void middleman_event_handler::update() {
BOOST_ACTOR_LOG_TRACE("");
auto mless = [](const fd_meta_info& lhs, native_socket_type rhs) {
return lhs.fd < rhs;
};
for (auto& elem_pair : m_alterations) {
auto& elem = elem_pair.first;
auto old = event::none;
auto last = m_meta.end();
auto iter = std::lower_bound(m_meta.begin(), last, elem.fd, mless);
if (iter != last) old = iter->mask;
auto mask = next_bitmask(old, elem.mask, elem_pair.second);
auto ptr = elem.ptr;
BOOST_ACTOR_LOG_DEBUG("new bitmask for "
<< elem.ptr << ": " << eb2str(mask));
if (iter == last || iter->fd != elem.fd) {
if (mask != event::none) {
// element has been removed from m_meta by an
// previous alteration but is not put back in
m_meta.insert(iter, elem);
handle_event(fd_meta_event::add, elem.fd,
event::none, mask, ptr);
}
}
else if (iter->fd == elem.fd) {
BOOST_ACTOR_REQUIRE(iter->ptr == elem.ptr);
if (mask == event::none) {
// note: we cannot decide whether it's safe to dispose `ptr`,
// because we didn't parse all alterations yet
m_dispose_list.emplace_back(ptr);
m_meta.erase(iter);
handle_event(fd_meta_event::erase, elem.fd, old, mask, ptr);
}
else {
iter->mask = mask;
handle_event(fd_meta_event::mod, elem.fd, old, mask, ptr);
}
}
}
m_alterations.clear();
// m_meta won't be touched inside loop
auto first = m_meta.begin();
auto last = m_meta.end();
// checks whether an element can be safely deleted,
// i.e., was not put back into m_meta by some alteration
auto is_alive = [&](native_socket_type fd) -> bool {
auto iter = std::lower_bound(first, last, fd, mless);
return iter != last && iter->fd == fd;
};
// dispose everything that wasn't put back into m_meta again
for (auto elem : m_dispose_list) {
auto rd = elem->read_handle();
auto wr = elem->write_handle();
if ( (rd == wr && !is_alive(rd))
|| (rd != wr && !is_alive(rd) && !is_alive(wr))) {
elem->dispose();
}
}
m_dispose_list.clear();
}
void update() {
CPPA_LOG_TRACE("");
for (auto& elem_pair : m_alterations) {
auto& elem = elem_pair.first;
auto old = event::none;
auto last = end(m_meta);
auto iter = lower_bound(begin(m_meta), last, elem.fd, m_less);
if (iter != last) old = iter->mask;
auto mask = next_bitmask(old, elem.mask, elem_pair.second);
auto ptr = elem.ptr.get();
CPPA_LOG_DEBUG("new bitmask for "
<< elem.ptr.get() << ": " << eb2str(mask));
if (iter == last || iter->fd != elem.fd) {
CPPA_LOG_INFO_IF(mask == event::none,
"cannot erase " << ptr
<< " (not found in m_meta)");
if (mask != event::none) {
m_meta.insert(iter, elem);
d()->handle_event(fd_meta_event::add, elem.fd,
event::none, mask, ptr);
}
}
else if (iter->fd == elem.fd) {
CPPA_REQUIRE(iter->ptr == elem.ptr);
if (mask == event::none) {
m_meta.erase(iter);
d()->handle_event(fd_meta_event::erase, elem.fd, old, mask, ptr);
}
else {
iter->mask = mask;
d()->handle_event(fd_meta_event::mod, elem.fd, old, mask, ptr);
}
}
}
m_alterations.clear();
}