Namespace
Varianti

std::unique_lock

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Discussione libreria di supporto
Threads
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Threads
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thread(C++11)
this_thread spazio dei nomi
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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)
Mutua esclusione
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Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Blocco di gestione generico
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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)
Condizioni variabili
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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)
Futures
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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
Membri funzioni
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Member functions
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unique_lock::unique_lock
unique_lock::~unique_lock
unique_lock::operator=
Bloccaggio
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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
Modificatori
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Modifiers
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unique_lock::swap
unique_lock::release
Osservatori
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Observers
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unique_lock::mutex
unique_lock::owns_lock
unique_lock::operator bool
Non membri funzioni
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Non-member functions
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std::swap
 
Defined in header <mutex>
template< class Mutex >
class unique_lock;
(dal C++11)
Il unique_lock classe è un general-purpose involucro proprietà mutex permettendo chiusura differita, chiusura temporizzata, chiusura ricorsiva, il trasferimento di proprietà di blocco, e l'uso di variabili di condizione.
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 è non copiabile, ma è mobile. Il tipo di Mutex fornito l'esecuzione del concetto 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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Indice

[modifica] Membri tipi

Tipo
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Type
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Definition
mutex_type Mutex

[modifica] Membri funzioni

costruisce un unique_lock, eventualmente bloccare il mutex in dotazione
Original:
constructs a unique_lock, optionally locking the supplied mutex
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(membro pubblico funzione) [edit]
sblocca il mutex associato, se di proprietà
Original:
unlocks the associated mutex, if owned
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(membro pubblico funzione) [edit]
sblocca il mutex, se di proprietà, e acquista la proprietà di un altro
Original:
unlocks the mutex, if owned, and acquires ownership of another
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(membro pubblico funzione) [edit]
Bloccaggio
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Locking
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locks the associated mutex
(membro pubblico funzione) [edit]
prova a bloccare il mutex associato, restituisce se il mutex non è disponibile
Original:
tries to lock the associated mutex, returns if the mutex is not available
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(membro pubblico funzione) [edit]
i tentativi di bloccare il mutex associato TimedLockable, restituisce se il mutex non è stato disponibile per la durata di tempo specificato
Original:
attempts to lock the associated TimedLockable mutex, returns if the mutex has been unavailable for the specified time duration
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(membro pubblico funzione) [edit]
cerca di bloccare il mutex associato TimedLockable, restituisce se il mutex è stato disponibile fino al punto di tempo specificato è stato raggiunto
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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(membro pubblico funzione) [edit]
sblocca il mutex associato
Original:
unlocks the associated mutex
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(membro pubblico funzione) [edit]
Modificatori
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Modifiers
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swap di indicare con un altro std::unique_lock
Original:
swaps state with another std::unique_lock
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(membro pubblico funzione) [edit]
dissocia il mutex associato senza sbloccarlo
Original:
disassociates the associated mutex without unlocking it
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(membro pubblico funzione) [edit]
Osservatori
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Observers
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restituisce un puntatore al mutex associato
Original:
returns a pointer to the associated mutex
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(membro pubblico funzione) [edit]
verifica se il blocco possiede il suo mutex associato
Original:
tests whether the lock owns its associated mutex
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(membro pubblico funzione) [edit]
verifica se il blocco possiede il suo mutex associato
Original:
tests whether the lock owns its associated mutex
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(membro pubblico funzione) [edit]

[modifica] Non membri funzioni

specializzazione di std::swap per unique_lock
Original:
specialization of std::swap for unique_lock
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(funzione di modello) [edit]

[modifica] Esempio

#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();
}