libjava/sysdep/alpha/locks.h

   1 // locks.h - Thread synchronization primitives. Alpha implementation.
   2
   3 /* Copyright (C) 2002  Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 #ifndef __SYSDEP_LOCKS_H__
  12 #define __SYSDEP_LOCKS_H__
  13
  14 typedef size_t obj_addr_t;      /* Integer type big enough for object   */
  15                                 /* address.                             */
  16
  17 inline static bool
  18 compare_and_swap(volatile obj_addr_t *addr,
  19                                               obj_addr_t old,
  20                                               obj_addr_t new_val)
  21 {
  22   unsigned long oldval;
  23   char result;
  24   __asm__ __volatile__(
  25       "1:ldq_l %0, %1\n\t" \
  26       "cmpeq %0, %5, %2\n\t" \
  27       "beq %2, 2f\n\t" \
  28       "mov %3, %0\n\t" \
  29       "stq_c %0, %1\n\t" \
  30       "bne %0, 2f\n\t" \
  31       "br 1b\n\t" \
  32       "2:mb"
  33               : "=&r"(oldval), "=m"(*addr), "=&r"(result)
  34               : "r" (new_val), "m"(*addr), "r"(old) : "memory");
  35   return (bool) result;
  36 }
  37
  38 inline static void
  39 release_set(volatile obj_addr_t *addr, obj_addr_t new_val)
  40 {
  41   __asm__ __volatile__("mb" : : : "memory");
  42   *(addr) = new_val;
  43 }
  44
  45 inline static bool
  46 compare_and_swap_release(volatile obj_addr_t *addr,
  47                                                      obj_addr_t old,
  48                                                      obj_addr_t new_val)
  49 {
  50   return compare_and_swap(addr, old, new_val);
  51 }
  52
  53 #endif