Deprecate synchronized classes please!

[Loara]

On Tuesday, 6 September 2022 at 10:52:13 UTC, IGotD- wrote:
> I'm not sure you mean with "send".

https://dlang.org/phobos/std_concurrency.html#.send

This is the standard method in D to send data to other threads. 
Documentation says that you can't send unshared indirections, 
even if they're synchronized classes.

>> Also in a `synchronized` class each member becomes `shared`, 
>> but this will force you to use atomic operation even if you 
>> have exclusive access to data variables. All the stuff around 
>> `synchronized` seems poorly designed only as a copy of Java's 
>> synchronization and later abandoned.
>
> If all members becomes atomic inside a synchronized class, then 
> it's a design error. The whole point of a synchronized class is 
> that the members should be normal variables and not atomics.

This is the reason behind error message I've posted. Currently 
synchronized classes exists only as a mirror of Java's 
synchronization mechanism, but without a well integration with D 
ecosystem. Maybe we should rethink entirely `synchronized` inside 
D.