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/usr/include/bobcat/sharedmutex is in libbobcat-dev 3.19.01-1ubuntu1.

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#ifndef INCLUDED_BOBCAT_SHAREDMUTEX_
#define INCLUDED_BOBCAT_SHAREDMUTEX_

#include <pthread.h>

namespace FBB
{

class SharedMutex
{
    pthread_mutex_t d_mutex;

    public:
        SharedMutex();
        SharedMutex(SharedMutex const &other) = delete;

        ~SharedMutex();                 // does unlock

        SharedMutex &operator=(SharedMutex const &rhs) = delete;

        void lock();
        void unlock();
};

inline void SharedMutex::unlock()
{
    pthread_mutex_unlock(&d_mutex);
}

} // FBB        
#endif