static
void readerthread(void *junk, unsigned long num) {
(void)junk;
if(num < 80) {
//kprintf_n("Thread %lu trying to acquire read lock\n", num);
random_yielder(4);
rwlock_acquire_read(testrwlock);
random_yielder(4);
kprintf_n("Thread %lu: Reader val:%lu\n", num, testval1);
for(int i=0; i<40000; i++);
random_yielder(4);
rwlock_release_read(testrwlock);
random_yielder(4);
//kprintf_n("Thread %lu released read lock\n", num);
V(donesem);
}
else {
//kprintf_n("Thread %lu trying to acquire write lock\n", num);
random_yielder(4);
rwlock_acquire_write(testrwlock);
random_yielder(4);
testval1++;
kprintf_n("Thread %lu: Writer val:%lu\n", num, testval1);
for(int i=0; i<40000; i++);
random_yielder(4);
rwlock_release_write(testrwlock);
random_yielder(4);
//kprintf_n("Thread %lu released write lock\n", num);
V(donesem);
}
return;
}
static
void
rwlocktestthread_writer(void *junk, unsigned long num)
{
int i;
(void)junk;
for (i=0; i<NLOCKLOOPS; i++) {
rwlock_acquire_write(testrwlock);
testval1 = num;
testval2 = num*num;
testval3 = num%3;
if (testval2 != testval1*testval1) {
fail_writer(num, "testval2/testval1");
}
if (testval2%3 != (testval3*testval3)%3) {
fail_writer(num, "testval2/testval3");
}
if (testval3 != testval1%3) {
fail_writer(num, "testval3/testval1");
}
if (testval1 != num) {
fail_writer(num, "testval1/num");
}
if (testval2 != num*num) {
fail_writer(num, "testval2/num");
}
if (testval3 != num%3) {
fail_writer(num, "testval3/num");
}
rwlock_release_write(testrwlock);
}
V(donesem);
}
static
void
writetestthread(void *junk, unsigned long num)
{
int i;
(void)junk;
int j ;
unsigned long localtestval ;
for (i=0; i<NRWLOOPS; i++) {
rwlock_acquire_write(testrwlock);
kprintf("Lock Acquired for Write Thread %lu \n", num);
testval4++ ;
localtestval = testval4;
//Empty loop to pass time. No other thread should modify the value in this time.
for(j=0 ; j<3000 ;j++) ;
//assert operation to verify whether the value has been changed after this thread has modified it.
KASSERT(localtestval == testval4);
kprintf("Lock Released for Write Thread %lu \n", num);
rwlock_release_write(testrwlock);
}
V(donesem);
}
