glibc/nptl/pthread_mutex_getprioceiling.c
Paul Eggert 581c785bf3 Update copyright dates with scripts/update-copyrights
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 7061 files FOO.

I then removed trailing white space from math/tgmath.h,
support/tst-support-open-dev-null-range.c, and
sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following
obscure pre-commit check failure diagnostics from Savannah.  I don't
know why I run into these diagnostics whereas others evidently do not.

remote: *** 912-#endif
remote: *** 913:
remote: *** 914-
remote: *** error: lines with trailing whitespace found
...
remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
2022-01-01 11:40:24 -08:00

44 lines
1.6 KiB
C

/* Get current priority ceiling of pthread_mutex_t.
Copyright (C) 2006-2022 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 <errno.h>
#include <pthreadP.h>
#include <shlib-compat.h>
int
__pthread_mutex_getprioceiling (const pthread_mutex_t *mutex, int *prioceiling)
{
/* See concurrency notes regarding __kind in struct __pthread_mutex_s
in sysdeps/nptl/bits/thread-shared-types.h. */
if (__builtin_expect ((atomic_load_relaxed (&(mutex->__data.__kind))
& PTHREAD_MUTEX_PRIO_PROTECT_NP) == 0, 0))
return EINVAL;
*prioceiling = (mutex->__data.__lock & PTHREAD_MUTEX_PRIO_CEILING_MASK)
>> PTHREAD_MUTEX_PRIO_CEILING_SHIFT;
return 0;
}
versioned_symbol (libc, __pthread_mutex_getprioceiling,
pthread_mutex_getprioceiling, GLIBC_2_34);
#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_4, GLIBC_2_34)
compat_symbol (libpthread, __pthread_mutex_getprioceiling,
pthread_mutex_getprioceiling, GLIBC_2_4);
#endif