int
rw_tryenter(krwlock_t *rw, const krw_t op)
{
int error;
error = rumpuser_rw_tryenter(krw2rumprw(op), RUMPRW(rw));
if (error == 0) {
WANTLOCK(rw, op == RW_READER);
LOCKED(rw, op == RW_READER);
}
return error == 0;
}
void
rumpuser_rw_enter(int enum_rumprwlock, struct rumpuser_rw *rw)
{
enum rumprwlock lk = enum_rumprwlock;
struct waithead *w = NULL;
int nlocks;
switch (lk) {
case RUMPUSER_RW_WRITER:
w = &rw->wwait;
break;
case RUMPUSER_RW_READER:
w = &rw->rwait;
break;
}
if (rumpuser_rw_tryenter(enum_rumprwlock, rw) != 0) {
rumpkern_unsched(&nlocks, NULL);
while (rumpuser_rw_tryenter(enum_rumprwlock, rw) != 0)
wait(w, BMK_SCHED_BLOCK_INFTIME);
rumpkern_sched(nlocks, NULL);
}
}
int
rw_tryenter(krwlock_t *rw, const krw_t op)
{
return rumpuser_rw_tryenter(rw->krw_pthlock, op == RW_WRITER);
}