Method for accessing shared memory

Abstract

The invention relates to a method for accessing a shared memory. The method comprises the following steps of: calling an access interface by a visitor; checking an authority registry by an authority checking program to check an interface authority for the visitor; if checking is passed, calling the interface and returning results and ending; if the checking is not passed, returning errors and ending. The patent of the invention ensures the safety and consistency of a shared memory data access by setting the visitor authority.

Description

technical field [0001] The invention relates to the field of shared memory processing, in particular to a method for accessing shared memory. Background technique [0002] Shared memory refers to a large-capacity memory that can be accessed by different central processing units (CPUs) in a multi-processor computer system. Shared memory is a communication method between multiple processes under Unix. This method is usually used for multi-process communication of a program. In fact, multiple programs can also pass information through shared memory. Since the shared memory can be accessed concurrently by multiple CPUs or multiple processes, but there is no permission control for the visitor, this will cause the visitor to have all the access rights, so that the access behavior of the visitor cannot be controlled, which is not conducive to the shared memory. The data in is protected. For example, data consistency issues arise. [0003] The traditional way to solve this kind o...

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Problems solved by technology

[0015] The present invention has several major defects in the shared memory access and its access protection measures, namely: no restriction on the authority of the visitor, which may easily lead to various data security and data consistency problems; the use of traditional lock protection mechanisms may easily cause access efficiency bottlenecks

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