Table of Contents
- 1 How is the shared memory model implemented to achieve IPC?
- 2 Why would two processes want to use shared memory for communication instead of using message-passing?
- 3 What is message queue and how it works?
- 4 Which of the following two operations are provided by the IPC facility?
- 5 How do I use message queue in IPC?
Inter Process Communication through shared memory is a concept where two or more process can access the common memory. And communication is done via this shared memory where changes made by one process can be viewed by another process.
How is IPC implemented?
These are the methods in IPC:
- Pipes (Same Process) – This allows flow of data in one direction only.
- Names Pipes (Different Processes) – This is a pipe with a specific name it can be used in processes that don’t have a shared common process origin.
- Message Queuing –
- Semaphores –
- Shared memory –
- Sockets –
How is shared memory implemented?
Shared memory is a feature supported by UNIX System V, including Linux, SunOS and Solaris. One process must explicitly ask for an area, using a key, to be shared by other processes. This process will be called the server. All other processes, the clients, that know the shared area can access it.
Shared memory allows maximum speed and convenience of communication, as it can be done at memory speeds when within a computer. Shared memory is faster than message passing, as message-passing systems are typically implemented using system calls and thus require the more time-consuming task of kernel intervention.
Which of the following two operations are provided by the IPC facility write & delete message delete & receive message Send & Delete Message receive & send message?
Which of the following two operations are provided by the IPC facility? Explanation: Two operations provided by the IPC facility are receive and send messages. Exchange of data takes place in cooperating processes.
Which protocol is supported by queues?
AMQP: The Advanced Message Queuing Protocol (AMQP) is an open standard protocol that works at the application layer allowing message orientation, queuing, and routing, while providing interoperability, reliability and security for sending and receiving messages between businesses and applications.
What is message queue and how it works?
A message queue is a queue of messages sent between applications. It includes a sequence of work objects that are waiting to be processed. Another application, called a consumer, connects to the queue and gets the messages to be processed. Messages placed onto the queue are stored until the consumer retrieves them.
What are IPC mechanisms?
Linux supports three types of interprocess communication mechanisms that first appeared in Unix TM System V (1983). These are message queues, semaphores and shared memory. The key is used as a way of locating the System V IPC object’s reference identifier.
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.
Which of the following two operations are provided by the IPC facility?
Explanation: Two operations provided by the IPC facility are receive and send messages. Exchange of data takes place in cooperating processes. Explanation: Messages sent by a process can be fixed or variable size.
What is shared-memory IPC implementation?
The shared memory IPC means that the processes read and write to a shared physical memory region. The OS is involved in establishing the shared memory channel between the processes, this is implemented by the virtual to physical translation. (2) Shared-Memory IPC Implementation
What is IPC (Inter Process Communication)?
It is a mechanism for a process to communicate and synchronize. Using message passing, the process communicates with each other without resorting to shared variables. IPC mechanism provides two operations: A message queue is a linked list of messages stored within the kernel. It is identified by a message queue identifier.
How do I use message queue in IPC?
IPC using Message Queues. A message queue is a linked list of messages stored within the kernel and identified by a message queue identifier. A new queue is created or an existing queue opened by msgget().
What is message-based IPC?
One model of IPC is called the message passing IPC or message-based IPC. As its name implies, processes create messages and then send or receive them. The OS is responsible for creating and maintaining the channel that will be used to pass messages among processes. The data structure of the channel can be a buffer or a FIFO queue.