blob: fb483ece02963911aad6ed4d7af0f2964eefce0a (
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
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
typedef struct Ptr *Ptr;
typedef struct Ref *Ref;
typedef struct Ptr
{
Ref ref;
Ptr next, prev;
} *Ptr;
typedef struct Ref
{
int *data;
Ptr head, tail;
} *Ref;
Ref ref_new(int value)
{
Ref result = malloc(sizeof(struct Ref));
result->data = malloc(sizeof(int));
*result->data = value;
result->head = result->tail = NULL;
return result;
}
Ref ref_move(Ref ref)
{
Ref result = malloc(sizeof(struct Ref));
result->data = ref->data;
result->head = ref->head;
result->tail = ref->tail;
for (Ptr p = ref->head; p != NULL; p = p->next)
{
p->ref = result;
}
free(ref);
return result;
}
void ref_add_ptr(Ref ref, Ptr ptr)
{
if (ref->head == NULL)
{
ref->head = ptr;
ref->tail = ptr;
ptr->next = ptr->prev = NULL;
return;
}
ref->tail->next = ptr;
ptr->prev = ref->tail;
ptr->next = NULL;
ref->tail = ptr;
}
void ref_remove_ptr(Ref ref, Ptr ptr)
{
for (Ptr p = ref->head; p != NULL; p = p->next)
{
if (p == ptr)
{
if (p->prev == NULL)
ref->head = p->next;
else
p->prev->next = p->next;
if (p->next == NULL)
ref->tail = p->prev;
else
p->next->prev = p->prev;
return;
}
}
}
void ref_free(Ref ref)
{
for (Ptr p = ref->head; p != NULL; p = p->next)
{
p->ref = NULL;
}
free(ref->data);
free(ref);
}
Ptr ptr_new(Ref ref)
{
Ptr result = malloc(sizeof(struct Ptr));
result->ref = ref;
ref_add_ptr(ref, result);
return result;
}
int ptr_get(Ptr ptr)
{
if (ptr->ref != NULL)
return *ptr->ref->data;
return 0;
}
void ptr_free(Ptr ptr)
{
if (ptr->ref != NULL)
ref_remove_ptr(ptr->ref, ptr);
free(ptr);
}
void test_ref()
{
Ref r1 = ref_new(123);
Ptr p1 = ptr_new(r1);
Ptr p2 = ptr_new(r1);
Ptr p3 = ptr_new(r1);
Ptr p4 = ptr_new(r1);
Ref r2 = ref_move(r1);
int i = ptr_get(p1) + ptr_get(p2) + ptr_get(p3) + ptr_get(p4);
ptr_free(p1);
ptr_free(p2);
ref_free(r2);
ptr_free(p3);
ptr_free(p4);
}
void test_reg()
{
int *r1 = malloc(sizeof(int));
*r1 = 123;
int *p1 = r1;
int *p2 = r1;
int *p3 = r1;
int *p4 = r1;
int i = *p1 + *p2 + *p3 + *p4;
int *r2 = r1;
r1 = NULL;
free(r2);
}
int main(int argc, char **argv)
{
const long N = 1000000;
clock_t start, end;
start = clock();
for (long i = 0; i < N; i++)
test_ref();
end = clock();
printf("ref: %fms\n", ((double)(end - start)) / CLOCKS_PER_SEC * 1000);
start = clock();
for (long i = 0; i < N; i++)
test_reg();
end = clock();
printf("reg: %fms\n", ((double)(end - start)) / CLOCKS_PER_SEC * 1000);
return 0;
}
|
