JPH05120038A - Interruption control system - Google Patents

Abstract

PURPOSE:To execute the process of high priority without returning control to the process in the middle of travel when interruption occurs while the process travels, an interruption processing is executed and the process of high priority can be made travel in the operating system of a multi-process. CONSTITUTION:When interruption occurs, the interruption processing is judged to be executed at present or not (step 1). If the interruption processing is not executed at present, the content of a register is saved in process management data on the process in the middle or travel (step 2). A processing corresponding to interruption is executed (step 3), and control is shifted to the head address of a dispatcher (step 4). When interruption terminates, a system is switched to the process of high priority at high speed without returning control to the process which is once interrupted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interrupt control system in a multi-process operating system (hereinafter referred to as "OS").

[0002]

2. Description of the Related Art In a conventional interrupt control method in an OS, when an interrupt occurs during process running, the state of the running process is saved in an interrupt stack, which is a state save area when the interrupt occurs, and when the interrupt processing is completed. The saved state was restored, and control was returned to the process that was running before the interrupt occurred.

[0003]

Here, an interrupt is, for example, reading a data block from a disk,
Or, it notifies the occurrence of an event such as the arrival of a message from the network, and the process is started or released in response to this. In a multi-process OS, a series of processes starts from the process with the highest priority triggered by an event.
At the time the event occurs, a process with a low priority is operating on average. In other words, when an event (interrupt) occurs, there is a high probability that a process with a higher priority will be switched. In the conventional interrupt control method, in this case, an asynchronous exception is sent to the interrupted process, control is returned to the interrupted process at the end of the interrupt, the process detects the exception, and passes control to the OS again to set the priority. I was switching to a higher process. An object of the present invention is to provide an interrupt control method that enables execution of a high-priority process without returning control to the running process when a process having a higher priority than the running process can run. To do.

[0004]

In order to achieve the above object, the interrupt control method according to the present invention is a multi-process operating system, and when an interrupt occurs during the process running, the status of the running process is displayed as process management data. It is composed of means for retreating inside and means for transferring control to the process switching processing when the interrupt processing is completed.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the drawings. FIG. 1 is a flow chart for explaining an embodiment of an interrupt control system according to the present invention. When an interrupt occurs in the OS while the process is running, it is determined whether or not the interrupt is currently being processed (step 1). If interrupt processing is not in progress, the contents of the register of the processor are saved in the process management data of the running process (step 2). Next, the process corresponding to the interrupt is performed (step 3), and the control is passed to the start address of the dispatcher (step 4). If the interrupt is being processed, the process register is saved in the interrupt stack (step 5). Then, the process corresponding to the interrupt is performed (step 6), and the control is transferred to the interrupted point (step 7).

[0006]

As described above, according to the present invention, in a multi-process operating system, when an interrupt occurs during process running, a means for saving the running process state in process management data, and the interrupt. Since it has means for transferring control to process switching processing when processing is completed, if a process with a higher priority than the running process can be run due to an interrupt, once the interrupt process is completed There is an effect that a high-priority process can be executed at high speed without returning control to the process.

[Brief description of drawings]

FIG. 1 is a flowchart for explaining an embodiment of an interrupt control system according to the present invention.

[Explanation of symbols]

1 ... Judgment step 2 ... Saving processing of register contents to process management data Step 3 ... Processing corresponding to interrupt 4 ... Control phase shift processing to dispatcher at the end of interrupt Step 5 ... Saving processing of register contents to interrupt stack Step 6 ... Processing step corresponding to interrupt 7 ... Control transfer processing step to interrupted point

Claims (1)

[Claims] 1. In a multi-process operating system, when an interrupt occurs while a process is running, a means for saving the status of the running process in process management data, and a process switching process when the interrupt process is completed. An interrupt control system characterized by comprising a means for transferring control.