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std::thread::thread

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< cpp‎ | thread‎ | thread


 
 
Bibliothèque de support fil
Threads
Original:
Threads
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thread (C++11)
this_thread espace de noms
Original:
this_thread namespace
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get_id (C++11)
yield (C++11)
sleep_for (C++11)
sleep_until (C++11)
L'exclusion mutuelle
Original:
Mutual exclusion
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mutex (C++11)
timed_mutex (C++11)
Gestion du verrouillage générique
Original:
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)
Les variables de condition
Original:
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
Original:
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::thread
Classes de membres
Original:
Member classes
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thread::id
Les fonctions membres
Original:
Member functions
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thread::thread
thread::~thread
thread::operator=
Des observateurs
Original:
Observers
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thread::joinable
thread::get_id
thread::native_handle
thread::hardware_concurrency
Opérations
Original:
Operations
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thread::join
thread::detach
thread::swap
Tiers fonctions
Original:
Non-member functions
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std::swap
 
thread();
(1) (depuis C++11)
thread( thread&& other );
(2) (depuis C++11)
template< class Function, class... Args >
explicit thread( Function&& f, Args&&... args );
(3) (depuis C++11)
thread(const thread&) = delete;
(4) (depuis C++11)
Construit objet nouveau thread .
Original:
Constructs new thread object.
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1)
Crée un objet nouveau thread qui ne représente pas un fil .
Original:
Creates new thread object which does not represent a thread.
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2)
Déplacez constructeur. Construit l'objet thread pour représenter le thread d'exécution qui a été représenté par other. Après cet appel other ne représente plus un thread d'exécution .
Original:
Move constructor. Constructs the thread object to represent the thread of execution that was represented by other. After this call other no longer represents a thread of execution.
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3)
Crée un nouveau std::thread objet et l'associe à un thread d'exécution. D'abord le constructeur de copie toutes args... arguments pour stockage local des threads comme par la fonction:
Original:
Creates new std::thread object and associates it with a thread of execution. First the constructor copies all arguments args... to thread-local storage as if by the function:
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template <class T>
typename decay<T>::type decay_copy(T&& v) {
    return std::forward<T>(v);
}
@ @ Toutes les exceptions levées lors de l'évaluation et de la copie des arguments sont jetés dans le thread en cours, et non pas le nouveau thread .
Original:
@@ Any exceptions thrown during evaluation and copying of the arguments are thrown in the current thread, not the new thread.
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@ @ Le code qui sera exécuté dans le nouveau thread est défini comme suit.
Nous allons consulter Nonecopied_args comme t1, t2, ..., tN, où N est
sizeof...(copied_args)and copied_args is the result of calling decay_copy as defined above. The following code will be run in the new thread:
Original:
Let's refer to Nonecopied_args as t1, t2, ..., tN, where N is sizeof...(copied_args)and copied_args is the result of calling decay_copy as defined above. The following code will be run in the new thread:
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  • Si f est un pointeur vers une fonction membre de la classe T, il est alors appelé. La valeur de retour est ignorée. En effet, le code suivant est exécuté:
    Original:
    If f is pointer to a member function of class T, then it is called. The return value is ignored. Effectively, the following code is executed:
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  • (t1.*f)(t2, ..., tN) si le type de t1 est soit T, la référence à T ou de référence à taper dérivé de T .
    Original:
    (t1.*f)(t2, ..., tN) if the type of t1 is either T, reference to T or reference to type derived from T.
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  • ((*t1).*f)(t2, ..., tN) autrement .
    Original:
    ((*t1).*f)(t2, ..., tN) otherwise.
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  • Si N == 1 et f est pointeur vers un objet membre de données d'une classe, il est alors accessible. La valeur de l'objet est ignoré. En effet, le code suivant est exécuté:
    Original:
    If N == 1 and f is pointer to a member data object of a class, then it is accessed. The value of the object is ignored. Effectively, the following code is executed:
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  • Si t1.*f et du type de t1 est soit T, ou référence à T référence au type dérivé de T .
    Original:
    t1.*f if and the type of t1 is either T, reference to T or reference to type derived from T.
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  • (*t1).*f autrement .
    Original:
    (*t1).*f otherwise.
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  • f est appelé comme un pointeur vers une fonction non-membre dans les autres cas. La valeur de retour est ignorée. En effet, f(t1, t2, ..., tN) est exécuté .
    Original:
    f is called as a pointer to a non-member function in all other cases. The return value is ignored. Effectively, f(t1, t2, ..., tN) is executed.
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Original:
@@ The code that will be run in the new thread is defined as follows.
Nous allons consulter Nonecopied_args comme t1, t2, ..., tN, où N est
sizeof...(copied_args)and copied_args is the result of calling decay_copy as defined above. The following code will be run in the new thread:
Original:
Let's refer to Nonecopied_args as t1, t2, ..., tN, where N is sizeof...(copied_args)and copied_args is the result of calling decay_copy as defined above. The following code will be run in the new thread:
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  • Si f est un pointeur vers une fonction membre de la classe T, il est alors appelé. La valeur de retour est ignorée. En effet, le code suivant est exécuté:
    Original:
    If f is pointer to a member function of class T, then it is called. The return value is ignored. Effectively, the following code is executed:
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  • (t1.*f)(t2, ..., tN) si le type de t1 est soit T, la référence à T ou de référence à taper dérivé de T .
    Original:
    (t1.*f)(t2, ..., tN) if the type of t1 is either T, reference to T or reference to type derived from T.
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  • ((*t1).*f)(t2, ..., tN) autrement .
    Original:
    ((*t1).*f)(t2, ..., tN) otherwise.
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  • Si N == 1 et f est pointeur vers un objet membre de données d'une classe, il est alors accessible. La valeur de l'objet est ignoré. En effet, le code suivant est exécuté:
    Original:
    If N == 1 and f is pointer to a member data object of a class, then it is accessed. The value of the object is ignored. Effectively, the following code is executed:
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  • Si t1.*f et du type de t1 est soit T, ou référence à T référence au type dérivé de T .
    Original:
    t1.*f if and the type of t1 is either T, reference to T or reference to type derived from T.
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  • (*t1).*f autrement .
    Original:
    (*t1).*f otherwise.
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  • f est appelé comme un pointeur vers une fonction non-membre dans les autres cas. La valeur de retour est ignorée. En effet, f(t1, t2, ..., tN) est exécuté .
    Original:
    f is called as a pointer to a non-member function in all other cases. The return value is ignored. Effectively, f(t1, t2, ..., tN) is executed.
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4)
Le constructeur de copie est supprimée; fils ne sont pas copiable. Il n'ya pas deux std::thread objets peuvent représenter le même thread d'exécution .
Original:
The copy constructor is deleted; threads are not copyable. No two std::thread objects may represent the same thread of execution.
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Sommaire

[modifier] Paramètres

other -
un autre objet thread pour construire cet objet thread avec
Original:
another thread object to construct this thread object with
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f -
fonctionner à exécuter dans le nouveau thread
Original:
function to execute in the new thread
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args... -
arguments à passer à la nouvelle fonction
Original:
arguments to pass to the new function
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[modifier] Exceptions

1-2)
noexcept specification:  
noexcept
   (depuis C++11)
3)
std::system_error si le thread n'a pas pu être démarré. L'exception peut représenter le std::errc::resource_unavailable_try_again condition d'erreur ou d'une autre condition d'erreur spécifique à l'implémentation .
Original:
std::system_error if the thread could not be started. The exception may represent the error condition std::errc::resource_unavailable_try_again or another implementation-specific error condition.
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[modifier] Notes

Les arguments de la fonction de thread sont copiées par valeur. Si un argument de référence doit être passé à la fonction de thread, il doit être enveloppé (par exemple avec std::ref ou std::cref) .
Original:
The arguments to the thread function are copied by value. If a reference argument needs to be passed to the thread function, it has to be wrapped (e.g. with std::ref or std::cref).
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Toute valeur de retour de la fonction est ignorée. Si la fonction lève une exception, std::terminate est appelée. Afin de passer des valeurs de retour ou des exceptions au thread, appelez ou std::promise std::async peut être utilisé .
Original:
Any return value from the function is ignored. If the function throws an exception, std::terminate is called. In order to pass return values or exceptions back to the calling thread, std::promise or std::async may be used.
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[modifier] Exemple

#include <iostream>
#include <utility>
#include <thread>
#include <chrono>
#include <functional>
#include <atomic>
 
void f1(int n)
{
    for(int i=0; i<5; ++i) {
        std::cout << "Thread " << n << " executing\n";
        std::this_thread::sleep_for(std::chrono::milliseconds(10));
    }
}
 
void f2(int& n)
{
    for(int i=0; i<5; ++i) {
        std::cout << "Thread 2 executing\n";
        ++n;
        std::this_thread::sleep_for(std::chrono::milliseconds(10));
    }
}
 
int main()
{
    int n = 0;
    std::thread t1; // t1 is not a thread
    std::thread t2(f1, n+1); // pass by value
    std::thread t3(f2, std::ref(n)); // pass by reference
    std::thread t4(std::move(t3)); // t4 is now running f2(). t3 is no longer a thread
    t2.join();
    t4.join();
    std::cout << "Final value of n is " << n << '\n';
}

Résultat possible :

Thread 1 executing
Thread 2 executing
Thread 1 executing
Thread 2 executing
Thread 1 executing
Thread 2 executing
Thread 1 executing
Thread 2 executing
Thread 1 executing
Thread 2 executing
Final value of n is 5