cuda::barrier::init
Defined in header <cuda/barrier>:
template <cuda::thread_scope Scope,
typename CompletionFunction = /* unspecified */>
class barrier {
public:
// ...
__host__ __device__
friend void init(cuda::std::barrier* bar,
cuda::std::ptrdiff_t expected,
CompletionFunction cf = CompletionFunction{});
};
The friend function cuda::barrier::init may be used to initialize an
cuda::barrier that has not been initialized.
When using libcu++ with NVCC, __shared__ cuda::barrier will not have its constructors run because __shared__
variables are not initialized. cuda::barrier::init should be used to properly initialize such a
cuda::barrier.
An NVCC diagnostic warning about the ignored constructor will be emitted:
warning: dynamic initialization is not supported for a function-scope static
__shared__ variable within a __device__/__global__ function
It can be silenced using #pragma nv_diag_suppress static_var_with_dynamic_init.
Example
#include <cuda/barrier>
// Disables `cuda::barrier` initialization warning.
#pragma nv_diag_suppress static_var_with_dynamic_init
__global__ void example_kernel() {
__shared__ cuda::barrier<cuda::thread_scope_block> bar;
init(&bar, 1);
}