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std::launch

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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)
Futuros
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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)
 
Defined in header <future>
enum class launch : /* unspecified */ {

    async =    /* unspecified */,
    deferred = /* unspecified */,
    /* implementation-defined */

};
(a partir do C++ 11)
Especifica a política de lançamento de uma tarefa executada pela função std::async. std::launch é um BitmaskType (inteiro enumeração, ou bitset).
Original:
Specifies the launch policy for a task executed by the std::async function. std::launch is a BitmaskType (enumeration, integer, or bitset).
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As seguintes constantes denotando bits individuais são definidas pela biblioteca padrão:
Original:
The following constants denoting individual bits are defined by the standard library:
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Constante
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Constant
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Explanation
std::launch::async
um novo segmento é lançado para executar a tarefa de forma assíncrona
Original:
a new thread is launched to execute the task asynchronously
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std::launch::deferred
a tarefa é executada no segmento chamado pela primeira vez o seu resultado é solicitado (avaliação preguiçosa)
Original:
the task is executed on the calling thread the first time its result is requested (lazy evaluation)
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Além disso, as implementações estão autorizados a:
Original:
In addition, implementations are allowed to:
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  • definir bits adicionais e bitmasks para especificar restrições nas interações tarefas aplicáveis ​​a um subconjunto de políticas de lançamento, e
    Original:
    define additional bits and bitmasks to specify restrictions on task interactions applicable to a subset of launch policies, and
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  • permitir a esses bitmasks adicionais para a sobrecarga (padrão) antes de std::async.
    Original:
    enable those additional bitmasks for the first (default) overload of std::async.
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[editar] Veja também

(C++11)
executa uma função de forma assíncrona (potencialmente em um novo segmento) e retorna uma std::future que vai segurar o resultado
Original:
runs a function asynchronously (potentially in a new thread) and returns a std::future that will hold the result
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(modelo de função) [edit]