Asynchronous output incoming signal processing method

Abstract

The invention discloses an asynchronous input and output signal processing method, which provides a set of event-based signal processing mechanism, and a particular design is made on an interface of the driving program to be matched with the set of signal processing. The invention comprises the following steps: step 1, a subscriber thread as a driving program user proposes the needs for conducting the input and output signal processing through the driving program interface; step 2, the driving program establishes an event example, which shall be exported to the subscriber thread; step 3, the subscriber thread obtains an input and output processing signals through the event example, and complete the relevant operation in accordance with the signal definition by the drive; the driving program completes the equipment input and output operation, and give public notice on subscriber thread processing signals through the event example. Some high-level synchronous mechanism are simplified, so as to be provided to the driving program designer for use; a subscriber thread can simultaneously conduct the asynchronous I / O operation with a plurality of equipment; and the driving program can automatically define the signal semantic meaning of the asynchronous I / O, thereby providing richer functions.

Description

technical field [0001] The invention relates to a signal transmission method, in particular to an input and output method when an application program uses a driver program to access an external device. Background technique [0002] Applications generally use drivers to access external devices, and currently drivers can provide two modes of operation: synchronous input and output (hereinafter referred to as synchronous I / O) and asynchronous input and output (hereinafter referred to as asynchronous I / O) . [0003] In synchronous I / O, a thread initiates an I / O operation and immediately enters a wait state until the I / O operation is complete before continuing. In the asynchronous I / O mode, the thread sends an I / O request to the kernel, and then continues to process other things. After the kernel completes the I / O request, it will notify the thread that the I / O operation is complete. The process is as figure 1 shown. [0004] In synchronous I / O, threads waiting for the I / O op...

AI Technical Summary

Problems solved by technology

In the Windows system, asynchronous I / O operations are implemented as a function of the file system, and various synchronization mechanisms in Windows can be used. This is a high-level signal processing behavior, but no suitable asynchronous operation was proposed when developing the driver. Signal Processing Model

On the other hand, in the traditional UNIX system, although asynchronous I / O based on the driver level is provided and a special signal is provided for it, there are many restrictions on this. For example, only stream devices can use asynchronous I / O. / O, only one such signal per process

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