i) Software Interrupt mechanism (l)Deadlock
ii) Passing data from one process to another process (2)Signals
iii) A situation wherein two or more competing actions (3)Preemptive multitasking
are waiting for the other to finish, and thus
neither ever does
iv) Allows the computer system to more reliably guarantee each process a regular slice of operating time (4)Pipe
Any integer(non negative) can act as semaphore. Semaphores are used for counting tasks such as creating a critical region that allows a specified number of threads to enter. For example, if we want at most four threads to be able to enter a section, we could protect it with a semaphore and initialize that semaphore to four.The first four threads will be able to decrement the semaphore and enter the region, but at that point, the semaphore will be zero and any other thread will be blocked from outside the critical region until one of the current threads leaves and signals the semaphore.
Solv. In. Corr.
0 M:0 S
10 / 41
Choose the correct option.
Critical section is?
Astatements which are not accessing shared resourses
A critical section is a code segment that access shared variables and has to be executed as an atomic action.
It means that in a group of cooperating processes, at a given point of time, only one process must be executing its critical section, If any other process also wants to execute its critical section, it must wait until the first one finishes.
NOTE: Only those processes can enter the critical section which are using the shared variables, and not those which are independent.
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