static void* RWRunner(void* arg)
{
struct timeval tv;
int op, op2, interval;
RWLock* rwlock;
gettimeofday(&tv, NULL);
rwlock = new RWLock(reinterpret_cast<int64_t>(arg));
while (!threadStop)
{
op = rand_r(reinterpret_cast<uint32_t*>(&tv.tv_usec)) % 10;
if (op < 8) // read
{
interval = rand_r(reinterpret_cast<uint32_t*>(&tv.tv_usec)) % 100000;
rwlock->read_lock();
rwlock->lock();
CPPUNIT_ASSERT(rwlock->getReading() > 0);
CPPUNIT_ASSERT(rwlock->getWriting() == 0);
rwlock->unlock();
usleep(interval);
op2 = rand_r(reinterpret_cast<uint32_t*>(&tv.tv_usec)) % 2;
if (op2)
{
rwlock->upgrade_to_write();
rwlock->lock();
CPPUNIT_ASSERT(rwlock->getReading() == 0);
CPPUNIT_ASSERT(rwlock->getWriting() == 1);
rwlock->unlock();
usleep(interval);
rwlock->write_unlock();
}
else
{
/* For testing the lock recovery code in the BRM workernodes */
/*
int crash = rand_r((uint32_t *) &tv.tv_usec) % 100;
if (crash > 0) // 1% chance of crashing
rwlock->read_unlock();
*/
}
}
else if (op < 9) // write
{
interval = rand_r(reinterpret_cast<uint32_t*>(&tv.tv_usec)) % 100000;
rwlock->write_lock();
rwlock->lock();
CPPUNIT_ASSERT(rwlock->getReading() == 0);
CPPUNIT_ASSERT(rwlock->getWriting() == 1);
rwlock->unlock();
usleep(interval);
op2 = rand_r(reinterpret_cast<uint32_t*>(&tv.tv_usec)) % 2;
if (op2)
{
rwlock->downgrade_to_read();
rwlock->lock();
CPPUNIT_ASSERT(rwlock->getReading() > 0);
CPPUNIT_ASSERT(rwlock->getWriting() == 0);
rwlock->unlock();
usleep(interval);
rwlock->read_unlock();
}
else
rwlock->write_unlock();
}
else if (op == 9) // delete
{
delete rwlock;
rwlock = new RWLock(reinterpret_cast<int64_t>(arg));
}
}
delete rwlock;
pthread_exit(0);
}
