Walter is right about transitive readonly - here's the alternative

[Sean Kelly]

Regan Heath wrote:
 >
> Does it 'break' the system to allow a thread with a read lock to aquire 
> a write lock (assuming we block until no other thread has a read lock)?

Some read-write locks allow a read lock to be 'upgraded' to a write 
lock, but I never liked the idea.  For one, it complicates the algorithm 
quite a bit.


Sean