JP2015075836A - Execution method of virtual machine, computer program and information processing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an execution method of a virtual machine capable of preventing an application that is executed on the virtual machine, from falling into an execution stop state even in the case where a time that the virtual machine references is changed, a computer program and an information processing apparatus.SOLUTION: In the case where each of a Web server 14 and a time synchronization application 15 operating on an operation system 11 including a system clock for counting a time sets the time of the system clock 111 by receiving a setting request of a time from a Web browser of a PC connected to a home gateway 5 or by being temporally synchronized with an NTP server connected to the Internet, Java VM 13 is re-activated for executing on the operating system 11 a Java application 12 to which a thread requesting execution of processing (e.g., Threada. sleep) corresponding to a time defining the time of the system clock 111 as a reference belongs.

Description

  The present invention relates to a virtual machine execution method, a computer program, and an information processing apparatus in an information processing apparatus that executes an application in a virtual machine on an operating system.

  In recent years, the Java (registered trademark) environment, which is an object-oriented language proposed by Sun Microsystems, has become widespread as a method for realizing highly extensible services using multimedia data such as images, sounds, and moving images. ing.

  In the Java environment, image data is downloaded via a communication medium such as the Internet in response to a request from a Java application configured with an intermediate code based on a source code described in the Java language, and the downloaded image is downloaded to the Java environment. Used in apps.

  The Java application is executed in parallel as one or a plurality of processes, and a thread generated and executable in each process is assigned with a CPU resource and executed by the Java VM. For example, when a processing request for waiting for a predetermined time is included in a specific thread, the specific thread can be executed when the predetermined time elapses (see Patent Document 1).

JP 2010-015291 A

  However, if the time referred to by the Java VM is changed while the specific thread is waiting, and the time referred to immediately after the change is earlier than the time referred to immediately before the change, the waiting end time Due to the delay in arrival, other threads waiting for the thread to become executable may continue to be in a standby state, and the entire Java application may be substantially stopped.

  The present invention has been made in view of such circumstances, and an object of the present invention is to stop execution of an application executed on a virtual machine even when the time referred to by the virtual machine is changed. An object of the present invention is to provide a virtual machine execution method, a computer program, and an information processing apparatus that can prevent the user from falling into a computer.

  An execution method of a virtual machine according to the present invention includes a virtual machine that executes an application on an operating system having a system clock that measures time, and a thread belonging to the application has a time based on the time of the system clock. In the virtual machine execution method in the information processing apparatus that requests the virtual machine to execute a corresponding process, a time setting application for setting the time of the system clock is executed on the operating system, and the time setting application is When the time is set, the virtual machine is restarted.

  The virtual machine execution method according to the present invention is characterized in that the virtual machine is a Java VM.

  In the virtual machine execution method according to the present invention, the process is performed by thread. It is a sleep.

  The virtual machine execution method according to the present invention provides an interface for connecting the information processing apparatus to the Internet, and the time setting application sets the time in synchronization with an NTP server connected to the Internet. It is characterized by that.

  The virtual machine execution method according to the present invention provides an interface for connecting the information processing apparatus to a network, and the time setting application is a web application accessed from a web browser via the interface, The web application receives the time setting request from the web browser and sets the time.

  The virtual machine execution method according to the present invention is characterized in that, when the virtual machine is restarted, the web application transmits predetermined information to the web browser.

  An execution method of a virtual machine according to the present invention provides an interface for connecting a light source to the information processing apparatus, executes a light source control application for controlling lighting of the light source on the operating system, and the virtual machine When restarting, the light source control application turns on or blinks the light source.

  The computer program according to the present invention provides an operating system to which an application to which a thread that requests execution of processing according to time based on the time of the system clock belongs to a computer having an operating system having a system clock for measuring time. In the computer program to be executed on the upper virtual machine, the step of causing the computer to execute a time setting application for setting the time of the system clock on the operating system, and when the time setting application sets the time, the computer And a step of restarting the virtual machine.

  An information processing apparatus according to the present invention includes a virtual machine that executes an application on an operating system having a system clock that measures time, and a thread belonging to the application responds to a time based on the time of the system clock. In the information processing apparatus that requests the virtual machine to execute processing, a means for executing a time setting application for setting the time of the system clock on the operating system, and when the time setting application sets the time, Means for restarting the virtual machine.

In the present invention, when a time setting application operating on an operating system having a system clock for measuring time sets the time of the system clock, the time of the system clock (that is, the time measured by the system clock) is set. A virtual machine that executes on the operating system an application to which a thread that requests execution of processing according to a reference time belongs is restarted.
In other words, if the virtual machine refers to the time of the system clock via the operating system and the virtual machine changes the reference time for executing the processing requested by the thread, the virtual machine is restarted Then, the execution of the application is initialized.

  In the present invention, even if the virtual machine that executes the application is the Java VM and the time of the system clock is changed, the Java application that is executed by the Java VM is prevented from being stopped.

  In the present invention, the processing according to the time based on the time of the system clock is Thread. Even if it is a sleep function and the time of the system clock is set and changed, it is possible to prevent the thread from being stopped longer than the time requested by the function.

In the present invention, the time of the system clock is synchronized with the NTP server connected to the Internet by the time setting application.
Thereby, when the time of the system clock is synchronized with the NTP server, the Java VM is restarted.

In the present invention, a web application accessed from a web browser via an interface for connecting to a network receives a time setting request from the web browser and sets the time of the system clock.
Thereby, when the time of the system clock is set by a request from the web browser, the Java VM is restarted.

In the present invention, when the virtual machine is restarted, the web application transmits predetermined information to a web browser that accesses the virtual machine.
This notifies the user who operates the web browser that the virtual machine has been restarted.

In the present invention, when the virtual machine is restarted, the light source connected to the predetermined interface is turned on or blinked by the light source control application operating on the operating system.
This notifies the user around the light source that the virtual machine has been restarted.

According to the present invention, when the virtual machine refers to the time of the system clock via the operating system and the virtual machine changes the reference time for executing the processing requested by the thread, the virtual machine The machine restarts and application execution is initialized.
Therefore, even when the time referred to by the virtual machine is changed, it is possible to prevent the application executed on the virtual machine from entering an execution stop state.

It is a block diagram which shows the structure of a home energy management system provided with the information processing apparatus which concerns on this invention. It is a block diagram which shows the structure of information processing apparatus. It is an illustration figure of the source code of the thread which belongs to a Java application. It is a flowchart which shows the process sequence of CPU which sets the time of a system clock by a Web server. It is a flowchart which shows the process sequence of CPU which sets the time of a system clock by a time synchronization application. It is a flowchart which shows the process sequence of CPU which restarts JavaVM by an application management part. It is a flowchart which shows the process sequence of CPU which blinks LED by LED control application.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
FIG. 1 is a block diagram showing a configuration of a home energy management system (Home Energy Management System; hereinafter referred to as HEMS) including an information processing apparatus according to the present invention. In the figure, reference numeral 1 denotes an information processing apparatus. The information processing apparatus 1 is connected to the Internet 4 to which an NTP (Network Time Protocol) server 3 is connected via a home gateway 5 having a broadband router function. A personal computer (hereinafter referred to as a PC) 2 is connected to the home gateway 5. For example, the PC 2 may be connected to the Internet 4 or may be a mobile phone such as a smartphone connected via a wireless communication line (not shown).

  Connected to the information processing apparatus 1 are USB wireless transmitter / receivers (hereinafter referred to as USB T / R, indicated by T / R in the figure) 6 and 6 by USB interfaces 22 and 22 described later. Each of the USBT / Rs 6 and 6 and the sensors 9 and 9 disposed on the distribution board 7 and the window 8 are configured to be able to perform wireless communication. A sensor 9 disposed on the distribution board 7 detects household power consumption and opens and closes a power circuit. The sensor 9 disposed in the window 8 detects the brightness around the window 8 and detects the intrusion of a person into the room.

  In the HEMS configuration described above, the information processing apparatus 1 collects power data and illuminance data from the sensors 9 and 9 by the USBT / Rs 6 and 6 and totals the amount of power used. Is controlled according to the illuminance data. The information processing apparatus 1 also has a home server function. For example, when accessed from a browser installed in the PC 2, the home power consumption graph is displayed on the browser of the access source, or from the browser. The power of indoor electric products can be turned on and off by the control. Further, when a person enters through the window 8, it can be notified to a mobile phone (not shown).

Next, the configuration and function of the main part of the information processing apparatus 1 will be described.
FIG. 2 is a block diagram illustrating a configuration of the information processing apparatus 1. The information processing apparatus 1 includes a CPU 10 that implements a functional block using software (hereinafter referred to as S / W) and peripheral hardware (hereinafter referred to as H / W) 20 of the CPU 10.

  The functional blocks based on S / W include an operating system (hereinafter referred to as OS) 11 such as Linux (registered trademark), a Java VM (Java Virtual Machine) 13 as a virtual machine that executes the Java application 12, and a server S. / W web server (hereinafter referred to as Web server) 14, time synchronization application (hereinafter referred to as time synchronization application) 15 for time synchronization with NTP server 3, and LED control for controlling turning on / off of LED 23 described later Application (light source control application; hereinafter referred to as LED control application) 16.

  The OS 11 is not limited to Linux, and may be another OS such as Windows (registered trademark). The virtual machine is not limited to the Java VM 13 and may be another virtual machine such as a dot net framework (.Net Framework) by Microsoft Corporation.

  The Java VM 13 and the LED control application 16 operate on the OS 11 executed by the CPU 10. The Web server 14 and the time synchronization application 15 operate on the OS 11 executed by the CPU 10 as a time setting application for setting the time of a system clock 111 to be described later.

  The peripheral H / W 20 is connected to an Ethernet interface (interface for connecting to the Internet or a network; hereinafter referred to as Ethernet I / F; Ethernet is a registered trademark) 21 and USBT / R 6 and 6 to connect to the home gateway 5. USB interfaces (hereinafter referred to as USB I / F) 22 and 22 and LEDs (light sources including an interface for connecting a light source) 23 for performing predetermined notification to the user are configured. . The LED 23 may be connected to the outside from the peripheral H / W via a signal cable. The Ethernet I / F 21, USB I / Fs 22 and 22, and the LED 23 are operated from the OS 11 via respective device drivers incorporated in the OS 11.

  The OS 11 manages a system clock 111 that measures time based on time information acquired at the time of startup from a real time clock (not shown) included in the peripheral H / W 20, and activation, stop, restart, and the like of each application that operates on the OS 11. Application management unit 112. Reading of the time from the system clock 111 by each application is performed by a system call to the OS 11. That is, when there is a system call for acquiring time information, the OS 11 reads the time counted by the system clock 111 and sets it as the return value of the system call.

  The Java application 12 realizes the function of the above-described HEMS home server. The Java application 12 communicates with the sensors 9 and 9 via the USBT / Rs 6 and 6 and the USB I / Fs 22 and 22, and the PC 2 via the home gateway 5. Communicate with. The Java application 12 is an application configured with an intermediate code based on a source code described in the Java language.

  FIG. 3 is an exemplary diagram of source code of threads belonging to the Java application 12. The source code written in the Java language is compiled in advance, converted into intermediate code, and mounted on the actual machine. In the figure, Thread. sleep (5000) is a sleep function. The sleep function is one of the functions “requests the Java VM 13 to execute processing according to the time based on the time of the system clock 111”. Thread. The sleep (5000) requests that the thread that has called this function be stopped for 5000 ms (hereinafter referred to as sleep).

  The “request Java VM 13 to execute processing according to the time based on the time of the system clock 111” function is a thread. It is not limited to sleep (). For example, Thread. join (), Object. Another function with a timeout parameter such as wait () may be used.

  Returning to FIG. 2, the Java VM 13 sequentially interprets the intermediate code constituting the Java application 12, converts it into a machine language that can be executed by the CPU 10, and executes it. This function of the Java VM 13 realizes an environment in which the Java application 12 can be executed on any platform without depending on a specific OS or processor.

  When the Java VM 13 requests the Java application 12 to execute a process according to the time based on the time of the system clock 111, the Java VM 13 stores a time information storage unit 131 for storing the time related to the execution of the requested process. Comprising. For example, Thread. When sleep (t) is called, the Java VM 13 reads the time from the system clock 111, stores the time obtained by adding the time t (ms) to the read time in the time information storage unit 131, and the stored time has arrived. Sometimes Thread. Resume execution of the thread that called sleep (t).

  The Web server 14 is a Web application in which a program for providing a Web user interface screen such as time setting is incorporated, and communicates with the PC 2 via the home gateway 5 and the Ethernet I / F 21. The time setting program is activated when the browser installed in the PC 2 accesses the Web server 14 and operates together with the Web server 14. When the Web server 14 receives a time setting request from the browser and sets the time in the system clock 111, the Web server 14 requests the application management unit 112 to restart the Java VM 13.

  When the set time arrives, the time synchronization application 15 communicates with the NTP server 3 connected to the Internet 4 via the home gateway 5 and the Ethernet I / F 21, and executes the NTP protocol or the SNTP protocol. When the time of the clock 111 is synchronized with the time of the NTP server 3, the application management unit 112 is requested to restart the Java VM 13.

  Here, when the Web server 14 sets the time in the system clock, or the time synchronization application 15 synchronizes the time of the system clock 111 with the time of the NPT server 3, the time of the system clock 111 is changed to the system clock 111. When the thread is changed to a time before the time that is referenced immediately before setting or synchronization is performed, the thread happens to be threaded. When sleep (t) is called and the system is sleeping, the sleep time of the thread is extended by the amount that the time of the system clock 111 is traced back to the past. In other words, until the time of the system clock 111 catches up to the time before the change, there is a possibility that the Java application 12 including the sleeping thread may not be able to operate at all for a long time.

  On the contrary, when the time of the system clock 111 is changed to a time earlier than the time referred to immediately before the time setting or synchronization with the system clock 111 is performed, the time by which the time of the system clock 111 is advanced. As a result, the sleep time of the thread is shortened, and the operation of the thread becomes unnatural. On the other hand, after the time of the system clock 111 is changed by the Web server 14 and the time referred to immediately after the change is earlier than the time referred to immediately before the change, the time of the system clock 111 is changed by the time synchronization application 15. If correct, the time of the system clock 111 is pulled back to the past. Therefore, in this case as well, the same problem occurs when the time of the system clock 111 is changed by the Web server 14 and the time referred to immediately after the change is changed to a time before the time referred to immediately before the change.

  Therefore, in the present invention, when the time of the system clock 111 is changed, restart of the Java VM 13 is requested. More preferably, when the time of the system clock 111 is set by the Web server 14 and the time referred to immediately after the setting is a time before the time referred to immediately before the setting, the past time is counted. When the system clock 111 is time-synchronized with the NTP server 3 by the time synchronization application 15, the restart of the Java VM 13 is requested.

  When the restart of the Java VM 13 is requested from the Web server 14 or the time synchronization application 15, the application management unit 112 restarts the Java VM 13 and notifies the Web server 14 and the LED control application 16 to that effect.

  When notified that the Java VM 13 has been restarted, the LED control application 16 causes the LED 23 to blink. In this case, the LED 23 may be lit with an arbitrary lighting pattern.

  Hereinafter, the operation of the above-described S / W functional block will be described with reference to a flowchart showing the operation. The processing shown below is executed by the CPU 10 in accordance with a control program stored in advance in a ROM (not shown) included in the peripheral H / W 20. Information or signals exchanged in the following processing are shown by solid lines with arrows in FIG.

First, a case where the time of the system clock 111 is set through the Web server 14 will be described.
FIG. 4 is a flowchart showing a processing procedure of the CPU 10 for setting the time of the system clock 111 by the Web server 14. The process of FIG. 4 is activated in a timely manner when access from an external browser becomes possible. Here, for simplicity, it is assumed that the Web server 14 only accepts access to the time setting screen.

  When the process of FIG. 4 is started, the CPU 10 determines whether or not there is an access to the Web server 14 by, for example, an HTTP request (S10), and waits until there is an access (S10: NO). When there is access (S10: YES), the CPU 10 determines whether or not the URL included in the HTTP request or the like indicates access to the time setting screen (S11). If the access is not indicated (S11: NO), the process proceeds to step S10 to wait for access to the Web server.

  When the URL indicates access to the time setting screen (S11: YES), the CPU 10 reads the time of the system clock 111 (S12), and the time setting screen (Web user interface screen) on which the read time is displayed. Is generated (S13), and the screen data of the generated screen is transmitted to the access source browser (S14).

  Thereafter, the CPU 10 determines whether or not a time setting request is received from the access source browser (S15), and waits until a time setting request is received (S15: NO). When the time setting request is received (S15: YES), the CPU 10 sets the time included in the time setting request to the system clock 111 (S16), and further restarts the Java VM 13 to the application management unit 112. Is requested (S17).

  In step S16, when the time of the system clock 111 is set and the time referred to immediately after the setting is a time before the time referred to immediately before the setting, the process proceeds to step S17. It is preferable to end the process of FIG. As a result, it is possible to effectively prevent a state in which the Java application 12 including the sleeping thread cannot operate at all for a long time.

  Thereafter, the CPU 10 determines whether or not there is a restart notification of the Java VM 13 from the application management unit 112 (S18), and waits until there is a restart notification (S18: NO). When there is a restart notification of the Java VM 13 (S18: YES), the CPU 10 generates a restart notification screen displayed, for example, in a pop-up on the time setting screen provided to the access source browser (S19). The screen data of the generated screen is transmitted to the access source browser (S20), and the processing of FIG.

Next, a case where the time of the system clock 111 is set through the time synchronization application 15 will be described.
FIG. 5 is a flowchart showing a processing procedure of the CPU 10 for setting the time of the system clock 111 by the time synchronization application 15. The processing in FIG. 5 is started, for example, every second, but is not limited thereto. It is assumed that the time to be synchronized with the NTP server 3 (more specifically, the time to perform the time synchronization process) is set in a RAM (not shown) included in the peripheral H / W 20.

  When the process of FIG. 5 is activated, the CPU 10 reads the time of the system clock 111 (S21), and determines whether or not the time to be synchronized with the NTP server 3 set in the RAM has come by the read time. If it is determined (S22) and the time has not arrived (S22: NO), the process of FIG. 5 is terminated without performing other processes.

  When the time to synchronize with the NTP server 3 has arrived (S22: YES), the CPU 10 executes the NTP protocol (or SNTP protocol) (S23) to adjust the time to the system clock 111. Then, the application management unit 112 is requested to restart the Java VM 13 (S25), and the processing in FIG. 5 is terminated.

  In step S24, when the time of the system clock 111 is set and the time referred to immediately after the setting is a time before the time referred to immediately before the setting, the process proceeds to step S25. It is preferable to end the process of FIG. As a result, it is possible to effectively prevent a state in which the Java application 12 including the sleeping thread cannot operate at all for a long time.

Next, processing for restarting the Java VM 13 will be described.
FIG. 6 is a flowchart showing a processing procedure of the CPU 10 for restarting the Java VM 13 by the application management unit 112. The processing in FIG. 6 is started in a timely manner after the Java VM 13 is first started.

  When the processing of FIG. 6 is activated, the CPU 10 determines whether or not there is a request for restarting the Java VM 13 (S31), and waits until there is a request for restart (S31: NO). When there is a request to restart the Java VM 13 (S31: YES), the CPU 10 restarts the Java VM 13 (S32; shown by a broken line with an arrow in FIG. 2).

  Next, the CPU 10 notifies the LED control application 16 of the restart of the Java VM 13 (S33), and notifies the Web server 14 of the restart of the Java VM 13 (S34), and ends the processing of FIG.

Finally, a process for blinking the LED 23 will be described.
FIG. 7 is a flowchart showing a processing procedure of the CPU 10 for causing the LED control application 16 to blink the LED 23. The processing in FIG. 7 is activated in a timely manner with the Java VM 13 activated and the LED 23 turned off.

  When the process of FIG. 7 is started, the CPU 10 determines whether or not there is a restart notification of the Java VM 13 from the application management unit 112 (S41), and waits until there is a restart notification (S41: NO). When there is a restart notification of the Java VM 13 (S41: YES), the CPU 10 causes the LED 23 to blink (S42) and ends the process of FIG.

As described above, according to the present embodiment, when a time setting application operating on the operating system 11 having the system clock 111 that measures time sets the time in the system clock 111, the time of the system clock 111 is used as a reference. The virtual machine (Java VM 13) that executes on the operating system 11 the application (Java application 12) to which the thread that requests the execution of the process according to the time (Thread.sleep) to belong belongs is restarted.
In other words, when the Java VM 13 refers to the time of the system clock 111 via the operating system 11 and the Java VM 13 changes the reference time for executing the processing requested by the thread, the Java VM 13 is restarted. As a result, the execution of the Java application 12 is initialized.
Therefore, even when the time referred to by the virtual machine is changed, it is possible to prevent the application executed on the virtual machine from entering an execution stop state.

  Further, even when the virtual machine that executes the application is the Java VM 13 and the time of the system clock 111 is changed, it is possible to prevent the Java application 12 that is executed by the Java VM 13 from being stopped. .

  Further, processing according to the time based on the time of the system clock 111 is Thread. Even if it is a sleep function and the time of the system clock 111 is set and changed, it is possible to prevent the thread from stopping longer than the time requested by this function.

Furthermore, the time of the system clock 111 is synchronized with the NTP server 3 connected to the Internet 4 by the time setting application (time synchronization application 15).
Accordingly, the Java VM 13 can be restarted when the time of the system clock 111 is synchronized with the NTP server 3.

Furthermore, the Web application (Web server 14) accessed from the Web browser of the PC 2 via the Ethernet interface 21 for connecting to the network accepts a time setting request from the Web browser and sets the time of the system clock 111. To do.
Therefore, the Java VM 13 can be restarted when the time of the system clock 111 is set by a request from the Web browser.

Furthermore, when the virtual machine (Java VM 13) is restarted, the Web application (Web server 14) transmits predetermined information (screen data of a restart notification screen) to the Web browser accessing itself.
Thereby, it is possible to notify the user who operates the Web browser that the virtual machine has been restarted.

Furthermore, when the virtual machine (Java VM 13) is restarted, the light source (LED 23) connected to a predetermined interface is turned on or blinked by the light source control application (LED control application 16) operating on the operating system 11.
Therefore, it is possible to notify the users around the LED 23 that the virtual machine has been restarted.

  The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 Information processing device 10 CPU
11 OS (Operating System)
12 Java application (application)
13 JavaVM (virtual machine)
14 Web server (Web application)
15 Time synchronization application (time setting application)
16 LED control application 21 Ethernet I / F (interface for connecting to the Internet, interface for connecting to the network)
23 LED (light source)
2 PC
3 NTP server 4 Internet 5 Home gateway

Claims (9)

A virtual machine that executes an application on an operating system having a system clock that measures the time is provided, and a thread belonging to the application requests the virtual machine to execute a process according to a time based on the time of the system clock. In the method of executing the virtual machine in the information processing apparatus,
A time setting application for setting the time of the system clock is executed on the operating system;
The virtual machine execution method, wherein when the time setting application sets the time, the virtual machine is restarted.   The virtual machine execution method according to claim 1, wherein the virtual machine is a Java VM.   The process is the same as Thread. The virtual machine execution method according to claim 2, wherein the virtual machine execution method is a sleep. Providing an interface for connecting the information processing apparatus to the Internet;
4. The virtual machine execution method according to claim 1, wherein the time setting application sets the time in synchronization with an NTP server connected to the Internet. 5. Preparing an interface for connecting the information processing apparatus to a network;
The time setting application is a web application accessed from a web browser through the interface,
4. The virtual machine execution method according to claim 1, wherein the web application receives a time setting request from the web browser and sets the time. 5.   The virtual machine execution method according to claim 5, wherein when the virtual machine is restarted, the web application transmits predetermined information to the web browser. Preparing an interface for connecting a light source to the information processing apparatus;
A light source control application for controlling lighting of the light source is executed on the operating system;
The virtual machine execution method according to any one of claims 1 to 6, wherein when the virtual machine is restarted, the light source control application turns on or blinks the light source. A computer having an operating system having a system clock for measuring time is caused to execute on a virtual machine on the operating system an application to which a thread that requests execution of processing according to time based on the time of the system clock belongs. In a computer program,
Causing the computer to execute a time setting application for setting the time of the system clock on the operating system;
A computer program for causing a computer to restart the virtual machine when the time setting application sets the time. A virtual machine that executes an application on an operating system having a system clock that measures the time is provided, and a thread belonging to the application requests the virtual machine to execute a process according to a time based on the time of the system clock. In the information processing apparatus to
Means for executing a time setting application for setting the time of the system clock on the operating system;
An information processing apparatus comprising: means for restarting the virtual machine when the time setting application sets the time.

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