39 lines
1.4 KiB
OCaml
39 lines
1.4 KiB
OCaml
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(*
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* Copyright (c) 2015 Matt Gray <matthew.thomas.gray@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*)
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external time : unit -> int64 = "caml_get_wall_clock"
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let nsec_per_day = Int64.mul 86_400L 1_000_000_000L
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let ps_per_ns = 1_000L
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let now_d_ps () =
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let nsec = time () in
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let days = Int64.div nsec nsec_per_day in
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let rem_ns = Int64.rem nsec nsec_per_day in
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let rem_ps = Int64.mul rem_ns ps_per_ns in
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(Int64.to_int days, rem_ps)
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let now () = Ptime.v (now_d_ps ())
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let current_tz_offset_s () = None
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(* According to
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* https://github.com/mirage/mini-os/blob/edfd5aae6ec5ba7d0a8834a3e9dfe5e69424150a/arch/x86/time.c#L194
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* the clock period is 1 microsecond
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*)
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let period = (0, 1_000_000L)
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let period_d_ps () = Some period
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let period () = Some (Ptime.Span.v period)
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