WEBVTT 00:04.980 --> 00:09.210 So guys, now let us do one small assignments on thread listeners. 00:09.480 --> 00:15.000 So in this example or in this assignment, we will going to create a small application called listener 00:15.000 --> 00:15.920 main dot exe. 00:16.170 --> 00:16.860 Right. 00:17.040 --> 00:21.120 This application would going to listen on multiple events at the same time. 00:21.660 --> 00:27.690 So what we will going to do is that that our listener main dot exe application would going to launch 00:27.690 --> 00:28.950 two listener threads. 00:29.250 --> 00:32.790 Both the listener threads listens on an IP address. 00:32.790 --> 00:40.010 127 .0.0.1 and on UDP port number 3000 and 3001 respectively. 00:40.020 --> 00:40.710 Right. 00:40.710 --> 00:46.080 So we will going to launch two packet listener threads and both the packet listener threads would going 00:46.080 --> 00:49.200 to listen on an IP address and UDP port number. 00:49.470 --> 00:54.150 Now our application will have a function called packet receive function. 00:54.150 --> 00:54.840 Right? 00:54.840 --> 01:01.260 And the purpose of this packet receive function is to process the packet which our application is receiving 01:01.260 --> 01:02.700 from the outside world. 01:02.910 --> 01:08.830 So what our packet listener thread is supposed to do is that they will going to listen on an IP address 01:08.830 --> 01:14.740 and port number and once these packet listener thread receives the packet from the outside world, it 01:14.740 --> 01:22.450 is the responsibility of these packets to inject or pump those packets into the application main code 01:22.450 --> 01:26.500 so that our application can process those packets right. 01:26.680 --> 01:32.650 Now in this function that is packet receive function, you don't have to write some sophisticated code 01:32.650 --> 01:35.440 to parse or process the packet. 01:35.470 --> 01:39.640 It is enough that you simply print some message that you have received some packet. 01:39.640 --> 01:42.430 For example, you can print the packet size, right? 01:43.580 --> 01:49.160 Packet receive function is simply the representation that our main application is receiving the packets 01:49.160 --> 01:52.730 from the outside world via packet listener threads. 01:52.730 --> 01:53.480 Right. 01:53.780 --> 01:58.370 Then also our application must be in a position to interact with the user. 01:58.370 --> 02:04.040 So we will going to launch a third thread called user interaction thread and its responsibility will 02:04.040 --> 02:08.570 be only to receive inputs from the user and act on those inputs. 02:08.570 --> 02:09.230 Right? 02:09.410 --> 02:14.870 So in order to design this application, you need some socket programming because you would going to 02:14.870 --> 02:19.640 launch packet listener threads which will going to listen on the sockets, right? 02:19.640 --> 02:26.270 So for that I have provided the library network utils, storage and network utils dot c in this files 02:26.270 --> 02:31.970 you have two APIs, UDP server create and start and UDP send message. 02:31.970 --> 02:32.630 Right? 02:32.870 --> 02:36.800 You need to use these APIs in order to accomplish this assignment. 02:37.520 --> 02:43.130 I have also provided a separate executable called UDP sender dot x. 02:43.130 --> 02:43.730 Right. 02:43.730 --> 02:51.650 Using this executable you can actually generate UDP packets which are targeted to port number 3000 or 02:51.650 --> 02:52.280 3001. 02:52.280 --> 02:52.880 Right? 02:52.880 --> 03:00.020 So you can use UDP standard dot x, which is already cooked up application in order to send packets 03:00.020 --> 03:05.930 to your listener main dot x application and test whether your application is working as expected or 03:05.930 --> 03:06.560 not. 03:06.560 --> 03:07.310 Right? 03:07.790 --> 03:11.840 So let us code up the listener main dot x and see things in action. 03:11.840 --> 03:14.120 And of course this section needs that. 03:14.120 --> 03:17.150 You have some basic background in socket programming. 03:17.270 --> 03:24.080 So now in the next lecture video, let us see how to write listener underscore main dot x application 03:24.080 --> 03:29.600 and after that there will be some couple of assignments in which you will going to add up some additional 03:29.600 --> 03:33.590 logistics to this multiple events listening application. 03:33.590 --> 03:34.220 Right.