Block.h

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#ifndef ossimBlock_HEADER
#define ossimBlock_HEADER 1
#include <ossim/base/ossimConstants.h>
#include <mutex>
#include <condition_variable>
#include <atomic>

namespace ossim{

   class OSSIM_DLL Block
   {
   public:
      Block(bool releaseFlag=false);

      ~Block();

      void set(bool releaseFlag);

      void block();

      void block(ossim_uint64 waitTimeMillis);

      void release();

      void reset();

   private:
      mutable std::mutex      m_mutex;

      std::atomic<bool>       m_release;

      std::condition_variable m_conditionVariable;

      std::atomic<ossim_int32> m_waitCount;

      std::condition_variable m_conditionalWait;
   };
}
#endif