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CUDA 13 Fix #486

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CUDA 13 Fix #486

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100395a
fix cuda 13
johnnynunez Sep 2, 2025
9ee412f
fix cuda 13
johnnynunez Sep 2, 2025
510985e
fix cuda 13
johnnynunez Sep 2, 2025
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32 changes: 26 additions & 6 deletions src/cpp/cuda.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -854,17 +854,37 @@ namespace pycuda
};

inline
boost::shared_ptr<context> device::make_context(unsigned int flags)
boost::shared_ptr<context> device::make_context(unsigned int flags)
{
context::prepare_context_switch();

CUcontext ctx;
CUDAPP_CALL_GUARDED_THREADED(cuCtxCreate, (&ctx, flags, m_device));
boost::shared_ptr<context> result(new context(ctx));
context_stack::get().push(result);
return result;
}
#if CUDAPP_CUDA_VERSION >= 13000
// CUDA 13+: avoid cuCtxCreate (now takes CUctxCreateParams*). Use primary context.
unsigned int pc_flags = 0;
int pc_active = 0;

// NOTE: argument order is (dev, &flags, &active)
CUDAPP_CALL_GUARDED(cuDevicePrimaryCtxGetState, (m_device, &pc_flags, &pc_active));

// If the primary context isn’t active yet, set flags if requested
if (!pc_active && flags != 0 && pc_flags != flags)
CUDAPP_CALL_GUARDED(cuDevicePrimaryCtxSetFlags, (m_device, flags));

// Retain + make current
CUDAPP_CALL_GUARDED_THREADED(cuDevicePrimaryCtxRetain, (&ctx, m_device));
CUDAPP_CALL_GUARDED(cuCtxSetCurrent, (ctx));

boost::shared_ptr<context> result(new primary_context(ctx, m_device));
#else
// Older CUDA: original 3-arg cuCtxCreate still works
CUDAPP_CALL_GUARDED_THREADED(cuCtxCreate, (&ctx, flags, m_device));
boost::shared_ptr<context> result(new context(ctx));
#endif

context_stack::get().push(result);
return result;
}

#if CUDAPP_CUDA_VERSION >= 7000
inline boost::shared_ptr<context> device::retain_primary_context()
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