JPH05120237A - Data communication system between information processors - Google Patents

Abstract

PURPOSE:To improve the total throughput by successively sending a next request to an opposite device without waiting for the processing result of a previous request, and obtaining its processing result without reference to order. CONSTITUTION:Request information entries 5, 6, and 7 are provided with a process ID recording area M2 wherein the process IDs of user processes 2 and 3 making process requests are recorded and a request state recording area M1 wherein the process states of the requests are recorded, and an input/output part 4 is provided with a request quantity counter 8 which counts requests for writing to a shared memory 11; and a means which mutually informs the 1st and 2nd information processors 1 and 10 of the process IDs recorded in the process ID recording area M2 when data are transferred between 1st and 2nd information processors 1 and 10 is provided, and the contents of the request state recording area M1 and the value of the request quantity counter 8 are referred to, thereby sending out data of the process requests from the user processes 2 and 3 to the 2nd information processor 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication system between two closely coupled processing units used for information processing, and more particularly to a data communication system between information processing units for managing a shared memory.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram of an information processing apparatus for explaining a conventionally known data communication system. In this figure, the first information processing device 21 includes one or more user processes 22, 23, an input / output unit 24 having a request queue 25 and request information entries 26, 27, 28, and a control unit 29. The second information processing device 30 is the shared memory 3
1 and a processing unit 32. In this data communication system, the first information processing device 21 to the second information processing device 3
A request is sent to 0, and the result is obtained by the first information processing device 21. The input / output unit 24 in the first information processing apparatus 21 generally forms a part of the operating system and includes a request queue 25 having pointers at the beginning and the end of the entry. Therefore, when a request is issued from the user processes 22 and 23, information such as a buffer position where the request content and the result should be written is written into the request information entries 26, 27 and 28 via the request queue 25. On the other hand, the shared memory 31 of the second information processing apparatus may physically exist in either the first or second information processing apparatus 21, 30. The information processing devices 21 and 30 can be accessed respectively. The shared memory 31 is divided according to the directionality of data. That is, the write-only area by the first information processing apparatus 21 is a read-only area from the second information processing apparatus 30, and conversely, the read-only area by the first information processing apparatus 21 is the second information processing apparatus 30. Then, it becomes a write-only area. The processing unit 32 provided in the second information processing apparatus 30 performs processing based on the request content of the first information processing apparatus 21.

Next, a procedure for exchanging data (request and its result) via the shared memory 31 between the first and second information processing devices 21 and 30 configured as described above is shown in FIG. A description will be given with reference to the flow chart. First, the request information entry 2 connected to the request queue 25 of the input / output unit 24
The contents of 6, 27, and 28 are shared by the shared memory 3 via the control unit 29.
When the data take-up request interrupt occurs, the request source user processes 22 and 23 enter a waiting state (steps U1 and U2). When the processing unit 32 of the second information processing device 30 receives this data take-back request interrupt, it takes in data (request) from the shared memory 31 and generates a data take-over completion interrupt (steps U3 to U).
4). After the processing unit 32 further performs the processing, the data corresponding to the processing result is written in the shared memory 31, and the data take-back request interrupt is generated (steps U5 to U).
6). The first information processing device 21 that has received the data take-back request interrupt receives the data (processing result) via the control unit 29, and stores the request information in the request information entries 26, 27, 28 connected to the request queue 25. Based on the information, this data (processing result) is written in the writing position of the user processes 22 and 23 (step U7). After that, by generating a data collection completion interrupt and releasing the request information entries 26, 27, 28 connected to the request queue 25,
The user processes 22 and 23 in the waiting state are activated (step U8). Through this series of processing, the user processes 22 and 2 that issued the request to the second information processing apparatus 30.
3 can obtain the result.

[0004]

In the above-described conventional data communication system between information processing devices, when a user process issues a request and waits while another user process issues another request. , The request is stored in the request queue 25 of the first information processing apparatus 21, and is in a waiting state until the result is returned to the user process that issued the previous request. Therefore, when the second information processing device 30 having the shared memory 31 requires a long time for a part of the request processing, there is a problem that the processing efficiency is significantly reduced.

The present invention has been proposed in order to solve the problems of the prior art as described above, and continuously waits for the next request to the information processing device of the other party without waiting for the processing result of the previous request. It is an object of the present invention to provide a data communication system between information processing devices, which can improve the overall processing efficiency by allowing the data to be sent in the same order and obtaining the processing results in random order.

[0006]

To achieve this object, the present invention comprises a plurality of user processes and
Data communication is performed between a first information processing device having a plurality of request information entries in the input / output unit and a second information processing device having a shared memory and a processing unit, and data of a processing request from a user process. Is written to the shared memory via the request information entry, and then fetched and processed by the processing unit of the second information processing apparatus, and the result information is written to the shared memory. In the data communication method between the information processing devices which is returned to the user process of the first information processing device via the user requesting the process in the request information entry provided in the input / output unit of the first information processing device. A process ID recording area for recording the process ID of a process, whether or not at least this request information entry is unused, and a process for request processing from a user process. A request status recording area for recording a processing status of a request as to whether or not the data is in a waiting state before being fetched by the second information processing apparatus side, and is counted up when a processing request is made from a user process. ,
The input / output unit is provided with a request number counter for storing the number of write requests to the shared memory, which is counted down after the data of the process request from the user process is fetched by the second information processing apparatus side. When exchanging data between the two information processing devices, it has means for notifying each other of the process ID recorded in the process ID recording area, and refers to the contents of the request state recording area and the value of the request number counter. The processing request data from the user process is sent to the second information processing apparatus.

[0007]

According to the above configuration, the process ID can be notified between the information processing devices, and the data can be sent to the second information processing device by referring to the content of the request status recording area and the value of the request number counter. The request data can be continuously sent to the second information processing apparatus without waiting for the processing result for the request, and the processing result data can be returned to the first information processing apparatus in any order.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of a data communication system between information processing apparatuses according to the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a block diagram of an information processing apparatus that realizes this data communication method. In this figure, the first information processing apparatus 1 has user processes 2, 3 and request information entries 5, 6, 7
The second information processing apparatus 10 includes the input / output unit 4 having the request number counter 8 and the control unit 8, and the second information processing apparatus 10 includes the shared memory 9 and the processing unit 12. A request processing state recording area M1, a process ID recording area M2, and a buffer position recording area M3, in which information on a state variable, a process ID, and a user buffer position can be written, are provided in the respective request information entries 5, 6 and 7 of the input / output unit 4. It is provided. The status variable indicates the status of the request information entry and has three statuses of "unused status", "waiting" and "processing". The process ID records the process ID of the requesting user process, and the user buffer position records the storage position of the data of the user who interacts with the second information processing apparatus 10.
The request number counter 8 stores the number of write requests to the shared memory 11 in the second information processing device 10. Data exchange through the shared memory 11 is performed in the same manner as the procedure shown in the flow chart of FIG.

FIG. 2 shows a flow chart of a processing procedure in the input / output unit 4 when a processing request is issued from the user processes 2 and 3 of the first information processing apparatus 1. In this figure, when there is a request from the user processes 2 and 3, first, the state variables of the request information entries 5, 6 and 7 are referred to search for "unused" information, and the process ID and user buffer position information Is written in each of the areas M2 and M3, and the state variable of the area M1 is changed to "wait". Further, 1 is added to the request number counter 8 (steps S1 to S3). Next, it is determined whether or not the request counter 8 is 1, and if it is 1, it is writable, so the process ID and interrupt type are written to the output port (steps S4 to S5). This interrupt type represents a distinction between a “data takeover request interrupt” and a “data takeover completion interrupt”. The value of this output port is the second
Can be read from the input port of the information processing device 10. Next, the state variable is changed to "processing", data (request) is written in the shared memory 11, and a data take-back request interrupt is generated (steps S6 to S7). afterwards,
The request source user processes 2 and 3 are placed in a waiting state (step S8). On the other hand, when the value of the request number counter 8 is larger than 1, the shared memory 11 cannot be written, so no processing is performed and the request source user processes 2 and 3 are put in a waiting state (steps S4 and S8).

Next, the interrupt routine in the first information processing apparatus 1 will be described with reference to the flowchart of FIG. As shown in this figure, the interrupt processing of the first information processing device 1 is
When an interrupt occurs, the process ID and interrupt type are read from the input port (step S9). If it is a data collection completion interrupt, the second information processing device 10
Has finished drawing the request, so the request counter 8
Is subtracted from 1 (steps S10 to S12). afterwards,
The value of the request number counter 8 is checked. If it is larger than 0, there is a request waiting to be processed. Therefore, the request information entry 5, 6, 7 is searched for a request whose status is "waiting", and the second request is made again. Notify the information processing device 10 of the request (step S
14-S17). On the other hand, when the interrupt type is the data take-up request interrupt, the result is notified from the second information processing device 10, and thus the process I read from the input port is used.
The data (result) read from the shared memory 11 is transferred to the user buffer positions indicated by the request information entries 5, 6, and 7 corresponding to D (steps S10 and S18). After that, the state variables of the request information entries 5, 6, and 7 are returned to "unused", and a data takeover completion interrupt is generated for the second information processing device 10 (steps S19 to S2
0). Then, the request source user processes 2 and 3 which have been in the waiting state in the processing shown in FIG. 2 are activated (step S21).

Next, the interrupt routine in the second information processing apparatus 10 will be described with reference to the flowchart of FIG. In the figure, in the interrupt processing of the second information processing apparatus 10, when an interrupt is first received, the interrupt type is determined (steps S22 to S23). If it is a data fetch request interrupt, data is fetched, the process ID and interrupt type are written to the output port, and then a data fetch completion interrupt is generated (steps S24 to S26). After that, internal processing according to the request is performed, and after the processing is completed, the data (result) is written in the shared memory 11, the process ID and the interrupt type are written in the output port, and then the data take-back request interrupt is generated (step S27 ~ S
30). The internal processing is executed by another process, and this interrupt routine can accept multiple processing. On the other hand, if the accepted interrupt is the data take-over completion interrupt, end processing is performed (steps S23, S3
1).

In the above-mentioned embodiment, the input / output port is used as the notification method of the interrupt type and the process ID.
It is also possible to notify these in the shared memory 11.
FIG. 5 shows a configuration example of the shared memory 11 in this case. In this figure, 13 and 14 are the first information processing device 1 respectively.
Is an area for writing the interrupt type for notifying the second information processing apparatus 10 to the second information processing apparatus 10 and an area for writing the process ID. Reference numerals 16 and 17 are an area for writing an interrupt type for notifying in the reverse direction and an area for writing a process ID. Reference numerals 15 and 18 denote user data areas, and these areas are also used for transfer from the first information processing apparatus 1 to the second information processing apparatus 10 and vice versa.

The present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the invention.

[0014]

As described above, according to the present invention, the request information entry of the first information processing apparatus is provided with the area for recording the process ID of the user and the area for recording the status of the request, and further the input / output unit. A request counter was added to. Further, by providing a shared memory in the second information processing apparatus and notifying the process ID between these information processing apparatuses, without waiting for the result of the previous request to the partner apparatus via the shared memory,
It became possible to send the following requests continuously. Moreover, since the results of the requests can be obtained in any order, the entire processing time is not governed by the requests that take part of the processing time, and the processing efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an information processing device according to a data communication system of the present invention.

FIG. 2 is a flowchart showing a request process from a user process in an input / output unit of the first information processing device.

FIG. 3 is a flowchart showing an interrupt routine of the first information processing device.

FIG. 4 is a flowchart showing an interrupt routine of the second information processing apparatus.

FIG. 5 is a configuration diagram of a shared memory according to another embodiment.

FIG. 6 is a block diagram of an information processing apparatus for explaining a conventional data communication system.

FIG. 7 is a flowchart showing a procedure for exchanging data via the shared memory in the information processing apparatus shown in FIGS. 1 and 6.

[Explanation of symbols]

 1 First Information Processing Device 2, 3 User Process 4 Input / Output Unit 5, 6, 7 Request Information Entry 8 Request Number Counter 9 Control Unit 10 Second Information Processing Device 11 Shared Memory 12 Processing Unit 13, 17 Interrupt Type Area 14, 16 Process ID area 15, 18 User data area M1 Request processing status recording area M2 Process ID recording area M3 Buffer position recording area

Claims (1)

[Claims] 1. A first information processing apparatus having a plurality of user processes and having a plurality of request information entries in an input / output unit, and a second information processing apparatus having a shared memory and a processing unit. Data communication is performed, and the data of the processing request from the user process is written to the shared memory via the request information entry, and then taken into the processing unit of the second information processing apparatus and processed. In the data communication method between the information processing devices, which is written back to the shared memory and then returned to the user process of the first information processing device via the request information entry, a data communication method between the information processing devices is provided in the input / output unit of the first information processing device In the above request information entry, a process ID recording area for recording the process ID of the user process for which a processing request is made, and at least this request information entry A request status recording area is provided for recording the processing status of a request whether the data is in use or not, and whether or not the data of the request processing from the user process is in a waiting state before being fetched by the second information processing apparatus. ,
A request for storing the number of write requests to the shared memory, which is counted up when there is a processing request from the user process and is counted down after the data of the processing request from the user process is fetched by the second information processing device side. A number counter is provided in the input / output unit, and has means for notifying the process IDs recorded in the process ID recording area to each other when data is exchanged between the first and second information processing devices, and the request state is provided. A data communication system between information processing apparatuses, wherein data of a processing request from the user process is sent to a second information processing apparatus with reference to the contents of a recording area and the value of the request number counter.