Architecture : 64-bit Intel. Base SDK : Mac OS X 10.6 NPN_PluginThreadAsyncCall() crashes Safari when called from a child thread which is started by the plugin thread in Safari 4 on Snow Leopard. Child thread is started by using pthread library. When PluginThreadAsyncCall() is called from plugin thread, it is working fine. The same piece of code is running well in Safari 4 on Tiger and Leopard.
NPAPI plugins were removed a while ago.