Quellcode-Bibliothek

^© Kompilation durch diese Firma

[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]

Datei: cThread.ml Sprache: SML

Original von: Coq^©

(************************************************************************)
(*         *   The Coq Proof Assistant / The Coq Development Team       *)
(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
(* <O___,, *       (see CREDITS file for the list of authors)           *)
(*   \VV/  **************************************************************)
(*    //   *    This file is distributed under the terms of the         *)
(*         *     GNU Lesser General Public License Version 2.1          *)
(*         *     (see LICENSE file for the text of the license)         *)
(************************************************************************)

type thread_ic = in_channel

let prepare_in_channel_for_thread_friendly_io ic = ic

let thread_friendly_read_fd fd s ~off ~len =
  let rec loop () =
    try Unix.read fd s off len
    with Unix.Unix_error(Unix.EINTR,_,_) -> loop ()
  in
    loop ()

let thread_friendly_read ic s ~off ~len =
  try
    let fd = Unix.descr_of_in_channel ic in
    thread_friendly_read_fd fd s ~off ~len
  with Unix.Unix_error _ -> 0

let really_read_fd fd s off len =
  let i = ref 0 in
  while !i < len do
    let off = off + !i in
    let len = len - !i in
    let r = thread_friendly_read_fd fd s ~off ~len in
    if r = 0 then raise End_of_file;
    i := !i + r
  done

let really_read_fd_2_oc fd oc len =
  let i = ref 0 in
  let size = 4096 in
  let s = Bytes.create size in
  while !i < len do
    let len = len - !i in
    let r = thread_friendly_read_fd fd s ~off:0 ~len:(min len size) in
    if r = 0 then raise End_of_file;
    i := !i + r;
    output oc s 0 r;
  done

let thread_friendly_really_read ic s ~off ~len =
  try
    let fd = Unix.descr_of_in_channel ic in
    really_read_fd fd s off len
  with Unix.Unix_error _ -> raise End_of_file

let thread_friendly_really_read_line ic =
  try
    let fd = Unix.descr_of_in_channel ic in
    let b = Buffer.create 1024 in
    let s = Bytes.make 1 '\000' in
    let endl = Bytes.of_string "\n" in
    (* Bytes.equal is in 4.03.0 *)
    while Bytes.compare s endl <> 0 do
      let n = thread_friendly_read_fd fd s ~off:0 ~len:1 in
      if n = 0 then raise End_of_file;
      if Bytes.compare s endl <> 0 then Buffer.add_bytes b s;
    done;
    Buffer.contents b
  with Unix.Unix_error _ -> raise End_of_file

let thread_friendly_input_value ic =
  try
    let fd = Unix.descr_of_in_channel ic in
    let header = Bytes.create Marshal.header_size in
    really_read_fd fd header 0 Marshal.header_size;
    let body_size = Marshal.data_size header 0 in
    let desired_size = body_size + Marshal.header_size in
    if desired_size <= Sys.max_string_length then begin
      let msg = Bytes.create desired_size in
      Bytes.blit header 0 msg 0 Marshal.header_size;
      really_read_fd fd msg Marshal.header_size body_size;
      Marshal.from_bytes msg 0
    end else begin
      (* Workaround for 32 bit systems and data > 16M *)
      let name, oc =
        Filename.open_temp_file ~mode:[Open_binary] "coq" "marshal" in
      try
        output oc header 0 Marshal.header_size;
        really_read_fd_2_oc fd oc body_size;
        close_out oc;
        let ic = open_in_bin name in
        let data = Marshal.from_channel ic in
        close_in ic;
        Sys.remove name;
        data
      with e -> Sys.remove name; raise e
    end
  with Unix.Unix_error _ | Sys_error _ -> raise End_of_file

(* On the ocaml runtime used in some opam-for-windows version the
* [Thread.sigmask] API raises Invalid_argument "not implemented",
* hence we protect the call and turn the exception into a no-op *)
let mask_sigalrm f x =
  begin try ignore(Thread.sigmask Unix.SIG_BLOCK [Sys.sigalrm])
  with Invalid_argument _ -> () end;
  f x

let create f x =
  Thread.create (mask_sigalrm f) x

¤ Dauer der Verarbeitung: 0.1 Sekunden (vorverarbeitet) ¤

Download des Quellennavigators
Download des sprechenden Kalenders
in der Quellcodebibliothek suchen

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.