Are you creating user-level or kernel-level threads? How do you know?2. In what ways is this program easier to implement using threads, rather than forking two child processes?3. In what ways is this program more difficult to implement by using threads rather than forking two child processes?4. What could occur if you added the two threads' results without joining with them first?5. Why did you not need to add mutexes or other locking construct to your program, despite it being multithreaded?

f a thread in a program  invokes exec() immediately after  fork() .  So-------Select one:a. duplicates only calling thread  is appropriateb. duplicates all threads in a separate process

What could be an issue with the following program? Assume the child process is executed immediately after forked. int main() { int pid=fork(); if(pid < 0) exit(1); if(pid == 0) { printf("hello world\n"); } else if(pid > 0) { sleep(100000) ; } return 0; } Select one: a. It may create a zombie process. b. It may cause other processes to starve by hogging CPU time executing sleep. c. It may create an orphan process.

In most operating systems, communication between independent processes requires the intervention of the kernel to provide protection and the mechanisms needed for communication. However, because threads within the same process share memory and files, they can communicate with each other without invoking the kernel.Group of answer choicesTrueFalse

Nella gestione dei thread, individua tra le seguenti affermazioni quali possono essere considerate come svantaggi:Scegli una o più alternative:a. non è possibile sfruttare il parallelismo fisico in architetture multiprocessore per thread generati dallo stesso processo dato che sono “interni al processo stesso” e quindi assegnati a uno specifico processoreb. se un thread effettua una system call, per esempio per motivi di I/O, oltre che a sospendere se stesso provoca la sospensione del processo che lo ha generato e quindi anche di tutti gli altri thread sempre generati dallo stesso processoc. Elevate prestazioni nell'implementazione di elaborazioni concorrentid. La condivisione è automaticamente garantita poiché tutti i thread condividono la memoria del processo cui appartengono

On a uniprocessor, multiprogramming enables the interleaving of multiple threads within multiple processes.Group of answer choicesTrueFalse