async-mutex | A mutex for synchronizing async workflows in Javascript | Reactive Programming library
kandi X-RAY | async-mutex Summary
kandi X-RAY | async-mutex Summary
This package implements primitives for synchronizing asynchronous operations in Javascript.
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QUESTION
I am using [async-mutex](https://github.com/DirtyHairy/async-mutex because there is a race condition in my code from concurrent requests returning. And upon all of the concurrent requests resolving, they each need to add something from the response into a state array.
I have included a codesandbox replicating this issue: https://codesandbox.io/s/runtime-haze-2407uy
I will also post the code here for reference:
...ANSWER
Answered 2022-Mar-28 at 06:27The reason for this is because the "state" (no pun intended) of the stuff state is uncertain at the time of running setState, due to the nature of setStuff and state setters in general being asynchronous.
The solution is to
a) use await because in any case the mutex lock acquisition is a promise
b) pass a lambda function into setStuff that guarantees the state of stuff will be up to date, as opposed to just assuming stuff will be up to date (which it won't be)
QUESTION
I'm writing an HTTP API with expressjs in Node.js and here is what I'm trying to achieve:
- I have a regular task that I would like to run regularly, approx every minute. This task is implemented with an async function named
task. - In reaction to a call in my API I would like to have that task called immediately as well
- Two executions of the
taskfunction must not be concurrent. Each execution should run to completion before another execution is started.
The code looks like this:
...ANSWER
Answered 2021-Oct-08 at 02:29Here's a version using RxJS#Subject that is almost working. How to finish it depends on your use-case.
QUESTION
I want to be sure that a block of code doesn't run concurrently. The async-Mutex library doesn't seem to be working for me though. Here's a minimal replication:
...ANSWER
Answered 2021-Jan-07 at 06:41The problem is most likely caused because mutex is allocated on every re-render, giving you a new instance.
You could move the
const mutex = new Mutex();out of your component, giving you one global version for all of your Timer components, means that Timers could block each other.You could make the mutex instance stable throughout re-renders by wrapping it in a
React.useMemohook, this would have every Timer component have it's own mutex, which means that Timers could not block each other, only itself.
Replace your declaration inside your component with:
QUESTION
I'm having an issue with upgrading from Webpack 4 to Webpack 5, where Babel no longer seems to transpile code from one of my dependencies (async-mutex). I managed to strip it down to a minimal setup that demonstrates the problem:
package.json
...ANSWER
Answered 2020-Dec-17 at 20:47You'll need to include async-mutex in your webpack.config.js's module rule for babel. Once in awhile you'll come across a package that doesn't transform its ES6. Funny enough, the best way to include it in your transpilation is using exclude, like this:
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