Namespace
Varianti

std::thread::thread

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< cpp‎ | thread‎ | thread


 
 
Discussione libreria di supporto
Threads
Original:
Threads
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thread(C++11)
this_thread spazio dei nomi
Original:
this_thread namespace
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get_id(C++11)
yield(C++11)
sleep_for(C++11)
sleep_until(C++11)
Mutua esclusione
Original:
Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Blocco di gestione generico
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)
Condizioni variabili
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
Membri classi
Original:
Member classes
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thread::id
Membri funzioni
Original:
Member functions
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thread::thread
thread::~thread
thread::operator=
Osservatori
Original:
Observers
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thread::joinable
thread::get_id
thread::native_handle
thread::hardware_concurrency
Operazioni
Original:
Operations
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thread::join
thread::detach
thread::swap
Non membri funzioni
Original:
Non-member functions
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std::swap
 
thread();
(1) (dal C++11)
thread( thread&& other );
(2) (dal C++11)
template< class Function, class... Args >
explicit thread( Function&& f, Args&&... args );
(3) (dal C++11)
thread(const thread&) = delete;
(4) (dal C++11)
Costruisce oggetto nuova discussione.
Original:
Constructs new thread object.
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1)
Crea nuovo oggetto thread che non rappresenta un filo.
Original:
Creates new thread object which does not represent a thread.
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2)
Sposta costruttore. Costruisce l'oggetto thread per rappresentare il thread di esecuzione che è stata rappresentata da other. Dopo questa chiamata other non rappresenta più un thread di esecuzione.
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)
Crea nuovo std::thread oggetto e lo associa un thread di esecuzione. In primo luogo il costruttore copia tutti args... argomenti per thread-local storage come se per la funzione:
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);
}
@ @ Tutte le eccezioni generate durante la valutazione e la copia degli argomenti vengono gettati nel thread corrente non, il nuovo 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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@ @ Il codice che verrà eseguito nel nuovo thread è definito come segue. Facciamo riferimento al Nonecopied_args come t1, t2,..., tN, dove N è
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:
  • Se f è puntatore a una funzione membro della classe T, allora si chiama. Il valore restituito viene ignorato. In effetti, il codice riportato di seguito viene eseguito:
    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) se il tipo di t1 è o T, il riferimento a T o riferimenti alle tipo derivato da 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) altrimenti.
    Original:
    ((*t1).*f)(t2, ..., tN) otherwise.
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  • Se N == 1 e f è puntatore a un oggetto membro dati di una classe, quindi vi si accede. Il valore dell'oggetto viene ignorato. In effetti, il codice riportato di seguito viene eseguito:
    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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  • t1.*f se e il tipo di t1 è o T, riferimento alla T o riferimento tipo derivato da 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 altrimenti.
    Original:
    (*t1).*f otherwise.
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  • f si chiama come un puntatore a una funzione non membro in tutti gli altri casi. Il valore restituito viene ignorato. In effetti, f(t1, t2, ..., tN) viene eseguito.
    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. Facciamo riferimento al Nonecopied_args come t1, t2,..., tN, dove N è
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:
  • Se f è puntatore a una funzione membro della classe T, allora si chiama. Il valore restituito viene ignorato. In effetti, il codice riportato di seguito viene eseguito:
    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) se il tipo di t1 è o T, il riferimento a T o riferimenti alle tipo derivato da 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) altrimenti.
    Original:
    ((*t1).*f)(t2, ..., tN) otherwise.
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  • Se N == 1 e f è puntatore a un oggetto membro dati di una classe, quindi vi si accede. Il valore dell'oggetto viene ignorato. In effetti, il codice riportato di seguito viene eseguito:
    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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  • t1.*f se e il tipo di t1 è o T, riferimento alla T o riferimento tipo derivato da 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 altrimenti.
    Original:
    (*t1).*f otherwise.
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  • f si chiama come un puntatore a una funzione non membro in tutti gli altri casi. Il valore restituito viene ignorato. In effetti, f(t1, t2, ..., tN) viene eseguito.
    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)
Il costruttore di copia, è soppresso il thread non sono copiabili. Non ci sono due std::thread oggetti possono rappresentare lo stesso thread di esecuzione.
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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Indice

[modifica] Parametri

other -
un altro oggetto thread per costruire questo oggetto filo con
Original:
another thread object to construct this thread object with
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f -
funzione da eseguire nel nuovo thread
Original:
function to execute in the new thread
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args... -
argomenti da passare alla nuova funzione
Original:
arguments to pass to the new function
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[modifica] Eccezioni

1-2)
noexcept specification:  
noexcept
  (dal C++11)
3)
std::system_error se il thread non può essere avviato. L'eccezione può rappresentare il std::errc::resource_unavailable_try_again condizione di errore o un'altra implementazione specifica condizione di errore.
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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[modifica] Note

Gli argomenti della funzione di thread vengono copiati per valore. Se un argomento di riferimento deve essere passato alla funzione thread, deve essere avvolto (ad esempio con std::ref o 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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Qualsiasi valore restituito dalla funzione viene ignorata. Se la funzione genera un'eccezione, std::terminate si chiama. Per superare i valori di ritorno o eccezioni nuovo al thread chiamante, std::promise o std::async può essere utilizzato.
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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[modifica] Esempio

#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';
}

Possible output:

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