1 00:00:00,940 --> 00:00:02,060 Hello, welcome back. 2 00:00:02,080 --> 00:00:07,850 In this lesson, we're going to see how to use the ideal task, right? 3 00:00:07,870 --> 00:00:15,880 So the ideal task is one of the default tasks that are created automatically when we when we start our 4 00:00:15,880 --> 00:00:18,700 scheduler, we need not create those explicitly. 5 00:00:18,700 --> 00:00:21,610 Like we create like we create our other tasks. 6 00:00:21,850 --> 00:00:24,360 These tasks are created automatically. 7 00:00:24,370 --> 00:00:25,690 There is the ideal task. 8 00:00:26,020 --> 00:00:30,640 And then there is the task task, which we shall see how they all work. 9 00:00:31,270 --> 00:00:31,630 Right. 10 00:00:31,640 --> 00:00:35,110 I'm going to come to one of our old projects and then make a copy. 11 00:00:36,620 --> 00:00:37,220 Let's see. 12 00:00:38,170 --> 00:00:41,770 Welcome to project number four over here, knownas top priority. 13 00:00:42,160 --> 00:00:48,490 I'll copy and paste over here and then I'll call this number 13, the ideal task. 14 00:01:03,370 --> 00:01:07,620 OK, so it's open over here, going to open me, see over here. 15 00:01:09,860 --> 00:01:16,880 Right, so let's see what this project has, this project has three tasks, all of the same priority. 16 00:01:17,890 --> 00:01:19,390 Right, OK. 17 00:01:19,690 --> 00:01:26,380 And then all of them have their profiles and they simply increment these profiles, and when we run 18 00:01:26,380 --> 00:01:30,060 this, we expect to see all of them executed with the same value. 19 00:01:30,400 --> 00:01:31,380 Let's confirm that. 20 00:01:31,750 --> 00:01:34,510 I'm going to come over here to click over here to build. 21 00:01:37,480 --> 00:01:40,180 It's built successfully a click here to download onto the board. 22 00:01:43,410 --> 00:01:44,400 And then I say, OK. 23 00:01:50,620 --> 00:01:52,380 Then I'll switch over here. 24 00:01:56,510 --> 00:02:00,440 So we have our blue red green click here to run. 25 00:02:01,500 --> 00:02:05,520 As you can see, they are running to have the same rates essentially, so they are sharing the time 26 00:02:05,760 --> 00:02:07,350 running for equal amount of time. 27 00:02:07,860 --> 00:02:09,210 OK, I'm going to come out here. 28 00:02:11,040 --> 00:02:15,240 No, I'm going to come down here to include one function. 29 00:02:17,530 --> 00:02:19,760 I'm going to come down here to include one function. 30 00:02:20,380 --> 00:02:22,830 This is a callback function, meaning dysfunction. 31 00:02:23,740 --> 00:02:29,560 The name has been defined somewhere and we simply need to provide its implementation and we don't need 32 00:02:29,560 --> 00:02:30,280 to call it. 33 00:02:30,730 --> 00:02:33,510 This function is called the application Eido Hook. 34 00:02:34,120 --> 00:02:36,390 So it's a void function. 35 00:02:36,400 --> 00:02:41,050 And then we start with V and then we see application. 36 00:02:41,060 --> 00:02:42,640 I do OK. 37 00:02:44,470 --> 00:02:46,010 And then it takes no argument. 38 00:02:46,540 --> 00:02:47,830 So there's a callback function. 39 00:02:47,830 --> 00:02:49,640 The name has to be exactly the same. 40 00:02:50,080 --> 00:02:58,540 So it is inside this function that we we put the content that we want to execute. 41 00:02:58,870 --> 00:03:00,730 When the scheduler is an ideal. 42 00:03:00,730 --> 00:03:05,680 States and EIDO states basically means there is nothing to execute when the scheduler has nothing to 43 00:03:05,680 --> 00:03:06,280 execute. 44 00:03:07,090 --> 00:03:12,340 Perhaps we could take this opportunity to perform a bit of housekeeping, cleaning up certain things. 45 00:03:12,940 --> 00:03:15,300 We can do that using our idea here. 46 00:03:16,270 --> 00:03:18,700 So I'm going to create a counter for this. 47 00:03:18,700 --> 00:03:21,520 There's this function going to see. 48 00:03:23,190 --> 00:03:24,080 Wycheproof profiler. 49 00:03:25,500 --> 00:03:31,050 Controversy and then a paste over here, I call this I task profiler. 50 00:03:33,880 --> 00:03:40,450 Then I'll copy this and then I'll place this inside, I do Hook. 51 00:03:40,470 --> 00:03:41,100 Where is it? 52 00:03:41,310 --> 00:03:42,030 It's up here. 53 00:03:44,160 --> 00:03:47,600 So we increment this just like we have to incrementing the rest. 54 00:03:48,060 --> 00:03:49,560 Now let's build and see what happens. 55 00:03:49,590 --> 00:03:51,030 I'm going to click over here to build. 56 00:03:54,640 --> 00:03:55,150 And then. 57 00:03:56,470 --> 00:03:58,180 I'm going to click here to go to debark. 58 00:04:02,850 --> 00:04:03,960 And I'm going to switch. 59 00:04:08,070 --> 00:04:15,530 I'm going to order one new profiler to our live expressions when I copy this controversy, then obviously 60 00:04:15,760 --> 00:04:17,670 over here, not quick to run. 61 00:04:19,630 --> 00:04:26,540 Right, we see that nothing is happening, our ideal is not being executed this year. 62 00:04:26,950 --> 00:04:31,840 This implies that the church has no free time to deal with ideal stuff. 63 00:04:32,440 --> 00:04:36,150 OK, let's introduce a Whately. 64 00:04:36,370 --> 00:04:42,120 We saw how to delay or put a task in a block states to wait for a timeout event. 65 00:04:43,120 --> 00:04:45,420 I'm going to say constant tick tock. 66 00:04:47,910 --> 00:04:49,470 And it's quality over here. 67 00:04:54,080 --> 00:05:04,910 And then I'm going to create a delay of 250 Emmis, 250 TM's, and what I want to do is CDMs to Tick's. 68 00:05:08,990 --> 00:05:14,300 And then I'm going to pass 250 times in here, controversy, then control feature based. 69 00:05:15,130 --> 00:05:21,860 OK, now one other thing I'll do is I'm going to disable two of the tasks we're going to deal with just 70 00:05:21,860 --> 00:05:29,670 below or just command the task creation function for red and green and over here, just plus active. 71 00:05:29,690 --> 00:05:31,040 So in blue, I'm going to come here. 72 00:05:31,040 --> 00:05:33,230 And if we delay the task delay. 73 00:05:38,050 --> 00:05:45,880 I'm going to make blue delay for this amount of time, 250, Emmis a copy this, then paste it over 74 00:05:45,880 --> 00:05:48,280 here like this. 75 00:05:51,000 --> 00:05:53,400 OK, so I'm going to click here to build. 76 00:05:55,480 --> 00:05:58,300 We have to address the scene where we could get that from. 77 00:06:00,240 --> 00:06:02,880 Take type appears problematic. 78 00:06:06,250 --> 00:06:08,190 Take a side on this quote. 79 00:06:10,350 --> 00:06:13,290 In expansion of Markku PD, Ms. 80 00:06:14,420 --> 00:06:14,760 Thank you. 81 00:06:14,810 --> 00:06:23,690 Let's see, PDM is on and a to takes OK, over here, I ended up passing this argument here, but this 82 00:06:23,690 --> 00:06:25,250 should be the number 250. 83 00:06:26,090 --> 00:06:28,010 OK, let's build and see again. 84 00:06:29,380 --> 00:06:32,260 We have no erro click here to get onto the boat. 85 00:06:36,810 --> 00:06:38,570 And then I'll switch over here. 86 00:06:40,100 --> 00:06:41,420 OK, let's click to Run. 87 00:06:44,380 --> 00:06:45,280 Click here to run. 88 00:06:46,550 --> 00:06:48,290 No, we simply have to run in. 89 00:06:50,750 --> 00:06:52,450 OK, I don't ask. 90 00:06:52,490 --> 00:06:59,150 It's not running, OK, so let's go to our config file and see if we've enabled Idol task. 91 00:07:00,680 --> 00:07:03,440 To go to our config file, we come by here. 92 00:07:04,760 --> 00:07:12,050 This is how project we come to middleware, or we can go through three artists to see and then we go 93 00:07:12,050 --> 00:07:19,070 to three artists to reach declaration, and then in there we go to config. 94 00:07:21,810 --> 00:07:25,260 Over here, let's see whether we are using Idil TASC. 95 00:07:28,080 --> 00:07:29,540 I do task and neighborhood. 96 00:07:30,720 --> 00:07:37,290 OK, so I do task is disabled here, I'm going to set it to one to enable it to save. 97 00:07:38,080 --> 00:07:38,930 I'm going to come back. 98 00:07:38,940 --> 00:07:40,950 You click here to build. 99 00:07:47,270 --> 00:07:50,450 And then I'll come I'll come over here to debark. 100 00:07:53,760 --> 00:07:54,570 And then switch. 101 00:07:59,350 --> 00:07:59,740 Then. 102 00:08:01,000 --> 00:08:08,960 Around this, you can see our editors are so much free time to work because we have just a single task 103 00:08:09,260 --> 00:08:12,170 and this task goes to sleep for 250 times. 104 00:08:12,500 --> 00:08:16,300 And during the sleep time, the ideal task executes its content. 105 00:08:16,310 --> 00:08:18,470 It performs its housekeeping job. 106 00:08:18,920 --> 00:08:19,730 OK, so. 107 00:08:20,680 --> 00:08:27,280 Before, when we did a NASA experiment to the EIDO task was disabled, so let's just enable these and 108 00:08:27,280 --> 00:08:30,820 go back to the initial stage we started with going to enable this. 109 00:08:30,820 --> 00:08:37,300 And I'm going to comment about the delay that we have in Blue Task and see what happens. 110 00:08:37,570 --> 00:08:38,700 Click over here to build. 111 00:08:38,890 --> 00:08:41,510 Now we have all three tasks and there is no delay. 112 00:08:41,530 --> 00:08:42,880 None of them is going to sleep. 113 00:08:43,570 --> 00:08:44,770 Then I'm going to click here. 114 00:08:46,300 --> 00:08:47,140 To go to debunk. 115 00:08:48,930 --> 00:08:49,650 And then switch. 116 00:08:54,360 --> 00:09:01,110 And then I'm going to click here to run, as you can see, when we have all three tasks and none of 117 00:09:01,110 --> 00:09:07,110 them is being put in the in the blocked state, there is no time to deal with do task. 118 00:09:07,800 --> 00:09:09,570 OK, so how about this? 119 00:09:10,020 --> 00:09:17,700 How about let's just see how well each task goes to sleep four to five times, just like blue going 120 00:09:17,700 --> 00:09:20,280 to enable this delay for each of them. 121 00:09:22,110 --> 00:09:22,560 Right. 122 00:09:24,070 --> 00:09:25,500 Then I'm going to click here to build. 123 00:09:28,110 --> 00:09:28,560 Then. 124 00:09:29,930 --> 00:09:32,110 Going to click here to get onto the board. 125 00:09:34,490 --> 00:09:35,660 Switch over here. 126 00:09:38,850 --> 00:09:40,260 And I'm going to click here to run. 127 00:09:41,400 --> 00:09:47,240 So with this, because they all go to sleep, there is some time to perform IDU task. 128 00:09:47,250 --> 00:09:53,340 So you see I do task running over here and all of them, they execute to go to sleep four to five times. 129 00:09:53,760 --> 00:09:54,170 Right. 130 00:09:54,210 --> 00:10:00,810 So the ideal task is basically for performing certain housekeeping stuff like cleaning memory and all 131 00:10:00,810 --> 00:10:01,170 of that. 132 00:10:02,100 --> 00:10:05,340 And as you can see, this task is not created. 133 00:10:05,520 --> 00:10:10,170 We just call its name and then put our block of code over here. 134 00:10:17,610 --> 00:10:18,690 Over here like this. 135 00:10:21,460 --> 00:10:30,100 So so the question is, how come when we have all the tasks running without delay, I do a task doesn't 136 00:10:30,490 --> 00:10:31,230 run at all. 137 00:10:31,360 --> 00:10:32,710 How is this implemented? 138 00:10:33,430 --> 00:10:34,670 The way this is implemented? 139 00:10:34,690 --> 00:10:38,700 Is that the ideal task has the lowest priority of all tasks. 140 00:10:39,280 --> 00:10:45,460 So if we have our other three tasks with the same priority, which is higher than the ideal task by 141 00:10:45,460 --> 00:10:48,270 that arrangement, ideal task, execute at all. 142 00:10:48,520 --> 00:10:56,300 And we saw this experiment when we were running the the the priority, you know, when we were executing 143 00:10:56,300 --> 00:10:58,740 the project on changing task priorities. 144 00:10:59,080 --> 00:11:02,160 So that is why the EIDO task does not execute. 145 00:11:02,320 --> 00:11:09,790 But when these tasks that have a higher priority than idle tasks go to sleep, then idle task cannot 146 00:11:09,790 --> 00:11:11,060 cannot perform its job. 147 00:11:11,680 --> 00:11:13,840 So that is why we have it working like the. 148 00:11:15,830 --> 00:11:16,290 Right. 149 00:11:16,460 --> 00:11:19,940 So this is all there is, and I'll see you in the next lesson of Neistat.