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#+private
#+build windows
package sync
import "core:time"
foreign import Synchronization "system:Synchronization.lib"
@(default_calling_convention="system")
foreign Synchronization {
WakeByAddressSingle :: proc(Address: rawptr) ---
WakeByAddressAll :: proc(Address: rawptr) ---
}
foreign import Ntdll "system:Ntdll.lib"
@(default_calling_convention="system")
foreign Ntdll {
RtlWaitOnAddress :: proc(Address: rawptr, CompareAddress: rawptr, AddressSize: uint, Timeout: ^i64) -> i32 ---
RtlNtStatusToDosError :: proc(status: i32) -> u32 ---
SetLastError :: proc(err: u32) ---
}
/*
NOTE(bill, 2022-08-17)
WaitOnAddress is implemented on top of RtlWaitOnAddress
BUT requires taking the return value of it and if it is non-zero
converting that status to a DOS error and then SetLastError
If this is not done, then things don't work as expected when
an error occurs
GODDAMN MICROSOFT!
*/
CustomWaitOnAddress :: proc "system" (Address: rawptr, CompareAddress: rawptr, AddressSize: uint, Timeout: ^i64) -> bool {
status := RtlWaitOnAddress(Address, CompareAddress, AddressSize, Timeout)
if status != 0 {
SetLastError(RtlNtStatusToDosError(status))
}
return status == 0
}
_futex_wait :: proc "contextless" (f: ^Futex, expect: u32) -> bool {
expect := expect
return CustomWaitOnAddress(f, &expect, size_of(expect), nil)
}
_futex_wait_with_timeout :: proc "contextless" (f: ^Futex, expect: u32, duration: time.Duration) -> bool {
expect := expect
// NOTE(bill): for some bizarre reason, this has to be a negative number
timeout := -i64(duration / 100)
return CustomWaitOnAddress(f, &expect, size_of(expect), &timeout)
}
_futex_signal :: proc "contextless" (f: ^Futex) {
WakeByAddressSingle(f)
}
_futex_broadcast :: proc "contextless" (f: ^Futex) {
WakeByAddressAll(f)
}
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