/*! Decrements lock counter and unlocks monitor if counter is 0;
* throws EBUSY if lock counter is not 0 */
void unlock()
{
gu::Lock lock(mutex_);
assert (locked_ >= 0);
if (0 == locked_)
{
assert (locked_ != 0);
gu_throw_error(EALREADY)
<< "Attempt to unlock an already unlocked monitor";
}
locked_--;
if (0 == locked_)
{
update_last_left();
drain_seqno_ = LLONG_MAX;
cond_.broadcast();
log_debug << "Unlocked local monitor at " << last_left_;
}
else
{
gu_throw_error(EBUSY);
}
}
void drain(wsrep_seqno_t seqno)
{
gu::Lock lock(mutex_);
while (drain_seqno_ != GU_LLONG_MAX)
{
lock.wait(cond_);
}
drain_common(seqno, lock);
// there can be some stale canceled entries
update_last_left();
drain_seqno_ = GU_LLONG_MAX;
cond_.broadcast();
}
void post_leave(const C& obj, gu::Lock& lock)
{
const wsrep_seqno_t obj_seqno(obj.seqno());
const size_t idx(indexof(obj_seqno));
if (last_left_ + 1 == obj_seqno) // we're shrinking window
{
process_[idx].state_ = Process::S_IDLE;
last_left_ = obj_seqno;
process_[idx].wait_cond_.broadcast();
update_last_left();
oool_ += (last_left_ > obj_seqno);
// wake up waiters that may remain above us (last_left_
// now is max)
wake_up_next();
}
else
{
process_[idx].state_ = Process::S_FINISHED;
}
process_[idx].obj_ = 0;
assert((last_left_ >= obj_seqno &&
process_[idx].state_ == Process::S_IDLE) ||
process_[idx].state_ == Process::S_FINISHED);
assert(last_left_ != last_entered_ ||
process_[indexof(last_left_)].state_ == Process::S_IDLE);
if ((last_left_ >= obj_seqno) || // - occupied window shrinked
(last_left_ >= drain_seqno_)) // - this is to notify drain that
// we reached drain_seqno_
{
cond_.broadcast();
}
}
