PDU& PacketSenderGeneric::send_recv(PDU& spdu, SharedSender& shared_sender, const NetworkInterface& iface, bool promisc, double* rdelay, double* edelay)
{
//wait for previous packet to receive response (TODO: not ideal, plan future change)
while (sent_pdu) {
std::this_thread::sleep_for(std::chrono::milliseconds(1000));
}
sent_pdu = spdu.clone();
//start sniff task
SnifferConfiguration config;
config.set_promisc_mode(promisc);
config.set_snap_len(65535);
config.set_timeout(10);
//Critical section
SHARED_SNIFFER_MUTEX.lock();
Sniffer sniffer{ iface.name(), config };
SHARED_SNIFFER_MUTEX.unlock();
bool compute_delay = true;
if (!rdelay)
compute_delay = false;
std::future<void> fresp(std::async(std::launch::async, &PacketSenderGeneric::sniff_task, this, &sniffer, compute_delay));
//send packet
std::clock_t effective_sent_time = std::clock();
std::cout << "Registering packet to send !" << std::endl;
shared_sender.register_packet(sent_pdu, NetworkInterface(iface));
//std::cout << "waiting for max " << timeout << "..." << std::endl;
std::future_status status = fresp.wait_for(std::chrono::seconds(timeout));
//raise exception in case of timeout
if (status == std::future_status::timeout)
{
sniffer.stop_sniff();
sent_pdu = NULL;
throw timeout_elapsed();
}
else if (status == std::future_status::deferred)
std::cout << "DEBUG: packet sniffing deffered... shouldn't happen";
//Treat response packet
if (edelay)
*edelay = ((std::clock() - effective_sent_time) / (double)CLOCKS_PER_SEC) * 1000;
if (rdelay) {
*rdelay = response_delay;
}
PDU& response(*this->response_pdu);
//Clean
sent_pdu = NULL;
response_delay = NULL;
//response_pdu = NULL;
return response;
}
inline std::string SpellCorrect::get_one_known_edit_of_d2(const std::string & word) const
{
search_start_ = std::clock();
const auto word_edits = get_word_edits_of_d1(word);
for(const auto & edit : word_edits)
{
const auto known_edits = known_words(get_word_edits_of_d1(edit));
if(!known_edits.empty()) return *known_edits.begin();
if(timeout_elapsed()) return std::string();
}
return std::string();
}
static void
iris_thread_worker_exclusive (IrisThread *thread,
IrisQueue *queue,
gboolean leader)
{
GTimeVal tv_now = {0,0};
GTimeVal tv_req = {0,0};
IrisThreadWork *thread_work = NULL;
gint per_quanta = 0; /* Completed items within the
* last quanta. */
guint queued = 0; /* Items left in the queue at */
gboolean has_resized = FALSE;
iris_debug (IRIS_DEBUG_THREAD);
g_get_current_time (&tv_now);
g_get_current_time (&tv_req);
queued = iris_queue_length (queue);
/* Since our thread is in exclusive mode, we are responsible for
* asking the scheduler manager to add or remove threads based
* on the demand of our work queue.
*
* If the scheduler has maxed out the number of threads it is
* allowed, then we will not ask the scheduler to add more
* threads and rebalance.
*/
get_next_item:
if (G_LIKELY ((thread_work = iris_queue_pop (queue)) != NULL)) {
if (!VERIFY_THREAD_WORK (thread_work))
goto get_next_item;
iris_thread_work_run (thread_work);
iris_thread_work_free (thread_work);
per_quanta++;
}
else {
#if 0
g_warning ("Exclusive thread is done managing, received NULL");
#endif
return;
}
if (G_UNLIKELY (!thread->scheduler->maxed && leader)) {
g_get_current_time (&tv_now);
if (G_UNLIKELY (timeout_elapsed (&tv_now, &tv_req))) {
/* We check to see if we have a bunch more work to do
* or a potential edge case where we are processing about
* the same speed as the pusher, but it creates enough
* contention where we dont speed up. This is because
* some schedulers will round-robin or steal. And unless
* we look to add another thread even though we have nothing
* in the queue, we know there are more coming.
*/
queued = iris_queue_length (queue);
if (queued == 0 && !has_resized) {
queued = per_quanta * 2;
has_resized = TRUE;
}
if (per_quanta < queued) {
/* make sure we are not maxed before asking */
if (!g_atomic_int_get (&thread->scheduler->maxed))
iris_scheduler_manager_request (thread->scheduler,
per_quanta,
queued);
}
per_quanta = 0;
tv_req = tv_now;
g_time_val_add (&tv_req, QUANTUM_USECS);
}
}
goto get_next_item;
}
static void
iris_thread_worker_exclusive (IrisThread *thread,
IrisQueue *queue,
gboolean leader)
{
GTimeVal tv_now = {0,0};
GTimeVal tv_req = {0,0};
IrisThreadWork *thread_work = NULL;
gint per_quanta = 0; /* Completed items within the
* last quanta. */
guint queued = 0; /* Items left in the queue at */
gboolean has_resized = FALSE;
gboolean remove_work;
iris_debug (IRIS_DEBUG_THREAD);
g_get_current_time (&tv_now);
g_get_current_time (&tv_req);
queued = iris_queue_get_length (queue);
/* Since our thread is in exclusive mode, we are responsible for
* asking the scheduler manager to add or remove threads based
* on the demand of our work queue.
*
* If the scheduler has maxed out the number of threads it is
* allowed, then we will not ask the scheduler to add more
* threads and rebalance.
*/
get_next_item:
if (G_LIKELY ((thread_work = iris_queue_pop (queue)) != NULL)) {
if (!g_atomic_int_compare_and_exchange(&thread_work->taken, FALSE, TRUE)) {
remove_work = g_atomic_int_get (&thread_work->remove);
if (!remove_work)
/* We lost a race with another thread (remember a lockfree
* queue may pop the same item twice).
*/
goto get_next_item;
/* else: We lost a race with iris_scheduler_unqueue() */
} else
/* We won the race. 'remove' is honoured anyway if we can. */
remove_work = g_atomic_int_get (&thread_work->remove);
if (!remove_work) {
iris_thread_work_run (thread_work);
per_quanta++;
}
iris_thread_work_free (thread_work);
}
else {
/* Queue is closed, so scheduler is finalizing. The scheduler will be
* waiting until we set thread->scheduler to NULL.
*/
g_atomic_pointer_set (&thread->scheduler, NULL);
iris_scheduler_manager_yield (thread);
return;
}
if (remove_work)
goto get_next_item;
if (G_UNLIKELY (!thread->scheduler->maxed && leader)) {
g_get_current_time (&tv_now);
if (G_UNLIKELY (timeout_elapsed (&tv_now, &tv_req))) {
/* We check to see if we have a bunch more work to do
* or a potential edge case where we are processing about
* the same speed as the pusher, but it creates enough
* contention where we dont speed up. This is because
* some schedulers will round-robin or steal. And unless
* we look to add another thread even though we have nothing
* in the queue, we know there are more coming.
*/
queued = iris_queue_get_length (queue);
if (queued == 0 && !has_resized) {
queued = per_quanta * 2;
has_resized = TRUE;
}
if (per_quanta < queued) {
/* make sure we are not maxed before asking */
if (!g_atomic_int_get (&thread->scheduler->maxed))
iris_scheduler_manager_request (thread->scheduler,
per_quanta,
queued);
}
per_quanta = 0;
tv_req = tv_now;
g_time_val_add (&tv_req, QUANTUM_USECS);
}
}
goto get_next_item;
}
