What is the concept of message passing?
In computer science, message passing is a technique for invoking behavior (i.e., running a program) on a computer. The invoking program sends a message to a process (which may be an actor or object) and relies on that process and its supporting infrastructure to then select and run some appropriate code.
What are the types of message passing system?
Synchronous and Asynchronous Communication Message passing may be blocking or non-blocking also known as synchronous and asynchronous . Blocking send – sending is blocked, until a message is received by receiving process or mailbox. Non-blocking send – sending process sends the message and resumes operation.
What can processes in a message passing system do?
Explanation: Message Passing system allows processes to communicate with each other without sharing the same address space.
What are the two main system calls used in message passing?
Synchronous vs. asynchronous.
How does the object-oriented concept of message passing help to encapsulate the implementation of an object including its data?
How does the object-oriented concept of message passing help to encapsulate the implementation of an object, including its data? The object that sends the message need not know which type of object is addressed. One way of implementing polymorphism is through inheritance and overriding.
What are the desirable features of a good message passing system explain in detail?
Features of Message Passing: – Simplicity: Simple and Ease to use. Simple and Clear Semantics of IPC Protocols of message passing makes it easier. Semantics of Remote should be as close as possible to local communication for ease of use.
Why is it difficult to implement message passing in distributed system?
Processes often need to communicate with each other. This is complicated in distributed systems by the fact that the communicating processes may be on different workstations. The user is unaware that the underlying mechanism for communication is message passing and is able to use the well known shared memory paradigm.
What are the three principal issues in using message passing?
3 we consider three principal issues in message-based computing: naming, sending, and receiving.
What are the different methods used for logical implementation of a message passing system?
Here are several methods for logically implementing a link and the send/receive operations:
- Direct or indirect communication.
- Symmetric or asymmetric communication.
- Automatic or explicit buffering.
- Send by a copy or send by reference.
- Fixed-sized or variable-sized messages.
What is meant by Rendezvous in message passing mechanism?
In synchronous message passing, the components are processes, and processes communicate in atomic, instantaneous actions called rendezvous. If two processes are to communicate, and one reaches the point first at which it is ready to communicate, then it stalls until the other process is ready to communicate.
What are the four main concepts of object oriented programming?
Now, there are four fundamental concepts of Object-oriented programming – Inheritance, Encapsulation, Polymorphism, and Data abstraction.
How can the concept of encapsulation be achieved in the program?
How can Encapsulation be achieved? Explanation: Using access specifiers we can achieve encapsulation. Using this we can in turn implement data abstraction. It’s not necessary that we only use private access.
What are the problems of a message passing system?
FAILURE HANDLING• Loss of Request message• Loss of Response Message• Unsuccessful execution of requestTo overcome these problems• A reliable IPC protocol of a message-passing system is designed.• It is based on the ideas of internal retransmission of messages after time out and• Return of an ACK to sending m/c kernel by receiver m/c kernel. 21
What are the design issues in IPC by message passing?
Message Passing 2. DESIGN ISSUES IN IPC BY MESSAGE PASSING SYNCHRONIZATION ◦ BLOCKING PRIMITIVE (SYNCHRONOUS) : If its invocation blocks execution of its invoker ◦ NON-BLOCKING (ASYNCHRONOUS) : Does not block execution2 cases 1st case ◦ Blocking send ◦ Blocking Rec 2nd case ◦ Non-Blocking Send ◦ Non-Blocking Rec 3.
How does the receiving process know that the message has arrived in the buffer?
ISSUES IN NON-BLOCKING RECEIVE How the receiving process knows that the message has arrived in the message buffer? Done by Polling or Interrupt ◦ POLLING: Receiver uses “test” primitive to allow it to check buffer status ◦ INTERRUPT : When message has arrived in the buffer, a s/w interrupt is used to notify the receiving process 6.
How are cookies used in a distributed computing system?
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