Synchronous method performing mutual exclusion access on shared resource, device and network equipment

Abstract

The invention provides a synchronous method performing mutual exclusion access on shared resource, a device and network equipment. The invention accesses the shared resource by introducing shared resource pointer variable, establishes a copy of the shared resource when performing writing on the shared resource to be specially used for resource update, uses two locks to respectively protect the shared resource pointer variable and the shared resource copy, simplifies the introduction of complex shared resource into introduction of pointer variable, thus reducing the complexity of critical region operation, improving the system performance, ensures plural readers and one writer to access the shared resource simultaneously, achieving the effect of self sole occupation of data, and enhancing the system concurrency rate to a great degree.

Description

technical field [0001] The invention relates to a synchronization method, device and network equipment for mutually exclusive access to shared resources, belonging to the technical field of data communication. Background technique [0002] Several concepts involved in the present invention are firstly explained below. [0003] Shared resource: refers to the data that multiple threads in the system will access; it is necessary to prevent concurrent access to shared resources, because if multiple execution threads access and manipulate data at the same time, it is possible for each thread to overwrite the shared data. Causes the accessed data to be in an inconsistent state. [0004] Competition condition: When the calculation result is completely dependent on how two or more threads are executed alternately, a competition condition is formed. For example, when multiple threads access shared resources concurrently, the operation result depends on the order in which the threads...

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Problems solved by technology

[0019] The above patents do not guarantee the data consistency between writers, and the restrictions used greatly restrict the scope of application of this method, especially the second Article, which almost limits the use of this technology only in some special cases, because the maximum access time of shared resources for read or write operations can only be determined in very few special cases, and if the time interval T is set too long , it will cause a waste of system resources

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