How stable is LinuxThreads?
The basic functionality (thread creation and termination, mutexes, conditions, semaphores) is very stable. Several industrial-strength programs, such as the AOL multithreaded Web server, use LinuxThreads and seem quite happy about it. There used to be some rough edges in the LinuxThreads / C library interface with libc 5, but glibc 2 fixes all of those problems and is now the standard C library on major Linux distributions (see section C).