The answer to this is FALSE. I just took the test & got 100%.
Answer:
int sumid=0; /* Shared var that contains the sum of the process ids currently accessing the file */
int waiting=0; /* Number of process waiting on the semaphore OkToAccess */
semaphore mutex=1; /* Our good old Semaphore variable ;) */
semaphore OKToAccess=0; /* The synchronization semaphore */
get_access(int id)
{
sem_wait(mutex);
while(sumid+id > n) {
waiting++;
sem_signal(mutex);
sem_wait(OKToAccess);
sem_wait(mutex);
}
sumid += id;
sem_signal(mutex);
}
release_access(int id)
{
int i;
sem_wait(mutex);
sumid -= id;
for (i=0; i < waiting;++i) {
sem_signal(OKToAccess);
}
waiting = 0;
sem_signal(mutex);
}
main()
{
get_access(id);
do_stuff();
release_access(id);
}
Some points to note about the solution:
release_access wakes up all waiting processes. It is NOT ok to wake up the first waiting process in this problem --- that process may have too large a value of id. Also, more than one process may be eligible to go in (if those processes have small ids) when one process releases access.
woken up processes try to see if they can get in. If not, they go back to sleep.
waiting is set to 0 in release_access after the for loop. That avoids unnecessary signals from subsequent release_accesses. Those signals would not make the solution wrong, just less efficient as processes will be woken up unnecessarily.
Flip 10 and you get 01 then you add 1 to it:
1
01
+ 1
-----
1 1
So, C. 11
Answer:
Explanation:
PowerPoint is a software that allows user to create headers as well as footers which are information usually appears at the top of the slides and the information that appears at the bottom of all slides. Headers and footers are useful when making presentation in these ways:
✓ Both provide quick information about one's document/ data clearly in a predictable format. The information that is provided by the Header and footers typically consist of ;
©name of the presenters,
©the presentation title
©slide number
©date and others.
✓ They help in setting out different parts of the document.
✓Since the Headers and footers can appear on every slide, corporate confidentiality as well as copyright information can be added to footer area to discourages those that can steal ones secrete.
Round up your experience estimates to add a buffer.
