Hi everybody, I am close to releasing JNIPort (http://jniport.wikispaces.com) for Pharo and Squeak. Almost everything works on both Mac OS X and Windows with one exception. I can attach a Java VM to Pharo/Squeak, I can send messages to Java objects and get results back, and even callbacks from Java to Smalltalk seem to work. The exception is that a callback from Java to Smalltalk which comes from a different thread leads to a crash of the Squeak VM. I have not been able to figure out what the problem is. There is a similar problem with a hook of the Java VM: one can register a callback function which is called whenever the Java VM produces output for stdout/stderr. With Pharo 1.1.1 on Mac OS X, using this hook works when the hook contains a "nil halt", and if I simply proceed in each of the notifiers. When I remove the halt or replace it by a Delay, the image freezes. In Squeak 4.1 on Windows, the behavior is different: the VM crashes. Does Alien support callbacks coming from a "foreign" thread? Or is this a limitation of Alien? Thanks in advance for any help, Joachim Geidel -- View this message in context: http://forum.world.st/Alien-and-callbacks-from-foreign-threads-tp3175989p31… Sent from the Pharo Smalltalk mailing list archive at Nabble.com.