#include <iostream>
#include <stdexcept>
#include <cstdlib>
#include <pthread.h>

using namespace std;

typedef void* (*thread_func) (void* arg);

struct thread {
    pthread_t self;
    thread (thread_func f, void* arg = 0) {
        if (0 != pthread_create (&self, 0, f, static_cast<void*> (arg)))
            throw std::runtime_error (strerror (errno));
    }
    void detach () { pthread_detach (self); }
    void join () { pthread_join (self, 0); }
};

void*
identity (void* arg) { return arg; }

int main ()
{
    int numthreads = 0;

    try
        {
        while (1)
            {
            thread t (identity);

            if (++numthreads % 100 == 0)
                cout << numthreads << ' ' << flush;
            }
        }
    catch (std::exception& e)
        {
        cerr << "Caught exception after " << numthreads << " threads: "
             << e.what () << endl;
        }
}