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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
type thread_ic = in_channel
let prepare_in_channel_for_thread_friendly_io ic =
Unix.set_nonblock (Unix.descr_of_in_channel ic); ic
let safe_wait_timed_read fd time =
try Thread.wait_timed_read fd time
with Unix.Unix_error (Unix.EINTR, _, _) ->
(** On Unix, the above function may raise this exception when it is
interrupted by a signal. (It uses Unix.select internally.) *)
false
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|Unix.EINTR),_,_) ->
while not (safe_wait_timed_read fd 0.05) 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 really_read_fd_2_oc fd oc len =
let i = ref 0 in
let size = 4096 in
let s = String.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 = String.make 1 '\000' in
while s <> "\n" do
let n = thread_friendly_read_fd fd s ~off:0 ~len:1 in
if n = 0 then raise End_of_file;
if s <> "\n" then Buffer.add_string 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 = 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 desired_size = body_size + Marshal.header_size in
if desired_size <= Sys.max_string_length then begin
let msg = String.create desired_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
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
|
