mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-19 19:40:06 +00:00
c2afe83352
[USE_TLS && HAVE___THREAD]: Just include the sysdeps/generic file, which does the right thing when __thread support is available. * descr.h (struct _pthread_descr_struct) [USE_TLS && HAVE___THREAD]: Omit `p_libc_specific', `p_errnop', `p_errno', `p_h_errnop', `p_h_errno', `p_resp', and `p_res' members. * pthread.c (__pthread_initialize_minimal) [USE_TLS && HAVE___THREAD]: Don't initialize `p_errnop' and `p_h_errnop' members. (__pthread_reset_main_thread): Likewise. (__pthread_initialize_manager): Likewise. * manager.c (__pthread_manager, pthread_handle_create): Likewise. * pthread.c (pthread_initialize) [USE_TLS && HAVE___THREAD]: Don't initialize `p_resp' member. (__pthread_reset_main_thread): Likewise. * manager.c (pthread_handle_create): Likewise. * specific.c (libc_internal_tsd_set, libc_internal_tsd_get): Conditionalize these on [!(USE_TLS && HAVE___THREAD)]. * errno.c [USE_TLS && HAVE___THREAD] (__h_errno_location, __res_state): Don't define these at all. * sysdeps/i386/tls.h (INSTALL_DTV): Add parens around arguments! (INSTALL_NEW_DTV, GET_DTV): Likewise. * sysdeps/sh/tls.h (INSTALL_DTV, INSTALL_NEW_DTV, GET_DTV): Likewise. * weaks.c: Don't include <errno.h> here. 2002-08-01 Roland McGrath <roland@redhat.com> * sysdeps/i386/tls.h (TLS_DO_MODIFY_LDT): New macro, broken out of TLS_INIT_TP. (TLS_DO_SET_THREAD_AREA): New macro, uses thread_set_area syscall. (TLS_SETUP_GS_SEGMENT): New macro, try one or the other or both. (TLS_INIT_TP): Use that.
112 lines
3.4 KiB
C
112 lines
3.4 KiB
C
/* Definition for thread-local data handling. linuxthreads/SH version.
|
|
Copyright (C) 2002 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
|
|
|
|
#include <stddef.h>
|
|
|
|
#include <pt-machine.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. */
|
|
} tcbhead_t;
|
|
|
|
|
|
/* We can support TLS only if the floating-stack support is available. */
|
|
#if defined FLOATING_STACKS && defined HAVE_TLS_SUPPORT
|
|
|
|
/* Get system call information. */
|
|
# include <sysdep.h>
|
|
|
|
/* Signal that TLS support is available. */
|
|
# define USE_TLS 1
|
|
|
|
|
|
/* 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 TLS blocks start right after the TCB. */
|
|
# 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(descr, dtvp) \
|
|
((tcbhead_t *) (descr))->dtv = dtvp + 1
|
|
|
|
/* Install new dtv for current thread. */
|
|
# define INSTALL_NEW_DTV(dtv) \
|
|
({ struct _pthread_descr_struct *__descr; \
|
|
THREAD_SETMEM (__descr, p_header.data.dtvp, (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. */
|
|
# define TLS_INIT_TP(descr) \
|
|
do { \
|
|
void *_descr = (descr); \
|
|
int result; \
|
|
tcbhead_t *head = _descr; \
|
|
\
|
|
head->tcb = _descr; \
|
|
/* For now the thread descriptor is at the same address. */ \
|
|
head->self = _descr; \
|
|
\
|
|
asm ("ldc %0,gbr" : : "r" (_descr)); \
|
|
} while (0)
|
|
|
|
|
|
/* Return the address of the dtv for the current thread. */
|
|
# define THREAD_DTV() \
|
|
({ struct _pthread_descr_struct *__descr; \
|
|
THREAD_GETMEM (__descr, p_header.data.dtvp); })
|
|
|
|
#endif /* FLOATING_STACKS && HAVE_TLS_SUPPORT */
|
|
|
|
#endif /* tls.h */
|