mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 01:21:06 +00:00
2b778ceb40
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 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
63 lines
2.3 KiB
C
63 lines
2.3 KiB
C
/* Single thread optimization, Linux version.
|
|
Copyright (C) 2019-2021 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/>. */
|
|
|
|
#ifndef _SINGLE_THREAD_H
|
|
#define _SINGLE_THREAD_H
|
|
|
|
/* The default way to check if the process is single thread is by using the
|
|
pthread_t 'multiple_threads' field. However, for some architectures it is
|
|
faster to either use an extra field on TCB or global variables (the TCB
|
|
field is also used on x86 for some single-thread atomic optimizations).
|
|
|
|
The ABI might define SINGLE_THREAD_BY_GLOBAL to enable the single thread
|
|
check to use global variables instead of the pthread_t field. */
|
|
|
|
#ifdef SINGLE_THREAD_BY_GLOBAL
|
|
# if IS_IN (libc)
|
|
extern int __libc_multiple_threads;
|
|
# define SINGLE_THREAD_P \
|
|
__glibc_likely (__libc_multiple_threads == 0)
|
|
# elif IS_IN (libpthread)
|
|
extern int __pthread_multiple_threads;
|
|
# define SINGLE_THREAD_P \
|
|
__glibc_likely (__pthread_multiple_threads == 0)
|
|
# elif IS_IN (librt)
|
|
# define SINGLE_THREAD_P \
|
|
__glibc_likely (THREAD_GETMEM (THREAD_SELF, \
|
|
header.multiple_threads) == 0)
|
|
# else
|
|
/* For rtld, et cetera. */
|
|
# define SINGLE_THREAD_P (1)
|
|
# endif
|
|
#else /* SINGLE_THREAD_BY_GLOBAL */
|
|
# if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt)
|
|
# define SINGLE_THREAD_P \
|
|
__glibc_likely (THREAD_GETMEM (THREAD_SELF, \
|
|
header.multiple_threads) == 0)
|
|
# else
|
|
/* For rtld, et cetera. */
|
|
# define SINGLE_THREAD_P (1)
|
|
# endif
|
|
#endif /* SINGLE_THREAD_BY_GLOBAL */
|
|
|
|
#define RTLD_SINGLE_THREAD_P \
|
|
__glibc_likely (THREAD_GETMEM (THREAD_SELF, \
|
|
header.multiple_threads) == 0)
|
|
|
|
#endif /* _SINGLE_THREAD_H */
|