_clone system call

I have been unable to find an implementation for the _clone function call (calls clone2 system call).

Does anyone know if it exists for ia64, I found an i386 implementation in the latest glibc? I see the
pthread library making a call to clone2 but it is not using the _clone interface.

Thank You
Patricia

The _clone function can't be usefully implemented on Itanium, since it doesn't provide for a place to put the register stack. If you really have to, use __clone2 instead. Its interface is identical to __clone except that an additional argument is added after the stack base; it's the stack size.

Under most circumstances, pthread_create is greatly preferred to either __clone or __clone2. The problem with calling __clone or __clone2 directly is that things are unlikely to work correctly if another library routine also want to create a thread or needs to provide for mutual exclusion.

Hans