On Tue, 2 Feb 2021 21:18:42 GMT, Kevin Rushforth <k...@openjdk.org> wrote:
>> We are just specifying an additional run mode for JDK internal use.
>> It means that when we are saying to process only events for that mode, then
>> only those will be processed.
>> And it is used only for nested event loops.
>> Nothing eternal should be assuming AWT uses JNF at all, never mind in a
>> particular way.
>>
>> There is a special case for FX but I don't see a problem.
>>
>> If you look at Java_sun_lwawt_macosx_LWCToolkit_doAWTRunLoopImpl
>> there's a variable "inAWT".
>> isRunning = [[NSRunLoop currentRunLoop] runMode:(inAWT ?
>> [JNFRunLoop javaRunLoopMode] : NSDefaultRunLoopMode) ... ]];
>>
>> This is specified as
>> inAWT = AccessController.doPrivileged(new
>> PrivilegedAction<Boolean>() {
>> @Override
>> public Boolean run() {
>> return
>> !Boolean.parseBoolean(System.getProperty("javafx.embed.singleThread",
>> "false"));
>> }
>> });
>> }
>>
>> So generally FX doesn't care, and is ignorant of this new mode.
>> Unless you set that property to true, in which case AWT use the
>> NSDefaultRunLoopMode and so again FX is unaffected.
>> Nothing in the FX sources goes anywhere near JNF .. or has a reference to
>> the special mode.
>>
>> Bottom line I don't see it being affected.
>>
>> I'll check with Kevin but also Gerard had a lot to do with the creation of
>> the current FX toolkit.
>
> I ran some tests embedding JavaFX into Swing and vice versa both with and
> without `-Djavafx.embed.singleThread=true` and I don't see any regression in
> behavior.
I am mostly worried about the usage of JNF by someone else's native code, as
far as I understand it could be "broken" now. But it is good that FX does not
use it.
BTW looks like all comments like "// AWT_THREADING Safe (AWTRunLoop)" could be
removed now.
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PR: https://git.openjdk.java.net/jdk/pull/2305
