On Thu, May 18, 2017 at 5:05 PM, Graeme Geldenhuys
<mailingli...@geldenhuys.co.uk> wrote:
> Use Java instead. ;-) Check. Oh wait, that's what I did for that project.
Well, Java also has its issues. I am studying Java and I am completely
shocked that you need to use "volatile" to avoid serious hard-to-debug
multithreading bugs.
It looks like you pretty much need to declare all vars that might be
accessed from different threads as volatile from what I understood,
because otherwise the java compiler might never write values to the
variable at all, instead write only to a local cache. Amazing!
In FPC this isn't needed since assignments always change real memory.
Thinking about it, maybe FPC needs the oposite kind of variable
modified, a "notvolatile" so that it could optimize more agressively
in case you are 100% sure this code will be run on a single thread...
This simple program never ends if you delete the volatile keyword (I
tested here in Windows):
import java.util.*;
class FelipeTestThread
{
volatile boolean running = true;
public void test()
{
new Thread(new Runnable()
{
public void run()
{
int counter = 0;
while (running) {
counter++;
}
System.out.println("Thread 1 finished. Counted up to "
+ counter);
}
}).start();
new Thread(new Runnable()
{
public void run()
{
// Sleep for a bit so that thread 1 has a chance to start
try
{
Thread.sleep(100);
} catch (InterruptedException ignored) { }
System.out.println("Thread 2 finishing");
running = false;
}
}).start();
}
public static void main(String[] args)
{
new FelipeTestThread().test();
}
}
Not to mention that 1 file per class is super annoying and it is
impossible to resize arrays and there are no unsigned integers.
Generics can't accept non-Object values. There is no way to pass
parameters by reference, accessing operating system APIs is a
nightmare which involves writing large JNI wrappers in C...etc.
--
Felipe Monteiro de Carvalho
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