[PDF] concurrency mechanism

Concurrency in software engineering means the collection of techniques and mechanisms that enable a computer program to perform several different tasks simultaneously, or apparently simultaneously.
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  • What are the three common concurrency mechanisms?

    A concurrency model defines an abstraction and mechanism to create, manage, and communicate between concurrent tasks.
    Common concurrency models include the thread model, process model, and event-driven model.

  • What are the types of concurrency?

    The three main types of concurrent computing are threading, asynchrony, and preemptive multitasking.
    Each method has its own special precautions which must be taken to prevent race conditions, where multiple threads or processes access the same shared data in memory in improper order.

  • What are the mechanisms to support concurrency?

    Operating systems and devices
    They use concurrency mechanisms such as locks, semaphores, monitors, message passing, and shared memory to ensure correctness and efficiency.
    Devices such as CPUs, GPUs, and IO controllers also use concurrency to perform parallel computations, data transfers, and communication.

  • What are the mechanisms to support concurrency?

    In programming terms, concurrent programming is a technique in which two or more processes start, run in an interleaved fashion through context switching and complete in an overlapping time period by managing access to shared resources e.g. on a single core of CPU.

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concurrency.pdf

Tasks within an application are rarely independent of each other and thus each concurrency mechanism is typically combined with one or more communication.



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