Class Semaphore

atomicops.h:409–451

	{
#if defined(_WIN32)
		class Semaphore
		{
		private:
		    void* m_hSema;
		    
		    Semaphore(const Semaphore& other);
		    Semaphore& operator=(const Semaphore& other);

		public:
		    AE_NO_TSAN Semaphore(int initialCount = 0) : m_hSema()
		    {
		        assert(initialCount >= 0);
		        const long maxLong = 0x7fffffff;
		        m_hSema = CreateSemaphoreW(nullptr, initialCount, maxLong, nullptr);
		        assert(m_hSema);
		    }

		    AE_NO_TSAN ~Semaphore()
		    {
		        CloseHandle(m_hSema);
		    }

		    bool wait() AE_NO_TSAN
		    {
		    	const unsigned long infinite = 0xffffffff;
		        return WaitForSingleObject(m_hSema, infinite) == 0;
		    }

			bool try_wait() AE_NO_TSAN
			{
				return WaitForSingleObject(m_hSema, 0) == 0;
			}

			bool timed_wait(std::uint64_t usecs) AE_NO_TSAN
			{
				return WaitForSingleObject(m_hSema, (unsigned long)(usecs / 1000)) == 0;
			}

		    void signal(int count = 1) AE_NO_TSAN
		    {
		        while (!ReleaseSemaphore(m_hSema, count, nullptr));
		    }
		};
#elif defined(__MACH__)
		//---------------------------------------------------------
		// Semaphore (Apple iOS and OSX)