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Semantics of copying mutex/rwlock
I've seen people state that making a copy of a mutex/rwlock and then
using that copy will give undefined results. Just trying to understand
why that happens.
As far as I know, NetBSD pthreads man pages don't talk about how
locking primitives are implemented and the result of copying them.
I mean, maybe it's conventional wisdom that you shouldn't make a copy
of a mutex, but it seems logical to think that if you have a mutex and
you know no threads are using it, then
memcpy(&new_mutex, &old_mutex, sizeof(pthread_mutex_t))
and having all threads use new mutex should be OK?
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