regarding storage classes in C

[patelss23]

Hello All,
how are you?

Can you please make me aware of storage specifiers like volatile, extern, and register ? I know the in what situations they can be used. But till this date I haven't seen any practical example using volatile or register.

can you please let me know ?

Thank you in advance,
Sanket

[sicarie]

As this smells suspiciously of homework, I'm going to ask, what do you think are practical examples?

[patelss23]

As this smells suspiciously of homework, I'm going to ask, what do you think are practical examples?

Hello sicarie,

This is not a homework question. Actually I am done with my graduation already. And I have also got some field experience too. I have started revising C so I can look at things from different perspective.

I read that by keeping your variable volatile any other process can change it. But I haven't come across such situation. So I was wondering where and how such storage specifiers are used.

Thank you

[sicarie]

Cool.

So can you think of any cases where that might be practical?

[patelss23]

Cool.

So can you think of any cases where that might be practical?

Yes .. There are some .....
For example, there are two programs which are using the same resource, it could be a file, some shared area of memory or anything. But What I am not getting is ..... why do we need to keep it volatile ? I havent seen this keyword in any code I have come across. Does this have some relation to access protection mechanism of Operating System ? I am not getting any concrete solution to this.

Thank you,
Sanket