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make monotimes have zero overhead if you don't use it (#13338) [backport]

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Andreas Rumpf 2020-02-06 16:12:54 +01:00 • committed by GitHub
commit e24443f1bc
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1 changed files with 6 additions and 10 deletions
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16
lib/std/monotimes.nim
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@ -51,11 +51,6 @@ when defined(macosx):
proc mach_timebase_info(info: var MachTimebaseInfoData) {.importc, proc mach_timebase_info(info: var MachTimebaseInfoData) {.importc,
header: "<mach/mach_time.h>".} header: "<mach/mach_time.h>".}
let machAbsoluteTimeFreq = block:
var freq: MachTimebaseInfoData
mach_timebase_info(freq)
freq
when defined(js): when defined(js):
proc getJsTicks: float = proc getJsTicks: float =
## Returns ticks in the unit seconds ## Returns ticks in the unit seconds
@ -88,11 +83,6 @@ elif defined(windows):
proc QueryPerformanceFrequency(res: var uint64) {. proc QueryPerformanceFrequency(res: var uint64) {.
importc: "QueryPerformanceFrequency", stdcall, dynlib: "kernel32".} importc: "QueryPerformanceFrequency", stdcall, dynlib: "kernel32".}
let queryPerformanceCounterFreq = block:
var freq: uint64
QueryPerformanceFrequency(freq)
1_000_000_000'u64 div freq
proc getMonoTime*(): MonoTime {.tags: [TimeEffect].} = proc getMonoTime*(): MonoTime {.tags: [TimeEffect].} =
## Get the current `MonoTime` timestamp. ## Get the current `MonoTime` timestamp.
## ##
@ -105,6 +95,8 @@ proc getMonoTime*(): MonoTime {.tags: [TimeEffect].} =
result = MonoTime(ticks: (ticks * 1_000_000_000).int64) result = MonoTime(ticks: (ticks * 1_000_000_000).int64)
elif defined(macosx): elif defined(macosx):
let ticks = mach_absolute_time() let ticks = mach_absolute_time()
var machAbsoluteTimeFreq: MachTimebaseInfoData
mach_timebase_info(machAbsoluteTimeFreq)
result = MonoTime(ticks: ticks * machAbsoluteTimeFreq.numer div result = MonoTime(ticks: ticks * machAbsoluteTimeFreq.numer div
machAbsoluteTimeFreq.denom) machAbsoluteTimeFreq.denom)
elif defined(posix): elif defined(posix):
@ -115,6 +107,10 @@ proc getMonoTime*(): MonoTime {.tags: [TimeEffect].} =
elif defined(windows): elif defined(windows):
var ticks: uint64 var ticks: uint64
QueryPerformanceCounter(ticks) QueryPerformanceCounter(ticks)
var freq: uint64
QueryPerformanceFrequency(freq)
let queryPerformanceCounterFreq = 1_000_000_000'u64 div freq
result = MonoTime(ticks: (ticks * queryPerformanceCounterFreq).int64) result = MonoTime(ticks: (ticks * queryPerformanceCounterFreq).int64)
proc ticks*(t: MonoTime): int64 = proc ticks*(t: MonoTime): int64 =