public void Run()
{
//create needed mutexes
Mutex programEndsMutex = new Mutex(true, "programEnds");
Semaphore wrt = Semaphore.OpenExisting("writerMutex");
Semaphore currentRecordCount = Semaphore.OpenExisting("currentRecordCount");
//set thread culture info in order to make easier logs
System.Threading.Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
bool programEnds = false;
while (!programEnds)
{
//try and wait for wrt writers mutex
try
{
wrt.WaitOne();
currentRecordCount.Release();//increment current record count
Data myData = new Data();
Random rand = new Random();
Thread.Sleep(rand.Next(0, writersDelay));//do something
short recordNum = (short)rand.Next(1, Program.RECORDCOUNT+1);
while (myData.writeData(recordNum) == false)
{
recordNum = (short)rand.Next(1, Program.RECORDCOUNT+1);
//Console.WriteLine(Thread.CurrentThread.ManagedThreadId.ToString() + ":" + recordNum);
};
//log
Logger.Log(Thread.CurrentThread.ManagedThreadId.ToString(), "Writer finished writing");
//release writers mutex
wrt.Release();
}
catch (Exception e)
{
wrt.Release();
}
//check if program should end
if (programEndsMutex.WaitOne(0))
{
programEndsMutex.ReleaseMutex();
programEnds = true;
}
}
//thread will end, decrease threadCounter semaphore
threadCounter.WaitOne();
}
public void Run()
{
//create needed mutexes
Mutex programEndsMutex = new Mutex(true, "programEnds");
Mutex mutex = new Mutex(false, "readerMutex");
Semaphore wrt = Semaphore.OpenExisting("writerMutex");
Semaphore currentRecordCount = Semaphore.OpenExisting("currentRecordCount");
//set thread culture info in order to make easier logs
System.Threading.Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
bool programEnds = false;
while (!programEnds)
{
//readers critical section start
mutex.WaitOne();
rc++;
if (rc == 1)//if this thread is the only active reader, prevent writers
wrt.WaitOne();
if (!currentRecordCount.WaitOne(0)) //decrement current record count
{
rc--;
if (rc == 0)//if no more active readers, release writers mutex
wrt.Release();
mutex.ReleaseMutex();
}
else
{
mutex.ReleaseMutex();
//readers critical section end
Data myData = new Data();
Random rand = new Random();
Thread.Sleep(rand.Next(0, readersDelay));//do something
//readers critical section start
mutex.WaitOne();
short recordNum = (short)rand.Next(1, Program.RECORDCOUNT + 1);
while (myData.readData(recordNum) == false)
{
recordNum = (short)rand.Next(1, Program.RECORDCOUNT + 1);
//Console.WriteLine(Thread.CurrentThread.ManagedThreadId.ToString() + ":" + recordNum);
};
//log
Logger.Log(Thread.CurrentThread.ManagedThreadId.ToString(), "Reader finished reading");
myData.makeNull(recordNum);
rc--;
if (rc == 0)//if no more active readers, release writers mutex
wrt.Release();
mutex.ReleaseMutex();
//readers critical section end
}
//check if program should end
if (programEndsMutex.WaitOne(0))
{
programEndsMutex.ReleaseMutex();
programEnds = true;
}
}
//thread will end, decrease threadCounter semaphore
threadCounter.WaitOne();
}
