std::atomic_exchange, std::atomic_exchange_explicit

 

C++

Sprache

Concepts

Utilities-Bibliothek

Strings Bibliothek

Container-Bibliothek

Algorithmen-Bibliothek

Iteratoren Bibliothek

Numerik-Bibliothek

Input / Output-Bibliothek

Lokalisierungen Bibliothek

Reguläre Ausdrücke Bibliothek(C++11)

Atomare Operationen Bibliothek(C++11)

Thread Support-Bibliothek(C++11)

 

Atomare Operationen Bibliothek

Types Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

atomic (C++11)

atomic_is_lock_free (C++11)

Funktionen Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

atomic_store atomic_store_explicit (C++11) (C++11)

atomic_load atomic_load_explicit (C++11) (C++11)

atomic_exchange atomic_exchange_explicit (C++11) (C++11)

atomic_compare_exchange_weak atomic_compare_exchange_weak_explicit atomic_compare_exchange_strong atomic_compare_exchange_strong_explicit (C++11) (C++11) (C++11) (C++11)

atomic_fetch_add atomic_fetch_add_explicit (C++11) (C++11)

atomic_fetch_sub atomic_fetch_sub_explicit (C++11) (C++11)

atomic_fetch_and atomic_fetch_and_explicit (C++11) (C++11)

atomic_fetch_or atomic_fetch_or_explicit (C++11) (C++11)

atomic_fetch_xor atomic_fetch_xor_explicit (C++11) (C++11)

Atomic Fahnen Original: Atomic flags The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

atomic_flag (C++11)

atomic_flag_test_and_set atomic_flag_test_and_set_explicit (C++11) (C++11)

atomic_flag_clear atomic_flag_clear_explicit (C++11) (C++11)

Initialisierung Original: Initialization The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

atomic_init (C++11)

ATOMIC_VAR_INIT (C++11)

ATOMIC_FLAG_INIT (C++11)

Speicher Bestellung Original: Memory ordering The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

memory_order (C++11)

kill_dependency (C++11)

atomic_thread_fence (C++11)

atomic_signal_fence (C++11)

 

definiert in Header <atomic>
template<class T > T atomic_exchange(std::atomic<T>* obj, T desr );	(1)	(seit C++11)
template<class T > T atomic_exchange(volatilestd::atomic<T>* obj, T desr );	(2)	(seit C++11)
template<class T > T atomic_exchange_explicit(std::atomic<T>* obj, T desr,                             std::memory_order order );	(3)	(seit C++11)
template<class T > T atomic_exchange_explicit(volatilestd::atomic<T>* obj, T desr,                             std::memory_order order );	(4)	(seit C++11)

1-2)

Atomar ersetzt den Wert, auf den obj mit dem Wert der desr und gibt den Wert obj statt zuvor, als ob durch obj->exhange(desr)

Original:

Atomically replaces the value pointed to by obj with the value of desr and returns the value obj held previously, as if by obj->exhange(desr)

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

3-4)

Atomar ersetzt den Wert, auf den obj mit dem Wert der desr und gibt den Wert obj statt zuvor, als ob durch obj->exhange(desr, order)

Original:

Atomically replaces the value pointed to by obj with the value of desr and returns the value obj held previously, as if by obj->exhange(desr, order)

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Parameter

obj	-	Zeiger auf den atomaren Objekts zu ändern Original: pointer to the atomic object to modify The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
desr	-	der Wert auf im atomaren Objekt zu speichern Original: the value to store in the atomic object The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
order	-	der Speicher sycnhronization Bestellung für diesen Vorgang: Alle Werte sind zulässig . Original: the memory sycnhronization ordering for this operation: all values are permitted. The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Rückgabewert

Die zuvor von der atomaren Objekt gehalten, auf die obj

Original:

The value held previously by the atomic object pointed to by obj

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Ausnahmen

noexcept specification:  

noexcept

  (seit C++11)

Beispiel

Ein Spinlock Mutex kann im Userspace mit einem atomaren Austausch Betrieb, ähnlich atomic_flag_test_and_set umgesetzt werden

Original:

A spinlock mutex can be implemented in userspace using an atomic exchange operation, similar to atomic_flag_test_and_set

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

#include <thread>#include <vector>#include <iostream>#include <atomic>   std::atomic<bool> lock =ATOMIC_VAR_INIT(false);   void f(int n){for(int cnt =0; cnt <100;++cnt){while(std::atomic_exchange_explicit(&lock, true, std::memory_order_acquire));// spin until acquiredstd::cout<<"Output from thread "<< n <<'\n';std::atomic_store_explicit(&lock, false, std::memory_order_release);}}int main(){std::vector<std::thread> v;for(int n =0; n <10;++n){ v.emplace_back(f, n);}for(auto& t : v){ t.join();}}

Output:

Output from thread 2 Output from thread 6 Output from thread 7 ...<exactly 1000 lines>...

Siehe auch

exchange (C++11)	atomar ersetzt den Wert des atomaren Objekt und erhält den Wert zuvor gehaltenen Original: atomically replaced the value of the atomic object and obtains the value held previously The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of std::atomic)
atomic_compare_exchange_weak atomic_compare_exchange_weak_explicit atomic_compare_exchange_strong atomic_compare_exchange_strong_explicit (C++11) (C++11) (C++11) (C++11)	atomar vergleicht den Wert des atomaren Objekt mit nicht-elementare Argument und führt atomaren Austausch wenn gleiche oder atomare Last, wenn nicht Original: atomically compares the value of the atomic object with non-atomic argument and performs atomic exchange if equal or atomic load if not The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktions-Template)
std::atomic_exchange(std::shared_ptr) std::atomic_exchange_explicit(std::shared_ptr)	spezialisiert atomare Operationen für std::shared_ptr Original: specializes atomic operations for std::shared_ptr The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktions-Template)
C documentation for atomic_exchange, atomic_exchange_explicit