old-autovect-branch/libjava/sysdep/ia64/locks.h

   1 // locks.h - Thread synchronization primitives. IA64 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 #include <ia64intrin.h>
  15
  16 typedef size_t obj_addr_t;      /* Integer type big enough for object   */
  17                                 /* address.                             */
  18
  19 inline static bool
  20 compare_and_swap(volatile obj_addr_t *addr,
  21                                               obj_addr_t old,
  22                                               obj_addr_t new_val)
  23 {
  24   return __sync_bool_compare_and_swap (addr, old, new_val);
  25 }
  26
  27 // The fact that *addr is volatile should cause the compiler to
  28 // automatically generate an st8.rel.
  29 inline static void
  30 release_set(volatile obj_addr_t *addr, obj_addr_t new_val)
  31 {
  32   __asm__ __volatile__("" : : : "memory");
  33   *(addr) = new_val;
  34 }
  35
  36 inline static bool
  37 compare_and_swap_release(volatile obj_addr_t *addr,
  38                                                      obj_addr_t old,
  39                                                      obj_addr_t new_val)
  40 {
  41   register unsigned long ar_ccv __asm__("ar.ccv") = old;
  42   unsigned long out;
  43   __asm__ __volatile__("cmpxchg8.rel %0=%1,%2,%4"
  44               : "=r"(out), "=m"(*addr)
  45               : "r"(new_val), "m"(*addr), "d"(ar_ccv) : "memory");
  46   return (out == old);
  47 }
  48
  49 #endif