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//+private
package sync2
import "core:time"
when #config(ODIN_SYNC_SEMA_USE_FUTEX, true) {
_Sema :: struct {
count: Futex,
}
_sema_post :: proc(s: ^Sema, count := 1) {
atomic_add(&s.impl.count, Futex(count))
if count == 1 {
futex_signal(&s.impl.count)
} else {
futex_broadcast(&s.impl.count)
}
}
_sema_wait :: proc(s: ^Sema) {
for {
original_count := atomic_load(&s.impl.count)
for original_count == 0 {
futex_wait(&s.impl.count, u32(original_count))
original_count = s.impl.count
}
if original_count == atomic_compare_exchange_strong(&s.impl.count, original_count-1, original_count) {
return
}
}
}
_sema_wait_with_timeout :: proc(s: ^Sema, duration: time.Duration) -> bool {
if duration <= 0 {
return false
}
for {
original_count := atomic_load(&s.impl.count)
for start := time.tick_now(); original_count == 0; /**/ {
remaining := duration - time.tick_since(start)
if remaining < 0 {
return false
}
if !futex_wait_with_timeout(&s.impl.count, u32(original_count), remaining) {
return false
}
original_count = s.impl.count
}
if original_count == atomic_compare_exchange_strong(&s.impl.count, original_count-1, original_count) {
return true
}
}
}
} else {
_Sema :: struct {
wg: Wait_Group,
}
_sema_post :: proc(s: ^Sema, count := 1) {
wait_group_add(&s.impl.wg, count)
}
_sema_wait :: proc(s: ^Sema) {
wait_group_wait(&s.impl.wg)
}
_sema_wait_with_timeout :: proc(s: ^Sema, duration: time.Duration) -> bool {
return wait_group_wait_with_timeout(&s.impl.wg, duration)
}
}
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