Share cameras between threads

Support
4

Here’s how I do it (in this case to make thread-safe calls to fftw, which are not thread-safe):

Declare a static (global) mutex object:

std::mutex myMutex;

In your context that can be called in multiple threads:

void Foo::myThreadSafeMethod( const ..., const ..., const...) const
{
	std::unique_lock<std::mutex> lck (myMutex, std::defer_lock);

        (thread safe code)

	for( ... )
	{

       (thread safe code)
                
		//calls to fftw are not thread safe
		lck.lock();                   //
           index out_fft_size = M / 2 + 1;
           fftw_array_raw out_fft
               = (fftw_complex *)fftw_malloc(sizeof(fftw_complex) * out_fft_size);
           fftw_plan p_fft;
           p_fft = fftw_plan_dft_r2c_1d(M, in, out_fft, FFTW_ESTIMATE_PATIENT);
           fftw_execute(p_fft);
           fftw_destroy_plan(p_fft);
           out.set_data(out_fft, M / 2 + 1);
		lck.unlock();                 //

       (thread safe code)

     }
}

I hope this helps,

Paulo