US 2008/0301673 A1 · Information Terminal, Computer Resource Managine Method, and Virtual Machine Execution Switching Method

Abstract

An in-vehicle terminal (101) is provided, which has a function ensuring that computer resource secured by a virtual machine (1a1) or a virtual machine (1b1) is controlled within a limit value of the computer resource that is allocated to the corresponding virtual machine, or a function which is capable of executing multiple virtual machines appropriately. When the virtual machine (1a1) or the virtual machine (1b1) requests securing the computer resource, the in-vehicle terminal (101) requests the OS (143) to secure computer resource in response to the request, if the requested resource is lower than the limit value of the computer resource that is allocated to the corresponding virtual machine. Furthermore, the in-vehicle terminal (101) checks at predetermined intervals the continuously selected count of the virtual machine previously selected, and if the continuously selected count is equal to the limit value, or the virtual machine is in standby state, a different virtual machine is selected and the OS (143) is instructed to execute the selected virtual machine.

Claims4

Dependent claims

An information terminal comprising,

a virtual machine which executes, on an OS (Operating System), an intermediate code program that is a program represented by an intermediate code;
a resource limit value storing means which stores a limit value of a computer resource which is usable by said virtual machine;
and
a resource managing means in which when a request for securing a resource is received from said virtual machine, the limit value stored in said resource limit value storing means is referred to, and
if the computer resource that becomes available for said virtual machine by securing the computer resource in response to the request is lower than said limit value, said OS is requested to secure the computer resource in response to the request, and
if the computer resource that becomes available for said virtual machine by securing the computer resource in response to the request is equal to or higher than said limit value, said OS is not requested to secure the computer resource in response to the request.

3 more elements

An information terminal comprising,

multiple virtual machines each executing, on an OS (Operating System), an intermediate code program being a program represented by an intermediate code;
a resource limit value storing means in which continuously selectable counts, each being the maximum continuously selectable count with respect to each of the multiple virtual machines, are stored so as to be respectively associated with said multiple virtual machines;
and
a virtual machine switching means which switches and executes each of said multiple virtual machines, based on said continuously selectable counts that are stored in said resource limit value storing means;
wherein, said virtual machine switching means
determines at predetermined intervals whether or not the virtual machine currently selected is in a standby state, and if the currently selected virtual machine is in the standby state, selects a virtual machine that is different from the currently selected virtual machine, instructs said OS to execute the selected virtual machine, and also sets a continuously selected count of the selected virtual machine to one;
if the currently selected virtual machine is in execution, refers to the continuously selectable count stored in said resource limit value storing means, and if the continuously selected count of the virtual machine currently selected is equal to the continuously selectable count associated with the currently selected virtual machine, selects a virtual machine different from the currently selected virtual machine, instructs the OS to execute the selected virtual machine, and also sets the continuously selected count of the selected virtual machine to one;
and
if the continuously selected count of the virtual machine currently selected is lower than the continuously selectable count associated with the currently selected virtual machine, selects again the currently selected virtual machine, instructs said OS to execute the reselected virtual machine, and increments the continuously selected count of the reselected virtual machine by one.

6 more elements

Dependencies are inferred from the claim text.

Information Terminal, Computer Resource Managine Method, and Virtual Machine Execution Switching Method

Life of this patent

Information Terminal, Computer Resource Managine Method, and Virtual Machine Execution Switching Method

Life of this patent

Abstract

Claims4