From 00b8607fc1338aa478b34d56121c1a6e3344102d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=B6nke=20Ludwig?= <sludwig@rejectedsoftware.com>
Date: Sun, 15 Mar 2020 20:24:55 +0100
Subject: [PATCH] Fix IOMode.immediate for Windows sockets to guarantee calling
 the callback.

---
 source/eventcore/drivers/winapi/sockets.d | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/source/eventcore/drivers/winapi/sockets.d b/source/eventcore/drivers/winapi/sockets.d
index 051b111..8d82029 100644
--- a/source/eventcore/drivers/winapi/sockets.d
+++ b/source/eventcore/drivers/winapi/sockets.d
@@ -552,8 +552,11 @@ final class WinAPIEventDriverSockets : EventDriverSockets {
 			}
 		}
 
-		if (mode == IOMode.immediate)
+		if (mode == IOMode.immediate) {
 			() @trusted { CancelIoEx(cast(HANDLE)cast(SOCKET)socket, cast(LPOVERLAPPED)&slot.read.overlapped); } ();
+			on_read_finish(socket, IOStatus.wouldBlock, 0, null);
+			return;
+		}
 
 		slot.read.callback = on_read_finish;
 		addRef(socket);
@@ -646,8 +649,11 @@ final class WinAPIEventDriverSockets : EventDriverSockets {
 			}
 		}
 
-		if (mode == IOMode.immediate)
+		if (mode == IOMode.immediate) {
 			() @trusted { CancelIoEx(cast(HANDLE)cast(SOCKET)socket, cast(LPOVERLAPPED)&slot.write.overlapped); } ();
+			on_write_finish(socket, IOStatus.wouldBlock, 0, null);
+			return;
+		}
 
 		slot.write.callback = on_write_finish;
 		addRef(socket);