What are counting semaphores?
- 4 Answers
- 13413 Views
- HP, IBM, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Counting semaphore -Locks a shared resource against
simultaneous access by multiple threads
A counting semaphore is a generalization of a mutex
semaphore that locks a shared resource against simultaneous
access by multiple threads. All resource allocation
functions, such as wait() and post() , take an optional
parameter defining the number of resources to allocate or
deallocate.
| Is This Answer Correct ? | 11 Yes | 5 No |
Answer / kiruthiga
Semaphore is a nonnegative integer count. Semaphores are
typically used to coordinate access to resources, with the
semaphore count initialized to the number of free
resources. Threads then atomically increment the count when
resources are added and atomically decrement the count when
resources are removed.
When the semaphore count becomes zero, no more resources
are present. Threads that try to decrement the semaphore
when the count is zero block until the count becomes
greater than zero.
| Is This Answer Correct ? | 7 Yes | 4 No |
Answer / arshiya
Counting semaphores are a synchronization primitive that
allow threads to wait until an event has occurred. The event
may be generated by a producer thread, or by a DSR in
response to a hardware interrupt.
| Is This Answer Correct ? | 8 Yes | 8 No |
Answer / nagi
Binary semaphore or mutex is used for single resouce
locking.where as counting semaphone is a variable counter
whose value will be initilised to number of resources
present.one can acees the resource if semaphore value is
greater than zero.
| Is This Answer Correct ? | 0 Yes | 0 No |
How can two processes communicate with one another?
Explain booting the system in operating system.
What are the different types of kernel?
What are turnaround time and response time?
6 Answers IBM, Maveric, TCS, WUB,
Can you have 2 operating systems on one computer?
What are the ways in which fault tolerance can be ensured in systems? (Different redundancy techniques)?
Explain how a copying garbage collector works. How can it be implemented using semispaces?
What is multi-tasking, multi-programming,multi-threading?
How is the process address space handled during process migration?
What is a safe state and a safe sequence?
Explain briefly about compiler and its functioning?
Define scheduling in OS.
Windows 
