m(windows): Reimplement Wepoll in Rust (#88)

Reimplements the C-based wepoll backend in Rust, using some handwritten code. This PR also implements bindings to the I/O Completion Ports and \Device\Afd APIs. For more information on the latter, see my blog post on the subject: https://notgull.github.io/device-afd/

Note that the IOCP API is wrapped using a `Pin`-oriented "CompletionHandle" system that is relatively brittle. This should be replaced with a better model when one becomes available.

Cargo.toml

@@ -7,10 +7,10 @@ version = "2.5.2"
 authors = ["Stjepan Glavina <[email protected]>"]
 edition = "2018"
 rust-version = "1.47"
-description = "Portable interface to epoll, kqueue, event ports, and wepoll"
+description = "Portable interface to epoll, kqueue, event ports, and IOCP"
 license = "Apache-2.0 OR MIT"
 repository = "https://github.com/smol-rs/polling"
-keywords = ["mio", "epoll", "kqueue", "iocp", "wepoll"]
+keywords = ["mio", "epoll", "kqueue", "iocp"]
 categories = ["asynchronous", "network-programming", "os"]
 exclude = ["/.*"]
 
@@ -32,13 +32,19 @@ autocfg = "1"
 libc = "0.2.77"
 
 [target.'cfg(windows)'.dependencies]
-wepoll-ffi = { version = "0.1.2", features = ["null-overlapped-wakeups-patch"] }
+bitflags = "1.3.2"
+concurrent-queue = "2.1.0"
+pin-project-lite = "0.2.9"
 
 [target.'cfg(windows)'.dependencies.windows-sys]
 version = "0.45"
 features = [
+    "Win32_Networking_WinSock",
     "Win32_System_IO",
-    "Win32_Foundation"
+    "Win32_System_LibraryLoader",
+    "Win32_System_WindowsProgramming",
+    "Win32_Storage_FileSystem",
+    "Win32_Foundation",
 ]
 
 [dev-dependencies]

README.md

@@ -9,15 +9,15 @@ https://crates.io/crates/polling)
 [![Documentation](https://docs.rs/polling/badge.svg)](
 https://docs.rs/polling)
 
-Portable interface to epoll, kqueue, event ports, and wepoll.
+Portable interface to epoll, kqueue, event ports, and IOCP.
 
 Supported platforms:
 - [epoll](https://en.wikipedia.org/wiki/Epoll): Linux, Android
 - [kqueue](https://en.wikipedia.org/wiki/Kqueue): macOS, iOS, tvOS, watchOS, FreeBSD, NetBSD, OpenBSD,
   DragonFly BSD
 - [event ports](https://illumos.org/man/port_create): illumos, Solaris
 - [poll](https://en.wikipedia.org/wiki/Poll_(Unix)): VxWorks, Fuchsia, other Unix systems
-- [wepoll](https://github.com/piscisaureus/wepoll): Windows, Wine (version 7.13+)
+- [IOCP](https://learn.microsoft.com/en-us/windows/win32/fileio/i-o-completion-ports): Windows, Wine (version 7.13+)
 
 Polling is done in oneshot mode, which means interest in I/O events needs to be reset after
 an event is delivered if we're interested in the next event of the same kind.