Omron Corporation

Yosuke Baba

Hiroyuki Yanagi

Motoyuki Kato

Yasuhiro Nishimura

Motoyuki Katoh

Shinji Nakagawa

Shiji Nakagawa

Kozo Moriyama

A program-executing apparatus has a simple configuration, is capable of executing high-speed processing, and is capable of providing high security. The apparatus is configured such that a host system wherein a program execution environment using a general-purpose OSis set and a subsystemwherein a virtual-machine execution environment is set are built into independent operation circuits, and a DPRAMis coupled to a general-purpose bus that connects the two operation circuits. In one of the systemsand, when a process to be requested to the other system has occurred, an interface built into each of the systems writes a command indicative of the contents of the process into the DPRAM, and outputs an interrupt to the remote system; and in response to an interrupt notified from the other system, the interface executes a process of reading a command written by the DPRAM

Program-executing apparatus and portable information processing apparatus

Method and class tables and an algorithm are provided for use in determining if a called method in a message should be retrieved and executed or a method search should initiated. The method table includes method name, method identifier, method overwrite data, class overwrite data and method memory storage location associated with the method related to the overwrite data. The algorithm sets a plurality of variables to an entry in the class table and at least one method and class data referenced in a message, searches the method table and sets search variables to the class and method overwrite data and determines if a predetermined relationship exists between the method and class identifier associated with the class and method data in the message as well as data in one of method entries. The method memory storage location is read out once a method entry with the predetermined relationship is found.

Program for generating method retrieval information and an arithmetic processing apparatus

In operation processing devices based on Java (a registered trademark), each time a functional program is executed, in response to a command to access that function, a work area for the program which is accessed is set up dynamically within the thread work area for the thread then being executed. By applying this processing in the case of an external interrupt as well, this invention eliminates the need to maintain a separate memory area for interrupt program processing. It simplifies the processing involved in sidetracking and restoring data and switching the program to be executed. The work area for a program being run is a dynamically created memory area according to this invention. When an interrupt is generated, the register data indicating the status and register state of the program being run at that time are sidetracked in the work area for that program.

Interrupt processing and memory management method in an operation processing device and a device using the same

A device is provided with a control device that activates a stack machine and that also controls thread switching. This will reduce both the hardware requirements and the number of development processes needed to produce a switching control mechanism. It will also allow the threads to be switched very rapidly. The circuit to control thread switching: 1) discriminates a next thread to be switched to; 2) sidetracks the register data indicating the current state of execution of the program stored in the control register group in the stack machine in response to the request to switch threads and stores them in a sidetracking area set up for the current thread; and 3) reads the register data out of the sidetracking area for the thread that is switched to, which has been recognized by the discrimination unit, after the current data have been sidetracked by the sidetracking processor.

Data processing device equipped with a thread switching circuit

An information processing system is provided that is capable of memory access suitable in any programming environment and which increases reliability by varying or restricting program access to memory areas. A number of data storage areas are established in memory that are equal to a number of declared object oriented array elements. Thereafter, memory is addressed using an index value of the indicated array element in the area where the data is stored. If, for example, an array object of a size corresponding to the total size of addresses in the memory is declared, the entire memory will be considered to be the data storage area. A program can then access a memory address by looking up a desired element.

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Kyoto-fu, Japan

Yosuke Baba