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#include "util/random.hh"
#include <cstdlib>
#include <boost/thread/locks.hpp>
// #include <boost/thread/lock_guard.hpp>
#include <boost/thread/mutex.hpp>
namespace util
{
namespace
{
/** Lock to protect randomizer.
*
* This module is implemented in terms of rand()/srand() from <cstdlib>.
* These functions are standard C, but they're not thread-safe. Scalability
* is not worth much complexity here, so just slap a mutex around it.
*/
boost::mutex rand_lock;
} // namespace
void rand_init(unsigned int seed)
{
boost::lock_guard<boost::mutex> lock(rand_lock);
srand(seed);
}
void rand_init()
{
rand_init(time(NULL));
}
namespace internal
{
// This is the one call to the actual randomizer. All else is built on this.
int rand_int()
{
boost::lock_guard<boost::mutex> lock(rand_lock);
return std::rand();
}
} // namespace internal
} // namespace util
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