WEBVTT 00:06.030 --> 00:10.040 So guys, now let us start the implementation of the philosopher function. 00:10.050 --> 00:13.950 This function is the starting point of our solution, right? 00:13.950 --> 00:16.800 And this philosopher function is a threat function. 00:17.600 --> 00:23.780 That is, every thread which represents a philosopher will execute concurrently inside this function. 00:23.780 --> 00:24.560 Right? 00:24.830 --> 00:31.280 So to start with the implementation of this function, what is the argument that was passed to this 00:31.280 --> 00:32.090 function? 00:32.120 --> 00:36.800 The argument was simply a pointer to the philosopher, right? 00:36.830 --> 00:40.010 So let us typecast the argument into the philosopher. 00:40.010 --> 00:46.880 And now we already know that our philosopher thread was going to execute inside an infinite loop. 00:47.240 --> 00:48.080 Right? 00:48.170 --> 00:50.720 So that's why we have a while one loop. 00:50.720 --> 00:56.930 And now simply we will going to implement a solution at the highest level, right? 00:56.960 --> 01:05.330 So what I will going to do is that I will invoke an API which says that if philosopher get access to 01:05.330 --> 01:07.220 both the spoons, right. 01:07.220 --> 01:10.340 And I am passing the argument the pointer to the philosopher. 01:10.370 --> 01:16.010 This API returns true if the philosopher is able to get an access to both the spoons. 01:16.010 --> 01:16.760 Right. 01:17.060 --> 01:19.290 So what am I supposed to do here? 01:19.560 --> 01:21.120 I am inside the if block. 01:21.120 --> 01:28.560 It simply means that this particular philosopher has gotten access to both of his spoons successfully. 01:28.560 --> 01:29.310 Right? 01:29.430 --> 01:36.060 So the next step is quite obvious that this philosopher will now enjoy a meal or cake. 01:36.060 --> 01:36.960 Right? 01:37.320 --> 01:40.050 And we already have a sleep. 01:40.050 --> 01:43.890 One function inside this philosopher eat function. 01:43.890 --> 01:48.520 It simply means that philosopher will going to enjoy the meal for one second. 01:48.540 --> 01:54.090 So we satisfy a constraint that was given to us in our problem statement. 01:54.330 --> 01:55.170 Right. 01:55.320 --> 01:58.220 So the next step is again quite obvious. 01:58.230 --> 02:03.300 After enjoying the meal, the philosopher is supposed to release his both the spoons. 02:03.300 --> 02:04.120 Right. 02:04.140 --> 02:10.830 So hence I will invoke an API philosopher, release both the spoons and in this API, this philosopher 02:10.830 --> 02:14.460 is supposed to give up an access to both of his spoons. 02:14.490 --> 02:15.360 Right? 02:15.360 --> 02:23.280 And another constraint that we have was once the philosopher had a slice of the cake, then he should 02:23.280 --> 02:30.180 wait for one second in order to try his next attempt to grab the spoons again. 02:30.330 --> 02:36.270 So it is for this reason that as soon as the philosopher releases his spoons, we will make the philosopher 02:36.270 --> 02:37.710 sleep for one second. 02:37.740 --> 02:38.430 Right? 02:38.430 --> 02:43.380 So this is another constraint that our solution should satisfy, right? 02:44.870 --> 02:49.550 So you can see that this completes the implementation of the philosopher function. 02:49.580 --> 02:53.190 The things are pretty much quite obvious and simple. 02:53.210 --> 02:56.360 We are implementing the solution in a way. 02:56.360 --> 03:00.350 We think about the solution of a problem statement in our mind. 03:00.440 --> 03:01.220 Right? 03:02.990 --> 03:09.470 So this is how you should try to implement multithreaded programs by creating a layer of abstraction 03:09.470 --> 03:10.040 here. 03:10.040 --> 03:17.330 At this point of time, we have not yet discussed the implementation of these APIs, but we know what 03:17.330 --> 03:19.370 these APIs do, right? 03:19.370 --> 03:25.130 So we are able to code up our highest level function that is philosopher function using these supporting 03:25.130 --> 03:26.000 APIs. 03:26.240 --> 03:32.090 Now we will dive deep into the implementation of these two APIs a step by step, right? 03:32.330 --> 03:35.210 So this covers the first part of our solution.