feature/rayon-like-parallel-execution

[Tejtex]

It adds the trait ParallelRun, which runs the tasks in parallel, without spawning a separate thread for each task.

Example:

use struct_threads::{Runnable, ParallelRun};
 
struct MathTask(i32, i32);

impl Runnable for MathTask {
  type Output = i32;

  fn run(self) -> Self::Output {
    self.0 + self.1
  }
}

let tasks = vec![MathTask(1, 2), MathTask(3, 4), MathTask(5, 6)];

let results = tasks.par_run(); // Provided by the ParallelRun trait
assert_eq!(results, vec![3, 7, 11]);

[AsfhtgkDavid]

It's interesting, but I suggest creating two methods: the first returns Vec<JoinHandler> and is non-blocking, while the second calls the first and performs a join. This would provide more options for user.

[Tejtex]

I though about it, but i dont know if this could work, because the results wouldnt be ordered and the user would have to sort it themselves.

[Tejtex]

I will make it O(N) today, without sorting.

[Tejtex]

It now returns a Result. I also added benchmarks.

[AsfhtgkDavid]

Use Vec::with_capacity(threads)

[AsfhtgkDavid]

Add .min(self.len)