blob: f6076d601997adf3da73499f549455dcab1b2fa2 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
// locks.h - Thread synchronization primitives. SuperH 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__
typedef size_t obj_addr_t; /* Integer type big enough for object */
/* address. */
static unsigned char __cas_lock = 0;
inline static void
__cas_start_atomic (void)
{
unsigned int val;
do
__asm__ __volatile__ ("tas.b @%1; movt %0"
: "=r" (val)
: "r" (&__cas_lock)
: "memory");
while (val == 0);
}
inline static void
__cas_end_atomic (void)
{
__asm__ __volatile__ (" " : : : "memory");
__cas_lock = 0;
}
inline static bool
compare_and_swap (volatile obj_addr_t *addr, obj_addr_t old,
obj_addr_t new_val)
{
bool ret;
__cas_start_atomic ();
if (*addr != old)
ret = false;
else
{
*addr = new_val;
ret = true;
}
__cas_end_atomic ();
return ret;
}
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)
{
return compare_and_swap (addr, old, new_val);
}
#endif /* ! __SYSDEP_LOCKS_H__ */
|
