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glibc/ports/sysdeps/alpha/nptl/tls.h
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/* Definition for thread-local data handling. NPTL/Alpha version. | |
Copyright (C) 2003, 2005, 2006, 2007, 2012 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, see | |
<http://www.gnu.org/licenses/>. */ | |
#ifndef _TLS_H | |
#define _TLS_H 1 | |
# include <dl-sysdep.h> | |
#ifndef __ASSEMBLER__ | |
# include <stdbool.h> | |
# include <stddef.h> | |
# include <stdint.h> | |
/* Type for the dtv. */ | |
typedef union dtv | |
{ | |
size_t counter; | |
struct | |
{ | |
void *val; | |
bool is_static; | |
} pointer; | |
} dtv_t; | |
/* Get system call information. */ | |
# include <sysdep.h> | |
/* The TP points to the start of the thread blocks. */ | |
# define TLS_DTV_AT_TP 1 | |
/* Get the thread descriptor definition. */ | |
# include <nptl/descr.h> | |
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 16 | |
/* 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) | |
/* Alignment requirements for the TCB. */ | |
# define TLS_TCB_ALIGN 16 | |
/* 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) \ | |
(THREAD_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) \ | |
(__builtin_set_thread_pointer ((void *)(tcbp)), NULL) | |
/* Return the address of the dtv for the current thread. */ | |
# define THREAD_DTV() \ | |
(((tcbhead_t *) __builtin_thread_pointer ())->dtv) | |
/* Return the thread descriptor for the current thread. */ | |
# define THREAD_SELF \ | |
((struct pthread *)__builtin_thread_pointer () - 1) | |
/* Magic for libthread_db to know how to do THREAD_SELF. */ | |
# define DB_THREAD_SELF \ | |
REGISTER (64, 64, 32 * 8, -sizeof (struct pthread)) | |
/* Access to data in the thread descriptor is easy. */ | |
#define THREAD_GETMEM(descr, member) \ | |
descr->member | |
#define THREAD_GETMEM_NC(descr, member, idx) \ | |
descr->member[idx] | |
#define THREAD_SETMEM(descr, member, value) \ | |
descr->member = (value) | |
#define THREAD_SETMEM_NC(descr, member, idx, value) \ | |
descr->member[idx] = (value) | |
/* Get and set the global scope generation counter in struct pthread. */ | |
#define THREAD_GSCOPE_FLAG_UNUSED 0 | |
#define THREAD_GSCOPE_FLAG_USED 1 | |
#define THREAD_GSCOPE_FLAG_WAIT 2 | |
#define THREAD_GSCOPE_RESET_FLAG() \ | |
do \ | |
{ int __res \ | |
= atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ | |
THREAD_GSCOPE_FLAG_UNUSED); \ | |
if (__res == THREAD_GSCOPE_FLAG_WAIT) \ | |
lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ | |
} \ | |
while (0) | |
#define THREAD_GSCOPE_SET_FLAG() \ | |
do \ | |
{ \ | |
THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ | |
atomic_write_barrier (); \ | |
} \ | |
while (0) | |
#define THREAD_GSCOPE_WAIT() \ | |
GL(dl_wait_lookup_done) () | |
#else /* __ASSEMBLER__ */ | |
# include <tcb-offsets.h> | |
#endif /* __ASSEMBLER__ */ | |
#endif /* tls.h */ |