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
|
#ifndef I386_ATOMIC_H
#define I386_ATOMIC_H
typedef struct _atomic_t
{
int counter;
} atomic_t;
inline atomic_t ATOMIC_INIT(volatile long &v)
{
atomic_t tmp;
tmp.counter = (int)v;
return tmp;
}
inline int atomic_inc(volatile atomic_t *ptr)
{
unsigned char ret;
asm volatile("lock incl %0\n"
"setne %1"
: "=m" (ptr->counter), "=qm" (ret)
: "m" (ptr->counter)
: "memory");
return static_cast<int>(ret);
}
inline int atomic_dec(volatile atomic_t *ptr)
{
unsigned char ret;
asm volatile("lock decl %0\n"
"setne %1"
: "=m" (ptr->counter), "=qm" (ret)
: "m" (ptr->counter)
: "memory");
return static_cast<int>(ret);
}
inline int atomic_test_and_set_int(volatile int *ptr, int expected, int newval)
{
unsigned char ret;
asm volatile("lock cmpxchgl %2,%3\n"
"sete %1\n"
: "=a" (newval), "=qm" (ret)
: "r" (newval), "m" (*ptr), "0" (expected)
: "memory");
return static_cast<int>(ret);
}
inline int atomic_test_and_set_ptr(volatile void *ptr, void *expected, void *newval)
{
return atomic_test_and_set_int(reinterpret_cast<volatile int *>(ptr),
reinterpret_cast<int>(expected),
reinterpret_cast<int>(newval));
}
#endif
|
