RWLock.h

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#ifndef ossimRWLockHEADER
#define ossimRWLockHEADER 1

#include <condition_variable>
#include <mutex>
#include <atomic>
#include <limits>

namespace ossim {

    class RWLock {
    private:
        std::mutex m_waitMutex;
        std::condition_variable m_waitConditional;
        std::atomic_int m_refCounter;
        const int MIN_INT;

    public:

        RWLock();

        void lockWrite();

        bool tryLockWrite();

        void unlockWrite();

        void lockRead();

        bool tryLockRead();

        void unlockRead();
    };


    class ScopeReadLock {
        RWLock& m_lock;
    public:
        ScopeReadLock(RWLock &lock) : m_lock(lock) {
            m_lock.lockRead();
        }

        ~ScopeReadLock() {
            m_lock.unlockRead();
        }
    };

    class ScopeWriteLock {
        RWLock& m_lock;
    public:
        ScopeWriteLock(RWLock& lock) : m_lock(lock) {
            m_lock.lockWrite();
        }

        ~ScopeWriteLock() {
            m_lock.unlockWrite();
        }
    };
};

#endif