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Receiving UDP message while processing a deque


Receiving UDP message while processing a deque

By : Z.Mofei
Date : November 21 2020, 04:01 AM
this will help Nobody forces you to empty out the dequeue. You can check if an UDP message has arrived before dequeueing the next workload. And that is as far as you can get with threads, as they do not allow you to interrupt arbitrary code. They can always only be terminated cooperatively.
If your single item processing takes too long, then multiprocessing of work-items is an option, as you can kill an external process.
code :
import socket
import select
from collections import deque

host = "localhost"
port = 5005
backlog = 5
BUFSIZE = 4096
q = deque()


def read_tcp(s):
    conn, addr = s.accept()
    print('Connected with', *addr)
    while 1:
        data = conn.recv(BUFFER_SIZE)
        if not data: break
        print("received data:", data)
        conn.send(data)  # echo
    conn.close()
    if (data == 'finish'):
        processP(q)
    else:
        q.append(data)

def read_udp(s):
    data,addr = s.recvfrom(1024)
    print("received message:", data)
    del q[-1]


def processP(q):
    text = q.popleft()
    textReverse = text[::-1]
    print(textReverse)

def run():
    # create tcp socket
    tcp = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    tcp.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    try:
        tcp.bind((host,port))
    except socket.error as err:
        print('Bind failed', err)
        return
    tcp.listen(1)
    # create udp socket
    udp = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP
    udp.bind((host,port))
    print('***Socket now listening at***:', host, port)
    input = [tcp,udp]
    try:
        while True:
            print("select.select")
            inputready,outputready,exceptready = select.select(input,[],[], 0.1)
            for s in inputready:
                if s == tcp:
                    read_tcp(s)
                elif s == udp:
                    read_udp(s)
                else:
                    print("unknown socket:", s)
    # Hit Break / Ctrl-C to exit
    except KeyboardInterrupt:
        print('\nClosing')
        raise
    tcp.close()
    udp.close()

if __name__ == '__main__':
    run()


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Problem with deque: map<..., deque<> > fails, but vector and list aren't?

Problem with deque: map<..., deque<> > fails, but vector and list aren't?


By : user3479690
Date : March 29 2020, 07:55 AM
Hope this helps You have defined a copy constructor in someClass but no assignment operator.
As soon as something "interesting" happens to the objects, you will leak the old values and then have two objects pointing to the same complexClass. When the first of those deletes its pointer, all the copies will have invalid pointers!
Sending OSC message bundles from C# and receiving in Processing got weird address pattern and errors

Sending OSC message bundles from C# and receiving in Processing got weird address pattern and errors


By : Chris Tapley
Date : March 29 2020, 07:55 AM
it should still fix some issue Hmmm... not sure exactly, but you could just use OSCeleton. It comes with a Processing example - I've used it before, and it works fine.
(the example may also help you understand how to use the OSC address patterns correctly... )
Akka actor is processing the second message before processing the first message

Akka actor is processing the second message before processing the first message


By : Priya
Date : March 29 2020, 07:55 AM
this will help Akka does not guarantee that messages are delivered in the order they are sent globally. It guarantees the following:
at-most-once delivery (i.e. no guaranteed delivery, messages may be dropped) message ordering per sender–receiver pair
Is possible to use std::deque::push_back() and std::deque::front()/std::deque::pop_front() on different threads without

Is possible to use std::deque::push_back() and std::deque::front()/std::deque::pop_front() on different threads without


By : yesimbig
Date : March 29 2020, 07:55 AM
wish helps you If you are not synchronizing between readers and writers, there is a possibility of data corruption.
So the answer in general is NO.
Does Scala have Double Side Queue similar to Java Deque or Python deque?

Does Scala have Double Side Queue similar to Java Deque or Python deque?


By : Michael
Date : March 29 2020, 07:55 AM
help you fix your problem Does Scala have Double Side Queue similar to Java Deque or Python deque? , You can you scala Vector as deque.
code :
val v = Vector(1,2,3)
v :+ 4 // Vector(1, 2, 3, 0)
0 +: v // Vector(0, 1, 2, 3)
v.drop(1) // Vector(2, 3)
v.dropRight(1) // Vector(1, 2)
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