aio: add TODOs

src/aio/IoUring.zig

@@ -28,6 +28,14 @@ const Supported = struct {
     }
 };
 
+// TODO: Support IOSQE_FIXED_FILE
+// TODO: Support IOSQE_BUFFER_SELECT
+// TODO: Support IOSQE_IO_DRAIN
+// TODO: Support IOSQE_ASYNC
+
+// Could also make io_uring based event source with `IORING_OP_MSG_RING`
+// However I've read some claims that passing messages to other ring has more
+// latency than actually using eventfd. Eventfd is simple and reliable.
 pub const EventSource = posix.EventSource;
 
 io: std.os.linux.IoUring,

src/aio/ops.zig

@@ -18,6 +18,9 @@ const SharedError = error{
     Unexpected,
 };
 
+// TODO: Support rest of the ops from <https://man.archlinux.org/man/io_uring_enter.2.en>
+//       Even linux/io_uring only ops
+
 /// Can be used to wakeup the backend, custom notifications, etc...
 pub const Nop = struct {
     pub const Error = SharedError;
@@ -265,8 +268,6 @@ pub const SymlinkAt = struct {
     userdata: usize = 0,
 };
 
-// TODO: linkat
-
 /// std.process.Child.wait
 pub const ChildExit = struct {
     pub const Error = error{ NotFound, Unexpected } || SharedError;