Semaphore Vs. Mutex - A Clear Understanding

Here you go.. The clear differences between Semaphore and Mutex. All the technical aspects are discussed with examples for each.

[@bharathiraja6286]

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

[@ShriramVasudevan]

Glad u liked

[@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 :)

[@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..

[@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.

[@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 😊😊

[@hrishibhagat3281]

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

[@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

[@profdurgahere9007]

This is one of the best. Hatsoff!

[@techhunter877]

Thanks. This is very informative

[@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

[@zach6383]

Great explanation and clear english, Thank you!

[@ShriramVasudevan]

Thanks n glad u liked

[@vishalyadav1064]

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

[@ShriramVasudevan]

Thanks brother. Glad u liked

[@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 :)

[@stith_pragya]

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

[@ShriramVasudevan]

Thanks brother

[@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

[@saadmanahmed860]

a very good illustration. thanks for such great tutorial

[@ShriramVasudevan]

Thanks

[@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

[@ravikishorepochiraju6973]

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

[@ShriramVasudevan]

Thanks brother

[@CosmJJ]

Thanks a lot! Crystal clear explanation

[@ShriramVasudevan]

Thanks

[@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

[@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

[@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.

[@SSi934]

Excellent Teaching - So simple.

[@sumitnaik1990]

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

[@Joyddep]

Thank you Sir, really clear explanation!

[@ShriramVasudevan]

Thanks n glad u liked bro.

[@UdayKumar_G]

Simple and crisp explaination . Thanks :)

[@ShriramVasudevan]

Thanks

[@techforall9859]

Excellent! The best! Superb.

[@ShriramVasudevan]

Thank you! Cheers!

[@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

[@chaitanyapai8245]

Awesomely explained sir. Thank you

[@ShriramVasudevan]

Glad u liked it

[@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.

[@teamqis7382]

Woowww. Very easy and excellent insights.

[@ShriramVasudevan]

Glad it was helpful!

[@asharafperinchikkal6103]

Nice man ..you did great job 👍

[@ShriramVasudevan]

Thanks and glad u liked

[@nathand256]

Insightful! Thanks

[@ShriramVasudevan]

Glad u liked

[@aayush5474]

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

[@sakshiwahi2025]

This was the best!

[@ShriramVasudevan]

Thanks shakshi

[@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.

[@nikolayd4384]

Thank you, sir!

[@ShriramVasudevan]

Welcome bro

[@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?

[@shreyashachoudhary480]

Loved it!

[@ShriramVasudevan]

Thanks❤

[@Adiksha08]

Excellent explaination

[@MegaUncleDrew]

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

[@whistlingpalms2240]

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

[@ShriramVasudevan]

Thanks and glad u liked it priyanka

[@yihan4835]

Very clear explanations.

[@ShriramVasudevan]

Thanks.

[@mnbvcxz1621]

simple and neat, please provide more examples.

[@ShriramVasudevan]

Sure and thanks

[@umeshtiwari9249]

clear all doubts in semaphore and mutex. thanks Sir

[@ShriramVasudevan]

Keep watching

[@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

[@Pages_Perfected]

any summary?

[@naveendoki3667]

Very good explanation !

[@ShriramVasudevan]

Thanks

[@rohitjadhav512]

Great explanation n English tooo

[@ShriramVasudevan]

Thanks

[@sreevanijalagari3863]

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

[@ShriramVasudevan]

Thanks

[@TheSoorajthevally]

Hello Shriram .. Clean explanation.

[@ShriramVasudevan]

Thanks and glad u liked

[@user-bn4up9rt1z]

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

[@sstech6695]

Nice. Concise.

[@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.

[@vinothkannanr2804]

such a great video

[@ShriramVasudevan]

Thanks

[@kotamuralikrishna6851]

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

[@selflearner8895]

Thank u sir🙏

[@ShriramVasudevan]

Glad u liked

[@archanao4143]

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

[@ShriramVasudevan]

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

[@adityasahu96]

woah nice explaination !

[@ShriramVasudevan]

Thank you

[@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

[@ankammaraochintala2509]

Thank you

[@ShriramVasudevan]

Welcome

[@balakrishna121]

Lovely explanation

[@ShriramVasudevan]

Thanks and glad u liked

[@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 ?

[@user-bn4up9rt1z]

Is binary semaphore same as mutex?

[@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 ?

[@slowedandreverb2079]

Which one is better for windows10 and linux?

[@ShriramVasudevan]

Linux

[@biprarshidutta1560]

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

[@ShriramVasudevan]

Great suggestion! I will make it

[@arun.s1059]

Very good explanation 👍👍👍

[@ShriramVasudevan]

Glad u like.

[@Gamechanger..601]

Wow... Thanks

[@ShriramVasudevan]

Glad u liked

[@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

[@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.

[@elumalair5875]

super sir thank you

[@ShriramVasudevan]

Thanks and glad u liked

[@adigenius04]

Woww! Respect++

[@ShriramVasudevan]

Thanks

[@shivamkeshri9540]

Great great and only great.

[@ShriramVasudevan]

Thank you.

[@AbhijeeetKumarSrivastavakshiva]

Mutex types?

[@mostafayasin1]

Thaanks

[@ShriramVasudevan]

Thank you

[@roshanrajkumar7827]

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

[@ShriramVasudevan]

Already there. Go through brother

[@indramaniarora7901]

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

[@ShriramVasudevan]

Yes

[@adithyashankar6562]

Clear explanation. This video is very useful

[@ShriramVasudevan]

Thanks and glad u liked.

[@its_mee_ssr]

Nice explanation

[@ShriramVasudevan]

Thanks brother

[@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?

[@engineering1year734]

Good video sir

[@ShriramVasudevan]

Thanks

[@satyamgaba]

Why is mutex better when there are two resources?

[@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.

[@sumitkumarsagar6876]

nice!

[@ShriramVasudevan]

Thanks.

[@jameysiddiqui6910]

so binary semaphore is equal to mutex

[@KRKUN]

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

[@TEXOTALKSPRAVEEN]

superb

[@ShriramVasudevan]

Thanks

[@finalyearprojects4915]

Excellent lesson bro learned lot... thank you

[@ShriramVasudevan]

Glad it was helpful!

[@hrishibhagat3281]

Sir can I get these slides?

[@ShriramVasudevan]

Lemme see

[@shaikmahammadusman8543]

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

[@ShriramVasudevan]

Shall make another video soon

[@tushargoyaliit]

Nice

[@ShriramVasudevan]

Thanks and glad u liked

[@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]

[@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.

[@SUNILRAJAK183]

nice

[@ShriramVasudevan]

Thanks n glad u liked

[@ayanchakrabarty2595]

wow

[@pea2nuts809]

Problem is audio is too quiet

[@ShriramVasudevan]

Pl use earphones.

[@ANKURBARUA]

That's it !! 😂😂😂

[@ShriramVasudevan]

It's simple:)

[@arvindg553]

Linux devru 💯❤️

[@ShriramVasudevan]

Thanks