1 // locks.h - Thread synchronization primitives. Alpha implementation.
3 /* Copyright (C) 2002 Free Software Foundation
5 This file is part of libgcj.
7 This software is copyrighted work licensed under the terms of the
8 Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
11 #ifndef __SYSDEP_LOCKS_H__
12 #define __SYSDEP_LOCKS_H__
14 typedef size_t obj_addr_t
; /* Integer type big enough for object */
18 compare_and_swap(volatile obj_addr_t
*addr
,
25 "1:ldq_l %0, %1\n\t" \
26 "cmpeq %0, %5, %2\n\t" \
33 : "=&r"(oldval
), "=m"(*addr
), "=&r"(result
)
34 : "r" (new_val
), "m"(*addr
), "r"(old
) : "memory");
39 release_set(volatile obj_addr_t
*addr
, obj_addr_t new_val
)
41 __asm__
__volatile__("mb" : : : "memory");
46 compare_and_swap_release(volatile obj_addr_t
*addr
,
50 return compare_and_swap(addr
, old
, new_val
);
53 // Ensure that subsequent instructions do not execute on stale
54 // data that was loaded from memory before the barrier.
58 __asm__
__volatile__("mb" : : : "memory");
61 // Ensure that prior stores to memory are completed with respect to other
66 __asm__
__volatile__("wmb" : : : "memory");