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    std::mutex::try_lock

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    <metanoindex/>

     
    C++
     
    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)
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    L'exclusion mutuelle
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    Mutual exclusion
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    mutex (C++11)
    timed_mutex (C++11)
    Gestion du verrouillage générique
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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)
    Les variables de condition
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    Condition variables
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    std::mutex
    Les fonctions membres
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    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
     
    <tbody> </tbody>
    bool try_lock();
    		 (depuis C++11)
    Essaie de verrouiller le mutex. Retourne immédiatement. Le succès revient d'acquisition de verrouillage true, sinon retourne false .
    Original:
    Tries to lock the mutex. Returns immediately. On successful lock acquisition returns true, otherwise returns false.
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    Paramètres

    (Aucun)
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    (none)
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    Retourne la valeur

    true si le verrou a été acquis avec succès, sinon false .
    Original:
    true if the lock was acquired successfully, otherwise false.
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    Exceptions

    This section is incomplete

    Exemple

    Cet exemple montre serrure, try_lock et déverrouiller en action
    Original:
    This example shows lock, try_lock and unlock in action
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    #include <iostream>
#include <mutex>
	
int main()
{
    std::mutex test;
    if (test.try_lock()==true)
        std::cout << "lock acquired" << std::endl;
    else
        std::cout << "lock not acquired" << std::endl;
    test.unlock();	//now unlock the mutex
    test.lock();	//to lock it again
    if (test.try_lock())  //true can be left out
        std::cout << "lock acquired" << std::endl;
    else
        std::cout << "lock not acquired" << std::endl;
    test.lock(); //and now the finale (a block)
}

    Résultat : 

    lock acquired
lock not acquired
(program hangs)

    Voir aussi

    		 verrouille le mutex, bloque si le mutex n'est pas disponible
    (fonction membre publique) [edit]
    déverrouille le mutex
    Original:
    unlocks the mutex
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    (fonction membre publique) [edit]