platforms | A side-project on tilemap based games | Game Engine library
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A side-project on tilemap based games.
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QUESTION
In C++20, we got the capability to sleep on atomic variables, waiting for their value to change.
We do so by using the std::atomic::wait method.
Unfortunately, while wait has been standardized, wait_for and wait_until are not. Meaning that we cannot sleep on an atomic variable with a timeout.
Sleeping on an atomic variable is anyway implemented behind the scenes with WaitOnAddress on Windows and the futex system call on Linux.
Working around the above problem (no way to sleep on an atomic variable with a timeout), I could pass the memory address of an std::atomic to WaitOnAddress on Windows and it will (kinda) work with no UB, as the function gets void* as a parameter, and it's valid to cast std::atomic to void*
On Linux, it is unclear whether it's ok to mix std::atomic with futex. futex gets either a uint32_t* or a int32_t* (depending which manual you read), and casting std::atomic to u/int* is UB. On the other hand, the manual says
The uaddr argument points to the futex word. On all platforms, futexes are four-byte integers that must be aligned on a four- byte boundary. The operation to perform on the futex is specified in the futex_op argument; val is a value whose meaning and purpose depends on futex_op.
Hinting that alignas(4) std::atomic should work, and it doesn't matter which integer type is it is as long as the type has the size of 4 bytes and the alignment of 4.
Also, I have seen many places where this trick of combining atomics and futexes is implemented, including boost and TBB.
So what is the best way to sleep on an atomic variable with a timeout in a non UB way? Do we have to implement our own atomic class with OS primitives to achieve it correctly?
(Solutions like mixing atomics and condition variables exist, but sub-optimal)
...ANSWER
Answered 2021-Jun-15 at 20:48You shouldn't necessarily have to implement a full custom atomic API, it should actually be safe to simply pull out a pointer to the underlying data from the atomic and pass it to the system.
Since std::atomic does not offer some equivalent of native_handle like other synchronization primitives offer, you're going to be stuck doing some implementation-specific hacks to try to get it to interface with the native API.
For the most part, it's reasonably safe to assume that first member of these types in implementations will be the same as the T type -- at least for integral values [1]. This is an assurance that will make it possible to extract out this value.
... and casting
std::atomictou/int*is UB
This isn't actually the case.
std::atomic is guaranteed by the standard to be Standard-Layout Type. One helpful but often esoteric properties of standard layout types is that it is safe to reinterpret_cast a T to a value or reference of the first sub-object (e.g. the first member of the std::atomic).
As long as we can guarantee that the std::atomic contains only the u/int as a member (or at least, as its first member), then it's completely safe to extract out the type in this manner:
QUESTION
I am trying to contribute to a Github Page/Jekyll site and want to be able to visualise changes locally but when I run bundle exec jekyll serve but I get this output:
ANSWER
Answered 2021-Feb-02 at 16:29I had the same problem and I found a workaround here at https://github.com/jekyll/jekyll/issues/8523
Add gem "webrick" to the Gemfile in your website. Than run bundle install
At this point you can run bundle exec jekyll serve
For me it works!
QUESTION
I'm working on a multiplatform app (iOS and Android) that I'm using a .vue view to do the authentication on Firebase from both platforms using Gmail.
I'm using Google as a provider:
...ANSWER
Answered 2021-Jun-14 at 03:55I think this has been answered from this thread.
Just add a prompt for the user to select_account
QUESTION
I've Implemented the react player within a react js site it works fine I can embed video from Vimeo, youtube, and lots of other platforms. Now I need to hide or disable the context menu of youtube videos inside the react player. I made a change as below,
...ANSWER
Answered 2021-Jun-13 at 18:07I don't think you can do this.
- YouTube uses its own JavaScript to overwrite the right click menu.
- You will get SecurityError if you try to access the frame because the
_topplace is different fromyoutube.com. - Try using
contentWindowto disable the JavaScript context menu. In a perfect world, this should work.
QUESTION
I am aware that with Ionic you can create cross-platform applications. These can be created in Vue, React, Angular, etc. I do however wonder which dependencies are responsible for what.
In the background, as I can see in my package.json, the Ionic framework uses Capacitor. If you run the command ionic start myApp tabs with the Ionic CLI, then a new project is created and various dependencies are installed, including Capacitor.
However, I can just as easily add Capacitor to an existing Vue.js project and I also would be able to create a cross-platform application.
My guess is therefore that Ionic is simply an additional abstraction layer above Capacitor and has implemented some components that use Capacitor APIs and for example provides different styling on different platforms.
...ANSWER
Answered 2021-Jun-12 at 22:06Keep in mind that Ionic came before the Capacitor and understand that both are from the same creators.
Using Ionic you may build Android, iOS, PWA, Desktop using the same code. You may also choose your preferred framework to use with Ionic like Angular, VueJS, React and so on.
Capacitor is responsible for the bridge between your code and the device's functionalities.
Advantages: custom animations, components customization, web components, design to match native iOS13, iOS Segment design, collapsible header, large title in iOS, Searchbar inside of the collapsible header, swipe to close Modals, new iOS Menu design overlay with updated animation, refresher pulling icon in iOS, Material Design refresher as well, lists Header in iOS, open source animations utility, free and open source icon library, Back Button, Card, Segment, Split Pane, encapsulate styles, full support for Ivy Angular’s new renderer and so on... More on this Article.
Appflow is a service that is offered by Ionic Team.
QUESTION
Deploying my application to AWS with the 'bundle exec cap production deploy' command, I got following error:
...ANSWER
Answered 2021-Jun-13 at 12:45I had that problem before. So just removed using mini_racer, decided to install nodeJs in docker.
QUESTION
I'm trying to enable an executable (created by install4j) to work with a path given by an "open with" user interaction on a file.
On macOS (same should be true for other platforms AFAIK), when one right-clicks a file and chooses "open with -> Application", the application will be fired up and the path to the file will be given as an argument.
I read a lot of install4j tutorials, found a lot of command-line-related stuff, but didn't find how to get this running.
Currently, when I open a file with the created App, the path will be ignored. When I start my Java application via command line, it works fine.
Any ideas what to set up in install4j to make this work?
Thanks a lot.
Edit: After Ingo's suggestion I added this to my launcher class, but somehow it doesn't get called:
...ANSWER
Answered 2021-Jun-11 at 17:05On macOS (same should be true for other platforms AFAIK), when one right- clicks a file and chooses "open with -> Application", the application will be fired up and the path to the file will be given as an argument.
This is not the case for application bundles on macOS. You have to use the startup notification API. This also works for single instance mode on Windows and Linux, where only the first invocation will pass the file path as an argument to the main method.
The startup listener API uses java.awt.Desktop.setOpenFileHandler under the hood which only works if you register a file association. From the documentation on that method:
Please note that for Mac OS, notifications are only sent if the Java app is a bundled application, with a CFBundleDocumentTypes array present in its Info.plist.
For a method to add a file association for all file types, see this blog post:
https://www.cocoanetics.com/2013/01/open-in-all-files/
In the launcher wizard, under Executable info-> macOS options, you can add an arbitrary fragment to the Info.plist file.
QUESTION
I am using Xampp for my project where I have PHP files. I have another laravel project which I want to open when a user clicks on a button in PHP file. So, I want laravel project to work in Xampp so that I can complete the functionality of clicking button in "library.php" opening "showForm.blade.php" and on clicking button in "showForm.blade.php" sends request to "web.php"
"showForm.blade.php" is like this:
...ANSWER
Answered 2021-Jun-07 at 05:25Ok so after all the things I finally got it to working
No need to change the folder to laravel inside root project
No need to change the DocumentRoot
Just Had to change in blade.php from
QUESTION
ANSWER
Answered 2021-Jun-11 at 10:55I finally got the answer after some research. RequireJS Text plugin needs access some static files from wwwroot folder and for that we need Web.config file with static content as we want and rewrite rule. In my case Web.config file is given below and my site is running now perfectly.
QUESTION
FMOD for Unity 2.01.07 (Unity 2019.4.18f1 - running on MacOS Catalina) seems to have broken their FMODStudioSettings class.
I can't save in the editor without getting these errors:
...ANSWER
Answered 2021-Jun-10 at 21:36So this was a bug in the integration they fixed in 2.01.10.
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