too. It's slightly adjusted to use the thread blocking syscalls and a benaphore
style threads spinlock replacement. This solves the following problems:
* The static mutex/rwlock initializers are safe now.
* The rwlock implementation is compatible with the kernel implementation. E.g.
a write lock owner can acquire a read lock, which would dead-lock before.
* We don't use semaphores anymore. With a userland BFS one could quite easily
hit the global semaphore limit before.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29579 a95241bf-73f2-0310-859d-f6bbb57e9c96
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