Espaces de noms
Variantes

    std::lock

    De cppreference.com
    See More

    This page has been machine-translated from the English version of the wiki using Google Translate.

    The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here.

    Click here for the English version of this page

    <metanoindex/>

     
    C++
     
    Bibliothèque de support fil
    Threads
    Original:
    Threads
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    thread (C++11)
    this_thread espace de noms
    Original:
    this_thread namespace
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    get_id (C++11)
    yield (C++11)
    sleep_for (C++11)
    sleep_until (C++11)
    L'exclusion mutuelle
    Original:
    Mutual exclusion
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    mutex (C++11)
    timed_mutex (C++11)
    Gestion du verrouillage générique
    Original:
    Generic lock management
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    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
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    condition_variable (C++11)
    condition_variable_any (C++11)
    notify_all_at_thread_exit (C++11)
    cv_status (C++11)
    Futures
    Original:
    Futures
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    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)
     
    <tbody> </tbody>
    Déclaré dans l'en-tête <mutex>
    template< class Lockable1, class Lockable2, class LockableN... > void lock( Lockable1& lock1, Lockable2& lock2, LockableN& lockn... );
    		 (depuis C++11)
    Verrouille la donnée Lockable objets lock1, lock2, ..., lockn l'aide d'un algorithme d'évitement de blocage pour éviter une impasse .
    Original:
    Locks the given Lockable objects lock1, lock2, ..., lockn using a deadlock avoidance algorithm to avoid deadlock.
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Les objets sont verrouillés par une série indéterminée d'appels à lock, try_lock, unlock. Si un appel à lock ou unlock entraîne une exception, unlock est appelée pour tous les objets verrouillés avant rethrowing .
    Original:
    The objects are locked by an unspecified series of calls to lock, try_lock, unlock. If a call to lock or unlock results in an exception, unlock is called for any locked objects before rethrowing.
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.

    Paramètres

    lock1, lock2, ... , lockn -
    l'Lockable objets à verrouiller
    Original:
    the Lockable objects to lock
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.

    Retourne la valeur

    (Aucun)
    Original:
    (none)
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.

    Exemple

    L'exemple suivant utilise std::lock pour verrouiller paires de mutex sans impasse .
    Original:
    The following example uses std::lock to lock pairs of mutexes without deadlock.
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.

    #include <mutex>
#include <thread>
#include <iostream>
#include <vector>
#include <functional>
#include <chrono>

struct Employee {
    Employee(int id) : id(id) {}
    int id;
    std::vector<int> lunch_partners;
    std::mutex m;
};

void send_mail(Employee &e1, Employee &e2)
{
    // simulate a time-consuming messaging operation
    std::this_thread::sleep_for(std::chrono::seconds(1));
}

void assign_lunch_partner(Employee &e1, Employee &e2)
{
    // use std::lock to acquire two locks without worrying about 
    // other calls to assign_lunch_partner deadlocking us
    std::lock(e1.m, e2.m);

    e1.lunch_partners.push_back(e2.id);
    e2.lunch_partners.push_back(e1.id);

    e1.m.unlock();
    e2.m.unlock();

    send_mail(e1, e2);
    send_mail(e2, e1);
}

int main()
{
    Employee alice(0), bob(1), christina(2), dave(3);

    // assign in parallel threads because mailing users about lunch assignments
    // takes a long time
    std::vector<std::thread> threads;
    threads.emplace_back(assign_lunch_partner, std::ref(alice), std::ref(bob));
    threads.emplace_back(assign_lunch_partner, std::ref(christina), std::ref(bob));
    threads.emplace_back(assign_lunch_partner, std::ref(christina), std::ref(alice));
    threads.emplace_back(assign_lunch_partner, std::ref(dave), std::ref(bob));

    for (auto &thread : threads) thread.join();
}


    Voir aussi

    (C++11)
    tente d'obtenir la propriété des mutex via des appels répétés à try_lock
    Original:
    attempts to obtain ownership of mutexes via repeated calls to try_lock
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.

    (fonction générique) [edit]