Create Tutorials “introduction-to-cilk_for”

[behoppe]

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[behoppe]

@ailiop I created this PR to hold cilk_for work in progress. Please let me know if you're already working on a cilk_for page, or have ideas about how to pull this together. I am thinking I'll bring together an introduction to cilk_for based on existing materials, and then we can decide how to integrate with other parts of the website.

[behoppe]

@ailiop I created this PR to hold cilk_for work in progress. Please let me know if you're already working on a cilk_for page, or have ideas about how to pull this together. I am thinking I'll bring together an introduction to cilk_for based on existing materials, and then we can decide how to integrate with other parts of the website.

[behoppe]

@dcurtisatmit, based on feedback last week from Charles, have started an introduction to cilk_for. It draws quite a bit of material from the Cilk Plus Programmer's Guide. Have you been updating that part of the Guide (pp 39-44)? Please let me know, and I would love to help merge your edits with this introduction to cilk_for. Thank you.

[ailiop]

@behoppe Thank you for starting this! I will work on testing and editing the current page.

[wheatman]

The supported example under "The loop control variable must not be modified in the loop body." currently has a race.

unsigned int j;
cilk_for (unsigned int i = 1; i < 16; ++i) j = f();

This is probably fine since it is showing what the compiler supports, but maybe this should be pointed out since its not a great example to follow.

[behoppe]

@neboat I wonder if you recommend assigning anyone to this issue as a way to kick-start our documentation of cilk_for?