5 changed files with 310 additions and 0 deletions
@ -0,0 +1,197 @@ |
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# This file is automatically @generated by Cargo. |
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# It is not intended for manual editing. |
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version = 3 |
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|
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|
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[[package]] |
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name = "condvartest" |
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version = "0.1.0" |
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dependencies = [ |
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"crossbeam", |
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"rand", |
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] |
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|
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[[package]] |
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|
name = "crossbeam" |
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dependencies = [ |
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|
"crossbeam-channel", |
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"crossbeam-deque", |
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"crossbeam-epoch", |
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"crossbeam-queue", |
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"crossbeam-utils", |
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] |
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|
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[[package]] |
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name = "crossbeam-channel" |
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dependencies = [ |
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"crossbeam-utils", |
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] |
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name = "crossbeam-deque" |
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"crossbeam-epoch", |
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"crossbeam-utils", |
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"crossbeam-utils", |
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"crossbeam-utils", |
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] |
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name = "crossbeam-utils" |
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"cfg-if", |
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"libc", |
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"rand_core", |
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"rand_core", |
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"getrandom", |
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] |
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[[package]] |
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"proc-macro2", |
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"quote", |
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"unicode-ident", |
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] |
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name = "unicode-ident" |
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name = "wasi" |
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[[package]] |
||||||
|
name = "zerocopy" |
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version = "0.7.35" |
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source = "registry+https://github.com/rust-lang/crates.io-index" |
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|
dependencies = [ |
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|
"byteorder", |
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|
"zerocopy-derive", |
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|
] |
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|
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[[package]] |
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|
name = "zerocopy-derive" |
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|
version = "0.7.35" |
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|
source = "registry+https://github.com/rust-lang/crates.io-index" |
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checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e" |
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|
dependencies = [ |
||||||
|
"proc-macro2", |
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|
"quote", |
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|
"syn", |
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] |
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@ -0,0 +1,8 @@ |
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|
[package] |
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|
name = "condvartest" |
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|
version = "0.1.0" |
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edition = "2021" |
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|
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[dependencies] |
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crossbeam = "0.8.4" |
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rand = "0.8.5" |
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@ -0,0 +1,3 @@ |
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# CondVarTest |
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Playing a bit with a condition variable, which carries a value instead of a bool. |
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@ -0,0 +1,39 @@ |
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use std::sync::{ |
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atomic::{AtomicUsize, Ordering}, |
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Condvar, Mutex, |
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}; |
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|
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pub struct Beacon { |
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lock: Mutex<AtomicUsize>, |
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guard: Condvar, |
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} |
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impl Beacon { |
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pub fn new(leases: usize) -> Self { |
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Self { |
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lock: Mutex::new(AtomicUsize::new(leases)), |
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guard: Condvar::new(), |
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} |
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} |
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|
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pub fn lease(&self, leases: usize) { |
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let mut control = self.lock.lock().unwrap(); |
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let mut current_leases = control.load(Ordering::Relaxed); |
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println!("Need {leases} out of {current_leases}"); |
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while current_leases < leases { |
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println!("Not enough, waiting..."); |
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control = self.guard.wait(control).unwrap(); |
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current_leases = control.load(Ordering::Relaxed); |
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println!("Need {leases} our of {current_leases}"); |
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} |
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control.fetch_sub(leases, Ordering::SeqCst); |
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} |
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pub fn release(&self, leases: usize) { |
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println!("Releasing {leases} leases"); |
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let control = self.lock.lock().unwrap(); |
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control.fetch_add(leases, Ordering::SeqCst); |
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self.guard.notify_all(); |
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} |
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} |
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@ -0,0 +1,63 @@ |
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mod beacon; |
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|
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use std::sync::atomic::AtomicUsize; |
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use std::sync::atomic::Ordering; |
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use std::sync::Arc; |
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use std::sync::Condvar; |
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use std::sync::Mutex; |
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use std::time::Duration; |
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|
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use beacon::Beacon; |
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use crossbeam::channel::unbounded; |
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use rand::thread_rng; |
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use rand::Rng; |
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|
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fn main() { |
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let semaphore = Arc::new(Beacon::new(10)); |
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let (send, receive) = unbounded(); |
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let mut waits = Vec::new(); |
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for i in 0..3 { |
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let thread_recv = receive.clone(); |
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let thread_semaphore = Arc::clone(&semaphore); |
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waits.push(std::thread::spawn(move || { |
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let me = i; |
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let mut sum = 0; |
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while let Ok(value) = thread_recv.recv() { |
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println!("{me} Got value: {value}"); |
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thread_semaphore.lease(value); |
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let duration = Duration::new(value as u64, 0); |
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std::thread::sleep(duration); |
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sum += value; |
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thread_semaphore.release(value); |
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} |
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println!("{me} completed with a total of {sum}"); |
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sum |
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})); |
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} |
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drop(receive); |
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println!("Sending messages:"); |
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let mut rng = thread_rng(); |
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let mut produced = 0; |
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for i in 0..12 { |
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let value = rng.gen_range(1..11); |
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println!("{i}: produced value {value}"); |
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send.send(value).expect("Failed to send number"); |
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produced += value; |
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} |
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drop(send); // breaks the sender
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println!("Produced a total of {produced}"); |
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let mut total_result = 0; |
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for handle in waits { |
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let thread_result = handle.join().unwrap(); |
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total_result += thread_result; |
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} |
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println!("Threads consumed {total_result}"); |
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} |
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Loading…
Reference in new issue