OpenMP编程-同步机制

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/* nowait用来取消栅障 */
void test12()
{
#pragma omp parallel  {  
#pragma omp for nowait  for (int i = 0; i < 100; ++i)   {  std::cout << i << "+" << std::endl;  }  
#pragma omp for  for (int j = 0; j < 100; ++j)   {  std::cout << j << "-" << std::endl;  }  }  
}

/* 显式同步栅障  在barrier处进行了同步，然后执行后边的for循环。 */
void test13()
{
#pragma omp parallel  {  for (int i = 0; i < 100; ++i)   {  cout<<"ID "<<omp_get_thread_num()<<" ";std::cout << i << "+" << std::endl;  }  #pragma omp barrier  for (int j = 0; j < 100; ++j)   {  cout<<"ID "<<omp_get_thread_num()<<" ";std::cout << j << "-" << std::endl;  }  }  
}

/* 声明对应的并行程序块只由主线程完成  */
void test14()
{
#pragma omp parallel  {  
#pragma omp master  {  for (int j = 0; j < 10; ++j)   {  std::cout << j << "-" << std::endl;  }  }  std::cout << "This will printed twice." << std::endl;  }  
}

/*  section用来指定不同的线程执行不同的部分  */
void test15()
{
#pragma omp parallel sections //声明该并行区域分为若干个section,section之间的运行顺序为并行的关系  {  
#pragma omp section //第一个section,由某个线程单独完成  for (int i = 0; i < 5; ++i)   {  std::cout <<"i "<< i << "+" << std::endl;  cout<<"ID "<<omp_get_thread_num()<<" ";}  #pragma omp section //第一个section,由某个线程单独完成  for (int j = 0; j < 5; ++j)   {  std::cout<<"j " << j << "-" << std::endl;  cout<<"ID "<<omp_get_thread_num()<<" ";}  }  
}

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