2007-06-09 Ulrich Drepper <drepper@redhat.com>
[glibc.git] / nptl / sysdeps / alpha / tls.h
blob9072e2d6fbd45be0bbd3a2f67809593f0c8b5995
1 /* Definition for thread-local data handling. NPTL/Alpha version.
2 Copyright (C) 2003, 2005, 2006 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #ifndef _TLS_H
21 #define _TLS_H 1
23 # include <dl-sysdep.h>
25 #ifndef __ASSEMBLER__
26 # include <stdbool.h>
27 # include <stddef.h>
28 # include <stdint.h>
30 /* Type for the dtv. */
31 typedef union dtv
33 size_t counter;
34 struct
36 void *val;
37 bool is_static;
38 } pointer;
39 } dtv_t;
41 #else /* __ASSEMBLER__ */
42 # include <tcb-offsets.h>
43 #endif /* __ASSEMBLER__ */
46 /* We require TLS support in the tools. */
47 #ifndef HAVE_TLS_SUPPORT
48 # error "TLS support is required."
49 #endif
51 #ifndef __ASSEMBLER__
53 /* Get system call information. */
54 # include <sysdep.h>
56 /* The TP points to the start of the thread blocks. */
57 # define TLS_DTV_AT_TP 1
59 /* Get the thread descriptor definition. */
60 # include <nptl/descr.h>
62 typedef struct
64 dtv_t *dtv;
65 void *__private;
66 } tcbhead_t;
68 /* This is the size of the initial TCB. */
69 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
71 /* Alignment requirements for the initial TCB. */
72 # define TLS_INIT_TCB_ALIGN 16
74 /* This is the size of the TCB. */
75 # define TLS_TCB_SIZE sizeof (tcbhead_t)
77 /* This is the size we need before TCB. */
78 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
80 /* Alignment requirements for the TCB. */
81 # define TLS_TCB_ALIGN 16
83 /* Install the dtv pointer. The pointer passed is to the element with
84 index -1 which contain the length. */
85 # define INSTALL_DTV(tcbp, dtvp) \
86 (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
88 /* Install new dtv for current thread. */
89 # define INSTALL_NEW_DTV(dtv) \
90 (THREAD_DTV() = (dtv))
92 /* Return dtv of given thread descriptor. */
93 # define GET_DTV(tcbp) \
94 (((tcbhead_t *) (tcbp))->dtv)
96 /* Code to initially initialize the thread pointer. This might need
97 special attention since 'errno' is not yet available and if the
98 operation can cause a failure 'errno' must not be touched. */
99 # define TLS_INIT_TP(tcbp, secondcall) \
100 (__builtin_set_thread_pointer ((void *)(tcbp)), NULL)
102 /* Return the address of the dtv for the current thread. */
103 # define THREAD_DTV() \
104 (((tcbhead_t *) __builtin_thread_pointer ())->dtv)
106 /* Return the thread descriptor for the current thread. */
107 # define THREAD_SELF \
108 ((struct pthread *)__builtin_thread_pointer () - 1)
110 /* Magic for libthread_db to know how to do THREAD_SELF. */
111 # define DB_THREAD_SELF \
112 REGISTER (64, 64, 32 * 8, -sizeof (struct pthread))
114 /* Access to data in the thread descriptor is easy. */
115 #define THREAD_GETMEM(descr, member) \
116 descr->member
117 #define THREAD_GETMEM_NC(descr, member, idx) \
118 descr->member[idx]
119 #define THREAD_SETMEM(descr, member, value) \
120 descr->member = (value)
121 #define THREAD_SETMEM_NC(descr, member, idx, value) \
122 descr->member[idx] = (value)
124 /* Get and set the global scope generation counter in struct pthread. */
125 #define THREAD_GSCOPE_FLAG_UNUSED 0
126 #define THREAD_GSCOPE_FLAG_USED 1
127 #define THREAD_GSCOPE_FLAG_WAIT 2
128 #define THREAD_GSCOPE_RESET_FLAG() \
129 do \
130 { int __res \
131 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
132 THREAD_GSCOPE_FLAG_UNUSED); \
133 if (__res == THREAD_GSCOPE_FLAG_WAIT) \
134 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1); \
136 while (0)
137 #define THREAD_GSCOPE_SET_FLAG() \
138 do \
140 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
141 atomic_write_barrier (); \
143 while (0)
144 #define THREAD_GSCOPE_WAIT() \
145 GL(dl_wait_lookup_done) ()
147 #endif /* __ASSEMBLER__ */
149 #endif /* tls.h */