SU1481776A1 - Device for checking time of program execution - Google Patents

Abstract

The invention relates to computing and can be used in systems that use computers to control the execution time of programs and monitor the health of computers in general. The purpose of the invention is to increase the reliability of the control. The device contains multiplexers 1 and 2, the elements And 3, 7 and 8, the counter 4, the one-shot 5, triggered on the falling edge, triggers 6, 9, the element NOT 10. The INVENTION ALLOWS TO DETECT ALL THE FAILURES WITH CONSEQUENCES. 2 IL.

Description

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The invention relates to computing and can be used in systems that use computers to control the runtime of programs and to monitor the operability of computers as a whole.

The purpose of the invention is to increase the reliability of the control.

FIG. a block diagram of an apparatus for monitoring the execution time is presented; in fig. 2 (a, b, c, d, d, e, g) - temporary diaphragms of the device.

The device contains (Fig. 1) the first multiplexer 1, the second multiplexer 2, the first element And 3, the counter 4, the one-oscillator 5, the first trigger on the falling edge of the first trigger 6, the third element And 7, the second element And 8, the second trigger 9, element NOT 10, input 11 of the device record, input 12 - the first information input of the device, input 13 - the second information input of the device, input 14 of the time stamp of the device.

The device works as follows.

In the initial state, when the computer (not shown) is in the "Stop" mode, the device elements must be in the following states: the counter 4 in the "O" and, accordingly, at the overflow output, the signal "O is generated," on the forward output of trigger b - the signal “Oh, and inverse“ 1, trigger 9 in “Oh, the elements And 3, 7, 8, are closed. Multiplexers 1 and 2 are configured to receive information from the computer on the inputs 11 and 13 of the device.

After transferring the computer to the mode "Operation during normal operation of the computer program, each newly initiated work program generates at the input 13 of the device a corresponding time interval code which is equal to the maximum allowed time of its execution. At the same time, a preliminary recording signal arrives at the first input of the device, which, firstly, writes the time interval code to counter 4 through multiplexers 1 and 2, secondly, through the element NOT 10 enters the zero inputs of the trigger 6 and 9 and sets them to zero. As a result, the output of the counter 4 will set the signal "1 (Fig. 2 v, 2 g), which opens the element And 3, from the output of which the input of the reverse counting" 1 of the counter 4 will start to come from the input 14 of the time stamping device (Fig. 2 but).

During normal execution of the work program, the end of its operation comes before counter 4 is reset. The work program, which is initiated next, also enters its own time interval code into the device, etc.

In the event of a computer failure on the next program being executed, its operation time may exceed the maximum permissible. In this case, the counter 4 is zeroed and, at its output, a zero signal is transmitted, which, firstly, arrives at the second input of the And 3 element,

closing it. The time stamps arriving at the input 14 of the device cease to pass to the input "-1" of the counter 4, which is in the zero state and keeps the output log signal. "Oh to those

until a new time interval code is written to it. Secondly, by a negative difference in the signals from the output of counter 4, the one-shot 5 will form at its output a single pulse of positive polarity (Fig. 2 d). By

5, the falling edge of this single pulse trigger 6 will be set to one (Fig. 2e) at the first input of the element And 7 a single signal will be set. A single pulse passing through the element And 8, firstly, with its leading edge will set the trigger 9 in one state, switching the multiplexers 1 and 2 to receive information on other inputs and generate an interrupt signal in the computer at the output of the device (Fig. 2) . This signal leads to the interruption of the looped work program of the computer. The interrupt from the device in the computer initiates an interrupt processing program that performs the actions that must restore the interrupted computational process.

0 and load the new time code into the device. Secondly, a single pulse from the output of the element And 8, passed through multiplexer 1, will go to the input of the record of counter 4 and write into it the time interval code corresponding to a specific time constant, which goes to the information input of the counter 4 from the second input of the device through the multiplexer 2 (Fig. 2 b). At the output of counter 4, Wits signal 1, which unlocks

Q element And 3 (Fig. 2 g). This will lead to the appearance of time marks at the input "-1 counter 4. The value recorded on the counter is selected so that until the moment of zeroing of counter 4, the interrupt processing program, which

5 will restore the computing process in the computer.

If the computational process is restored, then when accessing the computer to the device, first, the recording strobe from the computer arriving at the first input of the device will set the triggers 6 and 9 to the zero state, and the signal from the output of the trigger 9 will translate multiplexers 1 and 2 to receive information on their second inputs. Secondly, at the input 13 of the device, through multiplexer 2, counter 4 records a new code.

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time interval and the device continues normal operation.

Otherwise, if the interrupt handling program due to computer malfunctions or failures could not restore the computational process and write a new time interval code to counter 4, then the time determined recorded in counter 4 is constant, the output of counter 4 is “Log. “O (FIG. 2 d), which will block the 2-input element I 3, and by the negative difference of this signal, the single vibrator 5 will form a single pulse of positive polarity (FIG. 2 d). According to the negative differential of this impulse, trigger 6 is set to the zero state. In addition, this impulse, having passed through AND 7, will generate a failure signal at the first output of the device.

Claims (1)

Invention Formula A device for monitoring the execution time of programs, containing a counter, first trigger, first and second elements AND, the device’s timestamp input connected to the first input of the first AND element, inverse, the first trigger running to the first input of the second AND element, characterized in that , in order to increase the reliability of the control, the first and second multiplexers, the NOT element, the one-shot, the third AND element and the second trigger are introduced into the device, and 0 five 0 five the entry of the time code of the device is connected to the first information input of the first multiplexer and through the element NOT to the zero inputs of the first and second triggers, the output of the second trigger is connected to the control inputs of the first and second multiplexers, and is the output of the device, the first, and the second inputs setting the time codes of the device are connected respectively to the first and second information inputs of the second multiplexer, the output of which is connected to the information input of the counter, the overflow output of which is connected not with the second input of the first element And through a single vibrator with the counting input of the first trigger, with the second input of the second element And with the first input of the third element And, the output of the second element And connected to the clock input of the second trigger and the second information input of the first multiplexer , the outputs of the first multiplexer, and the first element And, are connected respectively to the recording input and the counting input of the counter, the single output of the first trigger is connected to the second input of the third And element, the output of which is the failure output y device, the information input of the second trigger is connected to the unit potential bus. MSZ data output from the computer / X CONSt / L L MS1 output five  Strobe entries from the computer g exit about counter C Single-Out output 5 g Trigger Out 8% Exit League 9 L L J F- (