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University Of Palestine

University Of Palestine. College of Applied Engineering & Urban Planning Software Engineering Department. Computer Architecture. Computer Architecture. Presents. Multithreading. Multithreading. 2 st Term2009/2010. Multithreading.

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University Of Palestine

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  1. University Of Palestine College of Applied Engineering & Urban PlanningSoftware Engineering Department

  2. Computer Architecture Computer Architecture

  3. Presents

  4. Multithreading Multithreading 2st Term2009/2010

  5. Multithreading • Multithreading refers to the ability of an OS to support multiple, concurrent paths of execution within a single process. • The traditional approach of a single thread of execution per process, in which the concept of a thread is not recognized, is referred to as a single-threaded approach.

  6. Multithreading • MS-DOS supports a single thread • UNIX supports multiple user processes but only supports one thread per process • Windows, Solaris, Linux, Mach, and OS/2 support multiple threads

  7. Multithreading • In a multithreaded environment, a process is defined as the unit of resource allocation and a unit of protection.The following are associated with processes: • A virtual address space that holds the process image • Protected access to processors, other processes (for interprocess communication),files, and I/O resources (devices and channels) • Within a process, there may be one or more threads, each with the following: • A thread execution state (Running, Ready, etc.).

  8. Multithreading • The following are associated with processes: • A saved thread context when not running; one way to view a thread is as an independent program counter operating within a process. • An execution stack. • Some per-thread static storage for local variables. • Access to the memory and resources of its process, shared with all other threads in that process. 8

  9. Multithreading • The key benefits of threads derive from the performance implications: • Takes less time to create a new thread than a process • Less time to terminate a thread than a process • Less time to switch between two threads within the same process • Since threads within the same process share memory and files, they can communicate with each other without invoking the kernel 9

  10. Threads and Processes One process One thread One process Multiple threads Multiple processes One thread per process Multiple processes Multiple threads per process

  11. 4. References Software Requirements, Second Edition , Karl E.Wiegers. Software Engineering , 8th Edition , lan sommerveill . 11

  12. Thank You ! Done by: Ramy Y. Baraka. Supervisor: Eng : Mohammed Temraz.

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