Understanding Threads in Processes
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Understanding Threads in Processes

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Questions and Answers

What is the purpose of the 'counter' variable in the code?

  • To terminate thread_func2 after a certain number of iterations
  • To monitor the overall progress of the main function
  • To track the number of times thread_func1 has run (correct)
  • To synchronize the execution of thread_func1 and thread_func2
  • What is the purpose of the 'pthread_cancel(tmp_thread)' function call?

  • To terminate thread1 and thread2 simultaneously
  • To signal the completion of thread_func1
  • To cancel the execution of thread2 after a specific condition is met (correct)
  • To pause the execution of both threads for a given time
  • What is the significance of the 'pthread_join' function calls in the main function?

  • To pause the execution of the main function until both threads are canceled
  • To create new threads for thread_func1 and thread_func2
  • To wait for thread1 and thread2 to finish their execution before exiting main (correct)
  • To synchronize the printing of 'thread number one' and 'thread number two'
  • What is a thread in the context of CPU utilization?

    <p>A basic unit of CPU utilization</p> Signup and view all the answers

    How are threads in a process different from a traditional process?

    <p>Threads share code section, data section, and other OS resources</p> Signup and view all the answers

    What is the benefit of multi-threaded programming in the context of multi-core systems?

    <p>Improves concurrency and more efficient use of multiple cores</p> Signup and view all the answers

    What is the primary difference between concurrency and parallelism?

    <p>Concurrency supports more than one task by allowing all tasks to make progress, while parallelism involves simultaneous execution of multiple tasks</p> Signup and view all the answers

    What is parallelism in computing?

    <p>Execution of more than one task simultaneously</p> Signup and view all the answers

    What is data parallelism?

    <p>Distributing subsets of the same data across multiple cores and performing the same operation on each</p> Signup and view all the answers

    What model allows for optimal utilization of resources and good performance?

    <p>Many-to-Many</p> Signup and view all the answers

    Which API is commonly used in UNIX OSs for thread creation and synchronization?

    <p>Pthreads</p> Signup and view all the answers

    What involves defining and launching a new thread using the pthread_create() function?

    <p>Creating a thread</p> Signup and view all the answers

    What is the purpose of terminating a thread using pthread_exit() or pthread_cancel()?

    <p>Terminating a thread</p> Signup and view all the answers

    What type of threading is done by compilers and run-time libraries rather than programmers?

    <p>Implicit threading</p> Signup and view all the answers

    What method involves creating a pool of threads that await work for efficient processing of tasks?

    <p>Thread pools</p> Signup and view all the answers

    Study Notes

    • Parallelism is a computing concept where more than one task is executed simultaneously.
    • Parallelism can be achieved on a multi-core system.
    • Types of parallelism include data parallelism and task parallelism.
    • Data parallelism distributes subsets of the same data across multiple cores and performs the same operation on each.
    • Task parallelism distributes threads across cores, each thread performing a unique operation.
    • Multi-threading is one way to achieve parallelism.
    • User threads are managed by user-level threads libraries, while kernel threads are supported by the kernel.
    • Multi-threading models include Many-to-One, One-to-One, and Many-to-Many.
    • In the Many-to-One model, many user-level threads are mapped to a single kernel thread. This can result in reduced concurrency and poor performance on multi-core systems.
    • In the One-to-One model, each user-level thread maps to a single kernel thread. This allows for more concurrency and better performance but comes with more overhead.
    • In the Many-to-Many model, many user-level threads are mapped to many kernel threads. This allows for optimal utilization of resources and good performance.
    • Thread libraries provide an API for creating and managing threads.
    • Pthreads is a POSIX API for thread creation and synchronization, and is commonly used in UNIX OSs.
    • Thread ID is the thread analogue to the process ID and is assigned by the Pthread library.
    • Creating a thread involves defining and launching a new thread using the pthread_create() function.
    • Terminating a thread involves either calling pthread_exit() from within the thread or using pthread_cancel() to terminate another thread.
    • Joining and detaching threads are used to manage the execution of threads. Joining allows one thread to wait for the termination of another, while detaching allows a thread to terminate immediately and automatically release its resources.
    • Implicit threading is a method of threading where the creation and management of threads is done by compilers and run-time libraries rather than programmers.
    • Methods of implicit threading include thread pools, fork-join, and OpenMP.
    • Thread pools create a pool of threads that await work, allowing for efficient processing of tasks.
    • Fork-join involves forking multiple threads and joining them together to process a task, allowing for parallelism in a tree-like structure.
    • OpenMP is a set of compiler directives and APIs for C, C++, and FORTRAN that identifies parallel regions of code.
    • Thread cancellation allows for a thread to be terminated before it has finished, allowing for better performance in some cases.
    • There are two general approaches to thread cancellation: asynchronous cancellation and deferred cancellation.
    • In asynchronous cancellation, the thread is terminated immediately.
    • In deferred cancellation, the thread is allowed to periodically check if it should be cancelled, allowing for a more graceful termination.

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    Related Documents

    Process Part2 Printable.pdf

    Description

    Learn about the concept of threads as a basic unit of CPU utilization within processes. Explore how multiple threads can perform various tasks simultaneously and share resources within a process, enhancing the efficiency of applications.

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