src/vs/server/node/extensionHostConnection.ts/ExtensionHostConnection/_cleanResources
class ExtensionHostConnection:	private _cleanResources(): void {
		if (this._disposed) {
			// already called
			return;
		}
		this._disposed = true;
		if (this._connectionData) {
			this._connectionData.socket.end();
			this._connectionData = null;
		}
		if (this._extensionHostProcess) {
			this._extensionHostProcess.kill();
			this._extensionHostProcess = null;
		}
		this._onClose.fire(undefined);
	}