PAGE_IO_INUSE
while (pp->p_iolock_state & PAGE_IO_INUSE) {
pp->p_iolock_state |= PAGE_IO_INUSE;
pp->p_iolock_state &= ~PAGE_IO_INUSE;
if (pp->p_iolock_state & PAGE_IO_INUSE)
if (pp->p_iolock_state & PAGE_IO_INUSE) {
pp->p_iolock_state |= PAGE_IO_INUSE;
while (pp->p_iolock_state & PAGE_IO_INUSE) {
return (pp->p_iolock_state & PAGE_IO_INUSE);