feat: implement poll op on windows (#198)

Author: JinWeiTan

README-zh.md

@@ -35,7 +35,7 @@ Monoio 就是这样一个 Runtime：它并不像 Tokio 那样通过公平调度
 
 同时，如果你想使用 io_uring，你需要确保你当前的内核版本是较新的([5.6+](docs/zh/platform-support.md))；并且 memlock 是一个[合适的配置](docs/zh/memlock.md)。如果你的内核版本不满足需求，可以尝试使用 legacy driver 启动([参考这里](/docs/zh/use-legacy-driver.md))，当前支持 Linux 和 macOS。
 
-🚧实验性的 windows 系统支持正在开发中，你需要确保你的 windows 版本支持 ([Windows Build 22000](https://docs.microsoft.com/zh-CN/windows/win32/api/ioringapi/ns-ioringapi-ioring_capabilities))。
+🚧实验性的 windows 系统支持正在开发中。
 
 这是一个非常简单的例子，基于 Monoio 实现一个简单的 echo 服务。运行起来之后你可以通过 `nc 127.0.0.1 50002` 来连接它。
 

README.md

@@ -32,7 +32,7 @@ To force using nightly, create a file named `rust-toolchain` and write `nightly`
 
 Also, if you want to use io_uring, you must make sure your kernel supports it([5.6+](docs/en/platform-support.md)). And, memlock is [configured as a proper number](docs/en/memlock.md). If your kernel version does not meet the requirements, you can try to use the legacy driver to start, currently supports Linux and macOS([ref here](/docs/en/use-legacy-driver.md)).
 
-🚧Experimental windows support is on the way, if you want to use windows you must make sure your windows supports it([Windows Build 22000](https://docs.microsoft.com/en-us/windows/win32/api/ioringapi/ns-ioringapi-ioring_capabilities)).
+🚧Experimental windows support is on the way.
 
 Here is a basic example of how to use Monoio.
 

monoio/src/driver/op/poll.rs

@@ -1,10 +1,19 @@
 use std::io;
+#[cfg(windows)]
+use std::{
+    io::{Error, ErrorKind},
+    os::windows::prelude::AsRawSocket,
+};
 
 #[cfg(all(target_os = "linux", feature = "iouring"))]
 use io_uring::{opcode, types};
+#[cfg(windows)]
+use windows_sys::Win32::Networking::WinSock::{
+    WSAGetLastError, WSAPoll, POLLIN, POLLOUT, SOCKET_ERROR, WSAPOLLFD,
+};
 
 use super::{super::shared_fd::SharedFd, Op, OpAble};
-#[cfg(all(unix, feature = "legacy"))]
+#[cfg(feature = "legacy")]
 use crate::driver::legacy::ready::Direction;
 
 pub(crate) struct PollAdd {
@@ -14,7 +23,7 @@ pub(crate) struct PollAdd {
     fd: SharedFd,
     // true: read; false: write
     is_read: bool,
-    #[cfg(all(unix, feature = "legacy"))]
+    #[cfg(feature = "legacy")]
     relaxed: bool,
 }
 
@@ -23,7 +32,7 @@ impl Op<PollAdd> {
         Op::submit_with(PollAdd {
             fd: fd.clone(),
             is_read: true,
-            #[cfg(all(unix, feature = "legacy"))]
+            #[cfg(feature = "legacy")]
             relaxed: _relaxed,
         })
     }
@@ -32,7 +41,7 @@ impl Op<PollAdd> {
         Op::submit_with(PollAdd {
             fd: fd.clone(),
             is_read: false,
-            #[cfg(all(unix, feature = "legacy"))]
+            #[cfg(feature = "legacy")]
             relaxed: _relaxed,
         })
     }
@@ -57,7 +66,7 @@ impl OpAble for PollAdd {
         .build()
     }
 
-    #[cfg(all(unix, feature = "legacy"))]
+    #[cfg(feature = "legacy")]
     fn legacy_interest(&self) -> Option<(Direction, usize)> {
         self.fd.registered_index().map(|idx| {
             (
@@ -92,4 +101,29 @@ impl OpAble for PollAdd {
         }
         Ok(0)
     }
+
+    #[cfg(windows)]
+    fn legacy_call(&mut self) -> io::Result<u32> {
+        if !self.relaxed {
+            let mut pollfd = WSAPOLLFD {
+                fd: self.fd.as_raw_socket(),
+                events: if self.is_read {
+                    POLLIN as _
+                } else {
+                    POLLOUT as _
+                },
+                revents: 0,
+            };
+            let ret = unsafe { WSAPoll(&mut pollfd as *mut _, 1, 0) };
+            match ret {
+                0 => return Err(ErrorKind::WouldBlock.into()),
+                SOCKET_ERROR => {
+                    let error = unsafe { WSAGetLastError() };
+                    return Err(Error::from_raw_os_error(error));
+                }
+                _ => (),
+            }
+        }
+        Ok(0)
+    }
 }