c++ - 英特尔 TBB 在并行线程中运行函数？

Question

基本上我正在开发一个 opencv 应用程序。我在 cmake 中构建了 OpenCV with_tbb 选项。

我想使用 intel tbb 来运行一个并行线程，它会在某些时间间隔更新一些全局变量。像这样的东西:

vector<int> mySharedVar;

void secondaryThreadFunction() {
 while(true) {
   Do some operations
   And update mySharedVar if necessarily  

   usleep(1000);
 }
}

int main() {
   run in parallel secondaryThreadFunction;

   in the master Thread keep doing something based on mySharedVar

   while(true) {
    do something;
   }
}

如何在另一个线程上运行 secondaryThreadFunction()？

Answer 1

英特尔 TBB 并非旨在用于此类目的。引自 Tutorial :

Intel® Threading Building Blocks targets threading for performance. Most general-purpose threading packages support many different kinds of threading, such as threading for asynchronous events in graphical user interfaces. As a result, general-purpose packages tend to be low-level tools that provide a foundation, not a solution. Instead, Intel® Threading Building Blocks focuses on the particular goal of parallelizing computationally intensive work, delivering higher-level, simpler solutions.

你想做的事情可以通过 boost::thread 或 C++11 线程特性轻松实现:

   // using async
   auto fut = std::async(std::launch::async, secondaryThreadFunction);
   // using threads (for boost, just replace std with boost)
   std::thread async_thread(secondaryThreadFunction);

   in the master Thread keep doing something based on mySharedVar

   while(true) {
    do something;
   }

   // in case of using threads
   async_thread.join();

请记住同步对任何共享变量的访问。