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https://stackoverflow.com/questions/6329665/implementation-of-semaphores-in-kernel
Using hardware instructions like TestAndSet()? Because, at some point some support from hardware would be needed (either user takes that support or kernel takes that support), because we want an instruction which does testing and setting in one instruction (which can not be interrupted in between).
https://www.quora.com/What-are-all-the-synchronization-mechanisms-which-require-hardware-support-and-what-do-you-lose-with-pure-software-solutions
I will try to explain as much as I can some various software/hardware techniques for achieving synchronization with concurrency using lots of examples, since this is the best way to grasp the idea about it. In the software context, synchronizatio...
https://quizlet.com/280041614/operating-systems-midterm-synthesis-flash-cards/
Define a counting semaphore, signal, and wait. ... Does a system call require hardware support? Yes, to set the CPU's protection to to run in kernel mode. Does process creation require hardware support? Yes, to perform a system call. Does thread creation require hardware support? Kernel threads do, user level threads don't.
https://stackoverflow.com/questions/5300319/what-is-a-hardware-semaphore
How can it be used from software if it is a hardware semaphore? Is it that there is a software API which is actually implemented in HW? I ask as I am implementing firmware to interface to some hardware. There is going to be a lot of information exchange between the hardware and the firmware.
https://people.eecs.berkeley.edu/~kubitron/cs162/exams/fa07mt1-solutions.pdf
CS 162 Fall 2007 Midterm Exam I October 10, 2007 Page 3/18 Problem 1: Short Answer [15pts] Problem 1a[2pts]: Name two ways in which processes on the same processor can communicate with one another. If any of the techniques you name require hardware support, explain.
https://www.quora.com/What-s-the-difference-between-a-binary-and-general-semaphore
Semaphore is a synchronisation primitive that allows up to [math] n [/math] concurrent threads (or processes) to access the critical section (the shared resource) in parallel. It is done by keeping a simple counter, which is initialised to [math] ...
http://www2.latech.edu/~box/os/ch06.pdf
Many systems provide hardware support for critical section code" ... Synchronization tool that does not require busy waiting ! ... Counting semaphore – integer value can range over an unrestricted domain"
https://docs.microsoft.com/en-us/windows-hardware/drivers/kernel/semaphore-objects
Few system-supplied drivers use semaphore objects, and, of those that do, even fewer use a binary semaphore. Although a binary semaphore might seem to be similar in functionality to a mutex object, a binary semaphore does not provide the built-in protection against deadlocks that a mutex object has for system threads running in SMP machines.
https://quizlet.com/126735937/operating-systems-chapter-6-process-synchronization-flash-cards/
Start studying Operating Systems Chapter 6: Process Synchronization. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
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