Timing method and device for semaphore waiting interface

Abstract

The invention discloses a semaphore waiting interface timing method and device. The method includes: step 1, when a predetermined task calls the semaphore waiting interface, enabling the hardware timer, setting the timing time of the hardware timer and the parameters of the semaphore waiting interface; step 2, obtaining the semaphore waiting interface through the semaphore waiting interface The semaphore, according to the value of the semaphore, judge whether the semaphore is a normal semaphore obtained before the timing time expires or an interrupt semaphore obtained after the hardware timer is interrupted; step 3, after judging that the obtained semaphore is a normal semaphore In this case, turn off the hardware timer, perform task processing according to the normal semaphore, and perform step 1. If the acquired semaphore is judged to be an interrupt semaphore, directly perform step 1. By means of the technical scheme of the invention, the timing accuracy of the semaphore waiting interface is improved.

Description

technical field [0001] The invention relates to the field of computers, in particular to a timing method and device for a semaphore waiting interface. Background technique [0002] The semaphore wait (pend) interface provided by the real-time operating system is an important strategy to realize the synchronous execution of multiple tasks. In the prior art, generally the interface has a time parameter, which indicates the length of time the interface waits for the semaphore, that is, if the semaphore does not arrive within the time length set by the time parameter, the interface will return a The return value of waiting for the semaphore to time out, wherein the behavior of judging whether to wait for the semaphore to time out needs to rely on the clock management system of the operating system itself. [0003] The current embedded operating system uses a fixed time slice method to maintain the clock of the operating system itself, and uses the hardware timer cycle on the ce...

AI Technical Summary

Problems solved by technology

[0011] The present invention provides a timing method and device for a semaphore waiting interface to solve the problem in the prior art that the timing accuracy of the semaphore waiting interface is low due to the limitation of the accuracy of the operating system clock itself

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