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
77
78
79
|
/*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
FUNCTION
<<getchar_unlocked>>---non-thread-safe version of getchar (macro)
INDEX
getchar_unlocked
POSIX_SYNOPSIS
#include <stdio.h>
int getchar_unlocked();
DESCRIPTION
<<getchar_unlocked>> is a non-thread-safe version of <<getchar>>
declared in <<stdio.h>>. <<getchar_unlocked>> may only safely be used
within a scope protected by flockfile() (or ftrylockfile()) and
funlockfile(). These functions may safely be used in a multi-threaded
program if and only if they are called while the invoking thread owns
the ( FILE *) object, as is the case after a successful call to the
flockfile() or ftrylockfile() functions. If threads are disabled,
then <<getchar_unlocked>> is equivalent to <<getchar>>.
RETURNS
See <<getchar>>.
PORTABILITY
POSIX 1003.1 requires <<getchar_unlocked>>. <<getchar_unlocked>> may
be implemented as a macro.
Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
<<lseek>>, <<read>>, <<sbrk>>, <<write>>. */
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "%W% (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */
/*
* A subroutine version of the macro getchar_unlocked.
*/
#include <stdio.h>
#include <reent.h>
#undef getchar_unlocked
int
_getchar_unlocked_r (f)
struct _reent *f;
{
return getc_unlocked (_stdin_r (f));
}
#ifndef _REENT_ONLY
int
getchar_unlocked ()
{
/* CHECK_INIT is called (eventually) by __srefill. */
return _getchar_unlocked_r (_REENT);
}
#endif
|
