摘要:
A computer system including a plurality of shared resources to be used exclusively by a plurality of tasks. Upon occurrence of an interrupt, execution of the task running at that time is suspended to allow the interrupt task to be executed. After execution of the interrupt task, one of the tasks remaining in the execution waiting state is selected for execution. A method of scheduling tasks with priority to the task locking a shared resource includes the steps of registering a task identifier of a task being executed upon locking of the task to a resource, invalidating the registered identifier of the task when that task releases the shared resource from the locked state, deciding whether or not a valid task identifier representing the task which was running by locking the shared resource is registered when a task to be executed next is to be selected after execution of the interrupt task, and selecting the task designated by the task identifier, if registered, to thereby select the task as the one to be executed with priority.
摘要:
In a composite subsystem having a plurality of data base systems and data communication on a plurality of processors, a composite subsystem controller unifies other data base systems of the composite subsystem and distributed data base systems, and, at the occurrence of a fault in some subsystem, allows other subsystems to operate continuously, thereby facilitating the recovery after the faulty subsystem has started up, and makes management as to which data base system a transaction in execution has accessed so that the range of failure is confined, thereby facilitating the fault recovery. The check points of two processings including updating of information in the memory and accumulation of the updated information in the journal are detected so that the need of journals earlier than the check point is eliminated, and a check point dump is acquired without waiting for the end of transaction which has been active at the check point.
摘要:
Task execution control for a multiprocessor wherein at a time point when a post issue task ends the use of a shared resource, the shared resource is released, another task which is running on another processor is allowed to lock the shared resource, and thereafter the task is made ready. After that, the post procedure is initiated, and thereafter through the high-speed dispatch procedure, the processor is granted first to a task which has failed to lock the shared resource, and the task is prompted to retry to lock the shared resource.
摘要:
A database system includes a database unit for storing a database, a managing processor and a processor. The managing processor manages the database unit and accesses the database unit in response to an inputted particular request. The processor internally generates a request in accordance with a user program, directly accesses the database unit in accordance with the generated request when the generated request is one of first predetermined requests, and outputs the generated request to the managing processor as a particular request when the generated request is one of second predetermined requests. Each of the second predetermined requests incurs a change in contents of the database, and the managing processor updates a log stored in a log unit in accordance with processing for the particular request.
摘要:
In a composite system in which a plurality of data base systems and data communication are treated as respective subsystems. At the occurrence of a fault in one subsystem, other subsystems are allowed to operate continuously, thereby facilitating recovery after a faulty subsystem has started up. A controller performs as to which data base system a transaction in execution has accessed so that the range of failure is confined, thereby facilitating the fault recovery. The check points of two processings including updating of information in the memory and accumulation of the updated information in the journal are detected so that the need of journals for information occurring earlier than the check point is eliminated, and a check point dump is acquired without waiting for the end of a transaction which has been active at the check point.
摘要:
A multiple processor system composed of a plurality of instruction processors allows a plurality of its subsystems for performing data processing in each unit to be operable simultaneously with and parallel to each other in each of the instruction processors. The multiple processor system has a processor designation table and a control processing subsystem. As the processor designation table specifies correspondence relation between a subsystem accessing to each input-output resource and the instruction processor executing the subsystem, the processing control subsystem transfers control of the processing to the instruction processor to be designated by the processor designation table in accordance with the subsystem to be used with reference to the processor designation table during execution of the data processing.
摘要:
One of a radiator plate (21) and a globe cover (13) is provided, on a part which makes contact with the other one, with a plurality of cutout sections (41), and the other one is provided, at positions corresponding to the respective cutout sections (41), with a plurality of projections (31). By engaging the cutout sections (41) and the projections (31), the globe cover (13) is attached to the radiator plate (21). This makes it possible to prevent, for a long term, the globe cover (13) which encloses a light source so as to cover the light source from being detached.
摘要:
A lighting apparatus includes a light source, a power supply circuit supplying power to the light source, a heat radiating section made of electrical insulating material and radiating heat from the power supply circuit to outside air, and a heat conducting section conducting heat from the power supply circuit to the heat radiating section, and the heat radiating section and the heat conducting section are thermally connected. A weight reduction of the lighting apparatus is realized and a heat conduction from the heat conducting section to the heat radiating section is improved.
摘要:
The lighting apparatus according to the present invention includes a thermal source such as a light source or a power supply unit and a heat releasing portion for releasing heat from the thermal source, and further includes the first heat radiation film formed by applying a coating material containing a heat radiating material on the surface of the heat releasing portion and curing the material. Since the first heat radiation film is formed by curing the material containing a heat radiating material, heat emittance by infrared is improved compared to the case with a heat radiation film formed by anode oxide coating (alumite treatment), thereby enhancing the heat releasing performance while maintaining the heat releasing performance by heat radiation for a long period of time because of the high resistance to damages.
摘要:
A lever-type connector includes a connector housing, a cover attached to the connector housing, a lever rotatably mounted on the connector housing. The lever is rotated in a situation that a mating connector is fitted to the connector housing in a half-fitted condition, thereby moving the mating connector with respect to the connector housing from the half-fitting condition to a completely fitting condition. A retaining portion is provided on the lever. A lock portion provided on the cover is engaged with the retaining portion when the lever has been rotated. A lever claw portion is provided on the retaining portion. The lock portion is provided on a distal end portion of the lock arm. A lock protection portion is provided on the retaining portion so as to be positioned away from a rotation center of the lever than the lever claw portion so that the lock protection portion covers the lock portion.