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Questions and Answers
What is considered synchronous in message passing?
What is considered synchronous in message passing?
- Non-blocking send
- Blocking send (correct)
- Asynchronous message passing
- Non-blocking receive
What is a process in the context of an operating system?
What is a process in the context of an operating system?
- A program that is compiled but not executed
- A program that is waiting for I/O
- A program that is terminated
- A program in execution (correct)
What happens when both send and receive are blocking?
What happens when both send and receive are blocking?
- Non-blocking send
- Rendezvous (correct)
- Asynchronous message passing
- Message loss
What is the primary difference between shared memory and message passing?
What is the primary difference between shared memory and message passing?
What is the purpose of a blocking receive operation?
What is the purpose of a blocking receive operation?
What is the advantage of non-blocking send over blocking send?
What is the advantage of non-blocking send over blocking send?
What is a key characteristic of client-server communication?
What is a key characteristic of client-server communication?
What type of system call is used to perform process creation and termination?
What type of system call is used to perform process creation and termination?
In a producer-consumer system, what is the role of the producer?
In a producer-consumer system, what is the role of the producer?
What is the purpose of message passing in interprocess communication?
What is the purpose of message passing in interprocess communication?
What is the purpose of pipes in interprocess communication?
What is the purpose of pipes in interprocess communication?
What is the purpose of kernel modules in an operating system?
What is the purpose of kernel modules in an operating system?
In a producer-consumer problem with an unbounded buffer, what is the primary responsibility of the producer process?
In a producer-consumer problem with an unbounded buffer, what is the primary responsibility of the producer process?
What is the primary mechanism used for interprocess communication in shared memory?
What is the primary mechanism used for interprocess communication in shared memory?
In a bounded buffer, what happens when all buffers are full and the producer process wants to produce more information?
In a bounded buffer, what happens when all buffers are full and the producer process wants to produce more information?
What is the primary challenge in using shared memory for interprocess communication?
What is the primary challenge in using shared memory for interprocess communication?
In a client-server system, which process is responsible for providing the service?
In a client-server system, which process is responsible for providing the service?
What is the primary advantage of using message passing for interprocess communication?
What is the primary advantage of using message passing for interprocess communication?
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Study Notes
Message Passing
- A link can be associated with at most two processes
- Only one process at a time can execute a receive operation
- The system can select arbitrarily the receiver, and the sender is notified who the receiver was
Blocking and Non-Blocking
- Message passing can be either blocking (synchronous) or non-blocking (asynchronous)
- Blocking send: the sender is blocked until the message is received
- Blocking receive: the receiver is blocked until a message is available
- Non-blocking send: the sender sends the message and continues
- Non-blocking receive: the receiver receives a valid message or a null message
Combinations of Blocking and Non-Blocking
- If both send and receive are blocking, we have a rendezvous
- Different combinations of blocking and non-blocking send and receive operations are possible
Producer-Consumer Problem
- A paradigm for cooperating processes: producer process produces information consumed by a consumer process
- Two variations: unbounded-buffer and bounded-buffer
IPC using Shared Memory
- An area of memory shared among processes that wish to communicate
- The communication is under the control of the user processes, not the operating system
- Major issues include providing a mechanism to allow user processes to synchronize their actions when accessing shared memory
Bounded-Buffer Solution
- Shared data is used to implement a bounded-buffer solution
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