The presented behaviour of pthread_rwlock_rdlock() is POSIX compliant.
The http://opengroup.org/onlinepubs/007908799/xsh/pthread_rwlock_rdlock.html
says explicitely:
The calling thread acquires the read lock if a writer does not hold the
lock and there are no writers blocked on the lock.
It is unspecified whether the calling thread acquires the lock when a
writer does not hold the lock and there are writers waiting for the lock.
Petr
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