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// locks.h - Thread synchronization primitives. IA64 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;
__asm__ __volatile__("mov ar.ccv=%4 ;; cmpxchg8.acq %0=%1,%2,ar.ccv"
: "=r"(oldval), "=m"(*addr)
: "r"(new_val), "1"(*addr), "r"(old) : "memory");
return (oldval == old);
}
// The fact that *addr is volatile should cause the compiler to
// automatically generate an st8.rel.
inline static void
release_set(volatile obj_addr_t *addr, obj_addr_t new_val)
{
__asm__ __volatile__(" " : : : "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)
{
unsigned long oldval;
__asm__ __volatile__("mov ar.ccv=%4 ;; cmpxchg8.rel %0=%1,%2,ar.ccv"
: "=r"(oldval), "=m"(*addr)
: "r"(new_val), "1"(*addr), "r"(old) : "memory");
return (oldval == old);
}
#endif
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