std::thread calling method of class [duplicate]

Question

Possible Duplicate:
Start thread with member function

I have a small class:

class Test { public: void runMultiThread(); private: int calculate(int from, int to); }

How its possible to run method calculate with two differents set of parametrs(for example calculate(0,10), calculate(11,20)) in two threads from method runMultiThread()?

Kerrek SB · Accepted Answer · 2012-06-12 14:40:55Z

259

Not so hard:

#include <thread> void Test::runMultiThread() { std::thread t1(&Test::calculate, this, 0, 10); std::thread t2(&Test::calculate, this, 11, 20); t1.join(); t2.join(); }

If the result of the computation is still needed, use a future instead:

#include <future> void Test::runMultiThread() { auto f1 = std::async(&Test::calculate, this, 0, 10); auto f2 = std::async(&Test::calculate, this, 11, 20); auto res1 = f1.get(); auto res2 = f2.get(); }

edited Jun 12, 2012 at 14:40

answered Jun 12, 2012 at 14:32

Kerrek SB

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14 Comments

Kerrek SB Over a year ago

@ravenspoint: Whether it's threadsafe is up to the OP, non? I agree that the return value should be recovered, though the OP doesn't indicate that that's intended (it could be like printf). std::async would be an alternative.

Christian Rau Over a year ago

@JonathanWakely Maybe because the OP asked so? Though we don't know if his approach is correct in the first place, but maybe he does other computations meanwhile.

Mike Seymour Over a year ago

@ravenspoint: The question asked how to run a function in different threads with different arguments, and this answer clearly demonstrates how to do that. How is that not useful?

Sarfaraz Nawaz Over a year ago

@ravenspoint: Those are other questions; and there can more other questions as well.

Kerrek SB Over a year ago

I didn't think that the number of threads would be a point of contention. I'm merely demonstrating the techniques; I'm confident the OP can arrange the code in any fashion that suits her ultimate concurrency needs.

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