JPS61253567A - Data input and output system - Google Patents

Abstract

PURPOSE:To perform the input and output of data at a high speed in an operating system for multiple users and tasks by registering previously an address to an input/output segment of a memory control table to specify an input/output exclusive memory area of each process. CONSTITUTION:An address is registered to a segment (n+1) for data input/ output within a memory control table 2 to specify a data input/output subject memory area A of a process (a). While the addresses are registered to the segments (n+2) and (n+3) to specify the data input/output subject memory areas B and C of processes (b) and (c) respectively. When the process (a) is switched to the process (b), a scheduler 6 is switched and a data input/output controller 3 reads the address of the area B out of the segment (n+2). Then the data input/output is carried out between the area B of a memory 1 and a peripheral device, e.g., a floppy disk 5 desired by the process (b).

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a data input/output method (physical input/output method) suitable for a multi-user, multi-task operating system (O3) such as UNIX.

[Technical Background of the Invention] Conventionally, data input/output using an O8 has been performed using a configuration as shown in FIG. Symbols a, b, and c indicate processes attempting to perform data input/output, and areas A1B and C of memory 1 are memory areas for data input/output that are used exclusively by each process a1bSc. Memory management table 2 has segments 1 to 1 for data input/output of each of the above processes.
n and an input/output segment 21. However, in the input/output segment, an address specifying the memory area corresponding to the process currently attempting to input/output data is written by O8. The data input/output controller 3 is connected to peripheral devices such as a magnetic disk 4 and a floppy disk 5. Furthermore, this data input/output controller 3 controls the input/output segment 2 of the memory management table 2.
1 is read, and data input/output between the memory area of memory 1 specified by this address and a specific peripheral device desired by the process is controlled.

For example, input/output segment 2 of memory management table 2
If the address of memory area A is written in memory area A and process a wants to perform data input/output with magnetic disk 4, data input/output controller 3 performs data input/output transmission between memory area A and magnetic disk 4. It forms a path and performs data input and output.

Therefore, when a process switch (a change in the process that performs data input/output) occurs, O8 writes the address that specifies the memory area to which data is input/output into the input/output segment 21 in the memory management table 2. The input/output of the above data starts from here.

[Problems in the Background Art] By the way, the conventional data input/output device as described above is
When controlling with a multi-user, multi-tasking O8 such as NIX, a plurality of processes are generated to input and output data. Therefore, if you try to input/output data between multiple memory areas corresponding to these multiple processes and peripheral devices at the same time, the input/output segment 21 of the memory management table 2 will be rewritten each time the process switch is performed. The disadvantage is that the data input/output speed decreases due to the loss of rewriting time.

[Object of the Invention] In view of the above drawbacks, an object of the present invention is to provide a data input/output method that speeds up data input/output under a multi-user, multi-task operating system.

[Summary of the Invention] The present invention prepares a plurality of input/output segments in a memory management table, and when multiple processes occur, an address specifying a memory area dedicated to input/output of each process is set in advance for the input/output segments. The above objective is achieved by registering the address in the segment and notifying the data input/output controller of the corresponding address when a process switch occurs.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings, in which the same parts as those of the conventional example are denoted by the same reference numerals. FIG. 1 is a block diagram showing an embodiment of the data input/output method of the present invention. The symbols @a, b, and c are the processes that are attempting to input and output data, and the areas A, B, and C of memory 1 are the processes a,
This is the memory area for data input/output of b and c. Memory management table 2 has process segments 1.2.3, .
・・n and data input/output segments n+1, n+2・
...m. The data input/output controller 3 is connected to peripheral devices such as a magnetic disk 4 and a floppy disk 5. Also, this data input/output controller 3
reads the address written in the data input/output segment selected by the scheduler 6, and controls data input/output between the memory area of the memory 1 specified by this address and the peripheral device desired by the process. The scheduler 6 is switched in conjunction with a process switch so that the data input/output controller 3 can read an address specifying a target memory area of a process currently attempting to perform data input/output.

Next, the operation of this embodiment will be explained. First, when three processes a, b, and c are generated, O8 registers the memory area exclusive to processes a, b, and c in the process segment 1.2.3 of the memory management table 2. Next, when the three processes start data input/output at the same time, O8 registers the address (in IK units) that specifies the memory area A for data input/output of process a in the data input/output segment n+1 in the memory management table 2. Similarly, addresses specifying the memory areas B and C for data input/output of the process b1C are registered in segments n+1 and n+2 in the same manner. By the way, in O8 under time sharing multitasking like UNIX, process switching occurs, so processes a, b,
A switch occurs between C. When this process switch occurs, O8 switches the scheduler 6 and inputs the contents of the data input/output segment in which the address that specifies the memory area corresponding to the process currently attempting to input/output data is registered. Make it readable by the output controller 3.

That is, when process a is currently inputting and outputting data, the data input/output controller 3 uses the memory area A registered in the input/output segment n+1 of the memory management table 2.
Read the address of. For this reason, the data input/output controller 3 connects the area A of the memory 1 and a peripheral device desired by the process a, such as the magnetic disk 4, and controls data input/output between the two. Here, when a switch is made from process a to process b, the scheduler 6 is switched in conjunction with this, so the data input/output controller 3 reads the address of the memory area B from the input/output segment n+2. Therefore, data input/output is performed between area B of memory 1 and a peripheral device desired by process B, such as the floppy disk 5.

According to this embodiment, it is not necessary to rewrite the input/output segments in the memory management table 2 every time a process switch occurs, so data input/output can be performed at high speed under multi-process.

[Effects of the Invention] As described above, according to the data input/output method of the present invention,
If multiple input/output segments are prepared in the memory management table and multiple processes occur, the address that specifies the memory area dedicated to the input/output of the process must be registered in advance in the input/output segment, and the process switch If a process occurs, the corresponding address is read into the data input/output controller, and the process inputs and outputs data between the desired peripheral device and the corresponding memory area. This has the effect of improving the speed of data input/output under the operating system.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the data input/output method of the present invention, and FIG. 2 is a block diagram showing an embodiment of the conventional data input/output method. 1...Memory 2...Memory management table 3...I/O controller 4...Magnetic disk 5...Floppy disk 6...Scheduler agent Patent attorney Noriyuki Chika (and one other person)
stomach

Claims (1)

[Claims] When a process performs data input/output with a specific peripheral device, the data input/output controller reads the address written in the memory management table that specifies the memory area to be the data input/output target of the process, In a data input/output device that controls data input/output between the peripheral device and the memory area, a plurality of data input/output segments are provided in the memory management table, and when multiple processes occur, the data dedicated to each process is provided. An address that specifies the memory area to be input/output is written in each of the required number of data input/output segments in advance, and when a process switch occurs, the data input/output controller identifies the memory area exclusive to the corresponding process. 1. A data input/output method, characterized in that a switch means is provided for making it possible to read an address from said memory management table.