Due: 2/16/2001 - Class Time

Write a C program that produces enough neatly formatted out to demonstrate that it has correctly performed the following:

1. signal(SIGALRM,SIG_IGN);
• ignore the alarm notification
• HP probably doesn't need this
2. initialize the random number generator
3. create a dynamic array named delay of 20 longs
• use malloc(...)
4. create an array of thread_t to hold 20 thread IDs
5. create 20 threads each running the same function - named whatever you want
• pass to the thread a random number % 3,000,000 via delay[i]
• each thread gets the address of a different element of the dynamic array
6. after the 20 threads have been created
7. join each exiting thread reporting for each thread
• the ID of the thread just joined
• the value returned by that thread
8. when all threads have exit-ed
• free the dynamic array

The function that all the threads are executing should

1. printf the fact that it's alive and how long it has been asked to sleep
2. usleep(the argument that it was passed)
3. return the argument that it was passed

Sample Output - Please don't duplicate.  It's being shown to clarify the assignment.  OK?

footnotes:

1. pthread's join doesn't report back the thread ID so users of pthreads will have to improvise
2. ps -fL
• reported that my process began with 4 kernel LWPs and after creating all the threads I had been assigned as many as 20 kernel LWPs (without my requesting)

You will use the 'script' command to capture all necessary information for handin.