C++11 - gcc conditional_var problem

Bonjour,
j'ai fait un petit exercice en C++11.
But : Créer 2 threads, qui prennent la main chacun leur tour

Ca fonctionne sous VS 2012, gcc 4.7.2.
Ca reste bloqué sous gcc 4.8.0. Le dernier "joueur" ne reçoit pas un
signal. En remplaçant la lambda, ça bloque aussi sous gcc 4.4


Auriez-vous une idée de mon erreur ?

#include <iostream>
#include <string>
#include <thread>
#include <mutex>
#include <condition_variable>

// ---------------------------------------------------------------------
const int OnePlayerGameMaxDuration = 3;

// ---------------------------------------------------------------------
std::thread::id LastPlayingPlayer;
std::mutex LastPlayingPlayerMutex;
std::condition_variable LastPlayingPlayerCondVar;

// ---------------------------------------------------------------------
bool IsLastPlayer(const std::thread::id& id)
{
return (LastPlayingPlayer == id);
}

// ---------------------------------------------------------------------
void SetLastPlayer(const std::thread::id& id)
{
LastPlayingPlayer = id;
}

// ---------------------------------------------------------------------
void Player(const std::string& playerName)
{
std::thread::id playerId = std::this_thread::get_id();

for (int i = 0; i < OnePlayerGameMaxDuration; ++i)
{
std::unique_lock<std::mutex> lock(LastPlayingPlayerMutex);
while(IsLastPlayer(playerId))
LastPlayingPlayerCondVar.wait(lock); // Wait someone else

std::cout << playerName << std::endl;

SetLastPlayer(playerId);

// Notify another player, the play is done
LastPlayingPlayerCondVar.notify_one();
}
}

// --------------------------------------------------------------------
int main()
{
// Game started
std::cout << "Ready...Set...Go!" << std::endl;

// Start 2 players : Ping! and Pong!
std::thread player1([] { Player("Ping!"); });
std::thread player2([] { Player("Pong!"); });

// Wait for the players to finish
player1.join();
player2.join();

// Game finished
std::cout << "Done!" << std::endl;
}