I'm learning a book about Unix.
I find that Unix provides many kinds of lock tools implemented by C library,
such as pthread_mutex_lock,pthread_mutex_timedlock,pthread_rwlock_rdlock,pthread_rwlock_wrlock.
So, I am curious about a truth that many other program languages implement their own lock tools.
Do they finish the lock tools based on Unix C library or Unix system call ?
Could we implement userland lock tools ? Are there some reference books or websites introducing it ?
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JasonZhang
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