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
132
133
134
135
136
137
138
139
140
|
/* Definitions for thread-local data handling. linuxthreads/s390 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;
typedef struct
{
void *tcb; /* Pointer to the TCB. Not necessary the
thread descriptor used by libpthread. */
dtv_t *dtv;
void *self; /* Pointer to the thread descriptor. */
int multiple_threads;
} tcbhead_t;
#else /* __ASSEMBLER__ */
# include <tcb-offsets.h>
#endif /* __ASSEMBLER__ */
/* TLS is always supported if the tools support it. There are no
kernel dependencies. To avoid bothering with the TLS support code
at all, use configure --without-tls.
We need USE_TLS to be consistently defined, for ldsodefs.h
conditionals. */
#ifdef HAVE_TLS_SUPPORT
/* Signal that TLS support is available. */
# define USE_TLS 1
# ifndef __ASSEMBLER__
/* Get system call information. */
# include <sysdep.h>
/* Get the thread descriptor definition. */
# include <linuxthreads/descr.h>
/* 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 (struct _pthread_descr_struct)
/* Alignment requirements for the TCB. */
# define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct)
/* The TCB can have any size and the memory following the address the
thread pointer points to is unspecified. Allocate the TCB there. */
# define TLS_TCB_AT_TP 1
/* Install the dtv pointer. The pointer passed is to the element with
index -1 which contain the length. */
# define INSTALL_DTV(descr, dtvp) \
((tcbhead_t *) (descr))->dtv = (dtvp) + 1
/* Install new dtv for current thread. */
# define INSTALL_NEW_DTV(dtv) \
(((tcbhead_t *) __builtin_thread_pointer ())->dtv = (dtv))
/* Return dtv of given thread descriptor. */
# define GET_DTV(descr) \
(((tcbhead_t *) (descr))->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.
The value of this macro is null if successful, or an error string. */
# define TLS_INIT_TP(descr, secondcall) \
({ \
void *_descr = (descr); \
tcbhead_t *head = _descr; \
\
head->tcb = _descr; \
/* For now the thread descriptor is at the same address. */ \
head->self = _descr; \
\
__builtin_set_thread_pointer (_descr); \
NULL; \
})
/* Return the address of the dtv for the current thread. */
# define THREAD_DTV() \
(((tcbhead_t *) __builtin_thread_pointer ())->dtv)
# endif /* __ASSEMBLER__ */
#else /* HAVE_TLS_SUPPORT && (FLOATING_STACKS || !IS_IN_libpthread) */
# ifndef __ASSEMBLER__
/* Get the thread descriptor definition. */
# include <linuxthreads/descr.h>
# define NONTLS_INIT_TP \
do { \
static const tcbhead_t nontls_init_tp \
= { .multiple_threads = 0 }; \
INIT_THREAD_SELF (&nontls_init_tp, 0); \
} while (0)
# endif /* __ASSEMBLER__ */
#endif /* HAVE_TLS_SUPPORT && (FLOATING_STACKS || !IS_IN_libpthread) */
#endif /* tls.h */
|
