JPS59157754A - System for outputting simultaneously plural members to source program library - Google Patents

Abstract

PURPOSE:To make it possible that plural members execute processings to a source program library simultaneously by providing a pointer indicating a retrieval range of unused blocks on a bit map. CONSTITUTION:The bit map manages the use state of all blocks in the program library, and blocks used for output of members are registered in the bit map after output of members. Before output of members, unused blocks are reserved on the bit map. The range of reserved blocks is stored with two pointers P1 and P2. Each time when an unused block is reserved, one pointer P2 is moved. After the output of all processing members is completed and all used maps are registered in the bit map, the pointer P1 is moved to the position of the pointer P2. Unused blocks are assigned to plural members simultaneously and exclusively. The double assignment of the same block is prevented.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to the structure of a source program library and its update method, and particularly to a library suitable for when multiple update requests occur simultaneously for one source program library. Regarding the simultaneous output method of multiple members.

[Prior art]

In a conventional source program library that consists of multiple fixed-length blocks on a direct access device and a bitmap that manages the usage status of each block, if multiple update requests occur to the library at the same time, unused blocks are allocated to multiple members. It is impossible to allocate simultaneously and exclusively, and it is impossible to output multiple members at exactly the same time. Therefore, there is a drawback that other update requests must wait until the update process for one member is completed.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a source program library that can process multiple update requests at the same time without causing a waiting state.

[Summary of the invention]

The present invention provides a source program library consisting of a plurality of fixed-length blocks on a direct access device and a bitmap for managing the usage status of each block. By making it possible to simultaneously and exclusively allocate unused blocks to members, simultaneous output of multiple members is made possible.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. The source program library consists of fixed-length blocks and bitmaps that manage them.

and two pointers (Pl and P2 in the figure) indicating the searchable range of unused blocks in the bitmap.

The bitmap manages the usage status of all blocks in the library, and the blocks used when outputting the member are registered in the bitmap after the member is output. Note that one member generally occupies multiple blocks, but in order to keep the blocks in the output cylinder unused even if the member's output processing is interrupted, the bitmap update requires the output of all blocks of the member to be kept in an unused state. Must be done after completion.

Therefore, when output requests from a plurality of members occur simultaneously, if unused blocks on the pit map are allocated to each member at the same time, the same block will be double allocated.

Two pointers pl and pz in the figure solve this problem. That is, double allocation can be prevented by reserving unused blocks on the bitmap prior to member output and storing the range of the reserved blocks using two pointers pt and pz. Each time an unused block is reserved, one pointer P2 is moved, and after the output of all members being processed at the same time is completed and all used blocks are registered in the focus map, the pointer p+ is moved to the P2 position, and the two Match pointer positions. In this way, unused blocks can be simultaneously and exclusively allocated to a plurality of members and simultaneous output can be achieved.

The processing procedure for outputting members to the source program library is as shown in FIG. First, the output of the block (second
Reserve unused blocks (■ in Figure 2) before reserving unused blocks (■ in Figure 2)
)I do. Reservation of unused blocks is an operation to exclusively allocate unused blocks necessary for output of each member to each member when output requests from multiple members occur at the same time. P in Figure 1
2) will be migrated.

Next, check whether additional reservations for unused blocks are needed (
■) in Fig. 2), if necessary, reserve an unused block and output the block.

After outputting all the blocks of the member, the output block is registered in the bitmap (1) in FIG. 2. At the same time, it is checked whether there is a remember member currently being output (2 in FIG. 2). If there are no members being output at the same time, the positions of the two pointers in the bitmap are made to match, and the member output processing is completed.

〔Effect of the invention〕

According to the present invention, it is possible not only to simultaneously output multiple members but also to perform all kinds of processing on the source program library at the same time.

Even if many users use the same source program library to modify programs at the same time, there is no waiting state and they can work efficiently.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the structure of a source program library and a method for simultaneously outputting members A and B to the library, and FIG. 2 is a block diagram showing a processing procedure for outputting members to the source program library. pr, pz...pointer. Representative Patent Attorney Akita Takahashi;＼７ 2 Figures

Claims (1)

[Claims] 1. In a source program library consisting of multiple fixed-length blocks on a direct access device and a bitmap that manages the usage status of each block, two pointers are provided on the bitmap to indicate the search range for unused blocks. A method for simultaneously outputting multiple members to a source program library.