Lecture 6: Kernel Structures and Threading
... (a) Execution state. (b) Execution context (PC, stack, per-thread storage for local variable, access to resources). ...
... (a) Execution state. (b) Execution context (PC, stack, per-thread storage for local variable, access to resources). ...
Threads, SMP, and Micro
... Processes and Threads • Resource ownership - process includes a virtual address space to hold the process image • Scheduling/execution- follows an execution path that may be interleaved with other processes ...
... Processes and Threads • Resource ownership - process includes a virtual address space to hold the process image • Scheduling/execution- follows an execution path that may be interleaved with other processes ...
Chapter 4 - people.vcu.edu
... • Operating system supports multiple threads of execution within a single process • MS-DOS supports a single thread • UNIX supports multiple user processes but only supports one thread per process • Windows 2000, Solaris, Linux, Mach, and OS/2 support multiple threads ...
... • Operating system supports multiple threads of execution within a single process • MS-DOS supports a single thread • UNIX supports multiple user processes but only supports one thread per process • Windows 2000, Solaris, Linux, Mach, and OS/2 support multiple threads ...
Threads, SMP, and Microkernels
... virtual address space to hold the process image and access to I/O • Scheduling/execution- follows an execution path that may be interleaved with other processes • These two characteristics are treated independently by the operating system ...
... virtual address space to hold the process image and access to I/O • Scheduling/execution- follows an execution path that may be interleaved with other processes • These two characteristics are treated independently by the operating system ...
Figure 5.01
... Processes may only share resources through techniques (e.g. shared memory or message passing) …Such techniques must be explicitly arranged by the programmer. ...
... Processes may only share resources through techniques (e.g. shared memory or message passing) …Such techniques must be explicitly arranged by the programmer. ...
Threads, SMP, and Microkernels
... • Operating system supports multiple threads of execution within a single process • 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 ...
... • Operating system supports multiple threads of execution within a single process • 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 ...
Threads, SMP, and Microkernels
... Operating system supports multiple threads of execution within a single process 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 ...
... Operating system supports multiple threads of execution within a single process 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 ...
Threads, SMP, and Microkernels
... • Operating system supports multiple threads of execution within a single process • 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 ...
... • Operating system supports multiple threads of execution within a single process • 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 ...
Document
... referred to as a thread or lightweight process, while the unit of resource ownership is usually still referred to as a process or task. ...
... referred to as a thread or lightweight process, while the unit of resource ownership is usually still referred to as a process or task. ...
Threads in Java
... Process A has what is necessary to execute OS interrupts process B, saving its state OS schedules process A ...
... Process A has what is necessary to execute OS interrupts process B, saving its state OS schedules process A ...
Solaris Symmetric Multiprocessing
... its success as a multiprocessor operating system: •The ability to run operating system code on any available processor and on multiple processors at the same time •Multiple threads of execution within a single process, each of which can execute simultaneously on different processors •Fine-grained sy ...
... its success as a multiprocessor operating system: •The ability to run operating system code on any available processor and on multiple processors at the same time •Multiple threads of execution within a single process, each of which can execute simultaneously on different processors •Fine-grained sy ...
Homework 1
... has only 2 jobs: A and B. Provide a scenario where running the jobs sequentially will provide better performance (measured by having a smaller makespan) compared to running them in parallel. If such a scenario does not exist, explain why. Otherwise, explain the particulars of jobs A and B and how it ...
... has only 2 jobs: A and B. Provide a scenario where running the jobs sequentially will provide better performance (measured by having a smaller makespan) compared to running them in parallel. If such a scenario does not exist, explain why. Otherwise, explain the particulars of jobs A and B and how it ...
ppt
... – very different from POSIX, tough to port – commercial POSIX libraries for Win32 – OS/2 has POSIX option ...
... – very different from POSIX, tough to port – commercial POSIX libraries for Win32 – OS/2 has POSIX option ...
ppt
... – very different from POSIX, tough to port – commercial POSIX libraries for Win32 – OS/2 has POSIX option ...
... – very different from POSIX, tough to port – commercial POSIX libraries for Win32 – OS/2 has POSIX option ...
Chapter 2 Operating System Overview
... available processor • Multiple threads of execution within a single process may execute on different processors simultaneously ...
... available processor • Multiple threads of execution within a single process may execute on different processors simultaneously ...
Answers
... 3. Find a creative/funny analogy to distinguish between a process and a program. Program: a recipe Process: everything needed to cook (e.g., kitchen) Two chefs can cook the same recipe in different kitchens One complex recipe can involve several chefs 4. Give an example where a uniprogramming enviro ...
... 3. Find a creative/funny analogy to distinguish between a process and a program. Program: a recipe Process: everything needed to cook (e.g., kitchen) Two chefs can cook the same recipe in different kitchens One complex recipe can involve several chefs 4. Give an example where a uniprogramming enviro ...
Answers
... 3. Find a creative/funny analogy to distinguish between a process and a program. Program: a recipe Process: everything needed to cook (e.g., kitchen) Two chefs can cook the same recipe in different kitchens One complex recipe can involve several chefs 4. Give an example where a uniprogramming enviro ...
... 3. Find a creative/funny analogy to distinguish between a process and a program. Program: a recipe Process: everything needed to cook (e.g., kitchen) Two chefs can cook the same recipe in different kitchens One complex recipe can involve several chefs 4. Give an example where a uniprogramming enviro ...
Ch_04
... Answer: Context switching between user threads is quite similar to switching between kernel threads, although it is dependent on the threads library and how it maps user threads to kernel threads. In general, context switching between user threads involves taking a user thread of its LWP and replaci ...
... Answer: Context switching between user threads is quite similar to switching between kernel threads, although it is dependent on the threads library and how it maps user threads to kernel threads. In general, context switching between user threads involves taking a user thread of its LWP and replaci ...
Thread (computing)
In computer science, a thread of execution is the smallest sequence of programmed instructions that can be managed independently by a scheduler, which is typically a part of the operating system. The implementation of threads and processes differs between operating systems, but in most cases a thread is a component of a process. Multiple threads can exist within the same process, executing concurrently (one starting before others finish) and share resources such as memory, while different processes do not share these resources. In particular, the threads of a process share its instructions (executable code) and its context (the values of its variables at any given moment).On a single processor, multithreading is generally implemented by time slicing (as in multitasking), and the central processing unit (CPU) switches between different software threads. This context switching generally happens frequently enough that the user perceives the threads or tasks as running at the same time (in parallel). On a multiprocessor or multi-core system, multiple threads can be executed in parallel (at the same instant), with every processor or core executing a separate thread simultaneously; on a processor or core with hardware threads, separate software threads can also be executed concurrently by separate hardware threads.Threads made an early appearance in OS/360 Multiprogramming with a Variable Number of Tasks (MVT) in 1967, in which they were called ""tasks"". Process schedulers of many modern operating systems directly support both time-sliced and multiprocessor threading, and the operating system kernel allows programmers to manipulate threads by exposing required functionality through the system call interface. Some threading implementations are called kernel threads, whereas lightweight processes (LWP) are a specific type of kernel thread that share the same state and information. Furthermore, programs can have user-space threads when threading with timers, signals, or other methods to interrupt their own execution, performing a sort of ad hoc time-slicing.