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Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlock-free order of invoking the P operations by the processes?
The following program consists of 3 concurrent processes and 3 binary semaphores. The semaphores are initialized as S0=1, S1=0, S2=0. Process P0 Process P1 Process P2 While (true) { Wait (S0); Print ‘0’ Release (S1); Release (S2); } Wait (S1); Release (S0); Wait (S2); Release (S0);   How many times will process P0 print ‘0’? 
Consider the following statements: 1. Robots take permissible actions only. 2. All actions that are obligatory for robots are actually performed by them subject to ties and conflicts among available actions. 3. All permissible actions can be proved by the robot to be permissible and it can be explained in ordinary English. Which of the above statements are correct?
A certain computation generates two arrays a and b such that a[i]=f(i) for 0 ≤ i < n and b[i] = g (a[i] ) for 0 ≤ i < n. Suppose this computation is decomposed into two concurrent processes X and Y such that X computes the array a and Y computes the array b. The processes employ two binary semaphores R and S, both initialized to zero. The array a is shared by the two processes. The structures of the processes are shown below. Process X: private i; for (i=0; i
The question given below consists of a statement, followed by three arguments numbered I, II and III. You have to decide which of the arguments is/are ‘strong’ arguments and which is/are ‘weak’ arguments and accordingly choose your answer from the alternatives given below each question. Statement: The imposition of Governor’s rule in Jammu and Kashmir will not affect operations in the state, according to Army Chief General, even as security forces are looking at higher intensity of operations against terrorists, to force them to ‘hibernate’. These operations will be based on greater level of intelligence from the J&K Police, as compared to what was being generated during the suspension of operations for the holy month of Ramzan. A challenge, however, for the security forces still remains the recruitment of local terrorists. Why? Arguments: I. Meanwhile, data shared by security forces reveal that there are about 210 terrorists currently operating in Kashmir, mainly in the South. Out of this, 65 per cent are locals and the remaining are foreign terrorists.  II. In South Kashmir itself, the maximum number of terrorists belong to the HizbulMujahideen, while some are from the Lashkar-e-Toiba and Jaish-e-Mohammed. III. When a local terrorist is killed during an operation, at his funeral more locals are willing to join terrorism. It is a mob mentality.
Consider the following solution to the producer-consumer synchronization problem. The shared buffer size is ?. Three semaphores empty, full and mutex are defined with respective initial values of 0, ? and 1. Semaphore empty denotes the number of available slots in the buffer, for the consumer to read from. Semaphore denotes the number of available slots in the buffer, for the producer to write to. The placeholder variables, denoted by P, Q, R, and S, in the code below can be assigned either empty or full. The valid semaphore operations are: wait ( ) and signal ( ). Producer: Consumer: do {         wait (P) ;         wait (mutex) ;         //Add item to buffer         signal (mutex) ;         signal (Q) ; } while (1) ; do {          wait (R) ;          wait (mutex) ;          //Consume item from buffer          signal (mutex) ;          signal (S) ; } while (1) ;   Which one of the following assignments to P, Q, R and S will yield the correct solution?
Which law states that when elements are arranged in the order of increasing atomic masses, the atomic mass of the middle element of the triad is approximately the average of the atomic masses of the other two elements?
When the elements are arranged in increasing order of atomic weights, the atomic weight of the middle element is approximately the average of the atomic weights of the other two elements' - this rule is known as-
অ্যালুমিনিয়াম, হিলিয়াম এবং সিলিকনের পারমাণবিক সংখ্যা যথাক্রমে 13, 2 এবং 14 হলে, Al27+He27→Si27+( ) নিউক্লিয়ার বিক্রিয়াতে অনুপস্থিত কণা কোনটি? (Aluminum has atomic number 13, helium has atomic number 2, and silicon has atomic number 14. In the nuclear reaction the missing particle Al27+He27→Si27+( ) is:)
. অ্যালুমিনিয়াম, হিলিয়াম এবং সিলিকনের পারমাণবিক সংখ্যা যথাক্রমে 13, 2 এবং 14 হলে, Al27+He27→Si27+ নিউক্লিয়ার বিক্রিয়াতে অনুপস্থিত কণা কোনটি ? (Aluminum has atomic number 13, helium has atomic number 2, and silicon has atomic number 14. In the nuclear reaction Al27+He27→Si27+ the missing particle is:)