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std::lock

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Bibliothèque de support fil
Threads
Original:
Threads
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thread (C++11)
this_thread espace de noms
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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)
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
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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)
 
Defined in header <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.
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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.
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Sommaire

[modifier] Paramètres

lock1, lock2, ... , lockn -
l'Lockable objets à verrouiller
Original:
the Lockable objects to lock
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[modifier] Retourne la valeur

(Aucun)
Original:
(none)
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[modifier] 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.
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#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();
}


[modifier] 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
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(fonction générique) [edit]