如何使用 Boost 制作关键部分?

2022-01-22 00:00:00 multithreading synchronization c++ boost critical-section

对于我的跨平台应用程序，我已经开始使用 Boost，但我无法理解如何实现代码来重现 Win32 的关键部分或 .Net 的 lock 的行为.

For my cross-platform application I have started to use Boost, but I can't understand how I can implement code to reproduce behavior of Win32's critical section or .Net's lock.

我想写一个方法Foo，可以从不同的线程调用来控制对共享字段的写操作.应该允许同一线程内的递归调用(Foo() -> Foo()).

I want to write a method Foo that can be called from different threads to control write operations to shared fields. Recursive calls within the same thread should be allowed (Foo() -> Foo()).

在 C# 中这个实现非常简单:

In C# this implementation is very simple:

object _synch = new object();
void Foo()
{
    lock (_synch)  // one thread can't be lock by him self, but another threads must wait untill
    {
        // do some works
        if (...) 
        {
           Foo();
        }
    }
}

推荐答案

通过 boost 你可以使用 boost::lock_guard<> class:

With boost you can use boost::lock_guard<> class:

class test
{
public:
 void testMethod()
 {
  // this section is not locked
  {
   boost::lock_guard<boost::recursive_mutex> lock(m_guard);
   // this section is locked
  }
  // this section is not locked
 }
private:
    boost::recursive_mutex m_guard;
};

PS 这些类位于 Boost.Thread 库中.

PS These classes located in Boost.Thread library.

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