value == InfiniteDuration.value
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proc now*(t: typedesc[Moment]): Moment {.inline.} =
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## Returns current moment in time as Moment.
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Moment(value: int64(fastEpochTimeNano()))
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func init*(t: typedesc[Moment], value: int64, precision: Duration): Moment =
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## Initialize Moment with absolute time value ``value`` with precision
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## ``precision``.
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Moment(value: value * precision.value)
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func epochSeconds*(moment: Moment): int64 =
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moment.value div Second.value
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func epochNanoSeconds*(moment: Moment): int64 =
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moment.value
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proc fromNow*(t: typedesc[Moment], a: Duration): Moment {.inline.} =
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## Returns moment in time which is equal to current moment + Duration.
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Moment.now() + a
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