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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
99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
/* Unlock a rwlock. Generic version.
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Copyright (C) 2000-2019 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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#include <pthread.h>
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#include <pt-internal.h>
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/* Unlock *RWLOCK, rescheduling a waiting writer thread or, if there
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are no threads waiting for a write lock, rescheduling the reader
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threads. */
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int
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__pthread_rwlock_unlock (pthread_rwlock_t *rwlock)
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{
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struct __pthread *wakeup;
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__pthread_spin_lock (&rwlock->__lock);
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assert (__pthread_spin_trylock (&rwlock->__held) == EBUSY);
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if (rwlock->__readers > 1)
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/* There are other readers. */
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{
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rwlock->__readers--;
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__pthread_spin_unlock (&rwlock->__lock);
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return 0;
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}
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if (rwlock->__readers == 1)
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/* Last reader. */
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rwlock->__readers = 0;
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/* Wake someone else up. Try the writer queue first, then the
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reader queue if that is empty. */
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if (rwlock->__writerqueue)
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{
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wakeup = rwlock->__writerqueue;
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__pthread_dequeue (wakeup);
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/* We do not unlock RWLOCK->held: we are transferring the ownership
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to the thread that we are waking up. */
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__pthread_spin_unlock (&rwlock->__lock);
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__pthread_wakeup (wakeup);
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return 0;
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}
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if (rwlock->__readerqueue)
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{
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unsigned n = 0;
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__pthread_queue_iterate (rwlock->__readerqueue, wakeup)
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n++;
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{
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struct __pthread *wakeups[n];
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unsigned i = 0;
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__pthread_dequeuing_iterate (rwlock->__readerqueue, wakeup)
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wakeups[i++] = wakeup;
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rwlock->__readers += n;
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rwlock->__readerqueue = 0;
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__pthread_spin_unlock (&rwlock->__lock);
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for (i = 0; i < n; i++)
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__pthread_wakeup (wakeups[i]);
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}
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return 0;
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}
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/* Noone is waiting. Just unlock it. */
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__pthread_spin_unlock (&rwlock->__held);
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__pthread_spin_unlock (&rwlock->__lock);
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return 0;
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}
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weak_alias (__pthread_rwlock_unlock, pthread_rwlock_unlock);
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