JPH02146651A - Input/output processor - Google Patents

Abstract

PURPOSE:To realize the highly efficient input/output operation by deciding whether the busy state release reports are received from all access routes or not and delaying the restart based on the deciding result. CONSTITUTION:A reception means 26 receives the busy state release reports at the time of receiving the busy state reports from all access routes 1001 - 1003, and a deciding means 27 decides whether the busy state release reports are received from all access routes 1001 - 1003 or not based on the control information. Based on this deciding result, a delay means 28 delays the restart of a restart means 25 by an extent enough to carry out the re-execution when the busy state release reports are received from all access routes. While the means 28 delays the restart of the means 25 by an extent enough for an input/ output device 30 to transmit the busy state release reports via the routes except some ones of them when the release reports are received from some of the access routes. Thus it is possible to prevent the second transmission of the busy state report when the input/output operation are carried out again to the device 30. Thus the highly efficient input/output operation are attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is applied to an input/output processing device of a data processing device. In particular, the present invention relates to a method for restarting an input/output processing device that selects an access route to an input/output device and executes an input/output operation when a busy status report is received during execution of an input/output operation.

〔overview〕

In an input/output processing device, the present invention manages the reception status of an in-use state release report when in-use state reports are received from all access routes, and, based on this management information, each time an in-use state release report is received. By determining whether or not the device has received information from all access routes and delaying the restart according to the result of this determination, it is possible to prevent the in-use status report from being sent again when re-executing the operation for the input/output device, and to improve efficiency. This allows for good input/output operations.

[Conventional technology]

Conventionally, when an input/output processing device selects an access route and performs an input/output operation with an input/output device, when the input/output device reports an in-use state, an in-use state cancellation report is sent in response to the in-use state report. The system was configured so that input/output operations with the input/output device were immediately restarted after receiving a report that the in-use state had been released.

[Problem that the invention seeks to solve]

However, in such conventional input/output processing devices, the input/output device is controlled to immediately restart the input/output operation without any conscious delay after receiving a notification that the in-use state has been released. Depending on the type, when restarting the input/output operation after reporting the release of the in-use state, the in-use state may be reported again without canceling the processing power that can be re-executed after reporting the release of the in-use state in the input/output device. There was a drawback that efficient input/output operations were not performed.

The present invention solves the above-mentioned drawbacks, and is an input/output processing device that can prevent the in-use status from being reported again when re-executing the input/output operation for the input/output device, and can perform the input/output operation efficiently. The purpose is to provide

[Failure to solve the problem]

The present invention provides a means for selecting a plurality of access routes and executing an input/output operation based on an input/output operation instruction from a central processing unit, and a means for executing an input/output operation by selecting a plurality of access routes based on an input/output operation instruction from a central processing unit, and a means for executing the input/output operation when a busy status report is received from all of the access routes. a means for restarting the means, and suspending the restart of the means for restarting the means for a period of time after receiving in-use status reports from all of the access routes until receiving an in-use status release report from one of the access routes; means for receiving an in-use state cancellation report after receiving in-use state reports from all of the above-mentioned access routes; and a means for receiving an in-use state release report based on management information of the receiving means. It is characterized by comprising means for determining whether or not reports have been received from all of the access routes each time a report is received, and means for delaying the restart of the restarting means based on the determination result of the determining means. shall be.

[Effect]

The receiving means receives an in-use state release report when in-use state reports are received from all access routes. The determining means determines, based on the management information of the receiving means, whether the in-use state cancellation report is received from all access routes. The means for delaying is based on the determination result of the means for determining, and delays the restart of the means for a sufficient time to re-execute when received from all of the access routes, and when received from some of the access routes. Sometimes, the input/output device is delayed for a sufficient period of time to send the busy state release report from other access paths. This operation prevents the in-use status report from being sent again when re-executing the input/output operation for the input/output device, making it possible to perform the input/output operation with high efficiency.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram of an input/output processing device according to an embodiment of the present invention. In FIG. 1, the input/output processing device includes a route selection unit 21 and an execution requesting unit as means for selecting a plurality of access routes 1001 to 1003 and executing input/output operations based on input/output operation instructions from the central processing unit 10. 22 and execution means 23; restart means 25 as a means for restarting the execution means when in-use status reports are received from all of the access routes 100; and access route 100.
A restart suspending means 24 is provided as a means for suspending the restart of the restarting means 25 for a period of time after receiving the in-use state report from all of the access routes 100 until receiving the in-use state cancellation report from one of the access routes 100.

Here, the feature of the present invention is that the access route 10
management means 26 as a means for receiving an in-use state release report after receiving an in-use state report from all of A determining means 27 is included as a means for determining whether or not the restarting means 25 has been restarted based on the determination result of the determining means 27.

The operation of the input/output processing device having such a configuration will be explained. FIG. 2 is a flowchart illustrating the operation of the input/output processing device of the present invention. FIG. 3 is a diagram illustrating the operation of the input/output processing device of the present invention. In FIG. 1, the delay means 28 has a delay time t1 if it receives an in-use state cancellation report from all the access routes 100 for which the in-use state report has been received by the determination means 27, or a delay time t2 if it does not receive an in-use state release report. Determine. During the delay time t1, all the access routes 1 made by the input/output device 30 in the in-use status report are
A time is set in advance that is necessary and sufficient to exceed the time during which the in-use state is canceled after reporting to 00 that the in-use state is canceled due to subsequent processing, etc., and the input/output device 30
When reporting the release of the in-use state to multiple access routes 100, the time required from reporting the release of the in-use state to one access route 100 to reporting the release of the in-use state to the other access route 100 is A time that exceeds the necessary and sufficient time is set in advance. Therefore, delay time 1. <Delay time t2 is desirable.

1 to 3, when the central processing unit 10 now issues an input/output operation instruction to the input/output processing unit 20, the input/output processing unit 20 uses a plurality of access paths 100 to the input/output device 30. ．． To select an access route to be used for input/output operations from 1003, here, access route 10 is selected.
0. Suppose you select >(S 1).

Request the input/output device 30 to perform an input/output operation (S2)
. Here, the input/output processing device 20 executes the input/output operation unless it receives a usage status report from the input/output device 30 (
S3, S5), upon receiving the in-use status report, if there is another usable access route 100, select it (in this case, access route 1002.1003) (S4), and similarly perform input/output operations to the input/output device 30. Request execution of (Sl)
.

When the in-use state reports are received from all the available access routes 100 (S4), the input/output processing device 20 is activated by the restart suspension means 24 until the in-use state cancellation report is received from the input/output device 30. The request to perform the input/output operation is put on hold (S6). Next, when the input/output device 30 reports an in-use status release report via the access route 100, the determining unit 27 determines from the information of the management unit 26 that no in-use status release report has been received from the access route 1002 or 1003 yet. and it is decided to suspend the execution request for the next input/output operation for a delay time t2 (S7, S9.510
). Here, during the delay time t2, the access route 1002.
If there is an in-use status cancellation report from 1003, the management means 26
When the in-use state report is received, the determining means 27 determines that the in-use state release report has been received from all the access routes 100, and after the delay means 28 delays the delay time t1, the restart means 25 executes the input/output operation. Attempt to make a request (S7, S8, Figure 3).

Furthermore, if the in-use state cancellation report from the access route 1002 or 1003 is not reported during the delay time t2 for some reason, the restart means 25 requests execution of the input/output operation (FIG. 4). .

Here, in this embodiment, the restart unit 25 is configured to be restarted by the delay unit 28 after the hold is released, but the delay unit 28 may also delay the release of the hold of the restart hold unit.

〔Effect of the invention〕

As explained above, the present invention has the excellent effect of being able to prevent the in-use status from being reported again when re-executing the input/output operation to the input/output device, and enabling efficient execution of the input/output operation. There is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an input/output processing device according to an embodiment of the present invention. FIG. 2 is a flowchart showing the operation of the input/output processing device of the present invention. FIG. 3 is a diagram explaining the operation of the input/output processing device of the present invention. 10... central processing unit, 20... input/output processing unit,
21. Route selection means, 22... Execution request means, 23.
...Execution means, 24...Restart pending means, 25...
Restart means, 26... Management means, 27... Determination means, 28... Delay means, 30... Input/output device, 100
1 to 1003...Access route, tl, t2...Delay time.

Claims (1)

[Scope of Claims] 1. Means for selecting a plurality of access routes and executing an input/output operation based on an input/output operation instruction from a central processing unit, and a case in which in-use status reports are received from all of the access routes. a means for restarting the means for executing the above, and a means for restarting the means for restarting the above-mentioned restarting means for a period from receiving the in-use state report from all of the above-mentioned access routes until receiving the in-use state release report from one of the above-mentioned access routes. In the input/output processing device, the input/output processing device is equipped with a means for suspending activation, a means for receiving an in-use state release report after receiving in-use state reports from all of the above access routes, and a means for receiving an in-use state release report based on management information of the receiving means. The device includes means for determining whether or not the report has been received from all of the access routes each time an in-use state release report is received, and means for delaying the restart of the restarting means based on the determination result of the determining means. An input/output processing device characterized by: