Reference no: EM133220383

Question 1.

A parent process fork()s a child process to compute a boolean result. The child process computes the result, and wants to send one of two values (either 0 or 1) back to the parent. Can this be done with signals? If so, how? If not, why not?

Question 2.

A paret process fork()s a child process to compute a complicated result. The child process computes the result, and wants to send an object (e.g. C struct instance or C++ class instance) back to the parent. Can this be done with signals? If so, how? If not, why not?

Question 3.

Why is it important to have a SIGCHLD handler for most parent processes that fork()s child processes?

What should the SIGCHLD handler do?

Question 4.

Why is the following:

while ( !object.isReady() )

pthread_cond_wait(&cond,&mutexLock);

a better idea than just:

if ( !object.isReady() )

pthread_cond_wait(&cond,&mutexLock);

Question 5.

Thread routines look like void* threadRoutine (void* vPtr). Why do they take type void*?

Why do they return type void*?

Question 6.

Why do pthread_cond_t conditions exist?

They are not mutual exclusion, that is done by pthread_mutex_t locks. So,what problem do they solve?