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std::atomic_flag

De cppreference.com
< cpp‎ | atomic

 
 
Atomique opérations de la bibliothèque
Types
Original:
Types
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atomic (C++11)
atomic_is_lock_free (C++11)
Fonctions
Original:
Functions
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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)
Drapeaux atomiques
Original:
Atomic flags
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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)
Initialisation
Original:
Initialization
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atomic_init (C++11)
ATOMIC_VAR_INIT (C++11)
ATOMIC_FLAG_INIT (C++11)
Mémoire de la commande
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Memory ordering
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memory_order (C++11)
kill_dependency (C++11)
atomic_thread_fence (C++11)
atomic_signal_fence (C++11)
 
std::atomic_flag
Les fonctions membres
Original:
Member functions
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atomic_flag::atomic_flag
atomic_flag::operator=
atomic_flag::clear
atomic_flag::test_and_set
 
Defined in header <atomic>
class atomic_flag;
(depuis C++11)
std::atomic_flag est un type atomique booléen. Contrairement à toutes les spécialisations de std::atomic, il est garanti d'être sans verrou. Contrairement std::atomic<bool>, std::atomic_flag ne fournit pas de charge ou de l'exploitation des magasins .
Original:
std::atomic_flag is an atomic boolean type. Unlike all specializations of std::atomic, it is guaranteed to be lock-free. Unlike std::atomic<bool>, std::atomic_flag does not provide load or store operations.
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[modifier] Fonctions membres

construit un atomic_flag
Original:
constructs an atomic_flag
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(fonction membre publique)
l'opérateur d'affectation
Original:
the assignment operator
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(fonction membre publique)
définit de manière atomique drapeau pour false
Original:
atomically sets flag to false
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(fonction membre publique) [edit]
définit de manière atomique le drapeau pour true et obtient sa valeur précédente
Original:
atomically sets the flag to true and obtains its previous value
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(fonction membre publique) [edit]

[modifier] Exemple

Un mutex spinlock peut être mis en œuvre dans l'espace utilisateur en utilisant un atomic_flag
Original:
A spinlock mutex can be implemented in userspace using an atomic_flag
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#include <thread>
#include <vector>
#include <iostream>
#include <atomic>
 
std::atomic_flag lock = ATOMIC_FLAG_INIT;
 
void f(int n)
{
    for(int cnt = 0; cnt < 100; ++cnt) {
        while(lock.test_and_set(std::memory_order_acquire))  // acquire lock
             ; // spin
        std::cout << "Output from thread " << n << '\n';
        lock.clear(std::memory_order_release);               // release lock
    }
}
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();
    }
}

Résultat :

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

[modifier] Voir aussi

définit de manière atomique le drapeau pour true et renvoie sa valeur précédente
Original:
atomically sets the flag to true and returns its previous value
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(fonction) [edit]
définit atomiquement la valeur de l'indicateur de false
Original:
atomically sets the value of the flag to false
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(fonction) [edit]
initialise un std::atomic_flag à false
Original:
initializes an std::atomic_flag to false
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(constante macro) [edit]
C documentation for atomic_flag