| // 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__ |
| |
| #include <ia64intrin.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) |
| { |
| return __sync_bool_compare_and_swap (addr, old, new_val); |
| } |
| |
| // 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) |
| { |
| register unsigned long ar_ccv __asm__("ar.ccv") = old; |
| unsigned long out; |
| __asm__ __volatile__("cmpxchg8.rel %0=%1,%2,%4" |
| : "=r"(out), "=m"(*addr) |
| : "r"(new_val), "m"(*addr), "d"(ar_ccv) : "memory"); |
| return (out == old); |
| } |
| |
| #endif |
