How to set a variable as an event for cudastream wait event?

Accelerated Computing CUDA CUDA Programming and Performance
2

Let’s assume the flag variable is stored in device memory.

You could issue a kernel into a stream that waits until that variable is 2:

__global__ void k(volatile int *d) { while (*d != 2){};}

Then record the event after that kernel:

k<<<1,1, 0 , stream>>>(d);
cudaEventRecord(...);

In another stream, wait for that event.

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