4.1 Race Condition in Process Synchronization in OS

[@KNOWLEDGEGATE_kg]

For complete Operating System, check out this video: kzbin.info/www/bejne/rqjCgKiFnc-Uq9k

[@sunilreddy146]

My left ear found this video very insightful.

[@Pikkuji]

Thank you Sanchit Sir for explaining these many concepts of OS in a very convenient way. I personally believe using Hindi and English in explanation must have helped larger audience in understanding these concepts. Although I have been working on Networking companies for 5+ yrs yet there used to be confusions in understanding few basic concepts and terminologies wrt OS used in our programs. But now I am confident enough with those terms like Paging, Logical Addresses, Physical Addresses, Address translations, Race conditions and Semaphores. Thank you again for sharing these videos.

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[@aamirnagauri8270]

i dont know why we give lacs of money to college.... for poor teachers... but sir your explanation is great ....

[@nikhilshrivastava9413]

aisa hai to sanchit sir se hee degree lee loo(Sanchit Institution of Technology)

[@tanzeemakhter3154]

@@nikhilshrivastava9413 😂😂

[@LetszGoo]

yes true... just in the name of degree we give almost 1.5lc per semester .

[@rizwanullahmuhammad7301]

can listen the sound only in one side of the headphone

[@joy-jc1cl]

Rizwanullah Muhammad me too

[@prateekpathak7135]

Same here

[@vivekiyer9273]

Go to windows (windows 10 October update) settings and try to find mono audio option. OR if you are using android device then go to Setting->accessibility ->mono audio Turn it on. Now you can listen the audio in both headphones.

[@MOHAMMADYUNUSBCE]

I thought that my ear phones are gone which I have purchased recently😱. I had a little heart attack😅. Now im ok after reading your comment😂.

[@sohelkhanmansuri.]

Me too😂

[@ritithakur3502]

A certain computation generates two arrays a and b such that a[i]=f(i) for 0 ≤ i < n and b[i]=g(a[i]) for 0 ≤ i < n. Suppose this computation is decomposed into two concurrent processes X and Y such that X computes the array a and Y computes the array b. The processes employ two binary semaphores R and S, both initialized to zero. The array a is shared by the two processes. The structures of the processes are shown below. Process X: Process Y: private i; private i; for (i=0; i < n; i++) { for (i=0; i < n; i++) { a[i] = f(i); EntryY(R, S); ExitX(R, S); b[i]=g(a[i]); } } Which one of the following represents the CORRECT implementations of ExitX and EntryY? (A) ExitX(R, S) { P(R); V(S); } EntryY (R, S) { P(S); V(R); } (B) ExitX(R, S) { V(R); V(S); } EntryY(R, S) { P(R); P(S); } (C) ExitX(R, S) { P(S); V(R); } EntryY(R, S) { V(S); P(R); } (D) ExitX(R, S) { V(R); P(S); } EntryY(R, S) { V(S); P(R); }

[@143sumitkumar]

Thank you sir because of you I was able to score 100% marks in operating System. Looking forward to gain knowledge from other topics. Thank you very much. You are doing a great job.

[@AKARSHANful]

You such a savior, you teach in much better way than our lecturer. Great work and Thanks.

[@kumarkrishna2117]

from the day 1 i had huge doubts on synchronization, by this video, I have comfortably learnt the topic. Thanks a lot.

[@raviraja2691]

Before watching knowledge gate i was struggling in process synchronization but After I feel confident in the same... thank you, sir!

[@KNOWLEDGEGATE_kg]

Hi Ravi, we are glad that we could help in understanding the concept, We upload more topics every week, Please subscribe this channel for best GATE tutorials. :)

[@myhplaptop8090]

I'm Arjun an engineering aspirant in the year of 2022 , and watching your videos of 2016 ,but in this time also your video an adorable and understanding from point of student, A BIG THANK OF U SIR

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Glad to hear that dear 😍 Thanks a lot, keep learning & supporting ! Do visit our website www.knowledgegate.in for more amazing contents & courses 👍😊

[@KaranMehta2594]

Everything was explained clearly , all the doubts are solved in the video itself. #GATE2017Squad !

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Hi Karan, we truly appreciate your kind words for our efforts.We upload more topics every week, Please subscribe this channel for best GATE tutorials. :)

[@SuvaraSurabhi]

Wah....your method of teaching is too much simple....at the understanding level best...good job...thank you very much...and please keep it up

[@ritvikdayal5970]

Watching the video first tym Sneezed the same moment you did 😂😂😂 *connection established *

[@sunnyjain630]

sir your switching from hindi to english is mind blowing teaching in such a simple manner is outstanding. Thanking you sir and please if possible provide some more videos on Algorithms..!!!

[@ishtahuja4160]

BEST VIDEO AND BEST EXPLANATION I HAVE SEEN .....THANKS AND KEEP IT UP. V NICE TEACHING SKILLS AND BEST THING IS U R SHARING MAY GOD BLESS U AND GIVE U MORE IN LIFE

[@LogicalProgrammer]

bahut purana video he , less confidence as compared to now a days , BUT Excellent explanation .

[@jaydeepdas3882]

Increase the video speed, u can feel the confidence compared to normal😁😂😋

[@vforveerji]

Sir explain in mixed form Hindi and English..Its easy for everyone Thanks for these Lectures..Help a lot

[@himanshupatidar9413]

to listen the sound in both sides plug in the pin partially into the audio jack.

[@rajatverma6998]

Thanks

[@kanishkamakhija9046]

sir you really teach very very well.... you leave us with no doubt.... excellent teaching

[@jaideeprohtak3388]

Hi Sanchit, u are doing a great job. I have watched and learned a lot from your knowledge filled videos. Really admire your work. Thank you for clarifying so many doubts via these....

[@ChessMemer69]

Sir aap best ho! Me bhi aapke jaise banna chhatha hu! U r the best sir!!!!!!!!!!!!!!!!!!!

[@jyotipundir356]

Sir you have explained such complex topic in very easy manner. Thanku so much Sir. great job

[@HoneySingh-vp8hs]

quite informative and the only option to cope up with exam pressure. thnks

[@anantmohan3158]

sir when are you going to post...???becoz we really need all those videos....sir we ll be greatful to you...sir your lectures are totally different and very easy to grasp all those concept which are very critical to understand.....so plzzz sir post others video too

[@AbhishekSingh-rt7op]

ONE OF THE BEST TEACHER .

[@DevasishGhosh]

Thank you Sir for making it so easy. All the videos are just awesome. Great Work!!

[@KNOWLEDGEGATE_kg]

Hi Devasish, Thank you so much for your encouraging words. :)

[@hamzanasirr]

Great videos. But there is a sound issue in your vids. Sound can only be heard from the left speaker. Other than that. Your content is awesome. I wish our professor would teach us like that. Stay blessed and keep rocking!

[@mdahsan5854]

sir its always good to see your videos....its very helpful...thanks a lot

[@ranaiqra5189]

sir ur teaching method is soooo good and ur lecture is also V perfect i fully got it the whole lecture

[@shaharekunal]

sir....superb work!!! awesome job!!!please upload more videos of important topics of algorithm....

[@KNOWLEDGEGATE_kg]

Hi Kunal,we truly appreciate your kind words for our efforts :) we shall upload soon :)

[@nimishgupta5289]

sir you should have JOIN button on your channel where we can donate money to you for your hard work... Who else agree??

[@mathlover7688]

Now it is added

[@meeko_ta]

thank u so much sir...... u bring hope to the non-attenders n it's very clear and to the point

[@hiren737]

hello sir please add videos about introduction of OS and OS structures such as monolithic,layered, client server, virtual machines. you are a great teacher

[@sandeepakg]

Very simple and conceptual lecture. Thanks a lot Sanchit !

[@saminmomin3220]

Sir your explanations of each and every topic are amazing and they are so easily understandable by the students. (I would also like you to say that you seem like doppleganger of Rajat Sharma of India TV.)

[@subrataroy8278]

Sir your lecture is very good for Gate exam. please Sir upload video on virtual memory management techniques

[@KNOWLEDGEGATE_kg]

Hi Subrata, we truly appreciate your kind words for our efforts. We are working on Virtually Memory. Please subscribe our channel to follow all updates.

[@Amit-bn3nd]

sir ur videos are just amazing.thanx.i request if u can please make one video on dining philosopher problem and its solution.thanking u in advance

[@meghathukral5859]

Very lucid and instructive video

[@kritikamadhwani2836]

you made my work so easy ...thanks sir 👌👌

[@muhammadfarhangoraya7899]

Your explanation is very good....Kindly upload a lecture on Mutex Locks

[@ShivamShiv007]

Sir ..your lectures are awesome.....thanks a lot 4 this sir...

[@devanshchandra1186]

Sir please upload videos on Virtual memory also. Your videos are really helpful.

[@pavansaichitikina7034]

These videos are very helpful but what I would like to suggest is "try to teach everything in English" so that maximum students may get benefitted by your lectures. Thank you

[@amitrawat8075]

People looking for lectures in English have got whole world to explore..

[@LivEasyIN]

Wah👌 I appreciate your knowledge and methodology of teaching

[@manojrajak1103]

Your explanation is very good.Learned a lot form these videos. Sir, can you upload lectures on segmentation and page replacement algorithms .

[@abhishekguptasarma2060]

For those who are using headphones or earphones on PC/Laptop- Turn on Headphone virtualization from Realtek HD Audio Manager.

[@SumantaOnAir]

ery very very helpful sir.....please arrange some lectures on disk management...your lectures just changed my style of study..amazing....

[@ashfaqahmed-ql8rj]

Awesome sir wanna more of ur videos on subjects like TOC

[@soumikghosh8930]

Sir your explanations are just awesome. Everything got cleared after watching your videos. Sir please Upload some videos on Dining Philosopher Problem And Its Solution . Then it will be very much helpful for us. Thank You Sir.

[@raazjaiswal4270]

thank you for semaphore videos, its help me a lot to solve the gate questions

[@ShubhamSingh-ot4yy]

Sir, You have my respect. Amazing explanation.

[@saltmine8747]

Thankyou sir! I like your way of teaching especially the examples you explain twice time but sir please make complete courses lectures. :-).

[@kushmeetsinghsaluja6787]

Thanku sir for such a nice videos.....these videos helped me a lot...its my request to kindly upload more videos on page replacement algo,virtual memory,thrashing and scheduling algo. Thanks a lot.

[@SruVekDiaries]

awesome video. really understood the concept sachit by the way u use hindu to explain it. keep on using it bcz it will last for so long in a memory and is very easy to understand as well

[@vnsshorts7119]

thanks Sir . Your videos are quite helpful for me..I want to learn about long term scheduling,medium term scheduling and short term scheduling.please upload these topic related videos. thank you Sir.

[@WASEEMGULZAR]

PLEASE MAKE A VIDEO SERIES ON DATA COMMUNICATION, NETWORKING AND COMPUTER ARCHITECTURE. THANK YOU SIR FOR ALL THESE EFFORTS YOU PUT INTO.

[@enjoylearning154]

Sir we want to listen this video only please enable the sound, because here you have explained in detail but in 6 hour video you have explained briefly

[@yogitashinghrakhiya1523]

sir ur concepts r awsm...really thnkful to u...

[@kuldeepgupta7519]

well explained.... n nice presentation..

[@rudrapratapsingh1725]

Sir sound nhi aata h kuch lature me ...sir ap ache se topic Ko clear Kara dete ho sir nice...

[@ArjunSoota]

turn on MONO AUDIO in your system settings for a better audio experience!

[@ansarishahnawaz2296]

Sir aap k video k help se hum GATE k prepration achi tarah se hojaega......... Sir plz reply

[@saurabhshrijan1997]

sir your explanation is very good please upload all the topics of this course...please...

[@apurvpatel2962]

Your explanation of the concept is excellent. I would like to have videos of the subject Computer Networks. If possible before june 2017. Me and my frnds are viewing your videos to prepare for our exams, be it mid semester or end semester exam. If you can upload videos on computer networks before june, it would be a great help and we would be grateful to you.

[@yuvrajsandip3441]

Thank You Sir.You are doing a great job.

[@KNOWLEDGEGATE_kg]

Hi Yuvraj, Thank you so much, would like to hear more from you. We upload more topics every week, Please subscribe this channel for best GATE tutorials. :)

[@subhankarsenapati5804]

Sir please upload lectures on HPCA(High performance computer architechture).There have no tutorial on this subject.so if u upload videos on HPCA both the student and your channel will be benifitable.

[@vivekiyer9273]

FIX AUDIO PROBLEM!!! Go to window's (windows 10 October update) settings and try to find mono audio option. OR if you are using android device then go to Setting->accessibility ->mono audio Turn it on. Now you can listen the audio in both headphones.

[@manojpawaiya2912]

Vivek Iyer good👍

[@danishali3737]

you are Great sir..nice explanation..Thank you Sir.

[@prashantyadav2353]

SIR PLEASE UPLOAD COMPUTER ORGNISTAION AND OTHER SUBJECTS OF CS ,,,,,,,,,,,,,VERY GOOD EXPLANATION THANKU SIR

[@KNOWLEDGEGATE_kg]

Hi Prashant, thank you so much for appreciation, we will upload soon :)

[@prashantyadav2353]

SIR PLEASE SUGGEST BE ERROR FREE OBJECTIVE QUESTION BOOK TO PRACTICE QUESTION OF CS ,,,,,,,,,,,,,,,THERE IS COMPUTER TEACHER EXAM DSSSB ,,,,,,,,,,,,THERE IS 100 QUESTIONS FROM COMPUTER SCIENCE ,,,,,,,,,,,,PLEASE TELL ME PRACTICE BOOK,,,,,,,,,,,,,IF YOU HAVE ANY BOOK WRITTEN BY SUGGEST ME I WILL BUY

[@prashantyadav2353]

I AM WAINT FOR YOUR REPLY SIR

[@sobhanthakur4]

explained very beautifully... superLike :)

[@teenagemania]

@KNOWLEDGE GATE please do work on the subs earlier. I am barely making do with your looking at your actions and what you write on the board. Yours is so far the best vid for this topic even-though some of it is in HINDI. Thanks.

[@destructivestories2874]

sir g please aap jldi se hindi mein videos bna dijiye.....mein hr roz apki wait kr rha hoon.......hr din lgta hai aaj apne hindi channel bna diya hoga.....mgr nhi....so ...please sir g meri friyaad sun lo......please please please please please please

[@arpitabiswas2521]

sir this is very helpful. thanks for your time and effort to make sure we understand.sir please update us on topics like noncontiguous memory.. lru algorithm, fifo algorithm & other algorithms associated with memory management. it will really be helpful.

[@vaibhaVSharma-xh5ru]

A QUESTION: sir i watched all of your video regarding this subject , i just have one question for which i returned to this video, sir at 6:25 you said executing process in mixed fashion creates a problem so we have to consider mutual exclusion ,OK sir my question is, why mixed fashion is a problem, means in mixed fashion both takes the original value of "a", without interfering other process value , so isn't it good that both process takes the original value of"a" instead of taking value, which is altered by other process SIR PLEASE DO REPLY Its like ramayan hoo gaye raam kon tHA PAta nee

[@ritithakur3502]

Sir kindly make lecture on counting semaphore how to solve this question . The P and V operations on counting semaphores, where s is a counting semaphore, are defined as follows: P(s) : s = s - 1; if (s < 0) then wait; V(s) : s = s + 1; if (s

[@AMOLPALAV44]

crystal clear explanation sir, ty.

[@gaytreepatel6528]

Race Condition occurs when more than one process are reading/writing shared data/file then resultant data will depend upon who runs precisely when. It is called as Race Condition.

[@joydeepnath2207]

sir, your videos are too good..pls upload videos of deadlock and memory management

[@joydeepnath2207]

Thank u sir

[@NehaYadav-ge8ob]

Your all videos are very useful.there is serial number is missing in OS lectures so that we can understand which will come after what?

[@amarkashyap2984]

i would suggest you to complete a series if you have started something dont switch or leave incomplete.

[@rishinith]

Very Nice explanation.

[@virendrakhade12]

Very nice explanation !!

[@juhiagarwal4700]

Sir kindly upload the lectures on paging in operating systens..your lectures are really awsum..i want to study from your lectures only

[@bhawnasadhwani9730]

sir u teach really well

[@neerajkushwah9999]

I like way of your teaching especially the examples you explained , your explanation is superb sir . plzzz upload more video's on Graph theory. Thank you sir.

[@KNOWLEDGEGATE_kg]

Hi Neeraj We Will upload the Graph theory topics very soon.

[@kajalchawla7839]

Sir,Please post the video regarding deadlock , dining philosopher problem and also some problems asked in gate.

[@anubhaagrawal8218]

Sir Ur tutorials is too good But I hv a rqst pls upload tutorials in Hindi also. This will very helpful for my Ugc net exam. Pls sir it's a humble rqst.

[@sourishsengupta8812]

Can't hear sound...please fix

[@nuwaniaththanayake8963]

Very understandable..Thank you..!

[@abhishekpandey7806]

Hello Sir, i follow all your videos, all of them are great. Please upload OS Segmentation and Virtual memory management videos.

[@Krishankumar-cd1if]

superb sir ji.....!!!!!!!!!!!!

[@glam.growth.gourmet]

Sir, your videos have really helped me understanding the basic concepts of operating sytems better... kindly upload a video on segmentation of memory...thankyou:)

[@saiharshitha2904]

thank you sooooo much sir, u really made my preparation for tomorrow's exam sooo easy

[@crczr]

please clarify what the correct execution order should be. let us say resources are not being shared, now at first p1 executes and we get 10, then definitely p2 will output 11 as the result, which is not correct. the definition of race condition is correct but we get inconsistent result not because of shared resources, but the order of execution. I don't think shared resource did anything wrong in the execution.

[@pavanverma3905]

thank you sir 4 such simple and beautifull lecture......may u plzz upload hardware synchronization videos and some more classical problems of software synchronization like reader writer prblm,dining philosopher prblm?

[@Jeevan_prakash]

This is the First video of knowledge gate 😍 by sanchit Jain sir ❤️🔥

[@piyusharmaus]

awesome explanation sir

[@manoharkumarmahto9070]

Jai Hind,Sir 🙏 ~Youth India

[@praveshshukla2232]

thanks for the video sir , your explaintion is very very good, I request you to kindly provide video on file organization in DBMS (sorry writing comments in OPERATING SYSTEM) section but still b4 gate exams please sir , thank-you

[@KNOWLEDGEGATE_kg]

Hi Pravesh, Thank you so much for showing your interest, We are working on FILE ORGANIZATION. Please subscribe our channel to follow all updates. :)

[@praveshshukla2232]

the moment i watched 1st video i subscribed

[@anshulkathuria8912]

Sir..Great Explanation!! Just a small doubt..In the second case when Process P1 leaves after reading the value of a,it must store it in the general purpose registers which are shared by all the processes. So when Process P2 enters and modifies a it should actually change the content of the same GPU storing the value of a. Now when P1 enters it tries to modify the value of a by adding 1 to the same GP register storing the value of a. So final result should be 12? Where am i thinking wrong here?