21⟩ Explain the state of the processor, when a process is waiting for some event to occur?
Waiting state
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35 Windows Programing Questions And Answers
22⟩ Explain the cause of thrashing? How does the system detect thrashing? Once it detects thrashing, what can the system do to eliminate this problem?
Thrashing is caused by under allocation of the minimum number of pages required by a process, forcing it to continuously page fault. The system can detect thrashing by evaluating the level of CPU utilization as compared to the level of multiprogramming. It can be eliminated by reducing the level of multiprogramming.
23⟩ Explain What are the difference phases of software development or software life cycle?
Specification of the task
Design of algorithms
Implementation (coding)
Testing and debugging
Maintenance and evolution of the system
Obsolescence
24⟩ Explain What are types of kernel objects?
Several types of kernel objects, such as access token objects, event objects, file objects, file-mapping objects, I/O completion port objects, job objects, mailslot objects, mutex objects, pipe objects, process objects, semaphore objects, thread objects, and waitable timer objects.
25⟩ How to create a Mutex?
A thread uses the CreateMutex function to create a mutex object. The creating thread can request immediate ownership of the mutex object and can also specify a name for the mutex object
26⟩ Explain the limit on per process for creating a thread?
The number of threads a process can create is limited by the available virtual memory and depends on the default stack size
27⟩ Explain How do other threads own the mutex?
Threads in other processes can open a handle to an existing named mutex object by specifying its name in a call to theOpenMutex - function. Any thread with a handle to a mutex object can use one of the wait functions to request ownership of the mutex object. If the mutex object is owned by another thread, the wait function blocks the requesting thread until the owning thread releases the mutex object using theReleaseMutex - function.
28⟩ can User access these kernel objects structures?
Kernel object data structures are accessible only by the kernel.
29⟩ example of microkernel?
► Amoeba
► WinNT
► Minix
30⟩ What is difference between a computer process and thread?
A single process can have multiple threads that share global data and address space with other threads running in the same process, and therefore can operate on the same data set easily. Processes do not share address space and a different mechanism must be used if they are to share data.
If we consider running a word processing program to be a process, then the auto-save and spell check features that occur in the background are different threads of that process which are all operating on the same data set (your document).
process:
In computing, a process is an instance of a computer program that is being sequentially executed[1] by a computer system that has the ability to run several computer programs concurrently.
Thread:
A single process may contain several executable programs (threads) that work together as a coherent whole. One thread might, for example, handle error signals, another might send a message about the error to the user, while a third thread is executing the actual task of the...
31⟩ Explain How owns the Kernel Object?
Kernel objects are owned by the kernel, not by a process
32⟩ Explain LDAP?
LDAP, Lightweight Directory Access Protocol, is an Internet protocol that email and other programs use to look up information from a server.
33⟩ Explain a Real-Time System?
A real time process is a process that must respond to the events within a certain time period. A real time operating system is an operating system that can run real time processes successfully
34⟩ Explain INODE?
INODE is a pointer to a block on the disk and it is unique.
Inode is an unique number. Inode holds metadata of files.
35⟩ Explain CPU Scheduler?
► Selects from among the processes in memory that are ready to execute, and allocates the CPU to one of them.
► CPU scheduling decisions may take place when a process:
1.Switches from running to waiting state.
2.Switches from running to ready state.
3.Switches from waiting to ready.
4.Terminates.
► Scheduling under 1 and 4 is nonpreemptive.
► All other scheduling is preemptive.
