[Opensim-dev] .NET / Mono lock(obj) statement

[Diva Canto]

Hi everyone,

Just got back from vacation to TP grief caused by extra locking 
introduced in 7982. The extra locking is all good, but it seems that 
certain things confuse the heck out of mono, so I thought I'd bring up 
the issue here -- I'm pretty sure this problem occurs in other places of 
the code too, so it's good to know what to expect. I'd certainly like to 
find out more about the .NET spec.

Here's a simplified version of the problem:

lock (a)
{
   foo();
}

void foo()
{
  lock (a)
  {
    ...
  }
}

(the real situation is a bit more complicated; foo() involves a 
delegate; but ignore that)

In Java, this situation does NOT result in locking, because it's the 
same thread that's acquiring object a. I can't find the spec for .NET 
for this particular issue, but I'd be very surprised if it is different 
from Java. Nevertheless, mono was deadlocking here; Windows was not. I 
find the mono behavior very strange.

Crista