feat(arc1): Add more details to description and hint (#710)
Co-authored-by: bmacer <bmacer@cisco.com> Co-authored-by: marisa <mokou@fastmail.com> Co-authored-by: Roberto Vidal <vidal.roberto.j@gmail.com>
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@ -1,7 +1,21 @@
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// arc1.rs
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// arc1.rs
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// In this exercise, we are given a Vec of u32 called "numbers" with values ranging
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// from 0 to 99 -- [ 0, 1, 2, ..., 98, 99 ]
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// We would like to use this set of numbers within 8 different threads simultaneously.
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// Each thread is going to get the sum of every eighth value, with an offset.
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// The first thread (offset 0), will sum 0, 8, 16, ...
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// The second thread (offset 1), will sum 1, 9, 17, ...
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// The third thread (offset 2), will sum 2, 10, 18, ...
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// ...
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// The eighth thread (offset 7), will sum 7, 15, 23, ...
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// Because we are using threads, our values need to be thread-safe. Therefore,
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// we are using Arc. We need to make a change in each of the two TODOs.
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// Make this code compile by filling in a value for `shared_numbers` where the
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// Make this code compile by filling in a value for `shared_numbers` where the
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// TODO comment is and create an initial binding for `child_numbers`
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// first TODO comment is, and create an initial binding for `child_numbers`
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// somewhere. Try not to create any copies of the `numbers` Vec!
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// where the second TODO comment is. Try not to create any copies of the `numbers` Vec!
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// Execute `rustlings hint arc1` for hints :)
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// Execute `rustlings hint arc1` for hints :)
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// I AM NOT DONE
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// I AM NOT DONE
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@ -16,6 +30,7 @@ fn main() {
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let mut joinhandles = Vec::new();
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let mut joinhandles = Vec::new();
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for offset in 0..8 {
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for offset in 0..8 {
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let child_numbers = // TODO
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joinhandles.push(thread::spawn(move || {
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joinhandles.push(thread::spawn(move || {
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let mut i = offset;
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let mut i = offset;
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let mut sum = 0;
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let mut sum = 0;
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@ -679,7 +679,12 @@ to avoid creating a copy of `numbers`, you'll need to create `child_numbers`
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inside the loop but still in the main thread.
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inside the loop but still in the main thread.
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`child_numbers` should be a clone of the Arc of the numbers instead of a
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`child_numbers` should be a clone of the Arc of the numbers instead of a
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thread-local copy of the numbers."""
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thread-local copy of the numbers.
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This is a simple exercise if you understand the underlying concepts, but if this
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is too much of a struggle, consider reading through all of Chapter 16 in the book:
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https://doc.rust-lang.org/stable/book/ch16-00-concurrency.html
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"""
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[[exercises]]
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[[exercises]]
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name = "iterators1"
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name = "iterators1"
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