![]() ![]() ![]() We will start with the FortuneThread class, which handles the network code.įortuneThread( QObject *parent = nullptr) But contrary to what many think, using threads with QThread does not necessarily add unmanagable complexity to your application. ![]() Use of Qt's blocking network API often leads to simpler code, but because of its blocking behavior, it should only be used in non-GUI threads to prevent the user interface from freezing. The purpose of this example is to demonstrate a pattern that you can use to simplify your networking code, without losing responsiveness in your user interface. The implementation is very similar to the Fortune Client example, but instead of having QTcpSocket as a member of the main class, doing asynchronous networking in the main thread, we will do all network operations in a separate thread and use QTcpSocket's blocking API. In non-GUI and multithreaded applications, you can call the waitFor.() functions (e.g., QTcpSocket::waitForConnected()) to suspend the calling thread until the operation has completed, instead of connecting to signals. For example, QTcpSocket::connectToHost() returns immediately, and when the connection has been established, QTcpSocket emits connected(). When the operation is finished, QTcpSocket emits a signal. Operations are scheduled and performed when control returns to Qt's event loop. The asynchronous (non-blocking) approach.Thus, Equation (9) is equivalent to system (2), thereby completing the proof.Ĥ.QTcpSocket supports two general approaches to network programming: We study the following 2 × 2 cooperative hyperbolic systems with Neuman conditions:īy the Cauchy Schwarz inequality, we haveīy satisfying (7), system (3) has a unique solution:Īs follows, and then integrate it over Q:īy summing the two equations, and from (6), (8), and (9), we obtain We list them briefly below:ĭenotes the space of measurable functions The Sobolev spaces of infinite order operators, which are used in this study, have already been presented in Reference. Finally, in Section 5, the formulation of the control problem for boundary observation function is studied. In Section 4, the nascency and sufficient conditions for optimal boundary control are derived. ![]() In Section 3, the state of the cooperative system with Neumann conditions is discussed. Section 2 presents the Sobolev spaces of infinite order, which we refer to later in the paper. The rest of this paper is organized into four sections. (This implies that the system (1) is cooperative.) Where a, b, c,and d are constant such that īased on the theories proposed by Lions and Dubinskii, the distributed control problem with Dirichlet conditions for 2 × 2 non-cooperative hyperbolic systems involving infinite order operators was discussed in a previous study in this study, we extend this problem to cooperative hyperbolic systems of the boundary type with Neumann conditions for different observation functions. These problems were then extended in different ways, such as for higher system degrees, and for parabolic and hyperbolic systems. References were among the first studies that presented the control problems of systems including infinite order operators. Majority of the research in this field has focused on discussing the optimal control problem by using several operator types (such as elliptic, parabolic, or hyperbolic operators) -, and by varying the nature of control (such as distributed control and boundary control ). The earliest theory of optimal control was introduced by Lions. ![]()
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