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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2012 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
let prepare_in_channel_for_thread_friendly_io ic =
Unix.set_nonblock (Unix.descr_of_in_channel 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.EWOULDBLOCK|Unix.EAGAIN),_,_) ->
while not (Thread.wait_timed_read fd 1.0) do Thread.yield () done;
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 thread_friendly_input_value ic =
try
let fd = Unix.descr_of_in_channel ic in
let header = String.create Marshal.header_size in
really_read_fd fd header 0 Marshal.header_size;
let body_size = Marshal.data_size header 0 in
let msg = String.create (body_size + Marshal.header_size) in
String.blit header 0 msg 0 Marshal.header_size;
really_read_fd fd msg Marshal.header_size body_size;
Marshal.from_string msg 0
with Unix.Unix_error _ -> raise End_of_file
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