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std::unique_lock

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Bibliothèque de support fil
Threads
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Threads
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thread (C++11)
this_thread espace de noms
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this_thread namespace
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get_id (C++11)
yield (C++11)
sleep_for (C++11)
sleep_until (C++11)
L'exclusion mutuelle
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Mutual exclusion
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mutex (C++11)
timed_mutex (C++11)
Gestion du verrouillage générique
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Generic lock management
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lock_guard (C++11)
unique_lock (C++11)
defer_lock_t
try_to_lock_t
adopt_lock_t
(C++11)
(C++11)
(C++11)
lock (C++11)
try_lock (C++11)
defer_lock
try_to_lock
adopt_lock
(C++11)
(C++11)
(C++11)
Les variables de condition
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Condition variables
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condition_variable (C++11)
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notify_all_at_thread_exit (C++11)
cv_status (C++11)
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packaged_task (C++11)
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std::unique_lock
Les fonctions membres
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Member functions
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unique_lock::unique_lock
unique_lock::~unique_lock
unique_lock::operator=
Verrouiller
Original:
Locking
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unique_lock::lock
unique_lock::try_lock
unique_lock::try_lock_for
unique_lock::try_lock_until
unique_lock::unlock
Modificateurs
Original:
Modifiers
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unique_lock::swap
unique_lock::release
Des observateurs
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Observers
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unique_lock::mutex
unique_lock::owns_lock
unique_lock::operator bool
Tiers fonctions
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Non-member functions
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std::swap
 
Defined in header <mutex>
template< class Mutex >
class unique_lock;
(depuis C++11)
Le unique_lock classe est un wrapper polyvalent permettant un verrouillage mutex propriété différé, verrouillage temporisé, verrouillage récursif, le transfert de propriété du verrou, et à utiliser avec les variables de condition .
Original:
The class unique_lock is a general-purpose mutex ownership wrapper allowing deferred locking, timed locking, recursive locking, transfer of lock ownership, and use with condition variables.
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La classe unique_lock est non copiable, mais il est mobile. Le type Mutex fourni doit mettre en œuvre le concept BasicLockable .
Original:
The unique_lock class is non-copyable, but it is movable. The supplied Mutex type shall implement the BasicLockable concept.
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Sommaire

[modifier] Types de membres

Type d'
Original:
Type
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Definition
mutex_type Mutex

[modifier] Fonctions membres

construit un unique_lock, éventuellement verrouiller le mutex fourni
Original:
constructs a unique_lock, optionally locking the supplied mutex
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(fonction membre publique) [edit]
déverrouille le mutex associé, s'il était possédé
Original:
unlocks the associated mutex, if owned
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(fonction membre publique) [edit]
déverrouille le mutex, s'il était possédé, et acquiert la propriété d'un autre
Original:
unlocks the mutex, if owned, and acquires ownership of another
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(fonction membre publique) [edit]
Verrouiller
Original:
Locking
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locks the associated mutex
(fonction membre publique) [edit]
essaie de verrouiller le mutex associé, le rendement si le mutex n'est pas disponible
Original:
tries to lock the associated mutex, returns if the mutex is not available
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(fonction membre publique) [edit]
tente de verrouiller le mutex associé TimedLockable, les retours si le mutex a été indisponible pendant la durée de temps spécifiée
Original:
attempts to lock the associated TimedLockable mutex, returns if the mutex has been unavailable for the specified time duration
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(fonction membre publique) [edit]
essaye de verrouiller le mutex associé TimedLockable, les retours si le mutex est indisponible jusqu'à ce que spécifiée point de temps a été atteinte
Original:
tries to lock the associated TimedLockable mutex, returns if the mutex has been unavailable until specified time point has been reached
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(fonction membre publique) [edit]
déverrouille le mutex associé
Original:
unlocks the associated mutex
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(fonction membre publique) [edit]
Modificateurs
Original:
Modifiers
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swaps affirmer avec une autre std::unique_lock
Original:
swaps state with another std::unique_lock
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(fonction membre publique) [edit]
dissocie le mutex associé sans le déverrouiller
Original:
disassociates the associated mutex without unlocking it
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(fonction membre publique) [edit]
Des observateurs
Original:
Observers
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renvoie un pointeur sur le mutex associé
Original:
returns a pointer to the associated mutex
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(fonction membre publique) [edit]
teste si la serrure possède sa mutex associé
Original:
tests whether the lock owns its associated mutex
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(fonction membre publique) [edit]
teste si la serrure possède sa mutex associé
Original:
tests whether the lock owns its associated mutex
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(fonction membre publique) [edit]

[modifier] Fonctions annexes

spécialisation des std::swap pour unique_lock
Original:
specialization of std::swap for unique_lock
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(fonction générique) [edit]

[modifier] Exemple

#include <mutex>
#include <thread>
#include <chrono>
 
struct Box {
    explicit Box(int num) : num_things{num} {}
 
    int num_things;
    std::mutex m;
};
 
void transfer(Box &from, Box &to, int num)
{
    // don't actually take the locks yet
    std::unique_lock<std::mutex> lock1(from.m, std::defer_lock);
    std::unique_lock<std::mutex> lock2(to.m, std::defer_lock);
 
    // lock both unique_locks without deadlock
    std::lock(lock1, lock2);
 
    from.num_things -= num;
    to.num_things += num;
 
    lock1.unlock();
    lock2.unlock();
}
 
int main()
{
    Box acc1(100);
    Box acc2(50);
 
    std::thread t1(transfer, std::ref(acc1), std::ref(acc2), 10);
    std::thread t2(transfer, std::ref(acc2), std::ref(acc1), 5);
 
    t1.join();
    t2.join();
}