dlib C++ Library - async.cpp

// Copyright (C) 2016 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_AsYNC_CPP_
#define DLIB_AsYNC_CPP_ 
// C++11 things don't work in old versions of visual studio 
#if !defined( _MSC_VER) || _MSC_VER >= 1900
#include "async.h"
#include <stdlib.h>
#include "../string.h"
#include <thread>
namespace dlib
{
// ----------------------------------------------------------------------------------------
 namespace impl
 {
 unsigned long default_num_threads()
 {
 try
 {
 char* nt = getenv("DLIB_NUM_THREADS");
 if (nt)
 return string_cast<unsigned long>(nt);
 } catch(string_cast_error&) {}
 return std::thread::hardware_concurrency();
 }
 }
// ----------------------------------------------------------------------------------------
 thread_pool& default_thread_pool()
 {
 static thread_pool tp(impl::default_num_threads());
 return tp;
 }
}
// ----------------------------------------------------------------------------------------
#endif
#endif // DLIB_AsYNC_CPP_