1 /*
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are permitted
6 * provided that the above copyright notice and this paragraph are
7 * duplicated in all such forms and that any documentation,
8 * and/or other materials related to such
9 * distribution and use acknowledge that the software was developed
10 * by the University of California, Berkeley. The name of the
11 * University may not be used to endorse or promote products derived
12 * from this software without specific prior written permission.
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16 */
17
18 /*
19 FUNCTION
20 <<putchar_unlocked>>---non-thread-safe version of putchar (macro)
21
22 INDEX
23 putchar_unlocked
24
25 SYNOPSIS
26 #include <stdio.h>
27 int putchar_unlocked(int <[ch]>);
28
29 DESCRIPTION
30 <<putchar_unlocked>> is a non-thread-safe version of <<putchar>>
31 declared in <<stdio.h>>. <<putchar_unlocked>> may only safely be used
32 within a scope protected by flockfile() (or ftrylockfile()) and
33 funlockfile(). These functions may safely be used in a multi-threaded
34 program if and only if they are called while the invoking thread owns
35 the ( FILE *) object, as is the case after a successful call to the
36 flockfile() or ftrylockfile() functions. If threads are disabled,
37 then <<putchar_unlocked>> is equivalent to <<putchar>>.
38
39 RETURNS
40 See <<putchar>>.
41
42 PORTABILITY
43 POSIX 1003.1 requires <<putchar_unlocked>>. <<putchar_unlocked>> may
44 be implemented as a macro.
45
46 Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
47 <<lseek>>, <<read>>, <<sbrk>>, <<write>>. */
48
49 #if defined(LIBC_SCCS) && !defined(lint)
50 static char sccsid[] = "%W% (Berkeley) %G%";
51 #endif /* LIBC_SCCS and not lint */
52
53 /*
54 * A subroutine version of the macro putchar_unlocked.
55 */
56
57 #define _DEFAULT_SOURCE
58 #define _DEFAULT_SOURCE
59 #include <_ansi.h>
60 #include <stdio.h>
61
62 #undef putchar_unlocked
63
64 int
putchar_unlocked(int c)65 putchar_unlocked (
66 int c)
67 {
68 return putc_unlocked (c, stdout);
69 }
70
