delegate to execute in the created thread.
size of the stack of the created thread. The default of 0 will select the platform-specific default size.
Windows only: if running in a dynamically loaded DLL, this delegate will be called if the DLL is supposed to be unloaded, but the thread is still running. The thread must be terminated via joinLowLevelThread by the callback.
the platform specific thread ID of the new thread. If an error occurs, ThreadID.init is returned.
Create a thread not under control of the runtime, i.e. TLS module constructors are not run and the GC does not suspend it during a collection.