ReaderWriterLockSlim question.
- by Kamarey
There are lots written about the ReaderWriterLockSlim class which allows multiple read and a single write. All of these (at least that I had found) tell how to use it without much explanation why and how it works. The standard code sample is:
lock.EnterUpgradeableReadLock();
try
{
if (test if write is required)
{
lock.EnterWriteLock();
try
{
change the resourse here.
}
finally
{
lock.ExitWriteLock();
}
}
}
finally
{
lock.ExitUpgradeableReadLock();
}
The question is: if upgradeable lock permits only a single thread to enter its section, why I should call EnterWriteLock method within? What will happen if I don't? Or what will happen if instead of EnterUpgradeableReadLock I will call EnterWriteLock and will write to a resource without using upgradeable lock at all?
