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57 lines
1.2 KiB
Rust
57 lines
1.2 KiB
Rust
// arc1.rs
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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 creating 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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// Scroll down for hints :)
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use std::sync::Arc;
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use std::thread;
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fn main() {
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let numbers: Vec<_> = (0..100u32).collect();
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let shared_numbers = // TODO
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let mut joinhandles = Vec::new();
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for offset in 0..8 {
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joinhandles.push(
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thread::spawn(move || {
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let mut i = offset;
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let mut sum = 0;
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while i < child_numbers.len() {
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sum += child_numbers[i];
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i += 5;
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}
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println!("Sum of offset {} is {}", offset, sum);
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}));
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}
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for handle in joinhandles.into_iter() {
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handle.join().unwrap();
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}
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}
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// Make `shared_numbers` be an `Arc` from the numbers vector. Then, in order
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// 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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// `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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