protected bool Enter(IAccessLock rwlock)
{
CheckDisposed();
switch (rwlock.Type)
{
case AccessLockType.Reader:
if (!rwLockSlim.IsReadLockHeld && !rwLockSlim.IsUpgradeableReadLockHeld && !rwLockSlim.IsWriteLockHeld)
{
rwLockSlim.EnterReadLock();
return(true);
}
break;
case AccessLockType.UpgradeableReader:
if (rwLockSlim.IsReadLockHeld)
{
throw new InvalidOperationException("already holds a read lock!");
}
if (!rwLockSlim.IsUpgradeableReadLockHeld && !rwLockSlim.IsWriteLockHeld)
{
rwLockSlim.EnterUpgradeableReadLock();
return(true);
}
break;
case AccessLockType.Writer:
if (rwLockSlim.IsReadLockHeld)
{
throw new InvalidOperationException("already holds a read lock!");
}
if (!rwLockSlim.IsWriteLockHeld)
{
rwLockSlim.EnterWriteLock();
return(true);
}
break;
default:
throw new NotSupportedException(rwlock.Type.ToString());
}
return(false);
}
protected void Exit(IAccessLock rwlock)
{
if (rwlock.IsLocked)
{
switch (rwlock.Type)
{
case AccessLockType.Reader:
rwLockSlim.ExitReadLock();
break;
case AccessLockType.UpgradeableReader:
rwLockSlim.ExitUpgradeableReadLock();
break;
case AccessLockType.Writer:
rwLockSlim.ExitWriteLock();
break;
}
}
}