"condition variable operating system" Code Answer's
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condition variable operating system
char buffer[SIZE];
int count = 0, putIndex = 0, getIndex = 0;
struct lock l;
struct condition dataAvailable;
struct condition spaceAvailable;
lock_init(&l);
cond_init(&dataAvailable);
cond_init(&spaceAvailable);
void put(char c) {
lock_acquire(&l);
while (count == SIZE) {
cond_wait(&spaceAvailable, &l);
}
count++;
buffer[putIndex] = c;
putIndex++;
if (putIndex == SIZE) {
putIndex = 0;
}
cond_signal(&dataAvailable, &l);
lock_release(&l);
}
char get() {
char c;
lock_acquire(&l);
while (count == 0) {
cond_wait(&dataAvailable, &l);
}
count--;
c = buffer[getIndex];
getIndex++;
if (getIndex == SIZE) {
getIndex = 0;
}
cond_signal(&spaceAvailable, &l);
lock_release(&l);
return c;
}
Source: web.stanford.edu
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