class PG::Connection

def cancel
	be_pid = backend_pid
	be_key = backend_key
	cancel_request = [0x10, 1234, 5678, be_pid, be_key].pack("NnnNN")
	if Fiber.respond_to?(:scheduler) && Fiber.scheduler && RUBY_PLATFORM =~ /mingw|mswin/
		# Ruby's nonblocking IO is not really supported on Windows.
		# We work around by using threads and explicit calls to wait_readable/wait_writable.
		cl = Thread.new(socket_io.remote_address) { |ra| ra.connect }.value
		begin
			cl.write_nonblock(cancel_request)
		rescue IO::WaitReadable, Errno::EINTR
			cl.wait_writable
			retry
		end
		begin
			cl.read_nonblock(1)
		rescue IO::WaitReadable, Errno::EINTR
			cl.wait_readable
			retry
		rescue EOFError
		end
	elsif RUBY_ENGINE == 'truffleruby'
		begin
			cl = socket_io.remote_address.connect
		rescue NotImplementedError
			# Workaround for truffleruby < 21.3.0
			cl2 = Socket.for_fd(socket_io.fileno)
			cl2.autoclose = false
			adr = cl2.remote_address
			if adr.ip?
				cl = TCPSocket.new(adr.ip_address, adr.ip_port)
				cl.autoclose = false
			else
				cl = UNIXSocket.new(adr.unix_path)
				cl.autoclose = false
			end
		end
		cl.write(cancel_request)
		cl.read(1)
	else
		cl = socket_io.remote_address.connect
		# Send CANCEL_REQUEST_CODE and parameters
		cl.write(cancel_request)
		# Wait for the postmaster to close the connection, which indicates that it's processed the request.
		cl.read(1)
	end
	cl.close
	nil
rescue SystemCallError => err
	err.to_s
end