threadloop | Tornado IOLoop Backed Concurrent Futures | Web Framework library

This can be a device specific issue. Vivo devices has number of issues with multiple applications. Try this with another device It will work fine.

As you see exception, you get idea that you application is consuming plenty of RAM of device.

You need to manage that memory leak in your flutter application.

Android and iOS OS allocate every application limited amount of RAM in order to manage all process at same time.

If any of application uses more RAM then their allocation, OS stops all process of that application. and we see it as crash.

In your case, you are plying multiple videos in your application, and all videos are caught videos. As they are caught videos, they are temporarily saved in RAM, and as you see more and more video, you are using more and more RAM.

You need to optimise your application, you can clear video after page changes.

With that you can control your memory leak.

So I've done a little more digging on the community supported WebView github page and turns out there is this androidHardwareAccelerationDisabled which is a boolean. I tried setting it to true and it seems to have fixed the problem!

Edit - answer to comments

Even if there is a try - catch clause the exception may be thrown either way - when your code implicitly or you explicitly throw an exception inside of a catch block it won't be handled by custom UncaughtExceptionHandler

All the exception that are not handled(have no try - catch wrapper) and have no custom UncaughtExceptionHandler will be handled by the default one.

In terms of Android, exceptions in C code is quite hard to handle and catch whatsoever - the best way for that is to propagate them to your android code and handle them there - but it only applies to your C code but not some third party libraries. If there is no such propagation and exception is terminal - the app will stop rapidly and unexpectedly without any proper error management even with default UncaughtExceptionHandler

The error you've just updated you question with is a bit different from both Java and C ones. As you can see it has occurred on RenderThread thus it is directly connected with the CPU and GPU execution of the code. In android there are several ways to work in such conditions: OpenGl, Vulkan, RenderScript, OpenCl etc.

Flutter framework use GPU rendering paradigm so it basically works as games work on smartphones. I can assume that it uses some of described technologies to render UI(I think it is OpenGL since it is supported by most devices out of the box, though it may be some combination).

The error you posted is basically a C error but it is an error in RenderThread thus it is caused by incorrect execution of command either by GPU or CPU.

Flutter can handle some of such errors in correct way and give you a human readable resolution. Not in this case though.

I am sorry mate, there is no way to catch this error. But it is not intended to be caught as well as NullPoitnerException - those exceptions indicate some problems that should be fixed by the developer but not hidden with simple relaunch of the app.

Edit end

The thing is - there is no such thing as "absolutely catch all crashes" in Java. And this is the intended behaviour of JVM.

While setDefaultUncaughtExceptionHandler should work in most cases, it will not work when:

• Another setDefaultUncaughtExceptionHandler is used somewhere outside of your code(or thread an uncaught exception has occurred on has its own handler)

• The exception you want to catch by it is handled - wrapped by try - catch clause

• You want to show something(dialog or toast) inside the custom UncaughtExceptionHandler - that is highly not recommended since if the exception occurred on UI thread the app might freeze and if the exception occurred on non UI thread - when trying to show dialog you will receive an uncaught exception instead, since you can show something only on UI thread.

There are more cases but those cannot be applied to Android since those are web specific cases.

Also flutter has it own exception handling mechanism - so the flutter framework exceptions may not be handled the way you expect with custom UncaughtExceptionHandler.

So basically there is no way to clearly catch all the exceptions in Android app. Even Crashlitycs fails to catch them all, and it uses native(C based) approach.

Hope it helps.

Finally figured it out, after 5 painful days!

The problem is Audio Sampling Rate and Encoding Bit Rate.

When initializing MediaRecorder object (before start)

Emulator

When the monitored key is deleted, you have to close your handle to the key and reopen it before you can monitor it again.

In other words, once RegNotifyChangeKeyValue(registryKey, ...) fails because registryKey is no longer valid, you need to call RegCloseKey(registryKey); and then call either RegOpenKeyEx(..., out registryKey) or RegCreateKeyEx(..., out registryKey) to reopen registryKey before you can then call RegNotifyChangeKeyValue(registryKey, ...) again. For example:

I have gif to animate so I have added gif in assets folder and then I am calling the below method which is using coroutine to show the image

You do not need any barriers because it is guaranteed that the thread constructor synchronizes with the invocation of the function passed to it. In Standardese:

The completion of the invocation of the constructor synchronizes with the beginning of the invocation of the copy of f.

Somewhat formal proof: run_worker_thread_ = true;(A) is sequenced before the thread object creation (B) according to the full expressions evaluation order. The thread object construction synchronizes with the closure object execution (C) according to the rule cited above. Hence, A inter-thread happens before C.

A seq before B, B sync with C, A happens before C -> this is a formal proof in Standard terms.

And when analyzing programs in C++11+ era you should stick to the C++ model of memory & execution and forget about barriers and reordering which compiler might or might not do. These are just implementation details. The only thing that matters is the formal proof in the C++ terms. Compiler must obey and do (and not do) whatever it can to adhere to the rules.

But for the sake of completeness let's look at the code with compiler's eyes and try to understand why it can't reorder anything in this case. We all know the "as-if" rule under which the compiler might reorder some instructions if you can't tell they have been reordered. So if we have some bool flags setting:

I have a program which nearly immediately finishes with -O0 on gcc, but hangs forever with gcc and -O3

Yes, because the program gets compiled down to an infinite loop when optimizations are enabled.

Is this a compiler bug? A lack of documentation for the proper caveats to using [[gnu::pure]]? A misreading of the documentation for [[gnu::pure]] such that I've coded a bug?

It isn't a compiler bug. get_value_plus is not a pure function: