synchronized { }

[BCS]

Reply to cemiller,

> I use it on occasion. It can be useful for singleton:
> 
> if(!foo)
> {
> synchronized
> {
> if(!foo)
> foo = new Foo();
> }
> }
> return foo;
> especially useful because you don't need an object instance.
> 

Hmmm. Slight variation on my last suggestion, Allow synchronized to take 
any global symbol as the mutex

if(!foo)
{
  synchronized(Foo)  // global mutex on Foo
  {
    if(!foo)
      foo = new Foo();
  }
}

Or if you need more resolution:

class Foo
{
  alias void single;
}

...
  synchronized(Foo.single)  // global mutex on Foo.single
...