Method for processing asynchronous input/output signal

Abstract

The invention discloses an asynchronous input and output signal processing method, provides a set of event-based signal processing mechanism, and makes a special design on the interface of the driver program to cooperate with this set of signal processing, including the following steps: Step 1, as a driver program The user thread of the user puts forward the need for input and output signal processing through the driver interface; step 2, the driver creates an event object and exports it to the user thread; step 3, the user thread obtains the input and output processing signal through the event object, And complete the corresponding operation according to the definition of the signal by the driver; the driver completes the input and output operations of the device, and notifies the user thread to process the signal through the event object. Simplify some advanced synchronization mechanisms and provide them to driver designers; a user thread can perform asynchronous I / O operations with multiple devices at the same time; drivers can customize the signal semantics of asynchronous I / O to provide 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 completed. This process is as figure 1 shown. [0004] In synchronous I / O, threads waiting for the I / O ...

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

Images