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FULLOCK (Fast User Level LOCK library) is a low-level lock library that provides secure, fast locking from multi-process, multi-threading.

Reasons why FULLOCK is necessary

We can use fcntl, flock, Posix mutex/rwlock/cond etc for file lock/mutex/reader-writer lock/condition variable as standard.
It is also possible to use these with our products such as K2HASH and CHMPX etc.
However, in the following points these are inadequate for us and we have created our own library.

And, we need to realize a recursive lock by the same thread(When we do a recursive lock, we will not deadlock if it is the same thread), thus we make a library supporting this recursive locking.

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