/*
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 */

/* HIT_START
 * BUILD: %t %s ../../test_common.cpp NVCC_OPTIONS --std=c++11
 * TEST: %t
 * HIT_END
 */



// Testcase Description: This test case is used to verify if the callback
// function called through  hipStreamAddCallback() api completes the execution
// in order as hipStreamAddCallback() api queued in their respective streams



#include <stdio.h>
#include <vector>
#include "hip/hip_runtime.h"
#include "test_common.h"


#ifdef __HIP_PLATFORM_AMD__
#define HIPRT_CB
#endif


hipStream_t mystream1, mystream2;
size_t Num = 4096;
std::vector<int> Stream1_Order, Stream2_Order;


__global__ void vector_square(float* C_d, float* A_d, size_t Num) {
  size_t gputhread = (blockIdx.x * blockDim.x + threadIdx.x);
  size_t stride = blockDim.x * gridDim.x;

  for (size_t i = gputhread; i < Num; i += stride) {
      C_d[i] = A_d[i] * A_d[i];
  }

  // Delay thread 1 only in the GPU
  if (gputhread == 1) {
    unsigned long long int wait_t = 3200000000, start = clock64(), cur;
      do {
          cur = clock64() - start;
      } while (cur < wait_t);
    }
}

float *A_h, *C_h, *A_h1, *C_h1;

static void HIPRT_CB Callback_Stream1(hipStream_t stream, hipError_t status,
                                      void* userData) {
  for (size_t i = 0; i < Num; i++) {
      if (C_h[i] != A_h[i] * A_h[i]) {
          std::cout << "Data mismatch in stream1 at: " << i << std::endl;
      }
  }

  // Storing the int passed into this callback into Stream1_Order
  // this will help verify the order in which this Callback function
  // is called.
  Stream1_Order.push_back(*(reinterpret_cast<int*>(userData)));
  delete reinterpret_cast<int*>(userData);
}

static void HIPRT_CB Callback_Stream2(hipStream_t stream, hipError_t status,
                                      void* userData) {
  for (size_t i = 0; i < Num; i++) {
      if (C_h1[i] != A_h1[i] * A_h1[i]) {
          std::cout << "Data mismatch in stream2 at: " << i << std::endl;
      }
  }
  // Storing the int passed into this callback into Stream2_Order
  // this will help verify the order in which this Callback function
  // is called.
  Stream2_Order.push_back(*(reinterpret_cast<int*>(userData)));
  delete reinterpret_cast<int*>(userData);
}

int main(int argc, char* argv[]) {
  float *A_d, *C_d;
  size_t Nbytes = Num * sizeof(float);

  A_h = reinterpret_cast<float*>(malloc(Nbytes));
  HIPCHECK(A_h == 0 ? hipErrorOutOfMemory : hipSuccess);
  C_h = reinterpret_cast<float*>(malloc(Nbytes));
  HIPCHECK(C_h == 0 ? hipErrorOutOfMemory : hipSuccess);
  A_h1 = reinterpret_cast<float*>(malloc(Nbytes));
  HIPCHECK(A_h == 0 ? hipErrorOutOfMemory : hipSuccess);
  C_h1 = reinterpret_cast<float*>(malloc(Nbytes));
  HIPCHECK(C_h == 0 ? hipErrorOutOfMemory : hipSuccess);

  // Fill with Phi + i
  for (size_t i = 0; i < Num; i++) {
      A_h[i] = 1.618f + i;
  }
  for (size_t i = 0; i < Num; i++) {
    A_h1[i] = 1.618f + i;
  }

  HIPCHECK(hipMalloc(&A_d, Nbytes));
  HIPCHECK(hipMalloc(&C_d, Nbytes));

  HIPCHECK(hipStreamCreateWithFlags(&mystream1, hipStreamNonBlocking));
  HIPCHECK(hipStreamCreateWithFlags(&mystream2, hipStreamNonBlocking));

  HIPCHECK(hipMemcpyAsync(A_d, A_h, Nbytes, hipMemcpyHostToDevice, mystream1));

  const unsigned threadsPerBlock = 256;
  const unsigned blocks = (Num + 255)/threadsPerBlock;
  int *ptr = NULL;
  int *ptr1 = NULL;
  // Queing jobs in both mystream1/2 followed by hipStreamAddCallback
  for (int i = 1; i < 5; ++i) {
    hipLaunchKernelGGL((vector_square), dim3(blocks), dim3(threadsPerBlock),
                       0, mystream1, C_d, A_d, Num);
    HIPCHECK(hipMemcpyAsync(C_h, C_d, Nbytes, hipMemcpyDeviceToHost,
                            mystream1));
    ptr = new int;
    *ptr = i;
    HIPCHECK(hipStreamAddCallback(mystream1, Callback_Stream1,
                                  reinterpret_cast<void*>(ptr), 0));

    hipLaunchKernelGGL((vector_square), dim3(blocks), dim3(threadsPerBlock),
                       0, mystream2, C_d, A_d, Num);
    HIPCHECK(hipMemcpyAsync(C_h1, C_d, Nbytes,
                            hipMemcpyDeviceToHost, mystream2));
    ptr1 = new int;
    *ptr1 = i;
    HIPCHECK(hipStreamAddCallback(mystream2, Callback_Stream2,
                                  reinterpret_cast<void*>(ptr1), 0));
  }

  HIPCHECK(hipStreamSynchronize(mystream1));
  HIPCHECK(hipStreamSynchronize(mystream2));

  HIPCHECK(hipStreamDestroy(mystream1));
  HIPCHECK(hipStreamDestroy(mystream2));

  HIPCHECK(hipFree(A_d));
  HIPCHECK(hipFree(C_d));
  free(A_h);
  free(C_h);
  free(A_h1);
  free(C_h1);

  // Checking if Stream1_Order has ints in sequencial order or not
  int i = 1;
  for (auto itr=Stream1_Order.begin(); itr != Stream1_Order.end(); ++itr) {
    if (*itr != i) {
      printf("hipStreamAddCallBack() did not execute in sequence");
      printf(" in first stream\n");
      failed("Unexpected behavior!");
    }
    ++i;
  }

  // Checking if Stream2_Order has ints in sequencial order or not
  i = 1;
  for (auto itr=Stream2_Order.begin(); itr != Stream2_Order.end(); ++itr) {
    if (*itr != i) {
      printf("hipStreamAddCallBack() did not execute in sequence");
      printf(" in second stream\n");
      failed("Unexpected behavior!");
    }
    ++i;
  }
  passed();
}