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Chapter 5: Threads

Chapter 5: Threads. Overview Multithreading Models Threading Issues Pthreads Solaris 2 Threads Linux Threads Java Threads. Single and Multithreaded Processes. Benefits. Responsiveness Resource Sharing Economy Utilization of MP Architectures. User Threads.

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Chapter 5: Threads

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  1. Chapter 5: Threads • Overview • Multithreading Models • Threading Issues • Pthreads • Solaris 2 Threads • Linux Threads • Java Threads Operating System Concepts

  2. Single and Multithreaded Processes Operating System Concepts

  3. Benefits • Responsiveness • Resource Sharing • Economy • Utilization of MP Architectures Operating System Concepts

  4. User Threads • Thread management done by user-level threads library • Examples - POSIX Pthreads - Mach C-threads - Solaris threads Operating System Concepts

  5. Kernel Threads • Supported by the Kernel • Examples - Windows 95/98/NT/2000 - Solaris - Tru64 UNIX - BeOS - Linux Operating System Concepts

  6. Multithreading Models • Many-to-One • One-to-One • Many-to-Many Operating System Concepts

  7. Many-to-One • Many user-level threads mapped to single kernel thread. • Used on systems that do not support kernel threads. Operating System Concepts

  8. Many-to-One Model Operating System Concepts

  9. One-to-One • Each user-level thread maps to kernel thread. • Examples - Windows 95/98/NT/2000 - OS/2 Operating System Concepts

  10. One-to-one Model Operating System Concepts

  11. Many-to-Many Model • Allows many user level threads to be mapped to many kernel threads. • Allows the operating system to create a sufficient number of kernel threads. • Solaris 2 • Windows NT/2000 with the ThreadFiber package Operating System Concepts

  12. Many-to-Many Model Operating System Concepts

  13. Threading Issues • Semantics of fork() and exec() system calls. • Thread cancellation • Asynchronous Cancellation • Deferred Cancellation • Signal handling • Synchronous signals • Asynchronous signals • Thread pools Operating System Concepts

  14. Pthreads • a POSIX standard (IEEE 1003.1c) API for thread creation and synchronization. • API specifies behavior of the thread library, implementation is up to development of the library. • Common in UNIX operating systems. Operating System Concepts

  15. Solaris 2 Threads Operating System Concepts

  16. Solaris Process Operating System Concepts

  17. Linux Threads • Linux refers to them as tasks rather than threads. • Thread creation is done through clone() system call. • Clone() allows a child task to share the address space of the parent task (process) Operating System Concepts

  18. Java Threads • Java threads may be created by: • Extending Thread class • Implementing the Runnable interface • Java threads are managed by the JVM. Operating System Concepts

  19. Java Thread States Operating System Concepts

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