about summary refs log tree commit diff
path: root/linuxthreads/sysdeps/ia64/tls.h
blob: 238ea08399fe029f268f409699721b166cec0a7b (plain) (blame)
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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/* Definitions for thread-local data handling.  linuxthreads/IA-64 version.
   Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _TLS_H
#define _TLS_H

#ifndef __ASSEMBLER__

# include <pt-machine.h>
# include <stddef.h>

/* Type for the dtv.  */
typedef union dtv
{
  size_t counter;
  void *pointer;
} dtv_t;

#else /* __ASSEMBLER__ */
# include <tcb-offsets.h>
#endif /* __ASSEMBLER__ */

#ifdef HAVE_TLS_SUPPORT

/* Signal that TLS support is available.  */
# define USE_TLS        1

# ifndef __ASSEMBLER__

typedef struct
{
  dtv_t *dtv;
  void *private;
} tcbhead_t;

/* This is the size of the initial TCB.  */
#  define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)

/* Alignment requirements for the initial TCB.  */
#  define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)

/* This is the size of the TCB.  */
#  define TLS_TCB_SIZE sizeof (tcbhead_t)

/* This is the size we need before TCB.  */
#  define TLS_PRE_TCB_SIZE sizeof (struct _pthread_descr_struct)

/* Alignment requirements for the TCB.  */
#  define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct)

/* The DTV is allocated at the TP; the TCB is placed elsewhere.  */
#  define TLS_DTV_AT_TP 1

/* Install the dtv pointer.  The pointer passed is to the element with
   index -1 which contain the length.  */
#  define INSTALL_DTV(tcbp, dtvp) \
  ((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1

/* Install new dtv for current thread.  */
#  define INSTALL_NEW_DTV(DTV) \
  (((tcbhead_t *)__thread_self)->dtv = (DTV))

/* Return dtv of given thread descriptor.  */
#  define GET_DTV(tcbp) \
  (((tcbhead_t *) (tcbp))->dtv)

/* Code to initially initialize the thread pointer.  This might need
   special attention since 'errno' is not yet available and if the
   operation can cause a failure 'errno' must not be touched.  */
#  define TLS_INIT_TP(tcbp, secondcall) \
  (__thread_self = (tcbp), NULL)

/* Return the address of the dtv for the current thread.  */
#  define THREAD_DTV() \
  (((tcbhead_t *)__thread_self)->dtv)

/* Return the thread descriptor for the current thread.  */
#  undef THREAD_SELF
#  define THREAD_SELF (__thread_self - 1)

#  undef INIT_THREAD_SELF
#  define INIT_THREAD_SELF(descr, nr) \
  (__thread_self = (struct _pthread_descr_struct *)(descr) + 1)

/* Get the thread descriptor definition.  */
#  include <linuxthreads/descr.h>

# endif

#else

# ifndef __ASSEMBLER__

typedef struct
{
  void *tcb;
  dtv_t *dtv;
  void *self;
  int multiple_threads;
} tcbhead_t;

/* Get the thread descriptor definition.  */
#  include <linuxthreads/descr.h>

#  define NONTLS_INIT_TP \
  do { 									\
    static const tcbhead_t nontls_init_tp = { .multiple_threads = 0 };	\
    __thread_self = (__typeof (__thread_self)) &nontls_init_tp;		\
  } while (0)

#endif

#endif /* USE_TLS */

#endif	/* tls.h */