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package sync
import "intrinsics"
import "core:runtime"
cpu_relax :: #force_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 :: #force_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 :: #force_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);
}
}
Recursive_Benaphore :: struct {
counter: int,
owner: int,
recursion: int,
sema: Semaphore,
}
recursive_benaphore_init :: proc(b: ^Recursive_Benaphore) {
intrinsics.atomic_store(&b.counter, 0);
semaphore_init(&b.sema);
}
recursive_benaphore_destroy :: proc(b: ^Recursive_Benaphore) {
semaphore_destroy(&b.sema);
}
recursive_benaphore_lock :: proc(b: ^Recursive_Benaphore) {
tid := runtime.current_thread_id();
if intrinsics.atomic_add_acq(&b.counter, 1) > 1 {
if tid != b.owner {
semaphore_wait_for(&b.sema);
}
}
// inside the lock
b.owner = tid;
b.recursion += 1;
}
recursive_benaphore_try_lock :: proc(b: ^Recursive_Benaphore) -> bool {
tid := runtime.current_thread_id();
if b.owner == tid {
intrinsics.atomic_add_acq(&b.counter, 1);
} else {
v, _ := intrinsics.atomic_cxchg_acq(&b.counter, 1, 0);
if v != 0 {
return false;
}
// inside the lock
b.owner = tid;
}
b.recursion += 1;
return true;
}
recursive_benaphore_unlock :: proc(b: ^Recursive_Benaphore) {
tid := runtime.current_thread_id();
assert(tid == b.owner);
b.recursion -= 1;
recursion := b.recursion;
if recursion == 0 {
b.owner = 0;
}
if intrinsics.atomic_sub_rel(&b.counter, 1) > 0 {
if recursion == 0 {
semaphore_post(&b.sema);
}
}
// outside the lock
}
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