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150 lines
4.3 KiB
C
150 lines
4.3 KiB
C
/* Definition for thread-local data handling. NPTL/Alpha version.
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Copyright (C) 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _TLS_H
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#define _TLS_H 1
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# include <dl-sysdep.h>
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#ifndef __ASSEMBLER__
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# include <stdbool.h>
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# include <stddef.h>
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# include <stdint.h>
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/* Type for the dtv. */
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typedef union dtv
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{
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size_t counter;
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struct
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{
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void *val;
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bool is_static;
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} pointer;
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} dtv_t;
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#else /* __ASSEMBLER__ */
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# include <tcb-offsets.h>
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#endif /* __ASSEMBLER__ */
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/* We require TLS support in the tools. */
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#ifndef HAVE_TLS_SUPPORT
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# error "TLS support is required."
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#endif
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#ifndef __ASSEMBLER__
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/* Get system call information. */
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# include <sysdep.h>
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/* The TP points to the start of the thread blocks. */
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# define TLS_DTV_AT_TP 1
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/* Get the thread descriptor definition. */
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# include <nptl/descr.h>
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typedef struct
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{
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dtv_t *dtv;
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void *__private;
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} tcbhead_t;
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/* This is the size of the initial TCB. */
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# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
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/* Alignment requirements for the initial TCB. */
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# define TLS_INIT_TCB_ALIGN 16
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/* This is the size of the TCB. */
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# define TLS_TCB_SIZE sizeof (tcbhead_t)
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/* This is the size we need before TCB. */
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# define TLS_PRE_TCB_SIZE sizeof (struct pthread)
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/* Alignment requirements for the TCB. */
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# define TLS_TCB_ALIGN 16
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/* Install the dtv pointer. The pointer passed is to the element with
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index -1 which contain the length. */
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# define INSTALL_DTV(tcbp, dtvp) \
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(((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
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/* Install new dtv for current thread. */
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# define INSTALL_NEW_DTV(dtv) \
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(THREAD_DTV() = (dtv))
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/* Return dtv of given thread descriptor. */
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# define GET_DTV(tcbp) \
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(((tcbhead_t *) (tcbp))->dtv)
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/* Code to initially initialize the thread pointer. This might need
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special attention since 'errno' is not yet available and if the
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operation can cause a failure 'errno' must not be touched. */
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# define TLS_INIT_TP(tcbp, secondcall) \
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(__builtin_set_thread_pointer ((void *)(tcbp)), NULL)
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/* Return the address of the dtv for the current thread. */
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# define THREAD_DTV() \
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(((tcbhead_t *) __builtin_thread_pointer ())->dtv)
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/* Return the thread descriptor for the current thread. */
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# define THREAD_SELF \
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((struct pthread *)__builtin_thread_pointer () - 1)
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/* Magic for libthread_db to know how to do THREAD_SELF. */
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# define DB_THREAD_SELF \
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REGISTER (64, 64, 32 * 8, -sizeof (struct pthread))
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/* Access to data in the thread descriptor is easy. */
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#define THREAD_GETMEM(descr, member) \
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descr->member
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#define THREAD_GETMEM_NC(descr, member, idx) \
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descr->member[idx]
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#define THREAD_SETMEM(descr, member, value) \
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descr->member = (value)
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#define THREAD_SETMEM_NC(descr, member, idx, value) \
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descr->member[idx] = (value)
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/* Get and set the global scope generation counter in struct pthread. */
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#define THREAD_GSCOPE_FLAG_UNUSED 0
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#define THREAD_GSCOPE_FLAG_USED 1
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#define THREAD_GSCOPE_FLAG_WAIT 2
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#define THREAD_GSCOPE_RESET_FLAG() \
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do \
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{ int __res \
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= atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
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THREAD_GSCOPE_FLAG_UNUSED); \
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if (__res == THREAD_GSCOPE_FLAG_WAIT) \
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lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1); \
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} \
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while (0)
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#define THREAD_GSCOPE_SET_FLAG() \
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do \
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{ \
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THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
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atomic_write_barrier (); \
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} \
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while (0)
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#define THREAD_GSCOPE_WAIT() \
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GL(dl_wait_lookup_done) ()
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#endif /* __ASSEMBLER__ */
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#endif /* tls.h */
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