JPH06138984A - Information processor - Google Patents

Abstract

PURPOSE:To surely disconnect a system power supply even when an end processing program runs away and when no interrupt processing is enabled in the information processor which performs a power supply disconnection by the end processing program. CONSTITUTION:An execution monitoring means 42 monitors an end processing program 41, and sends a cancellation signal to a runaway monitoring means 32 for each reference time. The runaway monitoring means 32 judges that the end processing program 41 is normally executed during the cancellation signals are given. When no cancellation signal is given the lapse of a time longer than the reference time, the run before away monitoring means 32 judges the run away of the end processing program 41, disconnecting the system power supply.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus for controlling power-off by software.

[0002]

2. Description of the Related Art Conventionally, in a personal computer having a resume function (hereinafter referred to as a personal computer), power-off control is performed by software in order to save information necessary for resume. The procedure of this power-off control is as follows. First, when the user turns on the power-off switch while using the personal computer, an interrupt occurs and the termination processing program is started. By executing this termination processing program, the user application currently being executed is terminated normally, and information necessary for resume is saved. Then, after the execution of the termination processing program is completed, the system power of the personal computer is turned off.

[0003]

By the way, in the conventional personal computer in which the power-off control is performed by software as described above, even if the power-off switch is turned on, the power is turned off when the termination processing program runs out of control. I couldn't. Further, if the application program is being executed at the interrupt level with the same priority as the interrupt signal when the power-off switch is turned on, the termination processing program is not started, and thus the power cannot be turned off in this case as well.

An object of the present invention is to solve such a problem and to provide an information processing apparatus capable of reliably turning off the power supply.

[0005]

In order to solve the above-mentioned problems, the system termination control program of the information processing apparatus of the present invention includes a termination processing program activated by an interrupt and a termination processing program activated simultaneously with the start of the termination processing program. Execution monitoring means for transmitting a cancel signal to the management system when the termination processing program does not end before the elapse of the reference time is provided, and the management system is interrupted by power-off means and reception of the disconnection signal or the cancellation signal. And an runaway monitoring means that is activated at the same time as this interrupt and that activates the power-off means when a cancel signal is not received before the time equal to or longer than the reference time in the execution monitoring means elapses. To be

[0006]

According to the information processing apparatus of the present invention, when the disconnection signal is received by the management system, the interrupt generating means generates an interrupt and simultaneously activates the runaway monitoring means. When an interrupt occurs, the termination processing program of the system termination control program and the execution monitoring means are simultaneously activated. When the termination processing program does not terminate even after the reference time has elapsed, the execution monitoring means suspends the termination processing program and sends a cancel signal to the management system. If the cancel signal is received before the reference time elapses from the occurrence of the interrupt, the runaway monitoring means interrupts the processing and the interrupt generating means generates a new interrupt. If the cancel signal is not received even after the reference time has elapsed from the occurrence of the interrupt, the power-off means is activated to turn off the system power.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a conceptual diagram showing an information processing apparatus which is an embodiment of the present invention. The information processing apparatus 10 according to the present exemplary embodiment includes a power-off switch 20 for transmitting a disconnection signal, a management system 30 including hardware or software, and a system termination control program 40 that operates under the control of the management system 30. And are provided. Upon receiving the disconnection signal, the management system 30 receives INT2
Interrupt generating means 31 for generating an interrupt, and runaway monitoring means 3 for monitoring runaway of the system termination control program 40
2 and a power supply disconnecting means 33 for disconnecting the system power supply. In addition, the system termination control program 40
Includes an end processing program 41 started by an INT2 interrupt, and an execution monitoring means 42 started at the same time as the end processing program 41. The termination processing program 41 performs termination processing of the user application currently being executed, saving processing of information required for resume, and the like. Further, the runaway monitoring means 32 and the execution monitoring means 42 are respectively provided with timers for counting up to 400 msec.

Next, the operation of this embodiment will be described.
When the user turns on the power-off switch 20 to turn off the information processing apparatus 10 having the resume function, a disconnection signal is transmitted to the management system 30. This disconnection signal is received by the interrupt generating means 31, and the INT2 interrupt is generated. Further, the runaway monitoring means 32 is activated at the same time when the INT2 interrupt is generated, and the timer provided therein counts up to about 400 msec. The INT2 interrupt activates the termination processing program 41 of the system termination control program 40 and the execution monitoring means 42. In the execution monitoring means 42, the timer provided therein starts counting in synchronization with the execution of the termination processing program 41. This timer is shorter than about 400 msec (eg 3
If the termination processing program 41 is still running after the elapse of 50 msec), the execution monitoring means 42 terminates the termination processing program 41 and outputs a high level signal which is a cancel signal to the SW78 port for about 10 μsec. .
If the termination processing program 41 is terminated before that, the execution monitoring means 42 releases the interrupt without outputting a high level signal to the SW78 port.

Before the timer provided in the runaway monitoring means 32 counts about 400 msec, the execution monitoring means 4
When No. 2 outputs a high level signal to the SW78 port, the timer is reset and the processing of the runaway monitoring means 32 is stopped. Then, after about 4 msec has elapsed from the time when the level of the SW78 port output changed from the high level signal to the low level signal, the interrupt generating means 31 reactivates the I signal.
Generate an NT2 interrupt. If the execution monitoring means 42 does not output a high level to the SW78 port when the timer provided inside the runaway monitoring means 32 has passed about 400 msec, the runaway monitoring means 32 activates the power-off means 33. Then, the information processing apparatus 10 is forcibly turned off.

Next, FIG. 2 shows a circuit configuration when the management system 30 is configured by hardware. Also, the waveforms of the signals applied to and generated by this circuit are shown in FIG. The management system 30 includes a first time constant circuit 51 for delaying about 4 msec, a second time constant circuit 52 for delaying about 400 msec, AND circuits 53 and 54, and an OR circuit 5.
5, power-off instruction circuit 56, input terminals 57 to 59,
It is composed of output terminals 60 to 64. When the power disconnection switch 20 is turned on, the disconnection signal applied to the input terminal 57 changes from low level to high level. The waveform of this disconnection signal is shown in FIG. The output signal of the SW78 port from the execution monitoring means 42 is the input terminal 58.
Given to. The waveform of this signal is shown in FIG. This signal is given to the first time constant circuit 51 and becomes a signal delayed by about 4 msec. This delayed signal is given to the output terminal 60. The waveform of the signal output from the output terminal 60 is shown in FIG.
It shows in (c). The delay signal and the disconnection signal are given to the AND circuit 53, and the INT2 interrupt signal is generated. This INT2 interrupt signal is given to the output terminal 62 and the second time constant circuit 52. INT output from the output terminal 62
The waveform of the 2 interrupt signal is shown in FIG. The INT2 interrupt signal becomes a signal delayed by about 400 msec by the second time constant circuit 52, and is given to the output terminal 61 and the AND circuit 54. The waveform of the signal output from the output terminal 61 is shown in FIG. This signal is ANDed with the disconnection signal by the AND circuit 54. This output signal is given to the output terminal 63 and the logical sum circuit 55. The waveform of the signal output from the output terminal 63 is shown in FIG. further,
A power supply end instruction signal by software is given to the input terminal 59, and is given to the logical sum circuit 55 through the power supply cutoff instruction circuit 56. In the logical sum circuit 55, the logical sum of the output signal from the logical product circuit 54 and this power supply end instruction signal is taken, and it is given to the output terminal 64 as a power supply disconnection signal.

When the management system 30 is configured by hardware as described above, it operates exclusively with the system end control program 40 which is software. Therefore, no matter what kind of runaway occurs in the system termination control program 40, the management system 30 is not affected at all, so that the power can be surely cut off. Also,
Even if the management system 30 is configured by software, if the information processing apparatus has an operating system capable of completely managing the execution levels of the management system 30 and the system termination control program 40, the management system 30 may be a hardware system. As in the case of the above configuration, reliable power-off control can be performed.

Note that the power-off means 33 may reset the system and then turn off the information processing apparatus 10 without forcibly turning off the information processing apparatus 10.

[0013]

According to the information processing apparatus of the present invention, the execution monitoring means monitors the termination processing program, and when it is executed normally, sends a cancel signal to the runaway monitoring means at each reference time. The runaway monitoring means determines that the termination processing program is normally executed while the cancel signal is given. If the cancel signal is not given before the time equal to or longer than the reference time elapses, the runaway monitoring unit determines that the termination processing program is running out of control, and disconnects the system power supply.

Therefore, the system power supply can be surely cut off even when the termination processing program runs out of control or when interrupt processing cannot be performed.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of an information processing apparatus according to an embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of a management system according to an embodiment of the present invention.

3 is a signal waveform diagram in the circuit of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Information processing apparatus 20 ... Power supply disconnection switch 30 ... Management system 31 ... Interrupt generation means 32 ... Runaway monitoring means 33 ... Power supply disconnection means 40 ... System termination control program 41 ... Termination processing program 42 ... Execution monitoring means

Claims (3)

[Claims] 1. An information processing apparatus comprising: a management system that controls power-off; a system termination control program that operates under the control of the management system; and a power-off switch that gives a disconnection signal to the management system. The control program includes an end processing program started by an interrupt, and an execution monitor that is started at the same time as the start of the end processing program and sends a cancel signal to the management system if the end processing program does not end before a reference time elapses. Means is provided in the management system, power interruption means, interrupt generation means for generating an interrupt by the reception of the disconnection signal or the reception of the cancellation signal, and the execution monitoring means activated at the same time Cancellation by the time equal to or longer than the reference time No. information processing apparatus characterized by have a runaway monitoring means for activating said power down means is provided if not received. 2. The information processing apparatus according to claim 1, wherein the termination processing program performs processing for saving the state information of the system environment when the power is turned off. 3. The cancel signal continues to be transmitted to the management system for a desired time.
Or the information processing device according to 2.