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/* Definitions for thread-local data handling. linuxthreads/Alpha 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
#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
{
dtv_t *dtv;
/* Reserved for the thread implementation. In the case of LinuxThreads,
this is the thread descriptor. */
void *tcb;
} tcbhead_t;
#endif
#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 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(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. */
# define TLS_INIT_TP(descr, secondcall) \
({ \
register tcbhead_t *__self = (void *)(descr); \
__self->tcb = __self; \
__builtin_set_thread_pointer(__self); \
})
/* 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. */
#undef THREAD_SELF
#define THREAD_SELF \
((pthread_descr)(((tcbhead_t *)__builtin_thread_pointer ())->tcb))
#undef INIT_THREAD_SELF
# endif /* HAVE_TLS_SUPPORT */
#endif /* __ASSEMBLER__ */
#endif /* tls.h */
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