waker | Wake someone up! | Automation library
kandi X-RAY | waker Summary
kandi X-RAY | waker Summary
Wake someone up!
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Trending Discussions on waker
QUESTION
In my browser application, two closures access data stored in a Rc>. One closure mutably borrows the data, while the other immutably borrows it. The two closures are invoked independently of one another, and this will occasionally result in a BorrowError or BorrowMutError.
Here is my attempt at an MWE, though it uses a future to artificially inflate the likelihood of the error occurring:
...ANSWER
Answered 2021-Apr-03 at 23:50Think about this problem independently of Rust's borrow semantics. You have a long-running operation that's updating some shared state.
How would you do it if you were using threads? You would put the shared state behind a lock.
RefCellis like a lock except that you can't block on unlocking it — but you can emulate blocking by using some kind of message-passing to wake up the reader.How would you do it if you were using pure JavaScript? You don't automatically have anything like RefCell, so either:
- The state can be safely read while the operation is still ongoing (in a concurrency-not-parallelism sense): in this case, emulate that by not holding a single
RefMut(result ofborrow_mut()) alive across anawaitboundary. - The state is not safe to be read: you'd either write something lock-like as described above, or perhaps arrange so that it's only written once when the operation is done, and until then, the long-running operation has its own private state not shared with the rest of the application (so there can be no
BorrowErrorconflicts).
- The state can be safely read while the operation is still ongoing (in a concurrency-not-parallelism sense): in this case, emulate that by not holding a single
Think about what your application actually needs and pick a suitable solution. Implementing any of these solutions will most likely involve having additional interior-mutable objects used for communication.
QUESTION
I have implemented a localization algorithm with 4 nodes topology and it is working fine but in the log file I am getting this error and I am not able to understand where the problem is. The algorithm gets stuck for sometime and this error appears and after that it again resumes the normal flow.how to remove this error ?
...ANSWER
Answered 2021-Apr-01 at 17:06I ran your simulation using the code you provided and managed to reproduce the error. Tracing through the logs, I found that the error occurred on the third motion update for node B, whereas your simulation script only seemed to have 2 legs in the motion model. That gave me a hint as to what the problem was.
Your motion model states:
QUESTION
I'm trying to share an Arc> with a closure. I get the error that closure is FnOncebecause it moves the variableshared_wake_deque_ out of its environment:
ANSWER
Answered 2021-Mar-07 at 02:07Because you have
QUESTION
Rust's future uses poll_read (poll_read) to poll for available data:
ANSWER
Answered 2021-Mar-06 at 17:07You do not need to do anything. The documentation reads:
If no data is available for reading, the method returns
Poll::Pendingand arranges for the current task to receive a notification when the object becomes readable or is closed.
It does not need to arrange to be woken up if it returns data. The implementation for Cursor, for example, just defers to io::Read and ignores the Context entirely, regardless whether the buffer is big enough or not.
The poller should know that there still may be data to read until poll_read returns Poll::Ready(Ok(0)).
QUESTION
I am finding it difficult to understand why and when I need to explicitly do something with the Context and/or its Waker passed to the poll method on an object for which I am implementing Future. I have been reading the documentation from Tokio and the Async Book, but I feel the examples/methods are too abstract to be applied to real problems.
For example, I would have thought the following MRE would deadlock since the future generated by new_inner_task would not know when a message has been passed on the MPSC channel, however, this example seems to work fine. Why is this the case?
ANSWER
Answered 2021-Feb-11 at 11:50You are passing the same Context (and thus Waker) to the poll() method of the Future returned by new_inner_task, which passes it down the chain to the poll() of the Future returned by UnboundedReceiverStream::next(). The implementation of that arranges to call wake() on this Waker at the appropriate time (when new elements appear in the channel). When that is done, Tokio polls the top-level future associated with this Waker - the join!() of the three futures.
If you omitted the line that polls the inner task and just returned Poll::Pending instead, you would get the expected situation, where your Future would be polled once and then "hang" forever, as nothing would wake it again.
QUESTION
I have a problem about implementing recommendation system by using Euclidean Distance.
What I want to do is to list some close games with respect to search criteria by game title and genre.
Here is my project link : Link
After calling function, it throws an error shown below. How can I fix it?
Here is the error
...ANSWER
Answered 2021-Jan-03 at 16:00The issue is that you are using euclidean distance for comparing strings. Consider using Levenshtein distance, or something similar, which is designed for strings. NLTK has a function called edit distance that can do this or you can implement it on your own.
QUESTION
On my website I have two expandable menus, one of which is a navbar, another a playlist. I'd like to make it so all of the items on the website move down when the navbar is expanded (which I did), but also make it so no items react when the playlist is opened. In my case, a cat photo and the pageselector are forced to move down when the "Zelda Playlist" is expanded. How can I fix this so that they ignore it?
Note: The page is really scuffed because all of my other elements are missing but you can still see the problem if you expand the snippet.
...ANSWER
Answered 2020-Aug-27 at 04:08To prevent things from being bumped down you will need to pull the dropdown playlist out of the document flow, with position:absolute
QUESTION
When I expand a collapsed menu the items below it don't move and the expanded menu overlaps the items. How do I get rid of this feature? What I want to happen is the item below (in this case "Zelda Playlist") to go down with the expanded collapse and return back to its original place when the menu is collapsed. Would it be through CSS or JavaScript? Also I recommend expanding the snippet so you can understand what I mean better.
...ANSWER
Answered 2020-Aug-25 at 03:04You could use position: relative instead of absolute on the .collapsibleWrapper element. Reposition as necessary
QUESTION
I'm making a kind of nested collapse feature in html but was wondering how I can move the first card within the "Zelda Playlist" right below the button. Nothing seems to work and it just seems super buggy. I've changed positions and tried the left, top, bottom, and right features, but it remains bugged out in the corner. Also if there is a way to move both elements together that would be even better.
...ANSWER
Answered 2020-Aug-24 at 23:16The code would be more manageable using stylesheet. as shown.
To move the "Zelda Playlist" right below the button, all you need is a wrapper that encapsulates the button and the playlist.
After that, migrate the positioning css from the button to the wrapper (position of any element is block by default, which means if the button is above the playlist within the wrapper, the button and playlist is vertically-aligned by default).
Set to right:5% instead of left: 95%, this allows the wrapper items to align right by default.
Set the button to float right and margin-left:100% to ensure that it's on the right side.
Set collapse div to 100% to ensure that the whole collapsed div is not shrunk
QUESTION
I've implemented callback_list_stream generically, but I can't seem to use it in a specialized way. The code works if I copy/paste the code per T.
ANSWER
Answered 2020-Aug-21 at 14:50I believe that need to add a constrain on the lifetime of the inner SourceInfo data to the original reference:
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