JPH02138632A - Information saving/restoring system - Google Patents

Abstract

PURPOSE:To shorten the information saving/restoring time when an interruption process is carried out by saving all information only when it is required to execute a task produced through the interruption process with preference. CONSTITUTION:An execution control part start means 200 checks whether or not a preferential task production information setting means 102 set the preferential task production information when an interruption process part 100 completes an interruption process. When it is confirmed that the preferential task production information is set, an execution control part 300 is started. A full saving means 301 saves all information set in an information process system before the part 300 starts to execute a new task. Thus it is possible to save and restore the information at occurrence of an interruption without deteriorating the response of the information process system.

Description

[Detailed Description of the Invention] [Summary] Regarding the improvement of the information saving and restoring method in an information processing system equipped with an interrupt processing function, an information processing system that is strongly required to have high information processing ability and real-time performance. The purpose is to make it possible to save and restore information in the event of an interrupt without degrading the response of the system.It is equipped with an interrupt processing unit for each of multiple interrupt factors, and also controls the execution order of multiple tasks. In an information processing system that includes an execution control unit that performs control based on priority, when starting interrupt processing, each interrupt processing unit receives information that is set in the information processing system by the task to be interrupted. A partial save/restore means for saving only a predetermined part of information and restoring the part of the information being saved when finishing the interrupt process; a priority task generation information setting means for setting priority task generation information indicating that a task with a higher priority than the task has been generated; Analyzes whether or not has set priority task generation information,
The information processing system is provided with an execution control unit activation means that activates the execution control unit when it is identified that priority task generation information has been set, and the execution control unit is configured to generate information before starting execution of a new task. The processing system is configured to have a total saving means for saving all the information being set.

[Industrial Application Field] The present invention relates to an improvement of an information saving/restoring method in an information processing system having an interrupt processing function.

In an information processing system that executes processing units called multiple tasks in an execution order according to the priority given to each task, when a task with a higher priority than the currently executing task occurs, the currently executing task Interrupt processing is used to temporarily suspend a task, execute a high-priority task, and then resume execution of the suspended task.

When interrupt processing is completed, in order to be able to resume execution of the interrupted task from the point of interruption, the information set in the information processing system at the time of interruption is saved and retained, and the point at which execution is resumed. It is then required to restore the data into the information processing system again.

[Conventional technology]

FIG. 7 is a diagram showing an example of a conventional information processing system, and FIG. 8 is a diagram illustrating a conventional interrupt processing process.

In FIG. 7, the information processing system includes a processor 1 and a memory 2.

The processor 1 includes control registers 111 to 11m and general-purpose registers 121 to 12n that store various information necessary for executing each task.

Part of the memory 2 contains processing programs P and Pb executed by the processor 1, an execution control program P6 executed by the processor 1 to control the execution order of each task based on priority, and interrupt factors. In order to cause the processor 1 to execute interrupt processing corresponding to k types of interrupt processing programs Pit to Pik corresponding to k types of interrupt causes,
are stored in the control registers 111 to 11m and general registers 121 to 12m during interrupt processing.
Evacuation areas 211 to 21m and evacuation areas 221 to 22n are provided for evacuating the accumulated contents of n.

In FIGS. 7 and 8, when an interrupt occurs due to the following causes while the processor 1 is executing information processing by the processing program P, the processor 1 temporarily suspends the task being executed and analyzes the cause of the interrupt. , interrupt processing program Pix corresponding to the interrupt factor (where X is 1 to 1)
Start execution.

The processor 1 that starts executing the interrupt processing program pix first stores all the control registers 111 at the time of interruption.
The accumulated contents of all the general registers 121 to 11m are saved to the save areas 211 to 21m in the memory 2, and the accumulated contents of all general-purpose registers 121 to 12n at the time of interruption are saved to the save areas 221 to 22n in the memory 2 (8th Figure step Sl
).

In addition, the evacuation areas 211 to 21m and 221 to 22n
A plurality of sets are provided corresponding to the tasks.

Next, the processor 1 that executes the interrupt processing program p ix analyzes the interrupt (step S2), and then executes the interrupt processing by the interrupt processing program p ix (
Step S3).

In the interrupt processing by the interrupt processing programs P and X, when information processing by the processing program P is requested, the processor l generates a task necessary for the information processing.

When the required interrupt processing is completed, the interrupt processing program P
The processor 1 that executes iX runs the execution control program P4.
, and a task to be executed subsequently is selected (step S4).

[Problem to be solved by the invention]

As is clear from the above explanation, in a conventional information processing system, the processor 1 executes the interrupt processing program Pix corresponding to the interrupt cause, so that when the interrupted task is interrupted, all control registers are 111 to 11
Since the contents accumulated in m and general-purpose registers 121 to 12n were unconditionally saved to save areas 211 to 21m and 221 to 22n, the information processing capacity is reduced in an information processing system where interrupts occur frequently. In addition, in information processing systems such as exchange processing systems that strongly require real-time performance, there is a risk that real-time performance may deteriorate.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to save and restore information in the event of an interrupt without deteriorating the information processing capacity of an information processing system and the response of an information processing system that is strongly required to be real-time.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, reference numeral 100 denotes an interrupt processing unit 30 that the information processing system includes in response to a plurality of interrupt factors.
0 is an execution control unit included in the information processing system to control the execution order of a plurality of tasks based on priorities.

Reference numeral 101 denotes a partial save/restore means provided in each interrupt processing section 100 according to the present invention.

Reference numeral 102 denotes priority task generation information setting means provided in each interrupt processing section 100 according to the present invention.

Reference numeral 200 denotes execution control unit starting means provided in the information processing system according to the present invention.

Reference numeral 301 denotes a total saving means provided in the execution control unit 300 according to the present invention.

[Effect]

Even when the information processing system executes interrupt processing, only part of the information set in the information processing system by the interrupted task is destroyed, and the remaining information is retained without being destroyed.

The present invention aims to speed up information saving and restoring processing by utilizing such characteristics.

The partial save/restore means 101 saves only a predetermined part of the information set in the information processing system by the interrupted task when each interrupt processing unit 100 starts interrupt processing. When interrupt processing is finished, some of the information being saved is restored.

The priority task generation information setting unit 102 sets priority task generation information indicating that a task with a higher priority than the interrupted task was generated during execution of the interrupt process.

The execution control unit starting means 200 activates the priority task generation information setting means 10 when the interrupt processing unit 100 finishes interrupt processing.
2 analyzes whether or not priority task generation information has been set, and when it is identified that priority task generation information has been set, the execution control unit 300 is activated.

The total saving means 301 saves all information currently being set in the information processing system 1, before the execution control unit 300 starts executing a new task.

Therefore, each interrupt processing section saves only a predetermined part of the information when starting the interrupt processing, and restores the saved part of the information when finishing the interrupt processing. However, when a task generated as a result of interrupt processing needs to be executed with priority, all information is saved for the first time, reducing the time required to save and restore information associated with interrupt processing. This prevents a decrease in the processing capacity of the information processing system and a decrease in real-time performance in an information processing system that is strongly required to have real-time performance.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing an information processing system according to an embodiment of the present invention, FIG. 3 is a diagram illustrating the interrupt processing process in FIG. 2, and FIG. 5 is a diagram illustrating an analysis process, FIG. 5 is a diagram illustrating an execution control process in FIG. 2, and FIG. 6 is a diagram illustrating a suspended state word according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 2, as the interrupt processing unit 100 in FIG. 1, a processor executes interrupt processing programs Pil" to p, kl corresponding to each interrupt cause,
The interrupt processing process as shown in FIG. 3 is realized, steps Sll and Si2 in FIG. 3 correspond to the partial save/restore means 101 in FIG. 1, and the priority task generation information setting means 102 in FIG. Steps S14 and 517 in FIG. 3 correspond to steps S14 and 517 in FIG. 3, and a suspension state word register 131 for storing a suspension state word W as the execution control unit starting means 200 in FIG. 1, and a suspension state word analysis process as shown in FIG. An interruption state word analysis unit 132 that executes step S31 in FIG. It is provided within Pd'.

In FIGS. 2 to 6, when an interrupt occurs due to the following causes while processor l is executing information processing by processing program P, processor l temporarily suspends the task being executed and analyzes the cause of the interrupt. , starts execution of the interrupt processing program Pix' corresponding to the interrupt factor.

The processor 1 that has started executing the interrupt processing programs p and Xl saves some general-purpose registers 121 to 12j (however, j is 1 to n) are stored in the interrupted save areas 221 to 22j in the memory 2.
(Step 5ll in FIG. 3).

Next, the processor l that executes the interrupt processing programs P and X' analyzes the interrupt (step 512), and then
Interrupt processing by the interrupt processing programs p and Xl is executed (step 513).

In the interrupt processing by the interrupt processing program P iX, when information processing by the processing program P is requested, the processor 1 generates a task necessary for the information processing.

Next, the processor 1 executing the interrupt processing program Pixo determines whether or not a task with a higher priority than the interrupted task is generated as a result of the interrupt processing in step S13 (step 514). If a task with a higher priority than the task has not been generated, step S
The accumulated contents saved in the save areas 211 to 21j in step 515) are restored to the control registers 111 to 11j, and the interrupted task is returned to the interruption point (step 515).
step 816).

Note that in step S14, when a task with a higher priority than the interrupted task is generated, priority task generation information Z is set to a code indicating the generated state in the suspended state word W as shown in FIG. After accumulating in the suspended state word register 131 (step SL?), steps S15 and S16 are executed.

As a result of the above, the general-purpose registers 121 to 12n in the processor 1 are restored with the stored contents at the time of interruption of the interrupted task, and the control registers 111 to 11m are stored with the same contents as at the time of interruption of the interrupted task. This means that it continued to be held.

When the processor 1 executing the interrupt processing programs p and X+ returns to the interruption point, it starts the interruption state word analysis section 132.

The activated suspended state word analysis unit 132 analyzes the suspended state word W stored in the suspended state word register 131 (step 521 in FIG. 4), and identifies that the priority task generation information Z is not set to the generated state. (Step 5)
22), processor 1 resumes execution of the interrupted task from the interrupted point (step 523).

As a result of the analysis of the suspended state word W by the partially suspended state word analysis unit 132 (step 521), if it is identified that the priority task generation information 2 is set to the created state (step 5
22), the processor l starts executing the execution control programs p and l and selects the task to be executed (step 5).
24).

The processor 1 first executes an execution control program P.

By executing the save part P (Is in The contents are saved to the save areas 221 to 22n in the memory 2 (step 53 in FIG. 5).
1).

Subsequently, the processor 1 that executes the execution control program Pd° selects a new task to be executed (step 532).

As a result of the selection, the task generated as a result of the interrupt processing is selected and executed with priority over the interrupted task.

Next, the processor 1 executing the execution control program Pd sets the information of the selected task in the control registers 111 to 11m and the general registers 121 to 12n (step 533), and starts executing the selected task (step 534). .

When the higher-priority task finishes executing, the processor 1 executing the execution control program P,'' repeats steps 332 and subsequent steps, thereby restarting execution of the interrupted task from the interrupted point.

As is clear from the above description, according to this embodiment, the processor 1 that has started executing the interrupt processing program After saving the stored contents of only some of the general-purpose registers 121 to 12j, and completing the required interrupt processing, the general-purpose registers 121 to 12j are saved again.
The execution control program P, °
Evacuation part P inside. Since the processor l that executes saves the accumulated contents of all the control registers 111 to 11m, the amount of information to be saved and restored becomes the minimum necessary, and the time required for saving and restoring information is also shortened.

Note that FIGS. 2 to 6 are only one embodiment of the present invention, and for example, the partial save/restore means 101, the priority task generation information setting means 102, the execution control unit starting means 200, and the total saving means 301 are shown in FIGS. Although the present invention is not limited to what is shown in the drawings and many other modifications may be considered, the effects of the present invention remain the same in any case. Furthermore, it goes without saying that the information processing system to which the present invention is applied is not limited to what is illustrated.

〔Effect of the invention〕

As described above, according to the present invention, in the information processing system, each interrupt processing section saves only a predetermined part of information when starting interrupt processing, and also ends the interrupt processing. When it becomes necessary to restore some of the saved information and give priority to the task generated as a result of interrupt processing, it is necessary to save all the information for the first time, so The time required to save and restore accompanying information is shortened, and a decline in the processing capacity of the information processing system and a decline in real-time performance in an information processing system that is strongly required to be real-time performance are prevented.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing an information processing system according to an embodiment of the present invention, FIG. 3 is a diagram illustrating the interrupt processing process in FIG. 2, and FIG. is a diagram illustrating the interrupted state word analysis process in Figure 2;
6 is a diagram illustrating an execution control process according to an embodiment of the present invention, FIG. 7 is a diagram illustrating an example of a conventional information processing system, and FIG. 8 is a diagram illustrating a conventional FIG. In the figure, 1 is a processor, 2 is a memory, 100 is an interrupt processing unit, 101 is a partial save/restore means, 102 is a priority task generation information setting means, 111 to 11m are control registers, 121 to 12n are general-purpose registers, 131 132 is an interruption state word register; 200 is an execution control unit starting means; 201.211 to 21m;
221 to 22n are save areas, 300 is an execution control unit, 3
01 is from Mokura on August 1; Yoroina Seimatasu Sato system! 2 Fig. Fig. Urushi e Month 1 Boro Medium 1 Mo. 11th word calculation 6 Whistle 2 times 12 δ1 Processing process to Broken 3 Fig. Coated axis board Aro + [[Processing system\ 7 Fig.

Claims (1)

[Claims] Each interrupt processing unit (100
) and an execution control unit (300) that controls the execution order of a plurality of tasks based on priorities, the information processing system having each of the interrupt processing units (100) start interrupt processing. At this time, the interrupted task saves only a predetermined part of the information set in the information processing system, and when the interrupt processing ends, the part of the information being saved is saved. Partial save/restore means to restore information (1)
01), and priority task generation information setting means (102) for setting priority task generation information indicating that a task with a higher priority than the interrupted task was generated during execution of the interrupt process, When the interrupt processing unit (100) finishes the interrupt processing, the priority task generation information setting means (102) analyzes whether or not the priority task generation information has been set, and determines whether the priority task generation information has been set. The information processing system is provided with an execution control unit activating means (200) for activating the execution control unit (300) when the execution control unit (300) is identified as having been executed, and the execution control unit (300) is provided with: An information saving/restoring method characterized in that a total saving means (301) is provided for saving all the information being set in the information processing system before setting the information.