Frequent question: Which of the following is used for inter process communication in Unix?

Q. Which of the following features of UNIX may be used for inter process communication?
B. pipes
C. semaphore
D. all of these
Answer» d. all of these

What is inter process communication in UNIX?

Interprocess communication is the mechanism provided by the operating system that allows processes to communicate with each other. This communication could involve a process letting another process know that some event has occurred or the transferring of data from one process to another.

Inter-process communication in Linux: Shared storage

  • Shared files.
  • Shared memory (with semaphores)
  • Pipes (named and unnamed)
  • Message queues.
  • Sockets.
  • Signals.

Which of the following features of UNIX may be used?

The UNIX operating system supports the following features and capabilities: Multitasking and multiuser. Programming interface. Use of files as abstractions of devices and other objects.

Which is fastest IPC?

Shared memory is the fastest form of interprocess communication. The main advantage of shared memory is that the copying of message data is eliminated.

How do you communicate between processes?

Two-way communication between processes can be achieved by using two pipes in opposite “directions”. A pipe that is treated like a file. Instead of using standard input and output as with an anonymous pipe, processes write to and read from a named pipe, as if it were a regular file.

What are 3 IPC techniques?

Buddy System – Memory allocation technique. Fixed (or static) Partitioning in Operating System. Variable (or dynamic) Partitioning in Operating System.

Why Semaphore is used in OS?

Semaphore is simply a variable that is non-negative and shared between threads. This variable is used to solve the critical section problem and to achieve process synchronization in the multiprocessing environment. This is also known as mutex lock. It can have only two values – 0 and 1.

What is pipe in IPC?

In computer programming, especially in UNIX operating systems, a pipe is a technique for passing information from one program process to another. Unlike other forms of interprocess communication (IPC), a pipe is one-way communication only.

Can two processes share memory?

Yes, two processes can both attach to a shared memory segment. A shared memory segment wouldn’t be much use if that were not true, as that is the basic idea behind a shared memory segment – that’s why it’s one of several forms of IPC (inter-Process communication).

Where is shared memory stored in Linux?

Accessing shared memory objects via the filesystem On Linux, shared memory objects are created in a (tmpfs(5)) virtual filesystem, normally mounted under /dev/shm. Since kernel 2.6. 19, Linux supports the use of access control lists (ACLs) to control the permissions of objects in the virtual filesystem.

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