1
通过本地对象,我有我的代码的设置是这样的:提升线程不填充引用
class Foo
{
void doWork(std::vector<int>& to_fill)
{
//do some of the filling in another thread
boost::thread thread(&Foo::workToDoInThread, this, to_fill);
//do some filling in the main calling thread
std::vector<int> new_to_fill;
new_to_fill.push_back(0); //other, similar operations
//in case the other thread is still working, wait for it to finish
thread.join();
//combine the two vectors:
to_fill.insert(to_fill.end(), new_to_fill.begin(), new_to_fill.end();
}
void workToDoInThread(std::vector<int>& to_fill)
{
to_fill.push_back(1); //other, similar operations
}
}
这里的问题是,如果它被调用join()
后立即检查to_fill
向量是空的。所以基本上我放弃了其他线程填充的所有值。但如果我这样做:
class Foo
{
std::vector<int> temp_to_fill;
void doWork(std::vector<int>& to_fill)
{
//do some of the filling in another thread
boost::thread thread(&Foo::workToDoInThread, this);
//do some filling in the main calling thread
std::vector<int> new_to_fill;
new_to_fill.push_back(0); //other, similar operations
//in case the other thread is still working, wait for it to finish
thread.join();
//combine the two vectors:
to_fill.insert(to_fill.end(), new_to_fill.begin(), new_to_fill.end();
to_fill.insert(to_fill.end(), temp_to_fill.begin(), temp_to_fill.end();
//clear the temp vector for the next call
temp_to_fill.clear();
}
void workToDoInThread()
{
temp_to_fill.push_back(1); //other, similar operations
}
}
这似乎工作得很好。为什么?
希望我早点知道这一点。当然,看起来更加整齐,然后有一堆临时类变量。 – Ali250
我也第一次被这个人困住了。这就是我知道的原因;) – axalis