Namespace
Varianti

std::mutex

Da cppreference.com.
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Discussione libreria di supporto
Threads
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Threads
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thread(C++11)
this_thread spazio dei nomi
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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)
Mutua esclusione
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Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Blocco di gestione generico
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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)
Condizioni variabili
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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)
 
std::mutex
Membri funzioni
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Member functions
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mutex::mutex
Bloccaggio
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Locking
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mutex::lock
mutex::try_lock
mutex::unlock
Maniglia nativo
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Native handle
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mutex::native_handle
 
Defined in header <mutex>
class mutex;
(dal C++11)
La classe mutex è una primitiva di sincronizzazione che può essere utilizzato per proteggere i dati condivisi vengano accedere contemporaneamente più thread.
Original:
The mutex class is a synchronization primitive that can be used to protect shared data from being simultaneously accessed by multiple threads.
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mutex offre esclusivi, non ricorsivi semantica di proprietà:
Original:
mutex offers exclusive, non-recursive ownership semantics:
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  • Un thread chiamante' possiede un mutex dal momento in cui lo chiama con successo sia lock o try_lock fino a quando non chiama unlock.
    Original:
    A calling thread owns a mutex from the time that it successfully calls either lock or try_lock until it calls unlock.
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  • Quando un thread possiede un mutex, tutti gli altri thread si blocca (per le chiamate verso lock) o ricevere un valore restituito false (per try_lock) se tentano di rivendicare la proprietà del mutex.
    Original:
    When a thread owns a mutex, all other threads will block (for calls to lock) or receive a false return value (for try_lock) if they attempt to claim ownership of the mutex.
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  • Un thread chiamante non deve possedere un mutex prima di chiamare lock o try_lock.
    Original:
    A calling thread must not own a mutex prior to calling lock or try_lock.
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Il comportamento di un programma non è definito se un mutex viene distrutto mentre ancora di proprietà di un po 'di filo. La classe mutex non è copiabile.
Original:
The behavior of a program is undefined if a mutex is destroyed while still owned by some thread. The mutex class is non-copyable.
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Indice

[modifica] Membri tipi

Membro tipo
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Member type
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Definition
native_handle_type
Implementazione definita
Original:
implementation-defined
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[modifica] Membri funzioni

costruisce il mutex
Original:
constructs the mutex
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(membro pubblico funzione) [edit]
Bloccaggio
Original:
Locking
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blocca i blocchi mutex, se il mutex non è disponibile
Original:
locks the mutex, blocks if the mutex is not available
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(membro pubblico funzione) [edit]
prova a bloccare il mutex, restituisce se il mutex non è disponibile
Original:
tries to lock the mutex, returns if the mutex is not available
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(membro pubblico funzione) [edit]
sblocca il mutex
Original:
unlocks the mutex
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(membro pubblico funzione) [edit]
Maniglia nativo
Original:
Native handle
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restituisce l'implementazione sottostante definito handle di thread
Original:
returns the underlying implementation-defined thread handle
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(membro pubblico funzione) [edit]

[modifica] Esempio

Questo esempio mostra come un mutex può essere utilizzata per proteggere un std::map condiviso tra due thread .
Original:
This example shows how a mutex can be used to protect a std::map shared between two threads.
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#include <iostream>
#include <chrono>
#include <thread>
#include <mutex>
#include <map>
#include <string>
 
std::map<std::string, std::string> g_pages;
std::mutex g_pages_mutex;
 
void save_page(const std::string &url)
{
    // simulate a long page fetch
    std::this_thread::sleep_for(std::chrono::seconds(2));
    std::string result = "fake content";
 
    g_pages_mutex.lock();
    g_pages[url] = result;
    g_pages_mutex.unlock();
}
 
int main() 
{
    std::thread t1(save_page, "http://foo");
    std::thread t2(save_page, "http://bar");
    t1.join();
    t2.join();
 
    g_pages_mutex.lock();
    for (const auto &pair : g_pages) {
        std::cout << pair.first << " => " << pair.second << '\n';
    }
    g_pages_mutex.unlock();
}

Output:

http://bar => fake content
http://foo => fake content