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//
// ReaderWriterLockTest.cs - NUnit Test Cases for System.Threading.ReaderWriterLock
//
// Author:
// Lluis Sanchez Gual (lluis@ximian.com)
//
// (C) 2004 Novell, Inc (http://www.novell.com)
//
using NUnit.Framework;
using System;
using System.Threading;
namespace MonoTests.System.Threading
{
[TestFixture]
// DISABLED due to random hangs. Do not renable until you can run this
// a few thousand times on an SMP box.
[Category ("NotWorking")]
public class ReaderWriterLockTest
{
ReaderWriterLock rwlock;
class ThreadRunner
{
public ThreadStart SecondaryThread;
public Exception ResultException;
public Thread RunningThread;
public void Run ()
{
try
{
SecondaryThread();
}
catch (Exception ex)
{
ResultException = ex;
}
}
public void Join ()
{
RunningThread.Join (5000);
if (ResultException != null) throw ResultException;
}
}
void RunThread (ThreadStart ts)
{
ThreadRunner tr = StartThread (ts);
tr.Join ();
}
ThreadRunner StartThread (ThreadStart ts)
{
ThreadRunner tr = new ThreadRunner();
tr.SecondaryThread = ts;
Thread t = new Thread (new ThreadStart (tr.Run));
tr.RunningThread = t;
t.Start ();
return tr;
}
[Test]
public void TestIsReaderLockHeld ()
{
rwlock = new ReaderWriterLock ();
Assert.IsTrue (!rwlock.IsReaderLockHeld, "#1");
rwlock.AcquireReaderLock (500);
Assert.IsTrue (rwlock.IsReaderLockHeld, "#1");
RunThread (new ThreadStart (IsReaderLockHeld_2));
rwlock.ReleaseReaderLock ();
}
private void IsReaderLockHeld_2 ()
{
Assert.IsTrue (!rwlock.IsReaderLockHeld);
}
[Test]
public void TestIsWriterLockHeld ()
{
rwlock = new ReaderWriterLock ();
Assert.IsTrue (!rwlock.IsWriterLockHeld, "#1");
rwlock.AcquireWriterLock (500);
Assert.IsTrue (rwlock.IsWriterLockHeld, "#2");
RunThread (new ThreadStart (IsWriterLockHeld_2));
rwlock.ReleaseWriterLock ();
}
private void IsWriterLockHeld_2 ()
{
Assert.IsTrue (!rwlock.IsWriterLockHeld);
}
[Test]
public void TestAcquireLocks ()
{
rwlock = new ReaderWriterLock ();
rwlock.AcquireReaderLock (500);
rwlock.AcquireReaderLock (500);
rwlock.ReleaseReaderLock ();
Assert.IsTrue (rwlock.IsReaderLockHeld, "#1");
RunThread (new ThreadStart (AcquireLock_readerWorks));
Assert.IsTrue (rwlock.IsReaderLockHeld);
RunThread (new ThreadStart (AcquireLock_writerFails));
rwlock.ReleaseReaderLock ();
Assert.IsTrue (!rwlock.IsReaderLockHeld);
RunThread (new ThreadStart (AcquireLock_writerWorks));
rwlock.AcquireWriterLock (200);
RunThread (new ThreadStart (AcquireLock_writerFails));
RunThread (new ThreadStart (AcquireLock_readerFails));
rwlock.ReleaseWriterLock ();
}
void AcquireLock_readerWorks ()
{
rwlock.AcquireReaderLock (200);
rwlock.AcquireReaderLock (200);
rwlock.ReleaseReaderLock ();
Assert.IsTrue (rwlock.IsReaderLockHeld);
rwlock.ReleaseReaderLock ();
Assert.IsTrue (!rwlock.IsReaderLockHeld);
}
void AcquireLock_writerFails ()
{
try
{
rwlock.AcquireWriterLock (200);
rwlock.ReleaseWriterLock ();
throw new Exception ("Should not get writer lock");
}
catch (Exception)
{
}
}
void AcquireLock_writerWorks ()
{
rwlock.AcquireWriterLock (200);
rwlock.ReleaseWriterLock ();
}
void AcquireLock_readerFails ()
{
try
{
rwlock.AcquireReaderLock (200);
rwlock.ReleaseReaderLock ();
throw new Exception ("Should not get reader lock");
}
catch (Exception)
{
}
}
[Test]
public void TestReleaseRestoreReaderLock ()
{
rwlock = new ReaderWriterLock ();
rwlock.AcquireReaderLock (500);
rwlock.AcquireReaderLock (500);
Assert.IsTrue (rwlock.IsReaderLockHeld);
LockCookie co = rwlock.ReleaseLock ();
RunThread (new ThreadStart (AcquireLock_writerWorks));
rwlock.RestoreLock (ref co);
RunThread (new ThreadStart (AcquireLock_writerFails));
rwlock.ReleaseReaderLock ();
Assert.IsTrue (rwlock.IsReaderLockHeld);
rwlock.ReleaseReaderLock ();
Assert.IsTrue (!rwlock.IsReaderLockHeld);
}
[Test]
public void TestReleaseRestoreWriterLock ()
{
rwlock = new ReaderWriterLock ();
rwlock.AcquireWriterLock (500);
rwlock.AcquireWriterLock (500);
Assert.IsTrue (rwlock.IsWriterLockHeld);
LockCookie co = rwlock.ReleaseLock ();
RunThread (new ThreadStart (AcquireLock_readerWorks));
rwlock.RestoreLock (ref co);
RunThread (new ThreadStart (AcquireLock_readerFails));
rwlock.ReleaseWriterLock ();
Assert.IsTrue (rwlock.IsWriterLockHeld);
rwlock.ReleaseWriterLock ();
Assert.IsTrue (!rwlock.IsWriterLockHeld);
}
[Test]
public void TestUpgradeDowngradeLock ()
{
rwlock = new ReaderWriterLock ();
rwlock.AcquireReaderLock (200);
rwlock.AcquireReaderLock (200);
LockCookie co = rwlock.UpgradeToWriterLock (200);
Assert.IsTrue (!rwlock.IsReaderLockHeld);
Assert.IsTrue (rwlock.IsWriterLockHeld);
RunThread (new ThreadStart (AcquireLock_writerFails));
rwlock.DowngradeFromWriterLock (ref co);
Assert.IsTrue (rwlock.IsReaderLockHeld);
Assert.IsTrue (!rwlock.IsWriterLockHeld);
RunThread (new ThreadStart (AcquireLock_readerWorks));
rwlock.ReleaseReaderLock ();
Assert.IsTrue (rwlock.IsReaderLockHeld);
rwlock.ReleaseReaderLock ();
Assert.IsTrue (!rwlock.IsReaderLockHeld);
}
[Test]
public void TestReaderInsideWriter ()
{
// Reader acquires and releases work like the writer equivalent
rwlock = new ReaderWriterLock ();
rwlock.AcquireWriterLock (-1);
rwlock.AcquireReaderLock (-1);
Assert.IsTrue (!rwlock.IsReaderLockHeld);
Assert.IsTrue (rwlock.IsWriterLockHeld);
rwlock.AcquireReaderLock (-1);
Assert.IsTrue (!rwlock.IsReaderLockHeld);
Assert.IsTrue (rwlock.IsWriterLockHeld);
rwlock.ReleaseWriterLock ();
Assert.IsTrue (!rwlock.IsReaderLockHeld);
Assert.IsTrue (rwlock.IsWriterLockHeld);
rwlock.ReleaseReaderLock ();
Assert.IsTrue (!rwlock.IsReaderLockHeld);
Assert.IsTrue (rwlock.IsWriterLockHeld);
rwlock.ReleaseReaderLock ();
Assert.IsTrue (!rwlock.IsReaderLockHeld);
Assert.IsTrue (!rwlock.IsWriterLockHeld);
}
[Test]
public void TestReaderMustWaitWriter ()
{
// A thread cannot get the reader lock if there are other threads
// waiting for the writer lock.
rwlock = new ReaderWriterLock ();
rwlock.AcquireWriterLock (200);
ThreadRunner tr = StartThread (new ThreadStart (ReaderMustWaitWriter_2));
Thread.Sleep (200);
RunThread (new ThreadStart (AcquireLock_readerFails));
rwlock.ReleaseReaderLock ();
tr.Join ();
}
void ReaderMustWaitWriter_2 ()
{
rwlock.AcquireWriterLock (2000);
rwlock.ReleaseWriterLock ();
}
[Test]
public void TestBug_55911 ()
{
rwlock = new ReaderWriterLock ();
rwlock.AcquireReaderLock (Timeout.Infinite);
try {
LockCookie lc = rwlock.UpgradeToWriterLock (Timeout.Infinite);
}
finally { rwlock.ReleaseReaderLock(); }
rwlock.AcquireReaderLock (Timeout.Infinite);
try {
LockCookie lc = rwlock.UpgradeToWriterLock (Timeout.Infinite);
}
finally { rwlock.ReleaseReaderLock(); }
}
[Test]
public void TestBug_55909 ()
{
rwlock = new ReaderWriterLock ();
ThreadRunner tr = StartThread (new ThreadStart(Bug_55909_Thread2));
Thread.Sleep (200);
rwlock.AcquireReaderLock (Timeout.Infinite);
try {
LockCookie lc = rwlock.UpgradeToWriterLock (Timeout.Infinite);
Thread.Sleep (500);
}
finally { rwlock.ReleaseReaderLock(); }
tr.Join ();
}
public void Bug_55909_Thread2 ()
{
rwlock.AcquireReaderLock(Timeout.Infinite);
try {
Thread.Sleep (1000);
LockCookie lc = rwlock.UpgradeToWriterLock (Timeout.Infinite);
Thread.Sleep (500);
}
finally { rwlock.ReleaseReaderLock(); }
}
[Test]
public void TestBug_55909_bis ()
{
rwlock = new ReaderWriterLock ();
ThreadRunner tr1 = StartThread (new ThreadStart(Bug_55909_bis_ReaderWriter));
Thread.Sleep(100);
ThreadRunner tr2 = StartThread (new ThreadStart(Bug_55909_bis_Reader));
Thread.Sleep(100);
ThreadRunner tr3 = StartThread (new ThreadStart(Bug_55909_bis_Writer));
Thread.Sleep(100);
ThreadRunner tr4 = StartThread (new ThreadStart(Bug_55909_bis_Reader));
tr1.Join ();
tr2.Join ();
tr3.Join ();
tr4.Join ();
}
void Bug_55909_bis_Reader ()
{
rwlock.AcquireReaderLock(-1);
Thread.Sleep(2000);
rwlock.ReleaseReaderLock();
}
void Bug_55909_bis_ReaderWriter ()
{
rwlock.AcquireReaderLock(-1);
LockCookie lc = rwlock.UpgradeToWriterLock(-1);
Thread.Sleep(1000);
rwlock.DowngradeFromWriterLock(ref lc);
rwlock.ReleaseReaderLock();
}
void Bug_55909_bis_Writer ()
{
rwlock.AcquireWriterLock(-1);
rwlock.ReleaseWriterLock();
}
}
}
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