Module Mtime.Span

Monotonic time spans.

Monotonic time spans

type t = span
val zero : span

zero is a span of 0ns.

val one : span

one is a span of 1ns.

val min_span : span

min_span is zero.

val max_span : span

max_span is 264-1ns.


val equal : span -> span -> bool

equal span span' is true iff span and span' are equal.

val compare : span -> span -> int

compare span span' orders spans by increasing duration.


val add : span -> span -> span

add span span' is span + span'.

Warning. Rolls over on overflow.

val abs_diff : span -> span -> span

abs_diff span span' is the absolute difference between span and span'.


val (*) : int -> span -> span

n * dur is n times duration dur.

Warning. Does not check for overflow or that n is positive.

val ns : span

ns is a nanosecond duration, 1·10-9s.

  • since 1.4.0
val us : span

us is a microsecond duration, 1·10-6s.

  • since 1.4.0
val ms : span

ms is a millisecond duration, 1·10-3s.

  • since 1.4.0
val s : span

s is a second duration, 1s.

  • since 1.4.0
val min : span

min is a minute duration, 60s.

  • since 1.4.0
val hour : span

hour is an hour duration, 3600s.

  • since 1.4.0
val day : span

day is a day duration, 86'400s.

  • since 1.4.0
val year : span

year is a Julian year duration (365.25 days), 31'557'600s.


val to_uint64_ns : span -> int64

to_uint64_ns span is span as an unsigned 64-bit integer nanosecond span.

val of_uint64_ns : int64 -> span

of_uint64_ns u is the unsigned 64-bit integer nanosecond span u as a span.

val of_float_ns : float -> span option

of_float_ns f is the positive floating point nanosecond span f as a span. This is None if f is negative, non finite, or larger or equal than 253 (~104 days, the largest exact floating point integer).

  • since 2.0.0
val to_float_ns : span -> float

to_float_ns s is span as a nanosecond floating point span. Note that if s is larger than 253 (~104 days, the largest exact floating point integer) the result is an approximation and will not round trip with of_float_ns.

  • since 2.0.0


val pp : Stdlib.Format.formatter -> span -> unit

pp formats spans according to their magnitude using SI prefixes on seconds and accepted non-SI units. Years are counted in Julian years (365.25 SI-accepted days) as defined by the International Astronomical Union.

Rounds towards positive infinity, i.e. over approximates, no duration is formatted shorter than it is.

The output is UTF-8 encoded, it uses U+03BC for µs (10-6s).

val dump : Stdlib.Format.formatter -> t -> unit

dump ppf span formats an unspecified raw representation of span on ppf.