diff options
Diffstat (limited to 'libjava/java/lang/natObject.cc')
| -rw-r--r-- | libjava/java/lang/natObject.cc | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/libjava/java/lang/natObject.cc b/libjava/java/lang/natObject.cc index 956b944..adb487a 100644 --- a/libjava/java/lang/natObject.cc +++ b/libjava/java/lang/natObject.cc @@ -391,6 +391,44 @@ typedef size_t obj_addr_t; /* Integer type big enough for object */ } #endif +#if defined(__GNUC__) && defined(__alpha__) + inline static bool + compare_and_swap(volatile obj_addr_t *addr, + obj_addr_t old, + obj_addr_t new_val) + { + unsigned long oldval; + char result; + __asm__ __volatile__( + "1:ldq_l %0, %1\n\t" \ + "cmpeq %0, %5, %2\n\t" \ + "beq %2, 2f\n\t" \ + "mov %3, %0\n\t" \ + "stq_c %0, %1\n\t" \ + "bne %0, 2f\n\t" \ + "br 1b\n\t" \ + "2:mb" + : "=&r"(oldval), "=m"(*addr), "=&r"(result) + : "r" (new_val), "m"(*addr), "r"(old) : "memory"); + return (bool) result; + } + + inline static void + release_set(volatile obj_addr_t *addr, obj_addr_t new_val) + { + __asm__ __volatile__("mb" : : : "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) + { + return compare_and_swap(addr, old, new_val); + } +#endif + // Try to determine whether we are on a multiprocessor, i.e. whether // spinning may be profitable. // This should really use a suitable autoconf macro. |