Why can I not writeLock after ReadLock?

[Esben Mose Hansen]

On Saturday 13 November 2010 13:57:40 Milian Wolff wrote:
> This function will block the current thread if 
> another thread has locked for reading or writing.

If functionA and functionB run simulatanously and both contained this pattern 
(upgrading a read lock to a write lock), the program would deadlock, with 
neither function able to obtain the read lock. 

In fact, at the point they want to write, they are in an impossible situation: 
Both want to be able to modify the chain without anyone else touching it. If 
neither function can back down, the situation is inresolvable.

-- 
Kind regards, Esben
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