#include <boost/signals2/mutex.hpp>
std::vector<boost::shared_ptr<boost::signals2::mutex> > locks;
void locking_function(int mode, int n, const char *file, int line){
    if((mode & CRYPTO_LOCK))
        locks[n]->lock();
    else
        locks[n]->unlock();
}
void setup_locks(){
    locks.reserve(CRYPTO_num_locks());
    for(int i=0;i<CRYPTO_num_locks();i++){
        locks.push_back(boost::shared_ptr<boost::signals2::mutex>(new boost::signals2::mutex()));
    }
    CRYPTO_set_locking_callback((void (*)(int,int,const char *,int))locking_function);
}