Shared resource access method and device

Abstract

The embodiment of the invention provides a shared resource access method and device, and the method comprises the steps: setting the upper limit priority of a shared resource to be higher than or equal to the highest priority of a resource use unit for accessing the shared resource, wherein the resource use unit comprises a task and/or interruption; when a certain resource using unit calls the shared resources, adjusting the priority of the resource using unit to the upper limit priority, then obtaining the shared resources through a resource obtaining statement, and releasing the shared resources through a resource releasing statement. According to the shared resource access method and device, theupper limit priority of the shared resources is set to be higher than or equal to the highestpriority of the resource use units accessing the shared resources, and when a certain resource use unit calls the shared resources, the priority of the resource use units is adjusted to the upper limit priority, so that the priority inversion minimization is realized, and the deadlock phenomenon is avoided.

Description

technical field [0001] The present invention relates to the field of computer technology, in particular to a method and device for accessing shared resources. Background technique [0002] In a computer system, some computer resources, such as hardware or memory, can be accessed concurrently by multiple tasks and / or ISRs (Interrupt Service Routines, Interrupt Service Routines) with different priorities. Such computer resources are called shared resources. [0003] Access to shared resources is often considered unreliable and insecure, and typical problems related to shared resource access include priority inversion (Priority Inversion) and deadlock (Deadlock) problems. [0004] The so-called priority inversion (also called priority inversion) means that a high-priority task is blocked by a low-priority task, so that the relative priorities of the two tasks are inverted. For example, a high-priority task is waiting to access a shared resource that is being used by a low-pri...

AI Technical Summary

Problems solved by technology

For example, in the previous example, a high-priority task was waiting to access a shared resource that was being used by a low-priority task, but the low-priority task was repeatedly occupied by other tasks with higher priority while occupying the shared resource. Preemption, so that the blocking suffered by high-priority tasks may be infinite

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