Varianti

    std::condition_variable::wait_for

    Da cppreference.com.

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    <metanoindex/>

     
    C++
     
    Discussione libreria di supporto
    Threads
    Original:
    Threads
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    thread(C++11)
    this_thread spazio dei nomi
    Original:
    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::condition_variable
    Membri funzioni
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    Member functions
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    condition_variable::condition_variable
    condition_variable::~condition_variable
    Notifica
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    Notification
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    condition_variable::notify_one
    condition_variable::notify_all
    In attesa
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    Waiting
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    condition_variable::wait
    condition_variable::wait_for
    condition_variable::wait_until
    Maniglia nativo
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    Native handle
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    condition_variable::native handle
     
    <tbody> </tbody>
    template< class Rep, class Period > std::cv_status wait_for( std::unique_lock<std::mutex>& lock, const std::chrono::duration<Rep, Period>& rel_time);
    		 (1) (dal C++11)
    template< class Rep, class Period, class Predicate > bool wait_for( std::unique_lock<std::mutex>& lock, const std::chrono::duration<Rep, Period>& rel_time, Predicate pred);
    		 (2) (dal C++11)

    1)

    Rilascia atomico lock, blocca il thread corrente di esecuzione, e lo aggiunge alla lista di thread in attesa su *this. Il filo sarà sbloccato quando notify_all() o notify_one() viene eseguito, o quando il timeout rel_time relativa scadenza. Essa può anche essere sbloccato spurio. Quando sbloccato, indipendentemente dal motivo, lock è riacquisito ed esce wait_for(). Se questa funzione termina via eccezionale, lock anche riacquistata.
    Original:
    Atomically releases lock, blocks the current executing thread, and adds it to the list of threads waiting on *this. The thread will be unblocked when notify_all() or notify_one() is executed, or when the relative timeout rel_time expires. It may also be unblocked spuriously. When unblocked, regardless of the reason, lock is reacquired and wait_for() exits. If this function exits via exception, lock is also reacquired.
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    2)

    Equivalente a
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    Equivalent to
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    while (!pred()) if (wait_for(lock, rel_time) == std::cv_status::timeout) return pred(); return true;

    Questo sovraccarico può essere utilizzato per ignorare risvegli spurie.
    Original:
    This overload may be used to ignore spurious awakenings.
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    Parametri

    lock -
    un oggetto di std::unique_lock<std::mutex> tipo, che deve essere bloccato dal thread corrente
    Original:
    an object of type std::unique_lock<std::mutex>, which must be locked by the current thread
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    rel_time -
    un oggetto di std::chrono::duration tipo che rappresenta il tempo massimo di attesa di spendere
    Original:
    an object of type std::chrono::duration representing the maximum time to spend waiting
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    pred - predicate which returns ​false
    se l'attesa deve essere continuato