intrusive_ptr<C> spawn_impl(BeforeLaunch before_launch_fun, Ts&&... args) {
static_assert(!std::is_base_of<blocking_actor, C>::value ||
has_blocking_api_flag(Os),
"C is derived type of blocking_actor but "
"blocking_api_flag is missing");
static_assert(is_unbound(Os),
"top-level spawns cannot have monitor or link flag");
CPPA_LOGF_TRACE("spawn " << detail::demangle<C>());
// runtime check wheter context_switching_resume can be used,
// i.e., add the detached flag if libcppa was compiled
// without cs_thread support when using the blocking API
if (has_blocking_api_flag(Os)
&& !has_detach_flag(Os)
&& detail::cs_thread::is_disabled_feature) {
return spawn_impl<C, Os + detached>(before_launch_fun,
std::forward<Ts>(args)...);
}
/*
using scheduling_policy = typename std::conditional<
has_detach_flag(Os),
policy::no_scheduling,
policy::cooperative_scheduling
>::type;
*/
using scheduling_policy = policy::no_scheduling;
using priority_policy = typename std::conditional<
has_priority_aware_flag(Os),
policy::prioritizing,
policy::not_prioritizing
>::type;
using resume_policy = typename std::conditional<
has_blocking_api_flag(Os),
typename std::conditional<
has_detach_flag(Os),
policy::no_resume,
policy::context_switching_resume
>::type,
policy::event_based_resume
>::type;
using invoke_policy = typename std::conditional<
has_blocking_api_flag(Os),
policy::nestable_invoke,
policy::sequential_invoke
>::type;
using policies = policy::policies<scheduling_policy,
priority_policy,
resume_policy,
invoke_policy>;
using proper_impl = detail::proper_actor<C, policies>;
auto ptr = make_counted<proper_impl>(std::forward<Ts>(args)...);
CPPA_PUSH_AID(ptr->id());
before_launch_fun(ptr.get());
ptr->launch(has_hide_flag(Os));
return ptr;
}
void publish_impl(abstract_actor_ptr ptr, std::unique_ptr<acceptor> aptr) {
// begin the scenes, we serialze/deserialize as actor
actor whom{raw_access::unsafe_cast(ptr.get())};
CPPA_LOGF_TRACE(CPPA_TARG(whom, to_string) << ", " << CPPA_MARG(aptr, get));
if (!whom) return;
get_actor_registry()->put(whom->id(), detail::raw_access::get(whom));
auto mm = get_middleman();
auto addr = whom.address();
auto sigs = whom->interface();
mm->register_acceptor(addr, new peer_acceptor(mm, move(aptr),
addr, move(sigs)));
}
void context_switching_resume::trampoline(void* this_ptr) {
CPPA_LOGF_TRACE(CPPA_ARG(this_ptr));
auto self = reinterpret_cast<blocking_actor*>(this_ptr);
auto shut_actor_down = [self](std::uint32_t reason) {
if (self->planned_exit_reason() == exit_reason::not_exited) {
self->planned_exit_reason(reason);
}
self->on_exit();
self->cleanup(self->planned_exit_reason());
};
try {
self->act();
shut_actor_down(exit_reason::normal);
}
catch (actor_exited& e) {
shut_actor_down(e.reason());
}
catch (...) {
shut_actor_down(exit_reason::unhandled_exception);
}
std::atomic_thread_fence(std::memory_order_seq_cst);
CPPA_LOGF_DEBUG("done, yield() back to execution unit");;
detail::yield(detail::yield_state::done);
}
abstract_actor_ptr remote_actor_impl(stream_ptr_pair io, string_set expected) {
CPPA_LOGF_TRACE("io{" << io.first.get() << ", " << io.second.get() << "}");
auto mm = get_middleman();
auto pinf = mm->node();
std::uint32_t process_id = pinf->process_id();
// throws on error
io.second->write(&process_id, sizeof(std::uint32_t));
io.second->write(pinf->host_id().data(), pinf->host_id().size());
// deserialize: actor id, process id, node id, interface
actor_id remote_aid;
std::uint32_t peer_pid;
node_id::host_id_type peer_node_id;
std::uint32_t iface_size;
std::set<std::string> iface;
auto& in = io.first;
// -> actor id
in->read(&remote_aid, sizeof(actor_id));
// -> process id
in->read(&peer_pid, sizeof(std::uint32_t));
// -> node id
in->read(peer_node_id.data(), peer_node_id.size());
// -> interface
in->read(&iface_size, sizeof(std::uint32_t));
if (iface_size > max_iface_size) {
throw std::invalid_argument("Remote actor claims to have more than"
+std::to_string(max_iface_size)+
" message types? Someone is trying"
" something nasty!");
}
std::vector<char> strbuf;
for (std::uint32_t i = 0; i < iface_size; ++i) {
std::uint32_t str_size;
in->read(&str_size, sizeof(std::uint32_t));
if (str_size > max_iface_clause_size) {
throw std::invalid_argument("Remote actor claims to have a"
" reply_to<...>::with<...> clause with"
" more than"
+std::to_string(max_iface_clause_size)+
" characters? Someone is"
" trying something nasty!");
}
strbuf.reserve(str_size + 1);
strbuf.resize(str_size);
in->read(strbuf.data(), str_size);
strbuf.push_back('\0');
iface.insert(std::string{strbuf.data()});
}
// deserialization done, check interface
if (iface != expected) {
auto tostr = [](const std::set<std::string>& what) -> std::string {
if (what.empty()) return "actor";
std::string tmp;
tmp = "typed_actor<";
auto i = what.begin();
auto e = what.end();
tmp += *i++;
while (i != e) tmp += *i++;
tmp += ">";
return tmp;
};
auto iface_str = tostr(iface);
auto expected_str = tostr(expected);
if (expected.empty()) {
throw std::invalid_argument("expected remote actor to be a "
"dynamically typed actor but found "
"a strongly typed actor of type "
+ iface_str);
}
if (iface.empty()) {
throw std::invalid_argument("expected remote actor to be a "
"strongly typed actor of type "
+ expected_str +
" but found a dynamically typed actor");
}
throw std::invalid_argument("expected remote actor to be a "
"strongly typed actor of type "
+ expected_str +
" but found a strongly typed actor of type "
+ iface_str);
}
auto pinfptr = make_counted<node_id>(peer_pid, peer_node_id);
if (*pinf == *pinfptr) {
// this is a local actor, not a remote actor
CPPA_LOGF_INFO("remote_actor() called to access a local actor");
auto ptr = get_actor_registry()->get(remote_aid);
return ptr;
}
struct remote_actor_result { remote_actor_result* next; actor value; };
std::mutex qmtx;
std::condition_variable qcv;
intrusive::single_reader_queue<remote_actor_result> q;
mm->run_later([mm, io, pinfptr, remote_aid, &q, &qmtx, &qcv] {
CPPA_LOGC_TRACE("cppa",
"remote_actor$create_connection", "");
auto pp = mm->get_peer(*pinfptr);
CPPA_LOGF_INFO_IF(pp, "connection already exists (re-use old one)");
if (!pp) mm->new_peer(io.first, io.second, pinfptr);
auto res = mm->get_namespace().get_or_put(pinfptr, remote_aid);
q.synchronized_enqueue(qmtx, qcv, new remote_actor_result{0, res});
});
std::unique_ptr<remote_actor_result> result(q.synchronized_pop(qmtx, qcv));
CPPA_LOGF_DEBUG(CPPA_MARG(result, get));
return raw_access::get(result->value);
}
