blob: 55bb6fd6d01e54c77da47dc0d2b1819651164f39 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
(************************************************************************)
(* 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 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_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 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
|
