libc_private.h revision 35124 
1/*
2 * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by John Birrell.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $Id$
33 *
34 * Private definitions for libc, libc_r and libpthread.
35 *
36 */
37
38#ifndef _LIBC_PRIVATE_H_
39#define _LIBC_PRIVATE_H_
40
41/*
42 * This global flag is non-zero when a process has created one
43 * or more threads. It is used to avoid calling locking functions
44 * when they are not required.
45 */
46extern int	__isthreaded;
47
48/*
49 * File lock contention is difficult to diagnose without knowing
50 * where locks were set. Allow a debug library to be built which
51 * records the source file and line number of each lock call.
52 */
53#ifdef	_FLOCK_DEBUG
54#define _FLOCKFILE(x)	_flockfile_debug(x, __FILE__, __LINE__)
55#else
56#define _FLOCKFILE(x)	_flockfile(x)
57#endif
58
59/*
60 * Macros for locking and unlocking FILEs. These test if the
61 * process is threaded to avoid locking when not required.
62 */
63#define	FLOCKFILE(fp)		if (__isthreaded) _FLOCKFILE(fp)
64#define	FUNLOCKFILE(fp)		if (__isthreaded) _funlockfile(fp)
65
66#endif /* _LIBC_PRIVATE_H_ */
67