public void ReleaseLock()
{
if (ntsm == null)
{
throw new Exception("CriticalSection.ReleaseLock() failed: Network stream has already been closed due to previous exceptions.");
}
if (!hasLock)
{
throw new Exception("CriticalSection.ReleaseLock() failed: The current critical section does not own the lock.");
}
try
{
ntsm.WriteByte((byte)'+'); //release lock
if (ntsm.ReadByte() == (int)'+')
{
hasLock = false;
}
else
{
throw new Exception("CriticalSection.ReleaseLock() handshake failed.");
}
}
catch
{
if (object.ReferenceEquals(this, currentSection))
{
currentSection = null;
}
ntsm.Close();
ntsm = null;
sock.Close();
sock = null;
throw;
}
}
public static CriticalSection Create(string lockname)
{
if (null == lockname)
{
if (currentSection != null)
{
return(currentSection);
}
}
else
{
if (0 == lockname.Length)
{
throw new Exception("Empty lock name is invalid");
}
}
System.Net.Sockets.Socket sock = new System.Net.Sockets.Socket(System.Net.Sockets.AddressFamily.InterNetwork,
System.Net.Sockets.SocketType.Stream, System.Net.Sockets.ProtocolType.Tcp);
System.Net.Sockets.NetworkStream ntsm = null;
try
{
////sock.Connect(Surrogate.MasterHost, 55900);
sock.Connect(DO5_Surrogate_LocateMasterHost(".."), 55900);
ntsm = new XNetworkStream(sock);
ntsm.WriteByte((byte)'J'); //hand shake with surrogate
if (ntsm.ReadByte() == (byte)'+')
{
CriticalSection sec = new CriticalSection();
sec.sock = sock;
sec.ntsm = ntsm;
sec.hasLock = false;
if (null == lockname)
{
currentSection = sec;
}
else
{
sec.locknamebytes = Encoding.UTF8.GetBytes(lockname);
}
return(sec);
}
else
{
throw new Exception("CriticalSection.Create() handshake failed.");
}
}
catch
{
if (ntsm != null)
{
ntsm.Close();
ntsm = null;
}
sock.Close();
sock = null;
throw;
}
}
public static CriticalSection Create(string lockname)
{
if (null == lockname)
{
if (currentSection != null)
{
return currentSection;
}
}
else
{
if (0 == lockname.Length)
{
throw new Exception("Empty lock name is invalid");
}
}
System.Net.Sockets.Socket sock = new System.Net.Sockets.Socket(System.Net.Sockets.AddressFamily.InterNetwork,
System.Net.Sockets.SocketType.Stream, System.Net.Sockets.ProtocolType.Tcp);
System.Net.Sockets.NetworkStream ntsm = null;
try
{
////sock.Connect(Surrogate.MasterHost, 55900);
sock.Connect(DO5_Surrogate_LocateMasterHost(".."), 55900);
ntsm = new XNetworkStream(sock);
ntsm.WriteByte((byte)'J'); //hand shake with surrogate
if (ntsm.ReadByte() == (byte)'+')
{
CriticalSection sec = new CriticalSection();
sec.sock = sock;
sec.ntsm = ntsm;
sec.hasLock = false;
if (null == lockname)
{
currentSection = sec;
}
else
{
sec.locknamebytes = Encoding.UTF8.GetBytes(lockname);
}
return sec;
}
else
{
throw new Exception("CriticalSection.Create() handshake failed.");
}
}
catch
{
if (ntsm != null)
{
ntsm.Close();
ntsm = null;
}
sock.Close();
sock = null;
throw;
}
}
public void Dispose()
{
if (cs != null)
{
cs.ReleaseLock();
cs = null;
}
}
public static IDisposable GetLock_internal(string x)
{
CriticalSection _cs = CriticalSection.Create(x);
_cs.EnterLock();
GlobalCriticalSection gs = new GlobalCriticalSection();
gs.cs = _cs;
return(gs);
}
public bool EnterLock()
{
if (ntsm == null)
{
throw new Exception("CriticalSection.EnterLock() failed: Network stream has already been closed due to previous exceptions.");
}
try
{
// acquire lock
for (int iacq = 0; ;)
{
try
{
if (null == locknamebytes)
{
ntsm.WriteByte((byte)'Q');
}
else
{
ntsm.WriteByte(128 + (byte)'Q'); // 128+Q
XContent.SendXContent(ntsm, locknamebytes);
}
}
catch
{
if (++iacq > 60 / 5)
{
throw;
}
System.Threading.Thread.Sleep(1000 * 5);
_reopen();
continue;
}
break;
}
if (hasLock)
{
throw new Exception("CriticalSection.EnterLock() failed: cannot enter lock twice");
}
if (ntsm.ReadByte() == (int)'+')
{
hasLock = true;
return(true);
}
else
{
throw new Exception("CriticalSection.EnterLock() handshake failed.");
}
}
catch
{
if (object.ReferenceEquals(this, currentSection))
{
currentSection = null;
}
ntsm.Close();
ntsm = null;
sock.Close();
sock = null;
throw;
}
}
public void Dispose()
{
if (cs != null)
{
cs.ReleaseLock();
cs = null;
}
}
public bool EnterLock()
{
if (ntsm == null)
{
throw new Exception("CriticalSection.EnterLock() failed: Network stream has already been closed due to previous exceptions.");
}
try
{
// acquire lock
for (int iacq = 0; ; )
{
try
{
if (null == locknamebytes)
{
ntsm.WriteByte((byte)'Q');
}
else
{
ntsm.WriteByte(128 + (byte)'Q'); // 128+Q
XContent.SendXContent(ntsm, locknamebytes);
}
}
catch
{
if (++iacq > 60 / 5)
{
throw;
}
System.Threading.Thread.Sleep(1000 * 5);
_reopen();
continue;
}
break;
}
if (hasLock)
{
throw new Exception("CriticalSection.EnterLock() failed: cannot enter lock twice");
}
if (ntsm.ReadByte() == (int)'+')
{
hasLock = true;
return true;
}
else
{
throw new Exception("CriticalSection.EnterLock() handshake failed.");
}
}
catch
{
if (object.ReferenceEquals(this, currentSection))
{
currentSection = null;
}
ntsm.Close();
ntsm = null;
sock.Close();
sock = null;
throw;
}
}
public void ReleaseLock()
{
if (ntsm == null)
{
throw new Exception("CriticalSection.ReleaseLock() failed: Network stream has already been closed due to previous exceptions.");
}
if (!hasLock)
{
throw new Exception("CriticalSection.ReleaseLock() failed: The current critical section does not own the lock.");
}
try
{
ntsm.WriteByte((byte)'+'); //release lock
if (ntsm.ReadByte() == (int)'+')
{
hasLock = false;
}
else
{
throw new Exception("CriticalSection.ReleaseLock() handshake failed.");
}
}
catch
{
if (object.ReferenceEquals(this, currentSection))
{
currentSection = null;
}
ntsm.Close();
ntsm = null;
sock.Close();
sock = null;
throw;
}
}
