Subversion Repositories hf-risc

/* Copyright (C) 2005 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, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#include <errno.h>

int pthread_spin_lock(pthread_spinlock_t* lock)

{

#ifdef __riscv_atomic

  int tmp1, tmp2;

  asm volatile ("\n\

  1:lw           %0, 0(%2)\n\

    li           %1, %3\n\

    bnez         %0, 1b\n\

    amoswap.w.aq %0, %1, 0(%2)\n\

    bnez         %0, 1b"

    : "=&r"(tmp1), "=&r"(tmp2) : "r"(lock), "i"(EBUSY)

  );

  return tmp1;

#else

  return pthread_mutex_lock(lock);

#endif

}