CareerCup

blocking of the entire process happens in ULT(user level thread) where the kernel is unaware about the process being split into two or more threads.

I think the answer will depend on the fact that which threading model the system is implementing
1> if it is many to one model -- then it will block entire process.
2> or if it is one to one model -- then other thread will continue their execution

It WILL be blocked if the thread is implemented as a user level thread and will NOT be blocked if it is implemented as a kernel level thread.

depends whether the other threads is waiting on an input from the previously blocked thread. then the other thread will also block. If all the threads are independent in their work, then they wont block

blocking of the entire process happens in ULT(user level thread) where the kernel is unaware about the process being split into two or more threads.

again stupid question.. what means "blocking entire process ?"

process consists of one or more threads. If, for example, a thread which processes the user input is busy on I/O then it would appear to the user that the process is "blocked".

It depends on your program logic if other threads should wait for the thread doing I/O operations at the moment..

Which one is the right and best answer. multiple answers are confusing me.

Kirans answer is the correct one.

Uniprocessor :
--> User level thread : entire process blocks but could be controlled at times using jacketing
--> Kernel level thread : no blocking

Multiprocessor :
No blocking

In linux no thread will be blocked because internal implementation of thread in linux is like a process,each process gets there own time slice for execution

There are two types of threads-
1.user level threads ULT
they run in user mode

2.kernel level thread KLT
they run in kernel mode

Now if a ULT executes a blocking system call,all the threads of process are blocked.
However there is a technique 'jacketing' that can be used to convert a blocking system call to a non blocking system call.

In a KLT , blocking a thread does not block the whole process.

if machine is single processor, whole process will be blocked.

if machine is multi processor, whole process may not be blocked .

e.g. thread1 is executing on Processor 1 ( and thread blocked with I/O operation ), thread2 is executing on processor2 . thread1 & thread2 are executing independently so one thread may not block other thread .