JPS6361320A - Auxiliary storage processor with preliminary verifying mechanism - Google Patents

Abstract

PURPOSE:To constitute a device at low cost by applying a mechanism to execute simultaneously a comparing processing an updating processing with one instruction in order to assure to execute exclusively the simultaneous updating from plural processes to auxiliary storage medium. CONSTITUTION:To an auxiliary storage processor 1 with a preliminary verifying mechanism, auxiliary storage medium 4, main storage medium 5 and a central processing unit 7 of a host computer are connected. The processor 1 is provided with a request analyzing means 2, an input output processing means 3 with preliminary verification and an exclusive control part 6. The processing means 3 has a verifying processing part 3a, a verifying result judging part 3b and a data input output processing part 3c. Thus, since the verifying processing and the input/output processing are requested by one request, the verifying processing and the input/output processing are simultaneously executed. While said processing is executed, the data part for input output and verification on auxiliary storage medium 4 to the process is not updated by other process.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to simultaneous use of auxiliary storage processing devices, and more particularly to a mechanism for simultaneous updating of shared data on an auxiliary storage medium.

[Conventional technology]

Conventionally, consistency in this type of simultaneous update of shared data on an auxiliary storage medium has been guaranteed using a locking mechanism that locks the area to be updated in the auxiliary storage medium before a data update request is made to the auxiliary storage processing unit. This was done by having a separate auxiliary storage processing device and issuing a lock request to the locking mechanism device in advance to ensure that the target data portion was not updated by other processes.

[Problems to be Solved by the Invention] The conventional lock a side described above has a structure that has an internal lock view, but normally the lock view is installed on a computer system independently of the general user. In many cases, the general program is not able to freely specify the lock management of the lock mechanism device, such as because the number of locks is limited.

Therefore, it is difficult to realize a flexible usage pattern. Furthermore, if an attempt is made to make the system usable from the -S program by increasing the number of locks, the problem arises that it becomes a dedicated device and is generally expensive.

The purpose of the present invention is to make it possible to simultaneously update the shared data in the auxiliary t9 medium with an inexpensive configuration and in an easy-to-use form that allows the general program itself to be the main body of lock management. be.

Means for Solving Problem C] The auxiliary storage processing device with a pre-verification mechanism of the present invention has the ability to update the auxiliary storage medium simultaneously from multiple processes exclusively. Basic CPU instructions used for exclusive use of shared data (generally,
The mechanism that simultaneously performs comparison processing and update processing using a - command (-request), which is called a gate command, etc., is applied to the auxiliary storage processing unit. In addition to the location of input/output data, the location of verification data is also specified for data location information on the main storage medium and auxiliary storage medium, which is one of the specified information when an input/output request is made from each process. When a request is issued, the auxiliary storage processing device processes input/output data only when the verification data on the main storage medium specified as verification data and the verification data on the auxiliary storage medium are the same image. The auxiliary storage processing device that sets a request called an input/output request with pre-verification to be processed and realizes the processing for this request has the following request analysis means and input/output processing means with pre-verification.

(11) Request analysis means: Analyzes whether the input/output request is an input/output request with pre-verification, and if it is an input/output request with pre-verification, passes control to the input/output processing unit with pre-verification.

(2) Input/output processing means with pre-verification; It is composed of a verification processing section, a verification result judgment processing section, and an input/output processing section, and each processing section performs the following operations.

- Verification processing unit: Performs verification processing on the verification request data images specified on the main storage medium and the auxiliary storage medium, and passes control to the next verification result judgment unit.

■ Verification result judgment unit: Judges the processing result of the verification processing unit, and if it is determined that the verification data on the main storage medium and the verification data on the auxiliary storage medium are the same image, control is transferred to the next input. Pass it to the output processing section. If it is determined that the images are not the same, processing of the input/output request with pre-verification is terminated.

(i) Input/output processing section: Performs data input/output processing between input/output data sections specified on the main storage medium and the auxiliary storage medium.

[Effect]

Since verification processing and input/output processing are requested in one request,
When verification processing and input/output processing are performed simultaneously, and while the input/output processing means with pre-verification is being processed for a certain process, the input/output data section and the verification data section on the auxiliary storage medium for that process are is guaranteed not to be updated by other processes.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which 1 is an auxiliary storage processing device with a pre-verification mechanism, 2 is a request analysis means, and 3 is a block diagram of an embodiment of the present invention.
3a is an input/output processing means with pre-verification; 3a is a verification processing unit; 3
3c is a data input/output processing section, 4 is an auxiliary storage medium, 5 is a main storage medium, 6 is an exclusive control section, and 7 is a central processing unit of the host computer. In addition, the first
The figure shows that data is transferred to the data section on the main storage medium 5 only when the data image of the data section B on the main storage medium 5 and the data image of the data section on the auxiliary storage medium 4 are the same. It also serves as a processing schematic diagram when a process P operating in the central processing unit 7 of the host 1-comviator issues a write request R with pre-verification to write to the data section a above.

In FIG. 1, when a write request R with pre-verification is issued from a process P running on the central processing unit 7 to the auxiliary storage processing device 1 with pre-verification mechanism, the request R is accepted by the exclusive control unit 6. Later, when the request analysis means 2 analyzes the request and determines that it is an input/output request with pre-verification, control is passed to the input/output processing means 3 with pre-verification.

Further, if it is determined that it is a normal input/output request without prior verification, control is passed to the data input/output processing unit 3c,
Data is entered without prior validation.

Note that the exclusive control unit 6 executes processing for each request in units of devices such as auxiliary storage devices, for example.
If another conflicting request occurs while a request is being processed, the request is put on hold.

In the input/output processing unit 3 with pre-verification, first, the verification processing unit 3a writes the verification data portion on the auxiliary storage medium 4 designated by the write request R with pre-verification and the verification data portion on the main storage medium 5. Verification is performed to see if the data image matches B, and the result is determined by the verification result determining section 3b.

When the verification result determination unit 3b determines that the images are the same, it passes control to the data input/output processing unit 3c in order to write the data in the data area A to the data area a, and the data input/output processing unit 3c responds to this. Returns the data writing status to process P.

At this time, while the verification processing section 3a, verification result judgment section 3b, and data input/output processing section 3c are executing the processing for the process P, the above-mentioned exclusive control section 6 controls the data part a on the auxiliary storage medium 4 by other processes, The writing process for b is not performed.

In addition, in the judgment of the verification result judgment unit 3b, the data part B
If it is determined that and the data part are not the same image,
The write request R with pre-verification is interrupted, the write process is not performed, and a status indicating that the verification result is not satisfied is returned to the process P, and the processing for the request R ends.

Above, we have explained an example of a write request with pre-verification, but a read request with pre-verification can also be realized in the same way.
By using a read request with pre-verification, it is possible to check whether data on the auxiliary storage medium has been referenced or updated by another process after it has been referenced or updated by the own process, and various usage methods can be adopted. obtain.

Next, as a more specialized example of the embodiment shown in FIG. Part A.

The relationships among B, a, and b are the same as in FIG. 1).

This is an example in which data part a and data part 2 in FIG. 1 are the same location, and data part a is lock/unlock data for one shared resource. In other words, under the following data definition data part a image = all zero unro, state data part a image = non-zero lock state, the following processing rules are used as the lock/unlock process of each process for the shared resource. By establishing this convention and having all related processes adhere to this convention, consistent lock management can be achieved.

fil lock status check processing rules: Issue a read request without prior verification of data section a and check the read image. If it is in an all-zero state, it is in an unlocked state, and if it is in a non-zero state, it is in a locked state.

(2) Lock processing rules: Set a non-zero image in the data section A and an all-zero image in the data section B, and issue a write request with pre-verification.In the input/output status check after the zero-person output is completed, the verification result does not match ( In other words, if the data part a image is in a non-zero state and the shared resource is locked by another process, the lock process is usually retried after a short wait.

(3) Unlock processing rules: Only the process that applies the lock issues a write request without prior verification with an all-zero image sent to the data section.

〔Effect of the invention〕

As explained above, by providing an auxiliary storage processing device with a pre-verification mechanism, the present invention allows simultaneous access of data on an auxiliary storage medium by multiple processes without contradiction.
Moreover, it has the effect of providing an easy-to-use format at a low cost that allows the general program itself to be the main body of lock management. In addition, if this technology is incorporated as a general-purpose technology into a general auxiliary storage processing device that can be accessed at high speed,
The technology for increasing the speed of access to the auxiliary storage medium has the effect of also becoming a technology for increasing the speed of lock/unlock processing. Furthermore,
Another advantage is that it can be used as a base mechanism for an 8G structure for simultaneous access to auxiliary storage media from multiple host computers in a loosely coupled multiprocessor system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the invention. In the figure, 1... auxiliary storage processing device with pre-verification mechanism, 2... request analysis means, 3... input/output processing means with pre-verification, 3a... verification processing unit, 3b... verification result Judgment unit, 3C...Data input/output processing unit, 4...Auxiliary storage medium, 5...Main storage medium, 6...Exclusive control unit, 7...Central processing unit of host combinator , P...
·process.

Claims (1)

[Scope of Claims] An auxiliary storage medium, a main storage medium, an auxiliary storage processing device that performs data input/output processing between both media, and a central processing unit that executes multiple processes that issue input/output requests to the auxiliary storage processing device. In the data processing system, the auxiliary storage processing device includes a request analysis means, and an input/output processing means with pre-verification including a verification processing section, a verification result judgment processing section, and an input/output processing section, Regarding the data location information on the main storage medium and the auxiliary storage medium as one of the specified information at the time of input/output request from each process to the auxiliary storage processing device, in addition to the location of the input/output data, verification purposes Input/output to the input/output data is required only when the verification data on the main storage medium and the verification data on the auxiliary storage medium, including the data location, are the same image. When the process issues an input/output request with pre-verification that requests verification processing and input/output processing in one request to the auxiliary storage processing device, the request analysis of the auxiliary storage processing device means determines the input/output request with pre-verification and passes control to the input/output processing means with pre-verification; performs verification processing on the verification data images specified on the storage medium and passes control to the verification result judgment processing section, and the verification result judgment processing section judges the processing results of the verification processing section. , if it is determined that the verification data on the main storage medium and the verification data on the auxiliary storage medium are the same image, control is passed to the input/output processing section; When processing of the input/output request with verification is terminated, and the input/output processing section takes over control from the verification result judgment processing section, the input/output processing section stores the specified input/output data sections on the main storage medium and the auxiliary storage medium. 1. An auxiliary storage processing device with a pre-verification mechanism, characterized in that it is configured to perform data input/output processing between data points.