namespace kcenon::thread {

/**
 * @class concurrent_queue
 * @brief Thread-safe MPMC queue with blocking wait support
 *
 * This class implements a thread-safe Multi-Producer Multi-Consumer (MPMC) queue
 * using fine-grained locking for simplicity and correctness.
 * ...
 */
template <typename T>
class concurrent_queue {
    // Uses mutex for synchronization
    mutable std::mutex head_mutex_;
    mutable std::mutex tail_mutex_;
    mutable std::mutex cv_mutex_;
    std::condition_variable cv_;
};

// Misleading alias
template <typename T>
using lockfree_queue [[deprecated("Use concurrent_queue instead. "
    "This class uses fine-grained locking, not lock-free algorithms.")]] = concurrent_queue<T>;

}  // namespace kcenon::thread

// Already done - verify deprecation message is clear
template <typename T>
using lockfree_queue [[deprecated(
    "MISLEADING NAME: This class uses fine-grained locking, not lock-free algorithms. "
    "Use concurrent_queue instead. "
    "For true lock-free queue, see lockfree_job_queue with hazard pointers."
)]] = concurrent_queue<T>;

// Before
#include <kcenon/thread/lockfree/lockfree_queue.h>
kcenon::thread::lockfree_queue<int> queue;  // Deprecated warning

// After
#include <kcenon/thread/concurrent/concurrent_queue.h>
kcenon::thread::concurrent_queue<int> queue;  // Correct