text: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  #include <dmlc/logging.h>
  #include <gtest/gtest.h>
  #include <tvm/support/parallel_for.h>
  
  #include <vector>
  
  TEST(ParallelFor, Basic) {
    using tvm::support::parallel_for;
  
    int a[1000], b[1000];
  
    // Check for a small size of parallel
    for (int i = 0; i < 10; i++) {
      a[i] = i;
    }
    parallel_for(0, 10, [&b](int i) { b[i] = i; });
    for (int i = 0; i < 10; i++) {
      CHECK_EQ(a[i], b[i]);
    }
  
    // Check for a large size of parallel
    for (int i = 0; i < 1000; i++) {
      a[i] = i;
    }
    parallel_for(0, 1000, [&b](int i) { b[i] = i; });
    for (int i = 0; i < 1000; i++) {
      CHECK_EQ(a[i], b[i]);
    }
  
    // Check for step != 1
    for (int i = 0; i < 1000; i += 2) {
      a[i] *= 2;
    }
    parallel_for(
        0, 1000, [&b](int i) { b[i] *= 2; }, 2);
    for (int i = 0; i < 1000; i++) {
      CHECK_EQ(a[i], b[i]);
    }
  }
  
  TEST(ParallelFor, NestedWithNormalForLoop) {
    using tvm::support::parallel_for;
  
    int a[500][500], b[500][500], c[500][500];
  
    for (int i = 0; i < 500; i++) {
      for (int j = 0; j < 500; j++) {
        a[i][j] = i * j;
      }
    }
  
    parallel_for(0, 500, [&b](int i) {
      for (int j = 0; j < 500; j++) {
        b[i][j] = i * j;
      }
    });
    for (int i = 0; i < 500; i++) {
      for (int j = 0; j < 500; j++) {
        CHECK_EQ(a[i][j], b[i][j]);
      }
    }
  
    for (int i = 0; i < 500; i++) {
      parallel_for(0, 500, [&c, &i](int j) { c[i][j] = i * j; });
    }
    for (int i = 0; i < 500; i++) {
      for (int j = 0; j < 500; j++) {
        CHECK_EQ(a[i][j], c[i][j]);
      }
    }
  }
  
  TEST(Parallelfor, NestedWithParallelFor) {
    // Currently do not support using nested parallel_for
    using tvm::support::parallel_for;
  
    bool exception = false;
    try {
      parallel_for(0, 100, [](int i) {
        parallel_for(0, 100, [](int j) {
          // Blank loop
        });
      });
    } catch (const std::exception& e) {
      exception = true;
    }
    CHECK(exception);
  }
  
  TEST(ParallelFor, Exception) {
    using tvm::support::parallel_for;
  
    bool exception = false;
    try {
      parallel_for(0, 100, [](int i) { LOG(FATAL) << "error"; });
    } catch (const std::exception& e) {
      exception = true;
    }
    CHECK(exception);
  }
  
  int main(int argc, char** argv) {
    testing::InitGoogleTest(&argc, argv);
    testing::FLAGS_gtest_death_test_style = "threadsafe";
    return RUN_ALL_TESTS();
  }
  