public void Calling_ReleaseReadLock_without_any_lock_held_should_throw()
{
using (var readWriteLock = new TinyReadWriteLock(Guid.NewGuid().ToString(), 1))
{
Assert.Throws <SemaphoreFullException>(() => readWriteLock.ReleaseReadLock());
}
}
public void Calling_ReleaseReadLock_should_release_lock()
{
using var readWriteLock = new TinyReadWriteLock(Guid.NewGuid().ToString(), 1);
readWriteLock.AcquireReadLock();
Assert.True(readWriteLock.IsReaderLockHeld);
readWriteLock.ReleaseReadLock();
Assert.False(readWriteLock.IsReaderLockHeld);
}
public void Calling_AcquireReadLock_then_AquireWriteLock_should_wait_for_other_lock()
{
var lockId = Guid.NewGuid().ToString();
using (var readWriteLock1 = new TinyReadWriteLock(lockId, 2))
using (var readWriteLock2 = new TinyReadWriteLock(lockId, 2))
{
readWriteLock1.AcquireReadLock();
Task.Factory.StartNew(() => readWriteLock2.AcquireWriteLock());
Thread.Sleep(10);
Assert.True(readWriteLock1.IsReaderLockHeld);
Assert.False(readWriteLock2.IsWriterLockHeld);
readWriteLock1.ReleaseReadLock();
Thread.Sleep(10);
Assert.False(readWriteLock1.IsReaderLockHeld);
Assert.True(readWriteLock2.IsWriterLockHeld);
}
}
public void Calling_AcquireReadLock_then_AquireWriteLock_should_wait_for_other_lock()
{
var lockId = Guid.NewGuid().ToString();
using var readWriteLock1 = new TinyReadWriteLock(lockId, 2);
using var readWriteLock2 = new TinyReadWriteLock(lockId, 2);
readWriteLock1.AcquireReadLock();
var writeLockTask = Task.Run(() => readWriteLock2.AcquireWriteLock());
WaitForTaskToStart(writeLockTask);
Assert.True(readWriteLock1.IsReaderLockHeld);
Assert.False(readWriteLock2.IsWriterLockHeld);
readWriteLock1.ReleaseReadLock();
writeLockTask.Wait();
Assert.False(readWriteLock1.IsReaderLockHeld);
Assert.True(readWriteLock2.IsWriterLockHeld);
}