pthread_md.h revision 231619 
1/*-
2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org>.
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 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: head/lib/libthr/arch/arm/include/pthread_md.h 231619 2012-02-14 00:17:43Z gonzo $
27 */
28
29/*
30 * Machine-dependent thread prototypes/definitions.
31 */
32#ifndef _PTHREAD_MD_H_
33#define	_PTHREAD_MD_H_
34
35#include <sys/types.h>
36#include <machine/sysarch.h>
37#include <stddef.h>
38
39#define	CPU_SPINWAIT
40#define	DTV_OFFSET		offsetof(struct tcb, tcb_dtv)
41
42/*
43 * Variant II tcb, first two members are required by rtld.
44 */
45struct tcb {
46	void			*tcb_dtv;	/* required by rtld */
47	struct pthread		*tcb_thread;	/* our hook */
48};
49
50/*
51 * The tcb constructors.
52 */
53struct tcb	*_tcb_ctor(struct pthread *, int);
54void		_tcb_dtor(struct tcb *);
55
56/* Called from the thread to set its private data. */
57static __inline void
58_tcb_set(struct tcb *tcb)
59{
60	*((struct tcb **)ARM_TP_ADDRESS) = tcb;
61}
62
63/*
64 * Get the current tcb.
65 */
66static __inline struct tcb *
67_tcb_get(void)
68{
69	return (*((struct tcb **)ARM_TP_ADDRESS));
70}
71
72extern struct pthread *_thr_initial;
73
74static __inline struct pthread *
75_get_curthread(void)
76{
77	if (_thr_initial)
78		return (_tcb_get()->tcb_thread);
79	return (NULL);
80}
81
82#endif /* _PTHREAD_MD_H_ */
83