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win: prefer LPFN_CONNECTEX for asynchronous connect calls #151

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#158
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win: prefer LPFN_CONNECTEX for asynchronous connect calls#151
#158
@nikneym

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@nikneym
nikneym
opened on Mar 9, 2025

Currently connect is used on Windows to establish connections. This is a blocking call, WinSock 2 offers LPFN_CONNECTEX (that take OVERLAPPED) for asynchronous connect calls.

libxev/src/backend/iocp.zig

Lines 540 to 549 in 07bcffa

.connect => |*v| action: {
const result = windows.ws2_32.connect(asSocket(v.socket), &v.addr.any, @as(i32, @intCast(v.addr.getOsSockLen())));
if (result != 0) {
const err = windows.ws2_32.WSAGetLastError();
break :action switch (err) {
else => .{ .result = .{ .connect = windows.unexpectedWSAError(err) } },
};
}
break :action .{ .result = .{ .connect = {} } };
},

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