sysdeps/x86_64/nptl/pthread_spin_unlock.S

   1 /* Copyright (C) 2002-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <sysdep.h>
  19 #include <shlib-compat.h>
  20
  21 ENTRY(__pthread_spin_unlock)
  22         movl    $1, (%rdi)
  23         xorl    %eax, %eax
  24         retq
  25 END(__pthread_spin_unlock)
  26 versioned_symbol (libc, __pthread_spin_unlock, pthread_spin_unlock, GLIBC_2_34)
  27 /* The implementation of pthread_spin_init is identical.  */
  28 versioned_symbol (libc, __pthread_spin_unlock, pthread_spin_init, GLIBC_2_34)
  29
  30 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_34)
  31 compat_symbol (libpthread, __pthread_spin_unlock, pthread_spin_unlock,
  32                GLIBC_2_2)
  33 compat_symbol (libpthread, __pthread_spin_unlock, pthread_spin_init, GLIBC_2_2)
  34 #endif