f76e6c39f6
This simplifies the check for thread ownership by removing the _locked flag and just comparing against the thread ID of the last thread to take the lock. If the running thread took the lock _holding_thread will be equal to pthread_self(); if _holding_thread is some other value then the running thread does not have the lock. Setting a pthread_t to 0 like this is not portable but should work on every platform we are likely to care about for the near future.
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