// Put an item in the queue synchronously enabling timeout and cancellation
public bool Put(T item, int timeout = Timeout.Infinite,
CancellationToken cToken = default(CancellationToken))
{
if (freeSlots.Acquire(timeout: timeout, token: cToken))
{
lock (room)
room[putIdx++ % capacity] = item;
filledSlots.Release();
return(true);
}
else
{
return(false);
}
}
// test semaphore as a mutual exclusion lock using synchronous acquires
private static bool TestSemaphoreAsLockSync()
{
const int SETUP_TIME = 50;
const int RUN_TIME = 30 * 1000;
int THREADS = 50;
const int MIN_TIMEOUT = 1;
const int MAX_TIMEOUT = 50;
const int MIN_CANCEL_INTERVAL = 1;
const int MAX_CANCEL_INTERVAL = 50;
Thread[] tthrs = new Thread[THREADS];
int[] privateCounters = new int[THREADS];
int[] timeouts = new int[THREADS];
int[] cancellations = new int[THREADS];
int issuedInterrupts = 0;
int[] sensedInterrupts = new int[THREADS];
int sharedCounter = 0;
bool exit = false;
ManualResetEventSlim start = new ManualResetEventSlim();
SemaphoreSlim1 _lock = new SemaphoreSlim1(1, 1);
/**
* Create and start acquirer/releaser threads
*/
for (int i = 0; i < THREADS; i++)
{
int tid = i;
tthrs[i] = new Thread(() => {
Random rnd = new Random(Thread.CurrentThread.ManagedThreadId);
start.Wait();
CancellationTokenSource cts =
new CancellationTokenSource(rnd.Next(MIN_CANCEL_INTERVAL, MAX_CANCEL_INTERVAL));
do
{
do
{
try {
if (_lock.Acquire(timeout: rnd.Next(MIN_TIMEOUT, MAX_TIMEOUT), token: cts.Token))
{
break;
}
timeouts[tid]++;
}
catch (OperationCanceledException) {
cancellations[tid]++;
cts.Dispose();
cts = new CancellationTokenSource(rnd.Next(MIN_CANCEL_INTERVAL, MAX_CANCEL_INTERVAL));
}
catch (ThreadInterruptedException) {
sensedInterrupts[tid]++;
}
} while (true);
try {
Thread.Sleep(0);
}
catch (ThreadInterruptedException) {
sensedInterrupts[tid]++;
}
sharedCounter++;
if (THREADS > 1)
{
if (rnd.Next(100) < 99)
{
Thread.Yield();
}
else
{
try {
Thread.Sleep(rnd.Next(MIN_TIMEOUT, MAX_TIMEOUT));
}
catch (ThreadInterruptedException) {
sensedInterrupts[tid]++;
}
}
}
// release the lock
_lock.Release();
privateCounters[tid]++;
if (THREADS > 1)
{
try {
if ((privateCounters[tid] % 100) == 0)
{
Console.Write("[#{0:D2}]", tid);
}
}
catch (ThreadInterruptedException) {
sensedInterrupts[tid]++;
}
}
} while (!Volatile.Read(ref exit));
try {
Thread.Sleep(10);
}
catch (ThreadInterruptedException) {
sensedInterrupts[tid]++;
}
});
tthrs[i].Start();
}
Thread.Sleep(SETUP_TIME);
Stopwatch sw = Stopwatch.StartNew();
start.Set();
Random grnd = new Random(Thread.CurrentThread.ManagedThreadId);
int endTime = Environment.TickCount + RUN_TIME;
//...
do
{
Thread.Sleep(grnd.Next(5));
#if SEND_INTERRUPTS
if (THREADS > 1)
{
tthrs[grnd.Next(THREADS)].Interrupt();
issuedInterrupts++;
}
#endif
if (Console.KeyAvailable)
{
Console.Read();
break;
}
#if RUN_CONTINOUSLY
} while (true);
#else
} while (Environment.TickCount < endTime);