IB Computer Science Topic A1.3.4 Evaluation of Polling and Interrupt Handling Revision Notes (SL/HL)

IB Computer Science Topic A1.3.4 Evaluation of Polling and Interrupt Handling Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

Understanding Polling and Interrupt Handling

Definition

Polling

Polling is a technique where the CPU repeatedly checks the status of a device at regular intervals to see if it needs attention.

Definition

Interrupt Handling

Interrupt Handling involves a device sending a signal to the CPU, causing it to pause its current task and execute a specific routine to address the event.

Analogy

Note

Polling is like a teacher constantly checking if students have questions, while interrupts are like students raising their hands when they need help.

Factors to Consider

Event Frequency
1. High Frequency: Interrupts are preferred to ensure timely responses.
2. Low Frequency: Polling can be sufficient, reducing complexity.
CPU Processing Overheads
1. Interrupts: Introduce overhead by saving and restoring CPU state.
2. Polling: Consumes CPU cycles continuously, potentially reducing efficiency.
Power Source
1. Battery-Powered Devices: Interrupts are more efficient, allowing the CPU to enter low-power states.
2. Mains-Powered Devices: Polling may be acceptable due to less concern about power consumption.
Event Predictability
1. Predictable Events: Polling can be scheduled efficiently.
2. Unpredictable Events: Interrupts ensure immediate response.
Controlled Latency
1. Interrupts: Provide lower and more predictable latency.
2. Polling: May introduce variable latency depending on the polling interval.
Security Concerns
1. Interrupts: Can be exploited for denial-of-service attacks if not managed properly.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

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Note

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Excepteur sint occaecat cupidatat non proident

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Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Understanding Polling and Interrupt Handling

Definition

Polling

Polling is a technique where the CPU repeatedly checks the status of a device at regular intervals to see if it needs attention.

Definition

Interrupt Handling

Interrupt Handling involves a device sending a signal to the CPU, causing it to pause its current task and execute a specific routine to address the event.

Analogy

Note

Polling is like a teacher constantly checking if students have questions, while interrupts are like students raising their hands when they need help.

Factors to Consider

Event Frequency
1. High Frequency: Interrupts are preferred to ensure timely responses.
2. Low Frequency: Polling can be sufficient, reducing complexity.
CPU Processing Overheads
1. Interrupts: Introduce overhead by saving and restoring CPU state.
2. Polling: Consumes CPU cycles continuously, potentially reducing efficiency.
Power Source
1. Battery-Powered Devices: Interrupts are more efficient, allowing the CPU to enter low-power states.
2. Mains-Powered Devices: Polling may be acceptable due to less concern about power consumption.
Event Predictability
1. Predictable Events: Polling can be scheduled efficiently.
2. Unpredictable Events: Interrupts ensure immediate response.
Controlled Latency
1. Interrupts: Provide lower and more predictable latency.
2. Polling: May introduce variable latency depending on the polling interval.
Security Concerns
1. Interrupts: Can be exploited for denial-of-service attacks if not managed properly.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A1 Computer fundamentals4 subtopics

A2 Networks4 subtopics

A3 Databases4 subtopics

A4 Machine learning4 subtopics

B1 Computational thinking1 subtopic

B2 Programming5 subtopics

B3 Object-oriented programming2 subtopics

B4 Abstract data types (HL only)1 subtopic

IB Computer Science Topic A1.3.4: Evaluation of Polling and Interrupt Handling Notes

A1 Computer fundamentals4 subtopics

A2 Networks4 subtopics

A3 Databases4 subtopics

A4 Machine learning4 subtopics

B1 Computational thinking1 subtopic

B2 Programming5 subtopics

B3 Object-oriented programming2 subtopics

B4 Abstract data types (HL only)1 subtopic

Understanding Polling and Interrupt Handling

Factors to Consider

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Understanding Polling and Interrupt Handling

Factors to Consider

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account