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5a82c74822
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
256 lines
8.3 KiB
C
256 lines
8.3 KiB
C
/* futex operations for glibc-internal use. Linux version.
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Copyright (C) 2014-2019 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 FUTEX_INTERNAL_H
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#define FUTEX_INTERNAL_H
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#include <sysdeps/nptl/futex-internal.h>
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#include <errno.h>
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#include <lowlevellock-futex.h>
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#include <sysdep-cancel.h>
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/* See sysdeps/nptl/futex-internal.h for documentation; this file only
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contains Linux-specific comments.
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The Linux kernel treats provides absolute timeouts based on the
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CLOCK_REALTIME clock and relative timeouts measured against the
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CLOCK_MONOTONIC clock.
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We expect a Linux kernel version of 2.6.22 or more recent (since this
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version, EINTR is not returned on spurious wake-ups anymore). */
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/* FUTEX_SHARED is always supported by the Linux kernel. */
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static __always_inline int
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futex_supports_pshared (int pshared)
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{
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if (__glibc_likely (pshared == PTHREAD_PROCESS_PRIVATE))
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return 0;
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else if (pshared == PTHREAD_PROCESS_SHARED)
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return 0;
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else
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return EINVAL;
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}
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/* See sysdeps/nptl/futex-internal.h for details. */
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static __always_inline int
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futex_wait (unsigned int *futex_word, unsigned int expected, int private)
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{
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int err = lll_futex_timed_wait (futex_word, expected, NULL, private);
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switch (err)
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{
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case 0:
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case -EAGAIN:
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case -EINTR:
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return -err;
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case -ETIMEDOUT: /* Cannot have happened as we provided no timeout. */
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case -EFAULT: /* Must have been caused by a glibc or application bug. */
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case -EINVAL: /* Either due to wrong alignment or due to the timeout not
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being normalized. Must have been caused by a glibc or
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application bug. */
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case -ENOSYS: /* Must have been caused by a glibc bug. */
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/* No other errors are documented at this time. */
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default:
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futex_fatal_error ();
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}
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}
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/* See sysdeps/nptl/futex-internal.h for details. */
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static __always_inline int
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futex_wait_cancelable (unsigned int *futex_word, unsigned int expected,
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int private)
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{
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int oldtype;
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oldtype = __pthread_enable_asynccancel ();
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int err = lll_futex_timed_wait (futex_word, expected, NULL, private);
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__pthread_disable_asynccancel (oldtype);
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switch (err)
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{
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case 0:
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case -EAGAIN:
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case -EINTR:
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return -err;
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case -ETIMEDOUT: /* Cannot have happened as we provided no timeout. */
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case -EFAULT: /* Must have been caused by a glibc or application bug. */
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case -EINVAL: /* Either due to wrong alignment or due to the timeout not
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being normalized. Must have been caused by a glibc or
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application bug. */
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case -ENOSYS: /* Must have been caused by a glibc bug. */
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/* No other errors are documented at this time. */
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default:
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futex_fatal_error ();
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}
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}
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/* See sysdeps/nptl/futex-internal.h for details. */
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static __always_inline int
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futex_reltimed_wait (unsigned int *futex_word, unsigned int expected,
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const struct timespec *reltime, int private)
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{
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int err = lll_futex_timed_wait (futex_word, expected, reltime, private);
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switch (err)
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{
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case 0:
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case -EAGAIN:
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case -EINTR:
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case -ETIMEDOUT:
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return -err;
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case -EFAULT: /* Must have been caused by a glibc or application bug. */
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case -EINVAL: /* Either due to wrong alignment or due to the timeout not
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being normalized. Must have been caused by a glibc or
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application bug. */
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case -ENOSYS: /* Must have been caused by a glibc bug. */
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/* No other errors are documented at this time. */
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default:
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futex_fatal_error ();
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}
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}
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/* See sysdeps/nptl/futex-internal.h for details. */
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static __always_inline int
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futex_reltimed_wait_cancelable (unsigned int *futex_word,
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unsigned int expected,
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const struct timespec *reltime, int private)
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{
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int oldtype;
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oldtype = LIBC_CANCEL_ASYNC ();
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int err = lll_futex_timed_wait (futex_word, expected, reltime, private);
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LIBC_CANCEL_RESET (oldtype);
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switch (err)
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{
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case 0:
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case -EAGAIN:
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case -EINTR:
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case -ETIMEDOUT:
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return -err;
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case -EFAULT: /* Must have been caused by a glibc or application bug. */
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case -EINVAL: /* Either due to wrong alignment or due to the timeout not
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being normalized. Must have been caused by a glibc or
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application bug. */
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case -ENOSYS: /* Must have been caused by a glibc bug. */
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/* No other errors are documented at this time. */
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default:
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futex_fatal_error ();
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}
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}
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/* See sysdeps/nptl/futex-internal.h for details. */
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static __always_inline int
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futex_abstimed_supported_clockid (clockid_t clockid)
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{
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return lll_futex_supported_clockid (clockid);
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}
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/* See sysdeps/nptl/futex-internal.h for details. */
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static __always_inline int
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futex_abstimed_wait (unsigned int *futex_word, unsigned int expected,
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clockid_t clockid,
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const struct timespec *abstime, int private)
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{
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/* Work around the fact that the kernel rejects negative timeout values
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despite them being valid. */
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if (__glibc_unlikely ((abstime != NULL) && (abstime->tv_sec < 0)))
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return ETIMEDOUT;
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int err = lll_futex_clock_wait_bitset (futex_word, expected,
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clockid, abstime,
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private);
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switch (err)
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{
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case 0:
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case -EAGAIN:
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case -EINTR:
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case -ETIMEDOUT:
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return -err;
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case -EFAULT: /* Must have been caused by a glibc or application bug. */
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case -EINVAL: /* Either due to wrong alignment, unsupported
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clockid or due to the timeout not being
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normalized. Must have been caused by a glibc or
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application bug. */
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case -ENOSYS: /* Must have been caused by a glibc bug. */
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/* No other errors are documented at this time. */
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default:
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futex_fatal_error ();
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}
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}
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/* See sysdeps/nptl/futex-internal.h for details. */
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static __always_inline int
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futex_abstimed_wait_cancelable (unsigned int *futex_word,
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unsigned int expected,
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clockid_t clockid,
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const struct timespec *abstime, int private)
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{
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/* Work around the fact that the kernel rejects negative timeout values
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despite them being valid. */
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if (__glibc_unlikely ((abstime != NULL) && (abstime->tv_sec < 0)))
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return ETIMEDOUT;
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int oldtype;
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oldtype = __pthread_enable_asynccancel ();
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int err = lll_futex_clock_wait_bitset (futex_word, expected,
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clockid, abstime,
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private);
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__pthread_disable_asynccancel (oldtype);
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switch (err)
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{
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case 0:
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case -EAGAIN:
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case -EINTR:
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case -ETIMEDOUT:
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return -err;
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case -EFAULT: /* Must have been caused by a glibc or application bug. */
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case -EINVAL: /* Either due to wrong alignment or due to the timeout not
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being normalized. Must have been caused by a glibc or
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application bug. */
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case -ENOSYS: /* Must have been caused by a glibc bug. */
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/* No other errors are documented at this time. */
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default:
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futex_fatal_error ();
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}
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}
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/* See sysdeps/nptl/futex-internal.h for details. */
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static __always_inline void
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futex_wake (unsigned int *futex_word, int processes_to_wake, int private)
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{
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int res = lll_futex_wake (futex_word, processes_to_wake, private);
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/* No error. Ignore the number of woken processes. */
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if (res >= 0)
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return;
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switch (res)
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{
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case -EFAULT: /* Could have happened due to memory reuse. */
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case -EINVAL: /* Could be either due to incorrect alignment (a bug in
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glibc or in the application) or due to memory being
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reused for a PI futex. We cannot distinguish between the
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two causes, and one of them is correct use, so we do not
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act in this case. */
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return;
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case -ENOSYS: /* Must have been caused by a glibc bug. */
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/* No other errors are documented at this time. */
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default:
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futex_fatal_error ();
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}
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}
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#endif /* futex-internal.h */
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