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//+private
//+build openbsd
package sync2
import "core:c"
import "core:os"
import "core:time"
FUTEX_WAIT :: 1
FUTEX_WAKE :: 2
FUTEX_PRIVATE_FLAG :: 128
FUTEX_WAIT_PRIVATE :: (FUTEX_WAIT | FUTEX_PRIVATE_FLAG)
FUTEX_WAKE_PRIVATE :: (FUTEX_WAKE | FUTEX_PRIVATE_FLAG)
foreign import libc "system:c"
foreign libc {
@(link_name="futex")
_unix_futex :: proc "c" (f: ^Futex, op: c.int, val: u32, timeout: rawptr) -> c.int ---
}
_futex_wait :: proc(f: ^Futex, expected: u32) -> bool {
res := _unix_futex(f, FUTEX_WAIT_PRIVATE, expected, nil)
if res != -1 {
return true
}
if os.Errno(os.get_last_error()) == os.ETIMEDOUT {
return false
}
panic("futex_wait failure")
}
_futex_wait_with_timeout :: proc(f: ^Futex, expected: u32, duration: time.Duration) -> bool {
if duration <= 0 {
return false
}
timespec_t :: struct {
tv_sec: c.long,
tv_nsec: c.long,
}
res := _unix_futex(f, FUTEX_WAIT_PRIVATE, expected, ×pec_t{
tv_sec = (c.long)(duration/1e9),
tv_nsec = (c.long)(duration%1e9),
})
if res != -1 {
return true
}
if os.Errno(os.get_last_error()) == os.ETIMEDOUT {
return false
}
panic("futex_wait_with_timeout failure")
}
_futex_signal :: proc(f: ^Futex) {
res := _unix_futex(f, FUTEX_WAKE_PRIVATE, 1, nil)
if res == -1 {
panic("futex_wake_single failure")
}
}
_futex_broadcast :: proc(f: ^Futex) {
res := _unix_futex(f, FUTEX_WAKE_PRIVATE, u32(max(i32)), nil)
if res == -1 {
panic("_futex_wake_all failure")
}
}
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