Semaphore Vs. Mutex - A Clear Understanding

[@navya5679]

I finally get what the difference is, after all these years. Will definitely watch this whenever I need to revise.

[@ShriramVasudevan]

Glad Navya. The purpose of my hard work through this channel is getting served when I see these kinds of messages.

[@hrishibhagat3281]

Best way to differentiate between mutex and semaphore Thank you Sir ! Finally I understood Diffeernce between them

[@ShriramVasudevan]

Thanks brother

[@dipanshupayasi790]

Thanks for simplifying this in easier manner. I have got doubt, will be glad you can answer it. Suppose we have three "writing thread" writing a message into a message queue and one "reading thread" which needs to read the message from the queue. So in this case to synchronize the process we can either go ahead with "Binary Semaphore", which will allow only one thread to read or write at a time or using mutex by locking the resource. Now the question is which method should be preferred and why? (in context with RTOS in embedded systems) Thanks in advance :)

[@sbanavasi]

Thank you Dr.Shriram for the very simple and crystal clear presentation on differences between semaphores and mutex. I look forward to your presentation on oneAPI Hands-on Workshop- Let us SYCL. Thank you

[@ShriramVasudevan]

Sure and soon

[@celsiusfahrenheit1176]

God, thank you, you were able to simplify this so well, after watching many videos and reading other resources I finally got it.

[@ShriramVasudevan]

Glad u liked it

[@bandarulekhana2678]

Thank you so much sir once again 😊😊

[@bharathiraja6286]

You saved a lot of time. This clears a lot and lot. Keep doing this!!!

[@ShriramVasudevan]

Glad u liked

[@washiburr9876]

Oh my god. Thank you so much. This was confusing me so much when my professor was explaining it.

[@ShriramVasudevan]

Glad you found it useful..

[@jankeshchakravarthy9389]

Hi Shriram - Nice and very clear video describing the concept of mutex vs. spin locks vs semaphores. I have couple of follow up question/requests 1. Can semaphore, mutex, spin locks work across the processors? For example, if the mutex used by two threads running two different CPUs, will it work? 2. What is the underlying assembly instructions for spin locks? You can take type processor, like ARM.

[@ravikumarsivasankar2735]

Thanks Shriram Vasudevan. The video is very simple and easy to understand. The real life examples are very good

[@ShriramVasudevan]

Thanks Ravi. Glad you liked.. subscribe :)

[@zach6383]

Great explanation and clear english, Thank you!

[@ShriramVasudevan]

Thanks n glad u liked

[@sreevanijalagari3863]

that was super clear!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[@ShriramVasudevan]

Thanks

[@UdayKumar_G]

Simple and crisp explaination . Thanks :)

[@ShriramVasudevan]

Thanks

[@2109abhishek]

best video on youtube to understand the Semaphore and Mutex

[@ShriramVasudevan]

Thanks and great to know you liked it

[@ozanh]

Brilliant explanation sir. It helped me a lot on my RTOS project.

[@ShriramVasudevan]

Glad.

[@SSi934]

Excellent Teaching - So simple.

[@ravikishorepochiraju6973]

Excellent Explanation Appreciate the effort, Thanks and GoodLuck for other Vids

[@ShriramVasudevan]

Thanks brother

[@SkandanKA]

This was so precise and highly effective.. Please continue making more and more videos.. Thanks a lot ❣️

[@ShriramVasudevan]

Thanks and glad you liked it

[@CosmJJ]

Thanks a lot! Crystal clear explanation

[@ShriramVasudevan]

Thanks

[@bandarulekhana2678]

Now i am very very very clear about this topics sir thank you thank you so much sir .......keep going and help the people like us 🙏🙏

[@ShriramVasudevan]

Thanks n glad u liked

[@teamqis7382]

Woowww. Very easy and excellent insights.

[@ShriramVasudevan]

Glad it was helpful!

[@rathanhv4676]

As a fresher it helped me to understand the concept clearly please add more videos on threads.

[@ShriramVasudevan]

Thanks and glad u found it useful

[@profdurgahere9007]

This is one of the best. Hatsoff!

[@TheCoolharry123]

Process and thread word used interchangeably here. Mutex and semaphore used for synchronizing threads in a process. Mutex and semaphore not available across multiple process.

[@srikanthsarjanaa8075]

Such a great explanation 🙌🙌

[@VagaDuo]

Thank you so much for clear explanation. I have one question: In you last point, you told: - When more than one resources available: use Semaphore (that should be counting semaphore). - When only one resource available: use Mutex. Can we not use binary semaphore instead of mutex? Why mutex is preferred over binary semaphore?

[@HimanshuSharma-sd5gk]

Generally semaphore is prone to getting into dead lock

[@techforall9859]

Excellent! The best! Superb.

[@ShriramVasudevan]

Thank you! Cheers!

[@umeshtiwari9249]

clear all doubts in semaphore and mutex. thanks Sir

[@ShriramVasudevan]

Keep watching

[@stith_pragya]

Jai Shree Ram🙏🙏🙏🙏🙏🙏🙏🙏🙏 Excellent explanation...Thanks a ton for the video🙏🙏🙏

[@ShriramVasudevan]

Thanks brother

[@vishalyadav1064]

Thanks a lot. It was little confusing before. Such a clear explanation in this video

[@ShriramVasudevan]

Thanks brother. Glad u liked

[@finalyearprojects4915]

Excellent lesson bro learned lot... thank you

[@ShriramVasudevan]

Glad it was helpful!

[@erigelavani4162]

Sir your explanation is very clear and understandable 👌,Thank you sir keep doing more videos sir.

[@ShriramVasudevan]

Thanks Vani. Glad you found it meaningful

[@saadmanahmed860]

a very good illustration. thanks for such great tutorial

[@ShriramVasudevan]

Thanks

[@Revathy84]

Excellent explaination

[@anasalamin84]

thanks (Shriram Vasudevan) alot for the best explanation that i found on the web I like the symbols you used and the direct simple language you use

[@ShriramVasudevan]

Glad u liked it brother

[@mnbvcxz1621]

simple and neat, please provide more examples.

[@ShriramVasudevan]

Sure and thanks

[@naveendoki3667]

Very good explanation !

[@ShriramVasudevan]

Thanks

[@deeptanudatta7235]

What is the difference between mutex and binary semaphore ?

[@whistlingpalms2240]

Thanks a lot sir... Very helpful...

[@ShriramVasudevan]

Thanks and glad u liked it priyanka

[@cp8245]

Awesomely explained sir. Thank you

[@ShriramVasudevan]

Glad u liked it

[@rohitjadhav512]

Great explanation n English tooo

[@ShriramVasudevan]

Thanks

[@Amunisify]

You have explained it so clearly! I have one question if semaphore and mutex are different then in book “Operating System Concepts” there’s a Bounded buffer problem. In that they have taken three semaphores. And one semaphore is “semaphore mutex = 1” how’s that possible? Can you/anyone explain?? Please.

[@ShriramVasudevan]

I shall go through that and come back to u

[@cheeku5568]

really it was a clear cut lecture...thanks for the nice session...keep posting such clear cut lectures

[@ShriramVasudevan]

Thanks and glad you found it good

[@MegaUncleDrew]

Now when would you choose a binary semaphore over a mutex?

[@biprarshidutta1560]

Great Lecture! However I was surprised you didn't talk about priority inversion in Mutexes only

[@ShriramVasudevan]

Great suggestion! I will make it

[@sakshiwahi2025]

This was the best!

[@ShriramVasudevan]

Thanks shakshi

[@asharafperinchikkal6103]

Nice man ..you did great job 👍

[@ShriramVasudevan]

Thanks and glad u liked

[@sumitnaik1990]

Is it possible to use multiple mutex object when multiple resource are present ? If yes then why we need Semaphore ?

[@ssrmurthysaka6324]

Can we call binary semaphore as a mutex? Because counter value 1 means resource is available when counter is 0 resource is blocked for one process.

[@TheSoorajthevally]

Hello Shriram .. Clean explanation.

[@ShriramVasudevan]

Thanks and glad u liked

[@arun.s1059]

Very good explanation 👍👍👍

[@ShriramVasudevan]

Glad u like.

[@Joyddep]

Thank you Sir, really clear explanation!

[@ShriramVasudevan]

Thanks n glad u liked bro.

[@Amarsharma-n9y]

What happens in case of mutex when we have mutiple resource?

[@aayush5474]

Isn't Mutex and Binary Semaphore the same then because both will allow only one process to access the resource at a time?

[@nathand256]

Insightful! Thanks

[@ShriramVasudevan]

Glad u liked

[@kotamuralikrishna6851]

In ubuntu how to change fonts(tamil, telugu) settings to display

[@balakrishna121]

Lovely explanation

[@ShriramVasudevan]

Thanks and glad u liked

[@KRKUN]

Thanks for explaining that was helpful, if you can improve your accent that will be great

[@muralinagraj1983]

Whether one or more resources we can always use semaphore only rite ? because binary semaphore works good for one resource and counting semaphores works good when there are many resources. Why we have to use mutex and get confused when semaphore works for both ?

[@allmighty2000]

So just tell the MUTEX Is a kind of BINARY Semaphore that’s it , that’s all I needed to know , this subject is so dramatic 😂😂 BTW thanks a lot for this video , loved this

[@preethamdasari]

Nope they are not the same thing.

[@aayush5474]

@@preethamdasari In the OS galvin book the author says on some systems binary semaphore is also called mutex lock

[@askiny6576]

@@preethamdasari the way he explained it, they are the same. did he explain it wrong?

[@techhunter877]

Thanks. This is very informative

[@slowedandreverb2079]

Which one is better for windows10 and linux?

[@ShriramVasudevan]

Linux

[@ankammaraochintala2509]

Thank you

[@ShriramVasudevan]

Welcome

[@indrajansboorlagadda1706]

If we have one shared resource...we can use binary semaphore also instead of mutex...can you tell me where is the exact usage of these semaphore and mutex !?

[@ShriramVasudevan]

Well.. there wont be a fight for the resources

[@adityasahu96]

woah nice explaination !

[@ShriramVasudevan]

Thank you

[@shreyashachoudhary480]

Loved it!

[@ShriramVasudevan]

Thanks❤

[@Amarsharma-n9y]

Is binary semaphore same as mutex?

[@yihan4835]

Very clear explanations.

[@ShriramVasudevan]

Thanks.

[@mostafayasin1]

Thaanks

[@ShriramVasudevan]

Thank you

[@archanao4143]

thank you Soooooo much sir And plz explain abt spin locks also sir.. Plz

[@ShriramVasudevan]

Will be done tomorrow. Glad you liked it...

[@anillone9094]

sir, can we use semaphore for both thread and process? or can we use mutex for both thread and process? means is there any rule that semaphore should be use with process or mutex should be use with thread?

[@pammidhun]

Suppose I have one resource. Then which one I should go for.? Binary semaphore or mutex.? Why.?

[@HritikV]

Mutex, as mentioned in the video. Mutex is simpler.

[@AbhijeeetKumarSrivastavakshiva]

Mutex types?

[@shaikmahammadusman8543]

Good explanation but we need more examples binary semaphore and counting semaphore

[@ShriramVasudevan]

Shall make another video soon

[@vinothkannanr2804]

such a great video

[@ShriramVasudevan]

Thanks

[@shivamkeshri9540]

Great great and only great.

[@ShriramVasudevan]

Thank you.

[@Pages_Perfected]

any summary?

[@jameysiddiqui6910]

so binary semaphore is equal to mutex

[@satyamgaba]

Why is mutex better when there are two resources?

[@pavanv4115]

Please make all os videos

[@ShriramVasudevan]

Pl check the same playlist. All os contents are there.

[@pavanv4115]

Threads virtual memory some important topic are not available

[@ShriramVasudevan]

@@pavanv4115 threads are there. Check. VM i will make soon.

[@roshanrajkumar7827]

Sir can u make a video on virtual memory ...pages and frames??

[@ShriramVasudevan]

Already there. Go through brother

[@srikanthgali9424]

Hi Shriram, I have one query here .. when only one resource is available, which one to choose .. Binray semaphore or Mutex.

[@ShriramVasudevan]

Hi. For a single resource it is Binary Semaphore preferred

[@narayansingh-bu5fk]

@@ShriramVasudevan in last you have conclude that for one resource mutex is preferred so Now for one resource mutex is preferred or binary semaphore ?

[@adithyashankar6562]

Clear explanation. This video is very useful

[@ShriramVasudevan]

Thanks and glad u liked.

[@indramaniarora7901]

So isn't it possible to use semaphores everywhere instead of mutex?

[@ShriramVasudevan]

Yes

[@brandonhughes645]

Why do I even go to university.

[@its_mee_ssr]

Nice explanation

[@ShriramVasudevan]

Thanks brother

[@engineering1year734]

Good video sir

[@ShriramVasudevan]

Thanks

[@elumalair5875]

super sir thank you

[@ShriramVasudevan]

Thanks and glad u liked

[@pea2nuts809]

Problem is audio is too quiet

[@ShriramVasudevan]

Pl use earphones.

[@Gamechanger..601]

Wow... Thanks

[@ShriramVasudevan]

Glad u liked

[@nikolayd4384]

Thank you, sir!

[@ShriramVasudevan]

Welcome bro

[@selflearner8895]

Thank u sir🙏

[@ShriramVasudevan]

Glad u liked

[@sstech6695]

Nice. Concise.

[@hrishibhagat3281]

Sir can I get these slides?

[@ShriramVasudevan]

Lemme see

[@dok.bswamy7504]

👍

[@roshanrajkumar7827]

Sir...who takes care of this..??os huh??btw where is semaphore and mutex stored or implemented???????sec men or RAM?

[@ShriramVasudevan]

OS that is the kernel does everything. You got to code for the semaphore or mutex..it's just a software piece.

[@adeli583]

Thanks Sriram Vasudevan. Can I have your email to communicate you for more lessons?

[@ShriramVasudevan]

Glad you liked it.

[@ShriramVasudevan]

Reach me @ [e-mail]

[@tushargoyaliit]

Nice

[@ShriramVasudevan]

Thanks and glad u liked

[@sumitkumarsagar6876]

nice!

[@ShriramVasudevan]

Thanks.

[@TEXOTALKSPRAVEEN]

superb

[@ShriramVasudevan]

Thanks

[@adigenius04]

Woww! Respect++

[@ShriramVasudevan]

Thanks