Re: std::thread...too little, too late?
On 18/12/2014 11:36, me wrote:
I was looking at what made its way into the C++11 standard in the way of
threads, and it seems very braindead. I mean third party libraries have
been giving us working threading for years, and "THAT"was all they came
up with for the standard?
I fully understand the implications of adding features that need to be
portable and that give a good least common denominator, but std::thread
seems too little, too late.
I thought it would be easy to at least build upon the std::thread class
and to something that more closely resembles the common threading utility
available in a variety of libraries: something with delayed thread
starting, and the ability to make the process OO with a virtual run()
method...no such luck.
Consider the following example that uses std::thread as a class trait and
then subclasses a UsefulThread class, adding the requested functionality:
class UsefulThread {
thread* stdThread;
public:
UsefulThread();
virtual ~UsefulThread() { delete stdThread; }
virtual void run()=0;
void start() { stdThread=new thread(run); }
void join() { stdThread->join(); }
};
class WorkerThread: public UsefulThread {
int _id;
BufferObject& r;
public:
WorkerThread(int id, BufferObject& b): UsefulThread(), _id(id), r(b)
{}
virtual void run() { for (auto i=0; i<_id; i++) r << _id; }
// share r object is made threadsafe with an internal mutex
};
int main(int argc, char** argv) {
using namespace std;
list<int> v ={1, 2, 3, 4, 5, 6, 7, 8, 9};
BufferObject b;
list<WorkerThread> threadList;
for (auto i: v) { WorkerThread t(i, b); threadList.push_back(t); };
for (auto i: threadList) i.start();
for (auto i: threadList) i.join();
cout << b.str() << endl;
return 0;
}
There is no way (that I can tell of) to make the UsefulThread::start()
method properly register the run() virtual. There was an article online
Stop fucking moaning mate.
void start() { stdThread=new thread(std::bind(&UsefulThread::run, this)); }
/Flibble