mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
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
63 lines
2.8 KiB
C
63 lines
2.8 KiB
C
/* force-elision.h: Automatic enabling of elision for mutexes
|
|
Copyright (C) 2013-2019 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, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
/* Automatically enable elision for existing user lock kinds. */
|
|
#define FORCE_ELISION(m, s) \
|
|
if (__pthread_force_elision) \
|
|
{ \
|
|
/* See concurrency notes regarding __kind in \
|
|
struct __pthread_mutex_s in \
|
|
sysdeps/nptl/bits/thread-shared-types.h. \
|
|
\
|
|
There are the following cases for the kind of a mutex \
|
|
(The mask PTHREAD_MUTEX_ELISION_FLAGS_NP covers the flags \
|
|
PTHREAD_MUTEX_ELISION_NP and PTHREAD_MUTEX_NO_ELISION_NP where \
|
|
only one of both flags can be set): \
|
|
- both flags are not set: \
|
|
This is the first lock operation for this mutex. Enable \
|
|
elision as it is not enabled so far. \
|
|
Note: It can happen that multiple threads are calling e.g. \
|
|
pthread_mutex_lock at the same time as the first lock \
|
|
operation for this mutex. Then elision is enabled for this \
|
|
mutex by multiple threads. Storing with relaxed MO is enough \
|
|
as all threads will store the same new value for the kind of \
|
|
the mutex. But we have to ensure that we always use the \
|
|
elision path regardless if this thread has enabled elision or \
|
|
another one. \
|
|
\
|
|
- PTHREAD_MUTEX_ELISION_NP flag is set: \
|
|
Elision was already enabled for this mutex by a previous lock \
|
|
operation. See case above. Just use the elision path. \
|
|
\
|
|
- PTHREAD_MUTEX_NO_ELISION_NP flag is set: \
|
|
Elision was explicitly disabled by pthread_mutexattr_settype. \
|
|
Do not use the elision path. \
|
|
Note: The flag PTHREAD_MUTEX_NO_ELISION_NP will never be \
|
|
changed after mutex initialization. */ \
|
|
int mutex_kind = atomic_load_relaxed (&((m)->__data.__kind)); \
|
|
if ((mutex_kind & PTHREAD_MUTEX_ELISION_FLAGS_NP) == 0) \
|
|
{ \
|
|
mutex_kind |= PTHREAD_MUTEX_ELISION_NP; \
|
|
atomic_store_relaxed (&((m)->__data.__kind), mutex_kind); \
|
|
} \
|
|
if ((mutex_kind & PTHREAD_MUTEX_ELISION_NP) != 0) \
|
|
{ \
|
|
s; \
|
|
} \
|
|
}
|