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std::unique_lock

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C++
 
Tema Biblioteca de ayuda
Threads
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Threads
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(C++11)
this_thread espacio de nombres
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this_thread namespace
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(C++11)
(C++11)
(C++11)
(C++11)
Exclusión mutua
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Mutual exclusion
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(C++11)
(C++11)
Gestión de bloqueos genérico
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Generic lock management
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(C++11)
unique_lock
(C++11)
(C++11)(C++11)(C++11)
(C++11)
(C++11)
(C++11)(C++11)(C++11)
Las variables de condición
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Condition variables
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(C++11)
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Futuros
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Futures
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(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
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std::unique_lock
Las funciones miembro
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Member functions
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Bloqueo
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Locking
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Modificadores
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Modifiers
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Los observadores
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Observers
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Terceros funciones
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Non-member functions
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Definido en la cabecera <mutex>
template< class Mutex >
class unique_lock;
 (desde C++11)
La clase unique_lock es un contenedor de uso general de propiedad de mutex, que permite bloqueo diferido, cierre temporizado, cierre recursivo, la transferencia de la propiedad de bloqueo, y el uso con las variables de condición .
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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 clase unique_lock no es copiable, pero es movible. El tipo Mutex suministrado deberá aplicar el concepto BasicLockable .
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The unique_lock class is non-copyable, but it is movable. The supplied Mutex type shall implement the BasicLockable concept.
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Contenido

[editar] Tipos de miembros

Tipo
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Type
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 Definition
mutex_type Mutex

[editar] Las funciones miembro
construye una unique_lock, opcionalmente bloquear el mutex suministrado
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constructs a unique_lock, optionally locking the supplied mutex
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(función miembro público) [editar]
desbloquea el mutex asociado, si su propiedad
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unlocks the associated mutex, if owned
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(función miembro público) [editar]
desbloquea el mutex, si es de propiedad, y adquiere la propiedad de otro
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unlocks the mutex, if owned, and acquires ownership of another
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(función miembro público) [editar]
Bloqueo
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Locking
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 locks the associated mutex
(función miembro público) [editar]
intenta bloquear el mutex asociado, devoluciones si el mutex no está disponible
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tries to lock the associated mutex, returns if the mutex is not available
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(función miembro público) [editar]
intenta bloquear el mutex asociado TimedLockable, devoluciones si el mutex no ha estado disponible para la duración de tiempo especificado
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attempts to lock the associated TimedLockable mutex, returns if the mutex has been unavailable for the specified time duration
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(función miembro público) [editar]
intenta bloquear el mutex asociado TimedLockable, devoluciones si el mutex no ha estado disponible hasta que se especifique punto de tiempo se ha alcanzado
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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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(función miembro público) [editar]
desbloquea el mutex asociado
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unlocks the associated mutex
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(función miembro público) [editar]
Modificadores
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Modifiers
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swaps afirmar con otro std::unique_lock
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swaps state with another std::unique_lock
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(función miembro público) [editar]
disocia la exclusión mutua asociada sin desbloquearlo
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disassociates the associated mutex without unlocking it
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(función miembro público) [editar]
Los observadores
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Observers
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devuelve un puntero a la exclusión mutua asociado
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returns a pointer to the associated mutex
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(función miembro público) [editar]
comprueba si el bloqueo de exclusión mutua es dueña de su asociado
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tests whether the lock owns its associated mutex
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(función miembro público) [editar]
comprueba si el bloqueo de exclusión mutua es dueña de su asociado
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tests whether the lock owns its associated mutex
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(función miembro público) [editar]

[editar] Terceros funciones
especialización de std::swap para unique_lock
Original:
specialization of std::swap for unique_lock
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(plantilla de función) [editar]

[editar] Ejemplo

#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();
}


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