Coder Social home page Coder Social logo

threadpool's People

Contributors

conorwilliams avatar developerpaul123 avatar ravenvz avatar

Stargazers

avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar avatar

Watchers

avatar avatar avatar avatar

Forkers

ravenvz francoissestier 1204601575 spkorhonen mikezackles developerpaul123 texnikos jarusunindigo

threadpool's Issues

Deadlock due to lack of cross thread signalling

Consider a series of enqueues to a thread pool with two threads: func1(), stalled_func(), func2(), wait a second, func3(). Execution of func3() will unstall stalled_func().

Since enqueue are round-robin, func1() and func2() are enqueued of Thread 1, stalled_func() and func3() on Thread 2.

After func2(), Thread 1 goes to sleep waiting to be signalled sem.acquire_many(), since _in_flight == 0. After a second, when func3() is enqueued, it is pushed to Thread 2's queue and its semaphore is signalled, but it cannot execute func3() since it is in the middle of executing stalled_func(). Thread 1 will continue to wait without stealing Thread 2's pending work.

This will cause the thread-pool to deadlock.

If this behaviour is not supported:

Execution of func3() will unstall stalled_func().

then, that's fair. It's a decent limitation for a thread pool. This behaviour happens when executing a DAG of dynamically connected tasks (e.g.: reading assets from disk). A task node can continue execution only if all its parent nodes have finished execution.

I'm opening an issue for posterity if/when anyone wants to handle this case too.

Recommend Projects

  • React photo React

    A declarative, efficient, and flexible JavaScript library for building user interfaces.

  • Vue.js photo Vue.js

    🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.

  • Typescript photo Typescript

    TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

  • TensorFlow photo TensorFlow

    An Open Source Machine Learning Framework for Everyone

  • Django photo Django

    The Web framework for perfectionists with deadlines.

  • D3 photo D3

    Bring data to life with SVG, Canvas and HTML. 📊📈🎉

Recommend Topics

  • javascript

    JavaScript (JS) is a lightweight interpreted programming language with first-class functions.

  • web

    Some thing interesting about web. New door for the world.

  • server

    A server is a program made to process requests and deliver data to clients.

  • Machine learning

    Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.

  • Game

    Some thing interesting about game, make everyone happy.

Recommend Org

  • Facebook photo Facebook

    We are working to build community through open source technology. NB: members must have two-factor auth.

  • Microsoft photo Microsoft

    Open source projects and samples from Microsoft.

  • Google photo Google

    Google ❤️ Open Source for everyone.

  • D3 photo D3

    Data-Driven Documents codes.