JPS6142057A - Securing system of contents of buffer - Google Patents

Abstract

PURPOSE:To improve the reliability for processing data by providing a buffer securing means so that the contents of a buffer are secured in a period required by a module. CONSTITUTION:When a program (buffer securing means) 12 receives a notice of a fact of receiving the security of the contents of a buffer, from a module 16, the program 12 sets a use flag 22 in a buffer control block (BCB)14 corresponding to a buffer 24 whose contents must be secured, to X''01'' (on state). Subsequently, said program receives a request for using the buffer, and processes it so that the buffer in which said use flag has been set to X''01'' is not used. Also, when the program receives a notice of a fact of releasing the security of the contents of the buffer, said use flag 22 is set to X''00'' (off state). By this processing, the buffer can be used thereafter.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for guaranteeing buffer contents for a certain period of time to a program that manages buffer contents.

(2) Prior Art and Problems In the conventional buffer management method, the contents of the buffer are changed sequentially as the program is executed, and therefore, there is a drawback that the contents of the buffer cannot be guaranteed for a necessary period of time.

(3) Purpose of the Invention In view of the above drawbacks, the present invention aims to guarantee the contents of the buffer for a predetermined period of time.

(4) Structure of the Invention The object is to provide a system that allocates a free buffer when a buffer use request is received, and when a request to guarantee the contents of a certain buffer is received, the flag of the buffer control block corresponding to the buffer is turned on, The present invention is characterized by providing means for canceling the subsequent use and allocation of the buffer, and turning off the flag when information FliI for canceling the guarantee of the buffer contents is received, and performing the subsequent use allocation of the buffer. 1 is made by the guarantee processing method.

(5) Examples of the invention The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In the figure, 11 is a CPU (central processing unit).

12 is a program (performs buffer management), 13 is a memory, and 14 is a buffer control block (BCB).
, 15 is a buffer, and 16 is a module.

FIG. 2 is a diagram showing the correspondence between buffer control blocks and buffer contents according to an embodiment of the present invention.

In the figure, 21 is the next BCB address, 22 is a use flag, 23 is a buffer address, 24 is a guaranteed buffer, 25 is a buffer in use, and 26 is an empty buffer.

When the program 12 (buffer guarantee means) receives a command meaning "guarantee the contents of the buffer" from the calling module 16, the program 12 (buffer guarantee means) waits until it receives a command meaning "cancel the guarantee of the contents of the buffer concerned." The purpose is to guarantee the contents of the buffer (not allow the contents to be changed).

For example, a program may set the usage flag 22 in the buffer control block 14 (BCB) corresponding to the buffer 24 to
02' (ON: dog yrs> Wait, then accept a request to use the buffer, and do not use the buffer whose usage flag is X'02'. Also, the module 16 sends a request to cancel the guarantee of the buffer contents. When the notification is received, the use flag 22 is set to X"00" (OFF state), and subsequent use is disabled by this process.

(6) As described in detail, according to the present invention, the buffer contents can be guaranteed for the period required by the module, and the reliability of data processing can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a diagram showing the correspondence between buffer control blocks and buffer contents according to an embodiment of the present invention. Explanation of symbols: 11 is CPU (central processing unit). 12 is a program (performs buffer management), 13 is a memory, and 14 is a buffer control block (BCB).
, 15 are buffers. -3 Figure 1

Claims (1)

[Claims] In a system that allocates a free buffer when a buffer use request is received, when a request to guarantee the contents of a certain buffer is received, a flag in the buffer control block corresponding to the buffer is turned on, and further use allocation of the buffer is stopped. 1. A buffer content guarantee processing method, comprising: means for turning off the flag when receiving information for canceling the buffer content guarantee and allocating the buffer for future use.