Multithreaded Programming Guide

System Scope (Bound Threads)

Bound threads are created PTHREAD_SCOPE_SYSTEM. A boundthread is permanently attached to an LWP.

Each bound thread is bound to an LWP for the lifetime of the thread. This is equivalent to creating a Solaris thread in the THR_BOUND state. You can bind a thread to give it an alternate signal stack or to use special scheduling attributes with Realtime scheduling. All scheduling is done by the operating environment.

Note -

In neither case, bound or unbound, can a thread be directly accessed by or moved to another process.