Add program to calculate primes

.gitignore

@@ -0,0 +1,5 @@
+/target
+**/*.rs.bk
+primes.txt
+*.tar.gz
+.idea

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Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "primes"
+version = "0.1.0"
+authors = ["trivernis <trivernis@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+num_cpus = "1.0"
+may = "0.3.16"

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020 parallel-programming-hwr
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

src/main.rs

@@ -0,0 +1,88 @@
+use may::go;
+use may::sync::mpmc::{channel, Sender};
+use num_cpus;
+use std::env;
+use std::fs::OpenOptions;
+use std::io::prelude::*;
+use std::io::BufWriter;
+use std::time::Instant;
+
+fn main() {
+    may::config().set_workers(num_cpus::get());
+    let (tx, rx) = channel::<u64>();
+    let num_threads: u16 = num_cpus::get() as u16;
+    let mut start: u64 = 1;
+    let args: Vec<String> = env::args().collect();
+    if args.len() > 1 {
+        start = args[1].parse::<u64>().unwrap();
+    }
+    if &start % 2 == 0 {
+        start += 1;
+    }
+    let file = OpenOptions::new()
+        .write(true)
+        .append(true)
+        .create(true)
+        .open("primes.txt")
+        .unwrap();
+    let mut buffer = BufWriter::new(file);
+    println!("Starting {} threads", num_threads);
+    for i in 0u16..num_threads {
+        let tx = tx.clone();
+        go!(move || {
+            get_primes(start + (2 * &i) as u64, (&num_threads * 2) as u64, 2_000_000, &tx);
+        });
+        println!("Started thread {}", i);
+    }
+    let time_start = Instant::now();
+    let mut prime_count = 0;
+    let mut primes: Vec<u64> = vec![];
+    // receives all prime numbers via the channel receiver.
+    // The received prime numbers are stored in a vector
+    loop {
+        let result = rx.recv();
+        match result {
+            Err(_) => break,
+            Ok(prime) => {
+                prime_count += 1;
+                primes.push(prime);
+                println!("\r{: <30}", prime);
+                print!(
+                    "{} Primes/s",
+                    prime_count as f64 / time_start.elapsed().as_secs_f64()
+                );
+                if let Err(e) = buffer.write(&format!("{}\n", prime).into_bytes()) {
+                    panic!(e);
+                }
+            }
+        }
+    }
+    let mut prime_sum: u128 = 0;
+    for prime in primes {
+        prime_sum += prime as u128;
+    }
+    println!("Prime Sum: {}", prime_sum);
+}
+
+/// Calculates primes and increases by incr with every iteration
+/// Resulting prime numbers are sent via the tx sender.
+fn get_primes(start: u64, incr: u64, stop_after: u64, tx: &Sender<u64>) {
+    println!("Hi, I'm a thread.");
+    let mut num = start;
+    while num < stop_after {
+        let mut is_prime = true;
+        if (num < 3) | (&num % 2 == 0) {
+            num += incr;
+            continue;
+        }
+        for i in (3u64..&num / 2).step_by(2) {
+            if num % i == 0 {
+                is_prime = false;
+            }
+        }
+        if is_prime {
+            tx.send(num).unwrap();
+        }
+        num += incr;
+    }
+}