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Diffstat (limited to 'libjava/sysdep/m68k/locks.h')
-rw-r--r-- | libjava/sysdep/m68k/locks.h | 68 |
1 files changed, 0 insertions, 68 deletions
diff --git a/libjava/sysdep/m68k/locks.h b/libjava/sysdep/m68k/locks.h deleted file mode 100644 index b51e314..0000000 --- a/libjava/sysdep/m68k/locks.h +++ /dev/null @@ -1,68 +0,0 @@ -// locks.h - Thread synchronization primitives. m68k implementation. - -/* Copyright (C) 2006, 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__ - -/* Integer type big enough for object address. */ -typedef size_t obj_addr_t __attribute__ ((aligned (4))); - -// 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. -static inline 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); -} - -// Ensure that subsequent instructions do not execute on stale -// data that was loaded from memory before the barrier. -// On m68k, the hardware ensures that reads are properly ordered. -static inline void -read_barrier(void) -{ -} - -// Ensure that prior stores to memory are completed with respect to other -// processors. -static inline void -write_barrier(void) -{ - // m68k does not reorder writes. We just need to ensure that gcc also doesn't. - __asm__ __volatile__(" " : : : "memory"); -} - -// Set *addr to new_val with release semantics, i.e. making sure -// that prior loads and stores complete before this -// assignment. -// On m68k, the hardware shouldn't reorder reads and writes, -// so we just have to convince gcc not to do it either. -static inline void -release_set(volatile obj_addr_t *addr, obj_addr_t new_val) -{ - write_barrier (); - *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. -static inline 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 |