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581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
167 lines
5.4 KiB
C
167 lines
5.4 KiB
C
/* Definition for thread-local data handling. nptl/IA-64 version.
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Copyright (C) 2003-2022 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, see
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<https://www.gnu.org/licenses/>. */
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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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# include <stdlib.h>
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# include <list.h>
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# include <dl-dtv.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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register struct pthread *__thread_self __asm__("r13");
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# define TLS_MULTIPLE_THREADS_IN_TCB 1
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#else /* __ASSEMBLER__ */
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# include <tcb-offsets.h>
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#endif
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/* Alignment requirement for the stack. */
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#define STACK_ALIGN 16
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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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/* This is the size of the initial TCB. */
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# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
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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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If there is not any room for uintptr_t stack_guard and
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uintptr_t pointer_guard in struct pthread's final padding,
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we need to put struct pthread 16 byte slower. */
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# define TLS_PRE_TCB_SIZE \
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(sizeof (struct pthread) \
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+ (PTHREAD_STRUCT_END_PADDING < 2 * sizeof (uintptr_t) \
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? ((2 * sizeof (uintptr_t) + __alignof__ (struct pthread) - 1) \
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& ~(__alignof__ (struct pthread) - 1)) \
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: 0))
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/* The DTV is allocated at the TP; the TCB is placed elsewhere. */
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# define TLS_DTV_AT_TP 1
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# define TLS_TCB_AT_TP 0
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/* Get the thread descriptor definition. */
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# include <nptl/descr.h>
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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(descr, dtvp) \
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((tcbhead_t *) (descr))->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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(((tcbhead_t *)__thread_self)->dtv = (DTV))
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/* Return dtv of given thread descriptor. */
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# define GET_DTV(descr) \
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(((tcbhead_t *) (descr))->dtv)
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#define THREAD_SELF_SYSINFO (((tcbhead_t *) __thread_self)->__private)
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#define THREAD_SYSINFO(pd) \
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(((tcbhead_t *) ((char *) (pd) + TLS_PRE_TCB_SIZE))->__private)
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#ifdef NEED_DL_SYSINFO
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# define INIT_SYSINFO THREAD_SELF_SYSINFO = (void *) GLRO(dl_sysinfo)
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# define SETUP_THREAD_SYSINFO(pd) \
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(THREAD_SYSINFO (pd) = THREAD_SELF_SYSINFO)
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# define CHECK_THREAD_SYSINFO(pd) \
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assert (THREAD_SYSINFO (pd) == THREAD_SELF_SYSINFO)
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#else
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# define INIT_SYSINFO NULL
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#endif
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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(thrdescr) \
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(__thread_self = (thrdescr), INIT_SYSINFO, NULL)
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/* Value passed to 'clone2' for initialization of the thread register. */
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# define TLS_DEFINE_INIT_TP(tp, pd) \
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void *tp = (char *) (pd) + TLS_PRE_TCB_SIZE
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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 *)__thread_self)->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 *) ((char *) __thread_self - TLS_PRE_TCB_SIZE))
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/* Magic for libthread_db to know how to do THREAD_SELF. */
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# define DB_THREAD_SELF REGISTER (64, 64, 13 * 8, -TLS_PRE_TCB_SIZE)
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# include <tcb-access.h>
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/* Set the stack guard field in TCB head. */
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#define THREAD_SET_STACK_GUARD(value) \
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(((uintptr_t *) __thread_self)[-1] = (value))
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#define THREAD_COPY_STACK_GUARD(descr) \
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(((uintptr_t *) ((char *) (descr) + TLS_PRE_TCB_SIZE))[-1] \
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= ((uintptr_t *) __thread_self)[-1])
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/* Set the pointer guard field in TCB head. */
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#define THREAD_GET_POINTER_GUARD() \
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(((uintptr_t *) __thread_self)[-2])
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#define THREAD_SET_POINTER_GUARD(value) \
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(((uintptr_t *) __thread_self)[-2] = (value))
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#define THREAD_COPY_POINTER_GUARD(descr) \
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(((uintptr_t *) ((char *) (descr) + TLS_PRE_TCB_SIZE))[-2] \
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= THREAD_GET_POINTER_GUARD ())
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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, LLL_PRIVATE); \
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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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#endif /* __ASSEMBLER__ */
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#endif /* tls.h */
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