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Does the semaphore solution work for multiple producer consumer?

By : Tanvi Aman
Date : October 17 2020, 08:10 AM
like below fixes the issue Your example experiences race conditions. You really need something along the lines of condition variables. There is no way using just semaphores to ensure that multiple producers are not writing to a full buffer or that multiple consumers are not reading from an empty buffer.
The single producer, single consumer model simply blocks the consumer until the producer acts, then blocks the producer until the consumer acts. There is no indication if the shared buffer is empty or full. Note that the semaphore count is not the same as the full or empty condition of the buffer.
code :

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Semaphore On Multiple Producer Single Consumer Problem

By : Janice Schmitz
Date : March 29 2020, 07:55 AM
Does that help There are many ways to write such a queue. For example, you could use a mutex and a condition variable as in my example at http://www.justsoftwaresolutions.co.uk/threading/implementing-a-thread-safe-queue-using-condition-variables.html
Herb Sutter discusses queues in his articles at Dr Dobb's. See http://www.drdobbs.com/high-performance-computing/211601363 and http://www.drdobbs.com/high-performance-computing/210604448

one-producer and multiple consumer : should I use N semaphore if there are N consumers and N types of products

By : Santiago Gusman
Date : March 29 2020, 07:55 AM
Does that help This seems like a design that isn't going to scale well. If you have 1,000 different products, then you'll have 1,000 different FIFO queues, 1,000 semaphores, and 1,000 threads running. This is going to be nearly impossible to manage.
You'd be better off with a single queue and a small number of threads. The threads can handle any type of item. Your only difficulty will be delivering items to the customer in order, but that won't normally be a problem. To solve it, all you need to do is add a sequence number of some sort so that when an item is about to be sent to the customer, you check the sequence number and wait if it's not the one you expect.

Producer/Consumer: One Producer, multiple Consumer, each work on same data

By : J. Rood
Date : March 29 2020, 07:55 AM
will be helpful for those in need Take a look at Guava's EventBus, a part of Guava's library that deals with in-process PubSub-style communication. It might suit your needs and save you from re-inventing some wheel.
If you are looking for interprocess communication, consider a message queue just like Evgeniy proposed.

Producer-consumer using semaphore in C

By : akshay
Date : March 29 2020, 07:55 AM
Hope that helps The problem is that your main thread runs to the point where it displays the data that the consumer thread is supposed to "return". But there's no synchronization between the main tread and the consumer.
the easiest solution (that still uses threads) is to have the main thread join the consumer thread - that's how it can know the consumer has completed its work. Instead of a call to sleep, try:
code :
pthread_join(con_t, NULL);

C solution for producer-consumer with only ONE semaphore

By : Rahul
Date : March 29 2020, 07:55 AM
hop of those help? The reason you need two semaphores is that the producer cannot do anything when the "bin" or whatever the producer and consumer are sharing is full, but the consumer cannot do anything when the bin is empty.
Therefore, the producer needs to have a semaphore for full and the consumer one for empty.
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