1  /* Copyright (C) 2003-2023 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 "pthreadP.h"
      19  #include <shlib-compat.h>
      20  
      21  int
      22  __pthread_spin_lock (pthread_spinlock_t *lock)
      23  {
      24    unsigned int __tmp;
      25  
      26    asm volatile (
      27         "1:	lwarx	%0,0,%1" MUTEX_HINT_ACQ "\n"
      28         "	cmpwi	0,%0,0\n"
      29         "	bne-	2f\n"
      30         "	stwcx.	%2,0,%1\n"
      31         "	bne-	2f\n"
      32                  __ARCH_ACQ_INSTR "\n"
      33         "	.subsection 1\n"
      34         "2:	lwzx	%0,0,%1\n"
      35         "	cmpwi	0,%0,0\n"
      36         "	bne	2b\n"
      37         "	b	1b\n"
      38         "	.previous"
      39         : "=&r" (__tmp)
      40         : "r" (lock), "r" (1)
      41         : "cr0", "memory");
      42    return 0;
      43  }
      44  versioned_symbol (libc, __pthread_spin_lock, pthread_spin_lock, GLIBC_2_34);
      45  
      46  #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_34)
      47  compat_symbol (libpthread, __pthread_spin_lock, pthread_spin_lock, GLIBC_2_2);
      48  #endif