Add sync/channel_*.odin files

core/sync/channel_unix.odin

@@ -0,0 +1,20 @@
+// +build linux, darwin
+package sync
+
+import "core:time"
+
+raw_channel_wait_queue_wait_on :: proc(state: ^uintptr, timeout: time.Duration) {
+	// stub
+}
+
+raw_channel_wait_queue_signal :: proc(q: ^Raw_Channel_Wait_Queue) {
+	// stub
+}
+
+
+raw_channel_wait_queue_broadcast :: proc(q: ^Raw_Channel_Wait_Queue) {
+	for x := q^; x != nil; x = x.next {
+		q^ = x.next;
+		// stub
+	}
+}

core/sync/channel_windows.odin

@@ -0,0 +1,33 @@
+package sync
+
+import "intrinsics"
+import win32 "core:sys/windows"
+import "core:time"
+
+raw_channel_wait_queue_wait_on :: proc(state: ^uintptr, timeout: time.Duration) {
+	ms := win32.DWORD(win32.INFINITE);
+	if max(time.Duration) != SELECT_MAX_TIMEOUT {
+		ms = win32.DWORD((max(time.duration_nanoseconds(timeout), 0) + 999999)/1000000);
+	}
+
+	v := intrinsics.atomic_load(state);
+	for v == 0 {
+		win32.WaitOnAddress(state, &v, size_of(state^), ms);
+		v = intrinsics.atomic_load(state);
+	}
+	intrinsics.atomic_store(state, 0);
+}
+
+raw_channel_wait_queue_signal :: proc(q: ^Raw_Channel_Wait_Queue) {
+	for x := q; x != nil; x = x.next {
+		intrinsics.atomic_add(x.state, 1);
+		win32.WakeByAddressSingle(x.state);
+	}
+}
+
+raw_channel_wait_queue_broadcast :: proc(q: ^Raw_Channel_Wait_Queue) {
+	for x := q; x != nil; x = x.next {
+		intrinsics.atomic_add(x.state, 1);
+		win32.WakeByAddressAll(x.state);
+	}
+}