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#
#
# Nim's Runtime Library
# (c) Copyright 2012 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## Timer support for the realtime GC. Based on
## `<https://github.com/jckarter/clay/blob/master/compiler/hirestimer.cpp>`_
type
Ticks = distinct int64
Nanos = int64
when defined(windows):
proc QueryPerformanceCounter(res: var Ticks) {.
importc: "QueryPerformanceCounter", stdcall, dynlib: "kernel32".}
proc QueryPerformanceFrequency(res: var int64) {.
importc: "QueryPerformanceFrequency", stdcall, dynlib: "kernel32".}
proc getTicks(): Ticks {.inline.} =
QueryPerformanceCounter(result)
proc `-`(a, b: Ticks): Nanos =
var frequency: int64
QueryPerformanceFrequency(frequency)
var performanceCounterRate = 1e+9'f64 / float64(frequency)
result = Nanos(float64(a.int64 - b.int64) * performanceCounterRate)
elif defined(macosx) and not defined(emscripten):
type
MachTimebaseInfoData {.pure, final,
importc: "mach_timebase_info_data_t",
header: "<mach/mach_time.h>".} = object
numer, denom: int32 # note: `uint32` in sources
proc mach_absolute_time(): uint64 {.importc, header: "<mach/mach_time.h>".}
proc mach_timebase_info(info: var MachTimebaseInfoData) {.importc,
header: "<mach/mach_time.h>".}
proc getTicks(): Ticks {.inline.} =
result = Ticks(mach_absolute_time())
var timeBaseInfo: MachTimebaseInfoData
mach_timebase_info(timeBaseInfo)
proc `-`(a, b: Ticks): Nanos =
result = (a.int64 - b.int64) * timeBaseInfo.numer div timeBaseInfo.denom
elif defined(posixRealtime):
type
Clockid {.importc: "clockid_t", header: "<time.h>", final.} = object
TimeSpec {.importc: "struct timespec", header: "<time.h>",
final, pure.} = object ## struct timespec
tv_sec: int ## Seconds.
tv_nsec: int ## Nanoseconds.
var
CLOCK_REALTIME {.importc: "CLOCK_REALTIME", header: "<time.h>".}: Clockid
proc clock_gettime(clkId: Clockid, tp: var Timespec) {.
importc: "clock_gettime", header: "<time.h>".}
proc getTicks(): Ticks =
var t: Timespec
clock_gettime(CLOCK_REALTIME, t)
result = Ticks(int64(t.tv_sec) * 1000000000'i64 + int64(t.tv_nsec))
proc `-`(a, b: Ticks): Nanos {.borrow.}
else:
# fallback Posix implementation:
when not declared(Time):
when defined(linux):
type Time = clong
else:
type Time = int
type
Timeval {.importc: "struct timeval", header: "<sys/select.h>",
final, pure.} = object ## struct timeval
tv_sec: Time ## Seconds.
tv_usec: clong ## Microseconds.
proc posix_gettimeofday(tp: var Timeval, unused: pointer = nil) {.
importc: "gettimeofday", header: "<sys/time.h>".}
proc getTicks(): Ticks =
var t: Timeval
posix_gettimeofday(t)
result = Ticks(int64(t.tv_sec) * 1000_000_000'i64 +
int64(t.tv_usec) * 1000'i64)
proc `-`(a, b: Ticks): Nanos {.borrow.}
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