producer-consumer

问题 I'm trying out Multiple Producer - Multiple Consumer use case of Producer-Consumer problem. I'm using BlockingQueue for sharing common queue between multiple producers/consumers. Below is my code. Producer import java.util.concurrent.BlockingQueue; public class Producer implements Runnable { private BlockingQueue inputQueue; private static volatile int i = 0; private volatile boolean isRunning = true; public Producer(BlockingQueue q){ this.inputQueue=q; } public synchronized void run() { /

问题 So I have seen a lot of ways of implementing one consumer and many producers in Go - the classic fanIn function from the Concurrency in Go talk. What I want is a fanOut function. It takes as a parameter a channel it reads a value from and returns a slice of channels that it writes copies of this value to. Is there a correct/recommended way of implementing this? 回答1: You pretty much described the best way to do it but here is a small sample of code that does it. Go playground: https://play

问题 A consumer thread and multiple producer threads synchronize their work with a System.Collections.Concurrent.BlockingCollection<T>. The producers call blockingCollection.Add() and the consumer runs foreach (var item in blockingCollection.GetConsumingEnumerable()) {...} Now one producer wants to "flush" the buffer: The producer wants to wait until all current items have been consumed. Other producers may add further items in the meantime, but this producer is only interested in the items that

问题 I'm trying to understand how to implement a Queue with a bounded buffer size that can be used by multiple producers and consumers using Python Semaphores. Here's my implementation: class Q: def __init__(self, size): self.buff = [None]*size self.end = 0 self.start = 0 self.size = size self.end_lock = Lock() # protect end from race across multiple producers self.start_lock = Lock() # protect start from race across multiple consumers self.open = Semaphore(size) # block till there's space to

问题 I am working on a simple producer-consumer problem, using OpenMP in C. My program creates 4 threads, two of which are consumers and two producers. Each producer places a character in a buffer, and the consumers just print the character. My aim is to synchronize the producers/consumers so that each producer will produce the next in order character of the alphabet and each consumer will print the next in order character that is placed in the buffer. This is my code: #include <stdio.h> #include

问题 I have a producer sending durable messages to a RabbitMQ exchange. If the RabbitMQ memory or disk exceeds the watermark threshold, RabbitMQ will block my producer. The documentation says that it stops reading from the socket, and also pauses heartbeats. What I would like is a way to know in my producer code that I have been blocked. Currently, even with a heartbeat enabled, everything just pauses forever. I'd like to receive some sort of exception so that I know I've been blocked and I can

问题 The following question is about the unity game engine, but it could relate to any program trying to send data to a main thread, such as the UI thread. I am processing some data on a separate thread (position data a read asyncrously from a socket). However, I need to act on this data on the main thread (a game object's transform can only be accessed from the main thread). The approach I have in mind is to create a thread-safe queue and follow the producer-consumer pattern. The thread would

问题 I wish to figure out how to create a multithreaded producer/consumer program where producing is based on an external event. I have built a synchronized queue having 2 thread loops, one to enqueue and one to dequeue and write into a file, with classic pattern: Class SyncQueue { ... producerThread = new Thread(new ThreadStart(StartProducer)); consumerThread = new Thread(new ThreadStart(StartConsumer)); ... public void Start() { producerThread.Start(); consumerThread.Start(); } public void

问题 I am facing an issue while consuming message using the bootstrap-server i.e. Kafka server. Any idea why is it not able to consume messages without zookeeper? Kafka Version: kafka_2.11-1.0.0 Zookeeper Version: kafka_2.11-1.0.0 Zookeeper Host and port: zkp02.mp.com:2181 Kafka Host and port: kfk03.mp.com:9092 Producing some message: [kfk03.mp.com ~]$ /bnsf/kafka/bin/kafka-console-producer.sh --broker-list kfk03.mp.com:9092 --topic test >hi >hi Consumer not able to consume messages if I give –

问题 Searched hard for a piece of code which does what i want and i am happy with. Reading this and this helped a lot. I have a scenario where i need a single consumer to be notified by a single producer when new data is available but would also like the consumer to be notified periodically regardless of if new data is available. It is fine if the consumer is notified more than the reoccurring period but it should not be notified less frequent. It is possible that multiple notifications for 'new