JPH0244444A - Memory managing system - Google Patents

Abstract

PURPOSE:To prevent a system from being stopped due to abnormality by managing a direct address by a memory managing monitor, and making access to a memory via a monitor by informing an indirect address to a user. CONSTITUTION:When the memory managing monitor 2 provides a page correspondence null area managing table 8 to the user 1 for a memory acquiring request (1) from the user 1 and informs an area address to the user 1, the user 1 manages an informed indirect address. The user 1 informs the indirect address to the memory managing monitor 2 when write (2) on an area is generated, and the monitor performs the write by converting the address from the indirect address to the direct address. When a state impossible to make access by an access guard processing 10 due to the fact that a designated indirect address is a null area, etc., the abnormality is informed to the user 1. Even when read-in or reference is performed, the access is performed via the monitor by informing the indirect address to the memory managing monitor 2. In such a way, it is possible to prevent the system from being stopped due to the abnormality.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for managing memory work areas of fixed block length.

[Conventional technology]

Conventionally, a memory management monitor notifies a large number of memory users of a direct address provided by hardware, and each user directly accesses the notified memory.

[Problem to be solved by the invention]

The above-mentioned conventional memory management has the drawback that the management is entrusted to a large number of users using direct addresses, which can lead to system stoppage due to memory corruption or double opening.

[Means to solve the problem]

According to the present invention, in response to a memory reservation request, processing of allocating a free area and notifying an indirect address of the area, and writing, reading, and referencing to the allocated area are performed by specifying the indirect address notified at the time of allocation. processing; processing for connecting the area from an indirect address to a free chain and logically releasing it when a return request is made; and processing for guarding release requests and accesses to the free area using a management table for checking free areas; A memory management method is obtained which is characterized by having a process of guarding against accessing another block beyond the block length of a designated indirect address when accessing a memory area.

〔Example〕

Next, the present invention will be described in more detail with reference to the drawings showing one embodiment of the present invention.

Referring to FIG. 1, in one embodiment of the present invention, in response to the memory reservation request ■ from the user 1, the memory management monitor 2 issues the page-based free space management table 8 to the user 1 (memory reservation request). Processing 3). At this time, the user 1 is notified of the area address (page number and block number within the page). User 1 manages the notified indirect address.

When a write to the area occurs, user 1 notifies the memory management monitor of the indirect address (memory access processing 4), and monitor 2 converts the indirect address to a direct address (address conversion processing 6). If the specified indirect address to which writing is to be performed is in a state where it cannot be accessed due to an empty area or the like due to the access guard processing 10, the user 1 is notified of the abnormality.

For reading and reference, the indirect address is notified to the memory management monitor 2 and access is made through the monitor.

When a user returns the area they were using to the monitor■
, the indirect address is notified to the monitor, and the corresponding area on the free area management table is connected to the free chain 9 from the indirect address (memory release processing 5). Notify.

〔Effect of the invention〕

As explained above, according to the present invention, the memory management monitor manages addresses directly, notifies the user of indirect addresses, and accesses the memory via the monitor, thereby avoiding the troubles encountered in the past. It has the effect of preventing

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. 1... User, 2... Memory management monitor, 3...
Memory reservation processing, 4...Memory access processing, 5...
・Memory release processing, 6... Direct address ←→ indirect address conversion processing, 7... Memory area, 8... Free area management table for pages, 9... Management table for checking free areas, 10...・Access guard processing. Agent: Susumu Uchihara, patent attorney.

Claims (1)

[Scope of Claims] In response to a memory allocation request, a process of allocating a free area and notifying an indirect address of the area, and writing, reading, and referencing to the allocated area are performed by specifying the indirect address notified at the time of allocation. processing; processing for connecting the area from an indirect address to an empty chain and logically releasing it when a return request is made; processing for guarding a release request for and access to an empty area using a management table for checking an empty area; 1. A memory management system comprising: when accessing a memory area, guarding against accessing another block beyond the block length of a designated indirect address.