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clarify that time_ns is monotonic #57129

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clarify that time_ns is monotonic #57129

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8cd2da7
clarify that time_ns is monotonic
stevengj Jan 22, 2025
8517a74
tweak
stevengj Jan 22, 2025
d5074b4
tweak
stevengj Jan 22, 2025
2ecea16
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stevengj Jan 22, 2025
fe9f6fb
clarification
stevengj Jan 22, 2025
780d041
mod 2⁶⁴
stevengj Jan 22, 2025
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8 changes: 6 additions & 2 deletions base/Base_compiler.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -158,8 +158,12 @@ end
"""
time_ns() -> UInt64

Get the time in nanoseconds relative to some arbitrary time in the past. The primary use is for measuring the elapsed time
between two moments in time.
Get the time in nanoseconds relative to some machine-specific arbitrary time in the past.
The primary use is for measuring elapsed times during program execution. The return value is guaranteed to
be monotonic (mod 2⁶⁴) while the system is running, and is unaffected by clock drift or changes to local calendar time,
but it may change arbitrarily across system reboots or suspensions.

(Although the returned time is always in nanoseconds, the timing resolution is platform-dependent.)
"""
time_ns() = ccall(:jl_hrtime, UInt64, ())

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