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
|
package sync
import "core:intrinsics"
cpu_relax :: inline proc "contextless" () {
intrinsics.cpu_relax();
}
Condition_Mutex_Ptr :: union{^Mutex, ^Blocking_Mutex};
Ticket_Mutex :: struct {
ticket: u64,
serving: u64,
}
ticket_mutex_init :: proc(m: ^Ticket_Mutex) {
atomic_store(&m.ticket, 0, .Relaxed);
atomic_store(&m.serving, 0, .Relaxed);
}
ticket_mutex_lock :: inline proc(m: ^Ticket_Mutex) {
ticket := atomic_add(&m.ticket, 1, .Relaxed);
for ticket != atomic_load(&m.serving, .Acquire) {
intrinsics.cpu_relax();
}
}
ticket_mutex_unlock :: inline proc(m: ^Ticket_Mutex) {
atomic_add(&m.serving, 1, .Relaxed);
}
Benaphore :: struct {
counter: int,
sema: Semaphore,
}
benaphore_init :: proc(b: ^Benaphore) {
intrinsics.atomic_store(&b.counter, 0);
semaphore_init(&b.sema);
}
benaphore_destroy :: proc(b: ^Benaphore) {
semaphore_destroy(&b.sema);
}
benaphore_lock :: proc(b: ^Benaphore) {
if intrinsics.atomic_add_acq(&b.counter, 1) > 1 {
semaphore_wait_for(&b.sema);
}
}
benaphore_try_lock :: proc(b: ^Benaphore) -> bool {
v, _ := intrinsics.atomic_cxchg_acq(&b.counter, 1, 0);
return v == 0;
}
benaphore_unlock :: proc(b: ^Benaphore) {
if intrinsics.atomic_sub_rel(&b.counter, 1) > 0 {
semaphore_post(&b.sema);
}
}
|
