text: /*
  Copyright (c) 2020 - 2021 Advanced Micro Devices, Inc. All rights reserved.
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANNTY OF ANY KIND, EXPRESS OR
  IMPLIED, INNCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANNY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER INN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR INN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  */
  
  // Testcase Description: This test case is used to check the behaviour of HIP
  // when multiple hipStreaAddCallback() are called over multiple Threads
  // This test case is disabled currently.
  
  /* HIT_START
   * BUILD: %t %s ../../test_common.cpp NVCC_OPTIONS --std=c++11
   * TEST: %t
   * HIT_END
   */
  
  
  
  #include <stdio.h>
  #include <thread>
  #include <chrono>
  #include <atomic>
  #include "hip/hip_runtime.h"
  #include "test_common.h"
  
  #ifdef __HIP_PLATFORM_AMD__
  #define HIPRT_CB
  #endif
  
  #define NUM_THREADS 2000
  
  size_t Num = 4096;
  std::atomic<size_t>Cb_count{0}, Data_mismatch{0};
  hipStream_t mystream;
  float *A_h, *C_h;
  
  __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);
    }
  }
  
  
  static void HIPRT_CB Thread1_Callback(hipStream_t stream, hipError_t status,
                                        void* userData) {
    for (size_t i = 0; i < Num; i++) {
      // Validate the data and update Data_mismatch
      if (C_h[i] != A_h[i] * A_h[i]) {
        Data_mismatch++;
      }
    }
  
    // Increment the Cb_count to indicate that the callback is processed.
    ++Cb_count;
  }
  
  static void HIPRT_CB Thread2_Callback(hipStream_t stream, hipError_t status,
                                        void* userData) {
    for (size_t i = 0; i < Num; i++) {
      // Validate the data and update Data_mismatch
      if (C_h[i] != A_h[i] * A_h[i]) {
        Data_mismatch++;
      }
    }
  
    // Increment the Cb_count to indicate that the callback is processed.
    ++Cb_count;
  }
  
  void Thread1_func() {
    HIPCHECK(hipStreamAddCallback(mystream, Thread1_Callback, NULL, 0));
  }
  
  void Thread2_func() {
    HIPCHECK(hipStreamAddCallback(mystream, Thread2_Callback, NULL, 0));
  }
  
  
  int main(int argc, char* argv[]) {
    float *A_d, *C_d;
    size_t Nbytes = Num * sizeof(float);
  
    A_h = (float*)malloc(Nbytes);
    HIPCHECK(A_h == 0 ? hipErrorOutOfMemory : hipSuccess);
    C_h = (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;
    }
  
    HIPCHECK(hipMalloc(&A_d, Nbytes));
    HIPCHECK(hipMalloc(&C_d, Nbytes));
  
    HIPCHECK(hipStreamCreateWithFlags(&mystream, hipStreamNonBlocking));
  
    HIPCHECK(hipMemcpyAsync(A_d, A_h, Nbytes, hipMemcpyHostToDevice, mystream));
  
    const unsigned threadsPerBlock = 256;
    const unsigned blocks = (Num+255)/threadsPerBlock;
  
    hipLaunchKernelGGL((vector_square), dim3(blocks), dim3(threadsPerBlock), 0,
                        mystream, C_d, A_d, Num);
  
    HIPCHECK(hipMemcpyAsync(C_h, C_d, Nbytes, hipMemcpyDeviceToHost, mystream));
  
    auto thread_count = getHostThreadCount(200, NUM_THREADS);
    if (thread_count == 0) {
      failed("Thread count is 0");
    }
    std::thread *T = new std::thread[thread_count];
    for (int i = 0; i < thread_count; i++) {
      // Use different callback for every even thread
      // The callbacks will be added to same stream from different threads
      if ((i%2) == 0)
        T[i] = std::thread(Thread1_func);
      else
        T[i] = std::thread(Thread2_func);
    }
  
    // Wait until all the threads finish their execution
    for (int i = 0; i < thread_count; i++) {
      T[i].join();
    }
  
    HIPCHECK(hipStreamSynchronize(mystream));
    HIPCHECK(hipStreamDestroy(mystream));
  
    HIPCHECK(hipFree(A_d));
    HIPCHECK(hipFree(C_d));
  
    free(A_h);
    free(C_h);
  
    // Cb_count should match total number of callbacks added from both threads
    // Data_mismatch will be updated if there is problem in data validation
    if (Cb_count.load() != thread_count) {
       failed("All callbacks for stream did not get called!");
    } else if (Data_mismatch.load() != 0) {
       failed("Mismatch found in the result of the computation!");
    }
    delete[] T;
  
    passed();
  }
  