如何在线程本身终止时删除boost线程对象？

Question

将线程添加到boost :: thread_group时:

boost::thread_group my_threads;
boost::thread *t = new boost::thread( &someFunc );
my_threads.add_thread(th);

只有当my_threads对象超出范围时,才会删除所有创建的boost :: thread对象.但是我的程序主线程在执行时产生了很多线程.因此,如果已经完成了大约50个线程,程序将使用大约1.5Gb的内存,并且仅在主进程终止时释放该内存.

问题是:如何在线程函数完成后删除这些boost :: thread对象？!

Answer 1

你可以这样做,但心灵同步(最好使用共享指针boost :: thread_group而不是引用,除非你确定,该线程组将活得足够长):

void someFunc(..., boost::thread_group & thg, boost::thread * thisTh)
{
  // do sth

  thg.remove_thread(thisThr);
  delete thisTh; // we coud do this as thread of execution and boost::thread object are quite independent
}

void run()
{
  boost::thread_group my_threads;
  boost::thread *t = new boost::thread(); // invalid handle, but we need some memory placeholder, so we could pass it to someFunc
  *t = boot::thread(
    boost::bind(&someFunc, boost::ref(my_threads), t)
  );
  my_threads.add_thread(t);
  // do not call join
}

您还可以检查at_thread_exit()函数.

无论如何,boost :: thread对象的重量不应超过30 MB.