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std::lock_guard

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Mutual exclusion
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mutex (C++11)
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Gestion du verrouillage générique
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Generic lock management
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lock_guard (C++11)
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lock (C++11)
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std::lock_guard
Les fonctions membres
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Member functions
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lock_guard::lock_guard
lock_guard::~lock_guard
 
Defined in header <mutex>
template< class Mutex >
class lock_guard;
(depuis C++11)
La classe lock_guard mutex est une enveloppe qui fournit un mécanisme RAII de style commode pour posséder un mutex pour la durée d'un bloc de portée .
Original:
The class lock_guard is a mutex wrapper that provides a convenient RAII de style mechanism for owning a mutex for the duration of a scoped block.
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Quand un objet est créé lock_guard, il tente de prendre la propriété du mutex il est donné. Lorsque le contrôle quitte le champ dans lequel l'objet a été créé lock_guard, le lock_guard est détruit et le mutex est libéré .
Original:
When a lock_guard object is created, it attempts to take ownership of the mutex it is given. When control leaves the scope in which the lock_guard object was created, the lock_guard is destructed and the mutex is released.
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La classe lock_guard est non copiable. Le type Mutex fourni doit mettre en œuvre le concept BasicLockable .
Original:
The lock_guard class is non-copyable. The supplied Mutex type shall implement the BasicLockable concept.
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[modifier] Types de membres

Type du membre Définition
mutex_type
Mutex
Original:
Mutex
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[modifier] Fonctions membres

construit un lock_guard, éventuellement verrouiller le mutex
Original:
constructs a lock_guard, optionally locking the given mutex
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(fonction membre publique) [edit]
Détruit l'objet lock_guard, déverrouille le mutex sous-jacent
Original:
destructs the lock_guard object, unlocks the underlying mutex
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(fonction membre publique) [edit]

[modifier] Exemple

#include <thread>
#include <mutex>
 
int g_i = 0;
std::mutex g_i_mutex;  // protects g_i
 
void safe_increment()
{
    std::lock_guard<std::mutex> lock(g_i_mutex);
    ++g_i;
 
    // g_i_mutex is automatically released when lock
    // goes out of scope
}
 
int main()
{
    std::thread t1(safe_increment);
    std::thread t2(safe_increment);
 
    t1.join();
    t2.join();
}