VSW_SWTHR_STOP
while ((vswp->sw_thr_flags & VSW_SWTHR_STOP) == 0) {
while ((vswp->sw_thr_flags & VSW_SWTHR_STOP) == 0) {
if ((vswp->sw_thr_flags & VSW_SWTHR_STOP) != 0) {
vswp->sw_thr_flags &= ~VSW_SWTHR_STOP;
vswp->sw_thr_flags |= VSW_SWTHR_STOP;