On 2010-08-13 15:21:29 +0200, Benjamin Sobotta said:

On Friday 13 August 2010 13:46, Kraus Philipp wrote:

...

Hi,

I would like to use Boost threads, but I don't work with them. I know only Java Threads.

The problem, in which should use threads: I have some stochastic and numerical optimization, which all can calculate independent (no mutex, synchronizsation or something else).

I've found boost::thread and boost::bind for creating threads (call a method of an object).

In Java I would write this code structure:

myThread first = new myThread(); first.setParameter1(....) first.setParameter1(....)

Thread th = new Thread(first); th.start();

first.getData()

I would like to have an object of calculation, which receives only after creating different parameters and then calculates the data on more than one thread. After completion of the calculation, I can let me deliver the data back from any object, like:

std::vector<myWorker> x; for(int i=0; i < numThreads; ++i) { x.push_back( myWorker() ); x[i].setParameter(....); }

createThreadGroup (x); wait until ThreadGroup is finish

for(int i=0; i < numThreads; ++i) x[i].getData()

How can do this with Boost Thread? Is this the correct way or can I do this more efficient?

Thanks

Phil

Hi!

Ok if I understand this right you want one thread per worker object?! I would do something like

Yes. Each Object (Worker) = one Thread

std::vector<myWorker> x; for(int i=0; i < numThreads; ++i) { x.push_back( myWorker() ); x[i].setParameter(....); }

boost::thread_group threads;

for(int i=0; i < numThreads; ++i) { threads.create_thread(boost::bind(&myWorker::compute_stuff), x[i]); }

threads.join_all();

// retrieve information from the workers

That would send a thread into each myWorker with entry point compute_stuff(). At least in theory. Right now I've no way / time of testing a setup like this.

I will test it and report Thanks Phil