RFR: 8263788: JavaFX application freezes completely after some time when using the WebView

[Kevin Rushforth]

On Mon, 12 Apr 2021 13:10:53 GMT, Arun Joseph <ajoseph at openjdk.org> wrote:

> Issue: Java application (with WebView) will completely freeze after using it for a while.
> 
> Fix: Use native isMainThread functions instead of JNI call.

The code changes look good. I still need to test it. Speaking of which, I presume you've tested this on all three platforms?

I left one question inline.

@johanvos, @arapte, or @guruhb can one of you be the second reviewer?

modules/javafx.web/src/main/native/Source/WTF/wtf/java/MainThreadJava.cpp line 45:

> 43: #elif OS(WINDOWS)
> 44: static ThreadIdentifier mainThread { 0 };
> 45: #endif

Both here and below, where the `isMainThread` is defined, assume that `UNIX` and `WINDOWS` are the only two options. I presume this is a valid assumption?

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PR: https://git.openjdk.java.net/jfx/pull/461