JPH0194461A - Data processor - Google Patents

Abstract

PURPOSE:To prevent unprocessed data from being destroyed by performing a break when unprocessed data do not exist on a receiving buffer without immediately responding to the break symbol from a terminal. CONSTITUTION:The circuit breaking symbol transmitted from a terminal 4 is transferred through an input/output means 14 to a control means 13, and the control means 13 transfers a control to a circuit breaking means 16. The circuit breaking means 16 receives the notification of a supervising means 17, when the unprocessed data of an application program 11 do not exist, the means 16 immediately breaks a public communicating circuit 2, when the unprocessed data exist, it supervises the presence and absence of the unprocessed data at every fixed time, while the unprocessed data exist, it does not break the public communicating circuit 2, and when the unprocessed data do not exists, the public communicating circuit 2 is broken. Thus, the unprocessed data of the application program 11 can be prevented from being destroyed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a line disconnection code reception control means for a public telephone line.

〔overview〕

The present invention provides means for disconnecting a host computer that asynchronously receives data from a terminal from a line, by executing the disconnection after there is no unprocessed data in the receive buffer, without immediately responding to a disconnection code from the terminal. , it is possible to prevent unprocessed data from being discarded.

[Conventional technology]

Conventionally, this type of public communication line disconnection method immediately disconnects the public communication line upon receiving a line disconnection code (DLE, EOT).

[Problem that the invention seeks to solve]

In such conventional disconnection methods, the public communication line is immediately disconnected when a line disconnection code is received, so a receive buffer is used for data reception processing in the application program and reception processing with the terminal. A host computer having an asynchronous reception means has a drawback that if there is unprocessed data of an application program on the reception buffer, the unprocessed data is discarded.

The present invention aims to eliminate such drawbacks and provides a data processing device that does not discard unprocessed data on a receive buffer.

[Means for solving problems]

The present invention provides a receiving buffer for temporarily storing data arriving from a terminal via a public communication line, an application program means for processing the data on the receiving buffer, and a self-device based on a line disconnection code coming from the terminal. A data processing device comprising a line disconnection means having a disconnection means for disconnecting the line disconnection code from the public communication line, a timer means that starts counting from the time when the line disconnection code arrives, and a timer means that starts counting from the time when the line disconnection code arrives and the timer means monitoring means for repeatedly monitoring the presence or absence of unprocessed data on the receiving buffer at each time specified by the means, and the line disconnecting means detects that the monitoring means has unprocessed data on the receiving buffer The present invention is characterized by comprising means for requesting the monitoring means to continue monitoring when this occurs, and for activating the disconnection means when it is detected that there is no unprocessed data on the reception buffer.

[Effect]

The monitoring means monitors the presence or absence of data on the reception buffer.

The disconnection process of the public communication line based on the line disconnection code received from the terminal will be performed immediately if there is no unprocessed data of the application program upon receiving the notification from the monitoring means, and if there is data, the unprocessed data will be disconnected after a certain period of time by the timer means. We repeatedly monitor the presence or absence of data to ensure that there is no unprocessed data (
Then, the disconnection process is executed.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. The figure is a block configuration diagram showing the configuration of an embodiment of the present invention.

In this embodiment, as shown in the figure, the host computer 1
and a terminal 4 connected to a host computer 1 via a telephone switching network 3 via a public communication line 2. Here, the host computer 1 includes an application program 11, an asynchronous reception means 12 that stores and retrieves received data in a reception buffer 15, and notifies the application program 11 of data, and a timer notification means 1.
control means 13 that performs failure detection and recovery using a data transmission control procedure in the event of an abnormality using 8; input/output means 14 that performs serial-parallel conversion of data and transmits and receives signals to and from the terminal 4; and a reception buffer that stores received data. 15, line disconnection means 16 for disconnecting the public communication line according to the line disconnection code received from the terminal, and monitoring means 17 for monitoring and notifying the presence or absence of data on the reception buffer 15.
and a timer notification means 18 for measuring and notifying a certain period of time. That is, this embodiment includes a receiving buffer 15 that temporarily stores data arriving from the terminal 4 via the public communication line 2, an application program 11 that processes the data on this receiving buffer 15, and a receiving buffer 15 that temporarily stores data arriving from the terminal 4 via the public communication line 2. A line disconnection means 16 having a disconnection means for disconnecting the own device from the public communication line 2 based on the line disconnection code, a timer notification means 18 which is a timer means that starts counting from the time when the line disconnection code arrives, and a line disconnection code. a monitoring means 17 for repeatedly monitoring the presence or absence of unprocessed data on the receiving buffer 15 at each time specified by the time cycle of arrival and the timer means; 17 requests the monitoring means 17 to continue monitoring when it detects that there is unprocessed data on the receiving buffer 15, and requests the monitoring means 17 to continue monitoring when it detects that there is no unprocessed data on the receiving buffer 15. has means for activating.

Next, the operation of this embodiment after the host combinator 1 and the terminal 4 become communicable via the telephone switching network 3 after dialing is explained. Reception frames and transmission control codes sent from the terminal 4 through the public communication line 2 are received by the input/output means 14, converted from bit serial to bit parallel, and then sent to the control means 13.
passed to.

The control means 13 extracts data from the received frame format and passes the data to the asynchronous reception means 12. The asynchronous reception means 12 stores this data in the reception buffer 15, takes out the data from the reception buffer 15 based on the reception request of the application program 11, and passes it to the application program 11. Once the data is passed to the application program 11, the receive buffer 15 is released.

When the data is received and the work is completed in this way,
A line disconnection code (DLE, EOT) is transmitted from the terminal 4. This line disconnection code is passed to the control means 13 through the input/output means 14. When the control means 13 receives the line disconnection code, it passes control to the line disconnection means 16. The line disconnecting means 16 to which control has been given receives the notification from the monitoring means 17 and immediately disconnects the public communication line 2 if there is no unprocessed data of the application program 11. If there is unprocessed data, the line disconnection means 16 sends a timer notification means 18.
Pass control to. The timer notification means 18 passes control to the line disconnection means 16 after a predetermined time has elapsed. The line disconnecting means 16 to which control has been transferred receives the notification from the monitoring means 17 again and monitors the presence or absence of unprocessed data of the application program 11. Here, if there is no unprocessed data of the application program 11, the public communication line 2 is immediately disconnected. If there is unprocessed data, the line disconnection means 16 transfers control to the timer notification means 18 again.

In this way, when a line disconnection code is received, the line disconnection means 16 monitors the presence or absence of unprocessed data at regular intervals, does not disconnect the public communication line 2 while there is unprocessed data, and issues a timer notification again. Control is passed to the means 18, and the public communication line 2 is disconnected when there is no more unprocessed data.

〔Effect of the invention〕

As explained above, the present invention monitors the presence or absence of unprocessed data on the reception buffer, thereby allowing the public communication line to be connected only when there is no application program unprocessed data in the reception buffer even if a line disconnection code is received. Since it does not disconnect, it has the effect of not discarding unprocessed data of the application program.

[Brief explanation of the drawing]

The figure is a block configuration diagram showing the configuration of an embodiment of the present invention. 1... Host combination Niichiyo, 2... Public communication line,
3... Telephone switching network, 4... Terminal, 11... Application program, 12... Asynchronous receiving means, 13... Control means, 14... Input/output means, 15... Reception buffer , 16... Line disconnection means, 17... Monitoring means, 18... Timer notification means. Patent applicant: NEC Corporation, 7. ,? Agent Patent Attorney Nao Takashi Ide"゛,'To-3:

Claims (1)

[Claims] (1) A reception buffer that temporarily stores data arriving from a terminal via a public communication line, an application program means for processing the data on this reception buffer, and an application program means that automatically disconnects the own device based on a line disconnection code that arrives from the terminal. A data processing device comprising a line disconnection means having a disconnection means for disconnecting from the public communication line, a timer means for starting time measurement from the time when the line disconnection code arrives; and a timer means for starting time measurement from the time the line disconnection code arrives. monitoring means for repeatedly monitoring the presence or absence of unprocessed data on the reception buffer at each time specified by the line disconnection means; The data processing device further comprises means for requesting the monitoring means to continue monitoring when the data processing time is reached, and for activating the disconnection means when detecting that there is no unprocessed data on the reception buffer.