std::lock_guard

 

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std::lock_guard

Les fonctions membres Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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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Types de membres

Type du membre	Définition
mutex_type	Mutex Original: Mutex The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Fonctions membres

(constructor)	construit un lock_guard, éventuellement verrouiller le mutex Original: constructs a lock_guard, optionally locking the given mutex The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique)
(destructor)	Détruit l'objet lock_guard, déverrouille le mutex sous-jacent Original: destructs the lock_guard object, unlocks the underlying mutex The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique)

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();
}