XML CO538 Anonymous Questions and Answers Keyword Index

This page provides a keyword index to questions and answers. Clicking on a keyword will take you to a page containing all questions and answers for that keyword, grouped by year.

To submit a question, use the anonymous questions page. You may find the keyword index and/or top-level index useful for locating past questions and answers.

Keyword reference for suspend

Question 36 (2003):

To suspend screen output, would directing the `out.int' and `out.string' to a `black.hole' be appropriate ? I have tried this but it doesn't seem to work, am I going in the right direction or completely off.

Answer 36:

Re-directing the output to a `black.hole' won't suspend it -- it'll gobble it up, like a black-hole. To suspend the output you need to stop the flow of data, which is often simpler than re-directing it. See the model answer for question 3 (on raptor) for an idea of how to do this.

Keywords: q4 , suspend

Question 32 (2000):

When implementing the response to an `s' being pressed should it either:

• freeze the system, so when `s' is pressed again it continues from where it was at when the first `s' was pressed;
• or just stop outputing the data to the screen - i.e. in the background, it continues to count and, when `s' is next pressed, it starts the screen again?

Answer 32:

The former - see the answer to Question 26 (2000).

Keywords: q4 , suspend

Question 26 (2000):

In Q4, when you say `suspends output to the screen', do you mean the processes should keep going and not output anything to the screen, or pause and wait until they are allowed to continue?

Answer 26:

The latter - the processes should become blocked until output is allowed back through to the screen. Don't modify those processes in any way to get this functionalty. Do it the same way you did it for question 3 from the Execrcise Sheet (which was considered in your seminar groups).

Keywords: q4 , suspend

Referrers: Question 32 (2000)