Function cuStreamGetCtx_v2

pub unsafe extern "C" fn cuStreamGetCtx_v2(
    hStream: CUstream,
    pCtx: *mut CUcontext,
    pGreenCtx: *mut CUgreenCtx,
) -> CUresult

\brief Query the contexts associated with a stream

Returns the contexts that the stream is associated with.

If the stream is associated with a green context, the API returns the green context in \p pGreenCtx and the primary context of the associated device in \p pCtx.

If the stream is associated with a regular context, the API returns the regular context in \p pCtx and NULL in \p pGreenCtx.

The stream handle \p hStream can refer to any of the following:

• a stream created via any of the CUDA driver APIs such as ::cuStreamCreate, ::cuStreamCreateWithPriority and ::cuGreenCtxStreamCreate, or their runtime API equivalents such as ::cudaStreamCreate, ::cudaStreamCreateWithFlags and ::cudaStreamCreateWithPriority. Passing an invalid handle will result in undefined behavior.
• any of the special streams such as the NULL stream, ::CU_STREAM_LEGACY and ::CU_STREAM_PER_THREAD. The runtime API equivalents of these are also accepted, which are NULL, ::cudaStreamLegacy and ::cudaStreamPerThread respectively. If any of the special handles are specified, the API will operate on the context current to the calling thread. If a green context (that was converted via ::cuCtxFromGreenCtx() before setting it current) is current to the calling thread, the API will return the green context in \p pGreenCtx and the primary context of the associated device in \p pCtx. If a regular context is current, the API returns the regular context in \p pCtx and NULL in \p pGreenCtx. Note that specifying ::CU_STREAM_PER_THREAD or ::cudaStreamPerThread will return ::CUDA_ERROR_INVALID_HANDLE if a green context is current to the calling thread. If no context is current to the calling thread, ::CUDA_ERROR_INVALID_CONTEXT is returned.

\param hStream - Handle to the stream to be queried \param pCtx - Returned regular context associated with the stream \param pGreenCtx - Returned green context if the stream is associated with a green context or NULL if not

\return ::CUDA_SUCCESS, ::CUDA_ERROR_DEINITIALIZED, ::CUDA_ERROR_NOT_INITIALIZED, ::CUDA_ERROR_INVALID_CONTEXT, ::CUDA_ERROR_INVALID_HANDLE \notefnerr

\sa ::cuStreamDestroy, ::cuStreamCreate ::cuStreamCreateWithPriority, ::cuGreenCtxStreamCreate, ::cuStreamGetPriority, ::cuStreamGetFlags, ::cuStreamWaitEvent, ::cuStreamQuery, ::cuStreamSynchronize, ::cuStreamAddCallback, ::cudaStreamCreate, ::cudaStreamCreateWithFlags,