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// locks.h - Thread synchronization primitives. Alpha implementation.

/* Copyright (C) 2002  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the

Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for

details.  */

#ifndef __SYSDEP_LOCKS_H__

#define __SYSDEP_LOCKS_H__

typedef size_t obj_addr_t;      /* Integer type big enough for object   */

                                /* address.                             */

inline static bool

compare_and_swap(volatile obj_addr_t *addr,

                                              obj_addr_t old,

                                              obj_addr_t new_val)

{

  unsigned long oldval;

  char result;

  __asm__ __volatile__(

      "1:ldq_l %0, %1\n\t" \

      "cmpeq %0, %5, %2\n\t" \

      "beq %2, 2f\n\t" \

      "mov %3, %0\n\t" \

      "stq_c %0, %1\n\t" \

      "bne %0, 2f\n\t" \

      "br 1b\n\t" \

      "2:mb"

              : "=&r"(oldval), "=m"(*addr), "=&r"(result)

              : "r" (new_val), "m"(*addr), "r"(old) : "memory");

  return (bool) result;

}

inline static void

release_set(volatile obj_addr_t *addr, obj_addr_t new_val)

{

  __asm__ __volatile__("mb" : : : "memory");

  *(addr) = new_val;

}

inline static bool

compare_and_swap_release(volatile obj_addr_t *addr,

                                                     obj_addr_t old,

                                                     obj_addr_t new_val)

{

  return compare_and_swap(addr, old, new_val);

}

#endif