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std::unique_lock

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Biblioteca de suporte a discussão
Threads
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Threads
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thread(C++11)
this_thread namespace
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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)
Exclusão mútua
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Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Gestão de bloqueio genérico
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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)
Variáveis ​​de condição
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Condition variables
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condition_variable(C++11)
condition_variable_any(C++11)
notify_all_at_thread_exit(C++11)
cv_status(C++11)
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Futures
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promise(C++11)
future(C++11)
shared_future(C++11)
packaged_task(C++11)
async(C++11)
launch(C++11)
future_status(C++11)
future_error(C++11)
future_category(C++11)
future_errc(C++11)
 
std::unique_lock
Funções de membro
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Member functions
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unique_lock::unique_lock
unique_lock::~unique_lock
unique_lock::operator=
Bloqueio
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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
Modificadores
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Modifiers
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unique_lock::swap
unique_lock::release
Observadores
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Observers
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unique_lock::mutex
unique_lock::owns_lock
unique_lock::operator bool
Não-membros funções
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Non-member functions
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std::swap
 
Defined in header <mutex>
template< class Mutex >
class unique_lock;
(a partir do C++ 11)
O unique_lock classe é um propósito geral invólucro propriedade mutex permitindo bloqueio diferido, fecho cronometrada, fecho recursiva, transferência de propriedade de bloqueio, e usar com variáveis ​​de condição.
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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A classe unique_lock é não copiável, mas é móvel. O tipo Mutex fornecido deve implementar o conceito 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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Índice

[editar] Tipos de membro

Tipo
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Type
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Definition
mutex_type Mutex

[editar] Funções de membro

constrói um unique_lock, opcionalmente bloquear o mutex fornecido
Original:
constructs a unique_lock, optionally locking the supplied mutex
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(função pública membro) [edit]
destrave o mutex associado, se possuído
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unlocks the associated mutex, if owned
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(função pública membro) [edit]
destrave o mutex, se possuía, e adquire a propriedade de outro
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unlocks the mutex, if owned, and acquires ownership of another
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(função pública membro) [edit]
Bloqueio
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Locking
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locks the associated mutex
(função pública membro) [edit]
tenta bloquear o mutex associado, retorna se o mutex não está disponível
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tries to lock the associated mutex, returns if the mutex is not available
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(função pública membro) [edit]
tentativas de bloquear o mutex associado TimedLockable, os retornos se o mutex esteve indisponível durante o período de tempo especificado
Original:
attempts to lock the associated TimedLockable mutex, returns if the mutex has been unavailable for the specified time duration
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(função pública membro) [edit]
tenta bloquear o associado TimedLockable mutex, retorna se o mutex tem sido disponível até que ponto especificado de tempo tenha sido atingido
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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(função pública membro) [edit]
destrave o mutex associado
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unlocks the associated mutex
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(função pública membro) [edit]
Modificadores
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Modifiers
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swaps afirmar com outro std::unique_lock
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swaps state with another std::unique_lock
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(função pública membro) [edit]
dissocia o mutex associado sem desbloquear ele
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disassociates the associated mutex without unlocking it
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(função pública membro) [edit]
Observadores
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Observers
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retorna um ponteiro para o mutex associado
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returns a pointer to the associated mutex
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(função pública membro) [edit]
testa se o bloqueio é dono da sua mutex associado
Original:
tests whether the lock owns its associated mutex
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(função pública membro) [edit]
testa se o bloqueio é dono da sua mutex associado
Original:
tests whether the lock owns its associated mutex
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(função pública membro) [edit]

[editar] Não-membros funções

especialização de std::swap para unique_lock
Original:
specialization of std::swap for unique_lock
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(modelo de função) [edit]

[editar] Exemplo

#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();
}