This version, egcs, is a new development effort aimed at integrating all the optimizations and features necessary for a high-performance and stable development environment. Notes Date Note g77 G77 is the GNU Fortran 77 compiler. This is better than the older version, usually called libc5 or just plain libc , but the two do not have binary compatibility. Besides the current glibc 2.1.x libraries, several older versions are also installed in order to run older applications, if needed. Green threads implement user level threads, and use only a single OS thread.
Native threads use the OS's threading system, and use one OS thread per java thread.
If you have problems, try using native threads.