The following LWP interfaces might not be supported in a future release:
_lwp_create
_lwp_detach
_lwp_exit
_lwp_getprivate
_lwp_makecontext
_lwp_setprivate
_lwp_wait
These interfaces are not part of a common model with multithreading enabled by default. The interfaces have worked as expected only when used in applications that are not linked with libthread.
For more information, see the _lwp_create(2), _lwp_detach(2), _lwp_exit(2), _lwp_getprivate(2), _lwp_makecontext(2), _lwp_setprivate(2), and _lwp_wait(2) man pages.