51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
|
// 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
|