c++ - 是否有可用于 C++ 的广泛使用的多处理抽象库？

Question

我来自 Python，正全力转向 C++。而且，我最近提出的一个问题是:C++ 中是否有广泛使用的开源多处理抽象库？我正在考虑使多处理(ala fork)更易于管理的东西，类似于 Python 的 multiprocessing stdlib 库。

我想没有这样的东西。我完全希望有一个 Boost::Process 就像有一个 Boost::Thread .

Answer 1

OpenMP(Open Multi-Processing)是我所知道的唯一库 http://en.wikipedia.org/wiki/OpenMP -- 然而，它并不像 Python 通过创建新进程那样处理事情。 OpenMP 是编译器扩展，受 Microsoft 支持和 GNU GCC .

示例:OpenMP sieve of eratosthenes

// odd-only sieve
int eratosthenesOdd(int lastNumber, bool useOpenMP)
{
  // enable/disable OpenMP
  omp_set_num_threads(useOpenMP ? omp_get_num_procs() : 1);
  // instead of i*i <= lastNumber we write i <= lastNumberSquareRoot to help OpenMP
  const int lastNumberSqrt = (int)sqrt((double)lastNumber);
  int memorySize = (lastNumber-1)/2;
  // initialize
  char* isPrime = new char[memorySize+1];
  #pragma omp parallel for
  for (int i = 0; i <= memorySize; i++)
    isPrime[i] = 1;
  // find all odd non-primes
  #pragma omp parallel for schedule(dynamic)
  for (int i = 3; i <= lastNumberSqrt; i += 2)
    if (isPrime[i/2])
      for (int j = i*i; j <= lastNumber; j += 2*i)
        isPrime[j/2] = 0;
  // sieve is complete, count primes
  int found = lastNumber >= 2 ? 1 : 0;
  #pragma omp parallel for reduction(+:found)
  for (int i = 1; i <= memorySize; i++)
    found += isPrime[i];
  delete[] isPrime;
  return found;
}