/*
* rump_schedule: ensure that the calling host thread has a valid lwp context.
* ie. ensure that curlwp != NULL. Also, ensure that there
* a 1:1 mapping between the lwp and rump kernel cpu.
*/
void
rump_schedule()
{
struct lwp *l;
/*
* If there is no dedicated lwp, allocate a temp one and
* set it to be free'd upon unschedule(). Use lwp0 context
* for reserving the necessary resources. Don't optimize
* for this case -- anyone who cares about performance will
* start a real thread.
*/
if (__predict_true((l = curlwp) != NULL)) {
rump_schedule_cpu(l);
LWP_CACHE_CREDS(l, l->l_proc);
} else {
lwp0busy();
/* schedule cpu and use lwp0 */
rump_schedule_cpu(&lwp0);
rump_lwproc_curlwp_set(&lwp0);
/* allocate thread, switch to it, and release lwp0 */
l = rump__lwproc_alloclwp(initproc);
rump_lwproc_switch(l);
lwp0rele();
/*
* mark new thread dead-on-unschedule. this
* means that we'll be running with l_refcnt == 0.
* relax, it's fine.
*/
rump_lwproc_releaselwp();
}
}
void
rump_pub_lwproc_releaselwp(void)
{
rump_schedule();
rump_lwproc_releaselwp();
rump_unschedule();
}
