better practice for callback in POWSolver.solve_blocking

examples/multithreaded/Cargo.lock

@@ -33,6 +33,19 @@ dependencies = [
  "inout",
 ]
 
+[[package]]
+name = "console"
+version = "0.15.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c926e00cc70edefdc64d3a5ff31cc65bb97a3460097762bd23afb4d8145fccf8"
+dependencies = [
+ "encode_unicode",
+ "lazy_static",
+ "libc",
+ "unicode-width",
+ "windows-sys",
+]
+
 [[package]]
 name = "cpufeatures"
 version = "0.2.9"
@@ -63,6 +76,12 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "encode_unicode"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a357d28ed41a50f9c765dbfe56cbc04a64e53e5fc58ba79fbc34c10ef3df831f"
+
 [[package]]
 name = "generic-array"
 version = "0.14.7"
@@ -93,6 +112,19 @@ dependencies = [
  "digest",
 ]
 
+[[package]]
+name = "indicatif"
+version = "0.17.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ff8cc23a7393a397ed1d7f56e6365cba772aba9f9912ab968b03043c395d057"
+dependencies = [
+ "console",
+ "instant",
+ "number_prefix",
+ "portable-atomic",
+ "unicode-width",
+]
+
 [[package]]
 name = "inout"
 version = "0.1.3"
@@ -102,12 +134,33 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "instant"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a5bbe824c507c5da5956355e86a746d82e0e1464f65d862cc5e71da70e94b2c"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
 [[package]]
 name = "libc"
 version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
+[[package]]
+name = "number_prefix"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "830b246a0e5f20af87141b25c173cd1b609bd7779a4617d6ec582abaf90870f3"
+
 [[package]]
 name = "password-hash"
 version = "0.5.0"
@@ -129,6 +182,12 @@ dependencies = [
  "hmac",
 ]
 
+[[package]]
+name = "portable-atomic"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f32154ba0af3a075eefa1eda8bb414ee928f62303a54ea85b8d6638ff1a6ee9e"
+
 [[package]]
 name = "powlib"
 version = "0.1.0"
@@ -141,6 +200,7 @@ dependencies = [
 name = "powlib-multithreaded-example"
 version = "0.0.1"
 dependencies = [
+ "indicatif",
  "powlib",
 ]
 
@@ -224,6 +284,12 @@ version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "497961ef93d974e23eb6f433eb5fe1b7930b659f06d12dec6fc44a8f554c0bba"
 
+[[package]]
+name = "unicode-width"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
+
 [[package]]
 name = "version_check"
 version = "0.9.4"
@@ -235,3 +301,69 @@ name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
+[[package]]
+name = "windows-sys"
+version = "0.45.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75283be5efb2831d37ea142365f009c02ec203cd29a3ebecbc093d52315b66d0"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e5180c00cd44c9b1c88adb3693291f1cd93605ded80c250a75d472756b4d071"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"

examples/multithreaded/Cargo.toml

@@ -5,4 +5,5 @@ edition = "2021"
 publish = false
 
 [dependencies]
+indicatif = "0.17.5"
 powlib = { path = '../..' }

examples/multithreaded/src/main.rs

@@ -1,8 +1,25 @@
 
+use std::time::Instant;
+
+use indicatif::ProgressBar;
 use powlib::{gen::{POWRange, POWChallenge}, solver::POWSolver};
 
 fn main() {
-    let challenge = POWChallenge::make(POWRange::new(0, 20480));
+    let challenge = POWChallenge::make(POWRange::new(0, 204800));
     let mut solver = POWSolver::new(challenge);
-    println!("Found {} with 8 threads", solver.solve_blocking(8, Some(|x| println!("{x}"))));
+    let mut count = 0;
+
+    let progess = ProgressBar::new(204800);
+    let thr_progress = progess.clone();
+
+    let time = Instant::now();
+
+    let result = solver.solve_blocking(16, Some(move |_| {
+        thr_progress.set_position(count);
+        count += 1;
+    }));
+
+    progess.finish();
+
+    println!("Found {result} in {} ms", time.elapsed().as_secs_f32());
 }

src/solver.rs

@@ -1,4 +1,4 @@
-use std::{sync::{mpsc, Arc, atomic::{AtomicBool, Ordering}}, thread::{self, JoinHandle}};
+use std::{sync::{mpsc, Arc, atomic::{AtomicBool, Ordering}}, thread::{self, JoinHandle}, time::Duration};
 
 use crate::{gen::POWChallenge, num::Num};
 
@@ -8,6 +8,11 @@ pub struct POWSolver {
     result: Option<u128>
 }
 
+enum SolverThreadMessage {
+    PlainNumber(u128),
+    Found(u128)
+}
+
 impl POWSolver {
 
     /**
@@ -74,8 +79,8 @@ impl POWSolver {
 
        This method also supports callbacks via `Option`
      */
-    pub fn solve_blocking(self: &mut POWSolver, threads: u8, callback: Option<fn(u128)>) -> u128 {
+    pub fn solve_blocking(self: &mut POWSolver, threads: u8, mut callback: Option<impl FnMut(u128)>) -> u128 {
-        let (send, recv) = mpsc::sync_channel::<u128>(1);
+        let (send, recv) = mpsc::sync_channel::<SolverThreadMessage>(1);
         let mut thread_start: u128 = self.challenge.range.min;
 
         let size = self.chunksize(threads);
@@ -97,26 +102,38 @@ impl POWSolver {
                 thread::spawn(move || {
                     for j in thread_start..end {
                         if stop.load(Ordering::Relaxed) { break }
-                            if callback.is_some() {
-                                callback.unwrap()(j);
-                            }
 
                         if solver.challenge.check(Num::from(j as u128)) {
                             stop.store(true, Ordering::Relaxed);
-                                send.send(j as u128).unwrap();
+                            send.send(SolverThreadMessage::Found(j)).unwrap();
+                        } else {
+                            send.send(SolverThreadMessage::PlainNumber(j)).unwrap();
                         }
                     }
-                    }
+                })
-                )
             );
 
             thread_start = thread_start + size + 1;
         }
 
-        let result = recv.recv().unwrap();
+        let mut result = 0;
-        stop.load(Ordering::Relaxed);
 
         loop {
+            let status = recv.recv().unwrap();
+            match status {
+                SolverThreadMessage::PlainNumber(num) => {
+                    if callback.is_some() {
+                        callback.as_mut().unwrap()(num);
+                    }
+                },
+                SolverThreadMessage::Found(num) => {
+                    result = num;
+                    stop.store(true, Ordering::Relaxed);
+                    break;
+                }
+            }
+
+            if stop.load(Ordering::Relaxed) {
                 let mut all_finished = true;
                 for handle in handles.iter() {
                     if !handle.is_finished() {
@@ -125,6 +142,7 @@ impl POWSolver {
                 }
                 if all_finished { break }
             }
+        }
 
         self.result = Some(result);