[Solved] Rust thread errors

help
1

There are 2 errors in this code:

 let _ks = partition_data(num_partitions,&v);`
 let mut vc : Vec<usize> = Vec::new();` 
 for i in 0..num_partitions{ 
     let p2 = _ks[i].clone(); 
     let tt2 = thread::spawn(move || {map_data(&p2)}); 
     vc.push(tt2)
 } 
 for entry in vc{` 
    intermediate_sums.push(entry.join().unwrap());` 
 }

The first one is with ttt2 in 'vv.push(tt2)' expected usize, found struct std::thread::JoinHandle
The second one is .join in 'intermediate_sums.push(entry.join().unwrap());'

I've tried to google anything that could help, but still was stuck. I'm grateful for any help and pointers since this is the first time I'm coding in rust.

2

Can you post the exact error message? Also please put code between ```rust and ```.

2 Likes
3

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1 Like
4

Sure Thanks for telling me!

5

Thank you! It was my mistake from the beginning that I couldn't seem to find the symbol on the keyboard... I ended up trying to use the ' single quotation mark and I didn't see anything happen, so I ended up removing them

6

(I'm assuming you meant vc.push(tt2).)
The problem is that vc is declared as a vector of usize:

let mut vc : Vec<usize> = Vec::new();

But tt2 is a std::thread::JoinHandle:

let tt2 = thread::spawn(move || {map_data(&p2)});

You can fix this by giving vc the correct type:

let mut vc: Vec<JoinHandle<_>> = Vec::new();

Or more easily by simply omitting the type and letting the compiler figure it out based on how it's used:

let mut vc = Vec::new();

You didn't paste the error message, but it's probably another symptom of the same problem. Since vc is declared as a Vec<usize>, the compiler thinks entry is a usize, not a JoinHandle.

1 Like
7

Seemed to fix both errors :laughing: Thank you so much!! I really appreciate your help!

9

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