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Add note that cv::cuda::Stream class is not thread safe

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This commit is contained in:
Vladislav Vinogradov 2016-07-14 14:20:37 +03:00
parent 3e77731f7e
commit bfd6ae77f5
1 changed files with 20 additions and 1 deletions
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21
modules/core/include/opencv2/core/cuda.hpp
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@ -447,7 +447,26 @@ CV_EXPORTS void unregisterPageLocked(Mat& m);
functions use the constant GPU memory, and next call may update the memory before the previous one
has been finished. But calling different operations asynchronously is safe because each operation
has its own constant buffer. Memory copy/upload/download/set operations to the buffers you hold are
also safe. :
also safe.
@note The Stream class is not thread-safe. Please use different Stream objects for different CPU threads.
@code
void thread1()
{
cv::cuda::Stream stream1;
cv::cuda::func1(..., stream1);
}
void thread2()
{
cv::cuda::Stream stream2;
cv::cuda::func2(..., stream2);
}
@endcode
@note By default all CUDA routines are launched in Stream::Null() object, if the stream is not specified by user.
In multi-threading environment the stream objects must be passed explicitly (see previous note).
*/
class CV_EXPORTS Stream
{