* config/rs6000/t-spe (MULTILIB_EXCEPTIONS): Allow isel without SPE.
[official-gcc.git] / libjava / sysdep / mips / locks.h
blobc8e30cf688823e5cbe2da6894a811eed83fa188c
1 // locks.h - Thread synchronization primitives. MIPS implementation.
3 /* Copyright (C) 2003 Free Software Foundation
5 This file is part of libgcj.
7 This software is copyrighted work licensed under the terms of the
8 Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
9 details. */
11 #ifndef __SYSDEP_LOCKS_H__
12 #define __SYSDEP_LOCKS_H__
14 /* Integer type big enough for object address. */
15 typedef unsigned obj_addr_t __attribute__((__mode__(__pointer__)));
18 // Atomically replace *addr by new_val if it was initially equal to old.
19 // Return true if the comparison succeeded.
20 // Assumed to have acquire semantics, i.e. later memory operations
21 // cannot execute before the compare_and_swap finishes.
22 inline static bool
23 compare_and_swap(volatile obj_addr_t *addr,
24 obj_addr_t old,
25 obj_addr_t new_val)
27 return __sync_bool_compare_and_swap(addr, old, new_val);
30 // Set *addr to new_val with release semantics, i.e. making sure
31 // that prior loads and stores complete before this
32 // assignment.
33 inline static void
34 release_set(volatile obj_addr_t *addr, obj_addr_t new_val)
36 __sync_synchronize();
37 *(addr) = new_val;
40 // Compare_and_swap with release semantics instead of acquire semantics.
41 // On many architecture, the operation makes both guarantees, so the
42 // implementation can be the same.
43 inline static bool
44 compare_and_swap_release(volatile obj_addr_t *addr,
45 obj_addr_t old,
46 obj_addr_t new_val)
48 return __sync_bool_compare_and_swap(addr, old, new_val);
51 // Ensure that subsequent instructions do not execute on stale
52 // data that was loaded from memory before the barrier.
53 // On X86, the hardware ensures that reads are properly ordered.
54 inline static void
55 read_barrier()
57 __sync_synchronize();
60 // Ensure that prior stores to memory are completed with respect to other
61 // processors.
62 inline static void
63 write_barrier()
65 __sync_synchronize();
68 #endif // __SYSDEP_LOCKS_H__