diff options
Diffstat (limited to 'gcc-4.8/libjava/sysdep/s390/locks.h')
-rw-r--r-- | gcc-4.8/libjava/sysdep/s390/locks.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/gcc-4.8/libjava/sysdep/s390/locks.h b/gcc-4.8/libjava/sysdep/s390/locks.h new file mode 100644 index 000000000..96fb43d56 --- /dev/null +++ b/gcc-4.8/libjava/sysdep/s390/locks.h @@ -0,0 +1,63 @@ +// locks.h - Thread synchronization primitives. S/390 implementation. + +/* Copyright (C) 2002-2012 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. */ + +// Atomically replace *addr by new_val if it was initially equal to old. +// Return true if the comparison succeeded. +// Assumed to have acquire semantics, i.e. later memory operations +// cannot execute before the compare_and_swap finishes. +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); +} + +// Set *addr to new_val with release semantics, i.e. making sure +// that prior loads and stores complete before this +// assignment. +inline static void +release_set(volatile obj_addr_t *addr, obj_addr_t new_val) +{ + __sync_synchronize (); + *(addr) = new_val; +} + +// Compare_and_swap with release semantics instead of acquire semantics. +// On many architecture, the operation makes both guarantees, so the +// implementation can be the same. +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); +} + +// Ensure that subsequent instructions do not execute on stale +// data that was loaded from memory before the barrier. +inline static void +read_barrier() +{ + __sync_synchronize (); +} + +// Ensure that prior stores to memory are completed with respect to other +// processors. +inline static void +write_barrier() +{ + __sync_synchronize (); +} +#endif |