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std::launch

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Thema Support-Bibliothek
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)
Gegenseitigen Ausschluss
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Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Generische Sperrverwaltung
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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)
Zustand Variablen
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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)
 
Defined in header <future>
enum class launch : /* unspecified */ {

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

};
(seit C++11)
Gibt den Start-Richtlinie für eine Aufgabe von der std::async Funktion ausgeführt. std::launch ist ein BitmaskType (Aufzählung, integer oder 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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Die folgenden Konstanten bezeichnen einzelnen Bits werden von der Standard-Bibliothek definiert:
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The following constants denoting individual bits are defined by the standard library:
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Constant
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Constant
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Explanation
std::launch::async
ein neuer Thread gestartet, um die Aufgabe asynchron auszuführen
Original:
a new thread is launched to execute the task asynchronously
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std::launch::deferred
Die Aufgabe wird auf dem aufrufenden Thread zum ersten Mal das Ergebnis wird gebeten (lazy evaluation) ausgeführt
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the task is executed on the calling thread the first time its result is requested (lazy evaluation)
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Zusätzlich werden Implementierungen gelassen:
Original:
In addition, implementations are allowed to:
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  • definieren zusätzliche Bits und Bitmasken für Beschränkungen Aufgabe Wechselwirkungen anwendbar auf eine Untermenge von Politiken Start angeben, und
    Original:
    define additional bits and bitmasks to specify restrictions on task interactions applicable to a subset of launch policies, and
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  • ermöglichen diese zusätzlichen Bitmasken für die erste (default) Überlastung std::async .
    Original:
    enable those additional bitmasks for the first (default) overload of std::async.
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[Bearbeiten] Siehe auch

(C++11)
betreibt eine Funktion asynchron (möglicherweise in einem neuen Thread) und gibt einen std::future, die das Ergebnis halten wird
Original:
runs a function asynchronously (potentially in a new thread) and returns a std::future that will hold the result
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(Funktions-Template) [edit]