mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 09:30:06 +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
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
/* Try to acquire a rwlock for writing. Generic version.
|
|
Copyright (C) 2002-2021 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/>. */
|
|
|
|
#include <pthread.h>
|
|
#include <assert.h>
|
|
|
|
#include <pt-internal.h>
|
|
|
|
/* Try to acquire RWLOCK for writing. */
|
|
int
|
|
pthread_rwlock_trywrlock (struct __pthread_rwlock *rwlock)
|
|
{
|
|
__pthread_spin_wait (&rwlock->__lock);
|
|
if (__pthread_spin_trylock (&rwlock->__held) == 0)
|
|
/* Successfully acquired the lock. */
|
|
{
|
|
assert (rwlock->__readerqueue == 0);
|
|
assert (rwlock->__writerqueue == 0);
|
|
assert (rwlock->__readers == 0);
|
|
|
|
__pthread_spin_unlock (&rwlock->__lock);
|
|
return 0;
|
|
}
|
|
|
|
/* The lock is busy. */
|
|
|
|
__pthread_spin_unlock (&rwlock->__lock);
|
|
|
|
return EBUSY;
|
|
}
|