sysdeps/i386/pthread_spin_trylock.S

   1 /* Copyright (C) 2002-2024 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 <errno.h>
  20 #include <shlib-compat.h>
  21
  22 ENTRY (__pthread_spin_trylock)
  23         movl    4(%esp), %edx
  24         movl    $1, %eax
  25         xorl    %ecx, %ecx
  26         lock
  27         cmpxchgl %ecx, (%edx)
  28         movl    $EBUSY, %eax
  29 #ifdef HAVE_CMOV
  30         cmovel  %ecx, %eax
  31 #else
  32         jne     0f
  33         movl    %ecx, %eax
  34 0:
  35 #endif
  36         ret
  37 END (__pthread_spin_trylock)
  38 versioned_symbol (libc, __pthread_spin_trylock, pthread_spin_trylock,
  39                   GLIBC_2_34)
  40
  41 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_34)
  42 compat_symbol (libpthread, __pthread_spin_trylock, pthread_spin_trylock,
  43                GLIBC_2_2)
  44 #endif