#include <stdio.h>

struct event_pair
{
  cudaEvent_t start;
  cudaEvent_t end;
};


inline void check_cuda_error(char *message)
{
  cudaThreadSynchronize();
  cudaError_t error = cudaGetLastError();
  if(error != cudaSuccess)
  {
    printf("CUDA error after %s: %s\n", message, cudaGetErrorString(error));
  }
}


inline void start_timer(event_pair * p)
{
  cudaEventCreate(&p->start);
  cudaEventCreate(&p->end);
  cudaEventRecord(p->start, 0);
}


inline void stop_timer(event_pair * p, char * kernel_name)
{
  cudaEventRecord(p->end, 0);
  cudaEventSynchronize(p->end);
  
  float elapsed_time;
  cudaEventElapsedTime(&elapsed_time, p->start, p->end);
  printf("%s took %.1f ms\n",kernel_name, elapsed_time);
  cudaEventDestroy(p->start);
  cudaEventDestroy(p->end);
}