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void free_mutex(db_mutex_t mtx)
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<p>Free a mutex, and return immediately. </p>
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<p>The mutex handle to free. </p>
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<p>0 if succeed, non-zero otherwise, call db_strerror to get message. </p>
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Group: Mutex API based on Berkeley DB mutex.</h3>
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<p>These functions are in-process mutex support which uses Berkeley DB mutex mechanisms.</p>
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