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std::mutex::lock

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< cpp‎ | thread‎ | mutex

 
 
Bibliothèque de support fil
Threads
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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)
 
std::mutex
Les fonctions membres
Original:
Member functions
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mutex::mutex
Verrouiller
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Locking
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mutex::lock
mutex::try_lock
mutex::unlock
Handle natif
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Native handle
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mutex::native_handle
 
void lock();
(depuis C++11)
Verrouille le mutex. Si un autre thread a déjà verrouillé le mutex, un appel à lock bloque l'exécution jusqu'à ce que le verrou est acquis .
Original:
Locks the mutex. If another thread has already locked the mutex, a call to lock will block execution until the lock is acquired.
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Sommaire

[modifier] Paramètres

(Aucun)
Original:
(none)
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[modifier] Retourne la valeur

(Aucun)
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(none)
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[modifier] Exceptions

std::system_error jette quand des erreurs se produisent, y compris les erreurs du système d'exploitation sous-jacent qui empêcheraient lock de respecter ses spécifications .
Original:
Throws std::system_error when errors occur, including errors from the underlying operating system that would prevent lock from meeting its specifications.
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Note

A program may deadlock if a thread that already owns a mutex calls lock on that mutex. Alternatively, if an implementation can detect the deadlock, a resource_deadlock_would_occur error condition may be observed.

[modifier] Exemple

Cet exemple montre comment lock et unlock peut être utilisé pour protéger les données partagées .
Original:
This example shows how lock and unlock can be used to protect shared data.
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#include <iostream>
#include <chrono>
#include <thread>
#include <mutex>
 
int g_num = 0;  // protected by g_num_mutex
std::mutex g_num_mutex;
 
void slow_increment(int id) 
{
  for (int i = 0; i < 3; ++i) {
    g_num_mutex.lock();
    ++g_num;
    std::cout << id << " => " << g_num << '\n';
    g_num_mutex.unlock();
 
    std::this_thread::sleep_for(std::chrono::seconds(1));
  }
}
 
int main()
{
  std::thread t1(slow_increment, 0);
  std::thread t2(slow_increment, 1);
  t1.join();
  t2.join();
}

Résultat possible :

0 => 1
1 => 2
0 => 3
1 => 4
0 => 5
1 => 6

[modifier] Voir aussi

essaie de verrouiller le mutex, retourne si le mutex n'est pas disponible
Original:
tries to lock the mutex, returns if the mutex is not available
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(fonction membre publique) [edit]
déverrouille le mutex
Original:
unlocks the mutex
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(fonction membre publique) [edit]