JP2715678B2 - I / O device occupancy control method and occupancy control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an occupancy control method and an occupancy control device for an input / output device.

[0002]

2. Description of the Related Art A conventional occupancy control method for an input / output device and an environment in which the occupancy control device is used, as shown in a block diagram of FIG. A plurality of input / output devices 11, 1 commonly used
The control device 10 of the input / output device is located between the control devices 2, 13, and 14, and controls the mutual connection.

The control device 10 of the conventional input / output device receives, for example, an occupation command for the input / output device 11 output from the host system 8 and causes the host system 8 to occupy the input / output device 11. When the host system 8 receives the release command output from the host system 8 and releases the occupied input / output device 11, and the host system 8 receives the occupation command for the input / output device 11 output from the host system 9, the occupancy command is issued. After the rejection and the release of the input / output device 11, the release of the input / output device 11 is notified to the host system 9 which rejected the occupation command first.

[0004]

The above-described conventional occupancy control method and occupancy control device for an input / output device receive a release command output from a host system and release the occupied input / output device. Therefore, if the host system occupying this I / O device keeps its occupation state and is left as it is, this I / O device will not be used by the occupying host system nor by other host systems, so it will be effective. There is a problem that it cannot be used.

[0005] It is an object of the present invention to provide an I / O device that is occupied by a host system but has not been used for a certain period of time issues a release request to the occupied host system to effectively utilize the I / O device. It is an object of the present invention to provide an occupancy control method and an occupancy control device for an input / output device that can perform the above.

[0006]

According to the present invention, there is provided a method for controlling occupancy of an input / output device, the method comprising controlling various types of control between a plurality of host systems and a plurality of input / output devices commonly used by the host systems. Receiving an occupation command for a specific input / output device output from the first host system from among the
Occupies the specific input / output device in the upper system, releases the occupied specific input / output device in response to a release command output from the first higher system, and the first upper system Receiving an occupation command for the specific input / output device output from the second host system while occupying the input / output device, rejects the occupation command, and releases the second input / output device after the release of the specific input / output device. In the input / output device occupation control method of notifying the release of the specific input / output device to the first input / output device, the elapsed time of the occupation state of the specific input / output device occupied by the first higher-level system is measured and predetermined. if is occupied more time length to said first host system I to perform a release request of the specific output device
Ttei Ru.

An occupancy control device for an input / output device according to the present invention is located between a plurality of host systems and a plurality of input / output devices commonly used by the host systems. Occupancy release storage means for receiving an occupation command and a release command for a specific input / output device to be executed and storing a state of occupation and release of the first input / output device with respect to the specific input / output device; Command rejection means for receiving an occupation command for the specific input / output device output by the second host system while occupying the specific input / output device, and notifying the second host system that the occupation command has been rejected; Knowing that the storage state of the occupation release storage means for the specific input / output device has changed from occupation to release, and releasing the specific input / output device to the second higher-level system. In the occupied control device having a release reporting means to be notified, the occupied open storage means that the first host system is occupied the specific output device
Monitoring means to measure the elapsed time and output a time-out signal when a predetermined time length is exceeded, and a time-out signal output from the time-out means. Release request means for transmitting a release request signal requesting release of the input / output device.

The occupancy control device of the input / output device of the present invention monitors the storage state of the occupancy release means, starts measuring the elapsed time when an arbitrary input / output device is occupied, and measures the elapsed time if the input / output device exceeds a predetermined time length. The time-out means for outputting the time-out signal may have a function of returning the measurement of the elapsed time to an initial value and restarting the measurement when the input / output device measuring the elapsed time is in use.

[0009]

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

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

An occupancy control device for an input / output device according to the present invention is located between a plurality of host systems and a plurality of input / output devices commonly used by the host systems, and receives commands from the host system. And a main control unit 1 for decoding and outputting to each unit in the device, and an occupation command and a release command for a specific input / output device from a higher system received and output by the main control unit 1 for a specific input / output device. An occupancy release storage unit 2 for storing the state of occupation and release of the input / output device, and the occupancy release when another host system outputs an occupation command for the same specific input / output device while the host system occupies the specific input / output device. Since the command is rejected, the main control unit 1 notifies that the occupation command has been rejected, and the command rejection unit 3 for notifying the other higher-order system. The status of the occupied input / output device is changed from occupation to release from the main control unit 1 through the occupation release storage unit 2, and a occupation command is sent out first, and a specific input The release report unit 4 for notifying the release of the output device and the occupation release storage unit 2 for monitoring the use state after the host system occupies the specific input / output device, and when the occupation state is detected, the elapsed time is measured. A timer 5 that outputs a timeout signal when a predetermined time length is exceeded,
Upon receiving a timeout signal output from the timer 5, a release request unit 6 for transmitting a release request signal for requesting the host system to release the occupied specific input / output device, and a main control unit 1
If the received command is a command other than occupation and release, this command is received, and if this command is a command for the input / output device that is measuring the elapsed time of the hold state, the operation of the timer 5 is stopped. And a command control unit 7 capable of outputting a signal.

Next, the operation will be described.

The main controller 1 receives a command from the host system and decodes it. If this command is an occupation command or a release command, it is sent to the occupation / release storage unit 2, and if it is another command, it is sent to the command control unit 7. Occupation release storage unit 2
Stores the release of the occupancy of each input / output device, and receives an instruction from the main control unit 1 when the status of the occupied input / output device changed from occupation to release is transmitted when the occupation command is transmitted first. Is passed to the release report unit 4. The release report unit 4 sends an occupancy command first and notifies the rejected host system of the release of a specific input / output device. When the command is an occupation command and is for an input / output device already occupied by the occupation command, the main control unit 1 that has learned this,
The process is passed to the command rejection unit 3, and this is stored.
The command rejection unit 3 reports that the command has been rejected because the input / output device that wants to be occupied by the host system that rejects the command is already occupied. The timer 5 monitors the occupation release storage unit 2, measures the elapsed time when detecting the occupation state, and outputs a time-out signal when the time exceeds a predetermined time length.
Of course, if the input / output device being measured is released during the measurement period, the timer 5 stops the measurement. The release request unit 6
Upon receiving the time-out signal output from the timer 5, it sends a release request signal requesting the release of the occupied specific input / output device to the host system.

When the command received by the main control unit 1 is a command other than occupation and release, the command control unit 7 receives the command, and transmits the command to the input / output device whose elapsed time in the hold state is being measured. If it is a command, an operation stop signal can be output to the timer 5. Normally, the timer 5 ignores the operation stop signal even if it is received, and continues the measurement. However, the timer 5 is configured to add a further function to return the elapsed time measurement to the initial value and start the measurement again. Is also possible.

[0015]

As described above, according to the present invention, the control system of the conventional I / O device monitors the use state after the host system occupies the I / O device and measures the elapsed time when the hold state is detected. Timer means for outputting a timeout signal when a predetermined time length is exceeded, and release request means for transmitting a release request signal for requesting the above-mentioned upper system to release the input / output device upon receiving the timeout signal output from the time limit means With this arrangement, an I / O device that has been occupied by the host system but has not been used for a certain period of time can be released from the occupying host system by making a release request, thereby effectively utilizing the I / O device. There is an effect that it becomes possible.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a conventional occupancy control method for an input / output device and an environment in which the occupancy control device is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main control part 2 Occupation release storage part 3 Command refusal part 4 Release report part 5 Timer 6 Release request part 7 Command control part

Claims (3)

(57) [Claims] 1. A specific input / output device output from a first host system from among various control methods performed between a plurality of host systems and a plurality of input / output devices commonly used by the host systems. Receiving the occupation command for the first
Occupies the specific input / output device in the upper system, releases the occupied specific input / output device in response to a release command output from the first higher system, and the first upper system Receiving an occupation command for the specific input / output device output from the second host system while occupying the input / output device, rejects the occupation command, and releases the second input / output device after the release of the specific input / output device. In the input / output device occupation control method of notifying the release of the specific input / output device to the first input / output device, the elapsed time of the occupation state of the specific input / output device occupied by the first higher-level system is measured and predetermined. occupancy control method of the input-output device if is occupied more time length to said first host system and carrying out the release request for the specific output device. 2. An occupation command for a specific input / output device, which is located between a plurality of host systems and a plurality of input / output devices commonly used by the host systems, and output by the first host system, Occupancy release storage means for receiving a release command and storing the state of occupation and release of the first higher-level system with respect to the specific input / output device; In response to the occupation command for the specific input / output device output from the second higher-level system, the second occupation command is rejected.
Command rejection means for notifying the higher-level system, and the second higher-level system knows that the storage state of the occupation release storage means for the specific input / output device has changed from occupation to release. in the occupied control device having a release reporting means for notifying releasing the said first host system has occupied the specific output device
When the elapsed time is detected by monitoring the occupancy release storage means, the elapsed time is measured, and when the time exceeds a predetermined time length, a time-out signal is output. An occupancy control device, comprising: release request means for transmitting a release request signal requesting release of the specific input / output device. 3. The time limit means for monitoring the storage state of the occupation release means, starting the measurement of the elapsed time when an arbitrary input / output device is occupied, and outputting a timeout signal when the time exceeds a predetermined time length. 3. The input / output device according to claim 2, further comprising a function of returning the measurement of the elapsed time to an initial value and starting the measurement again when the input / output device whose elapsed time is being measured is used. Occupancy control device.