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      std::condition_variable

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      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)
      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
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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
      Original:
      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::condition_variable
      Les fonctions membres
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      Member functions
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      condition_variable::condition_variable
      condition_variable::~condition_variable
      Notification
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      Notification
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      condition_variable::notify_one
      condition_variable::notify_all
      D'attente
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      Waiting
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      condition_variable::wait
      condition_variable::wait_for
      condition_variable::wait_until
      Handle natif
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      Native handle
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      condition_variable::native handle
       
      Déclaré dans l'en-tête <condition_variable>
      class condition_variable;
      		 (depuis C++11)
      La classe condition_variable est une primitive de synchronisation qui peut être utilisée pour bloquer un ou plusieurs threads en même temps, jusqu'à ce que:
      Original:
      The condition_variable class is a synchronization primitive that can be used to block a thread, or multiple threads at the same time, until:
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      • une notification soit reçue d'un autre thread
        Original:
        a notification is received from another thread
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      • un délai expire, ou
        Original:
        a timeout expires, or
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      • un faux réveil se produise
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        a réveil faux occurs
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      Tout thread qui veut attendre une std::condition_variable doit d'abord acquérir un std::unique_lock. Les opérations d'attente (wait) libèrent atomiquement le mutex et suspendent l'exécution du thread appelant. Lorsque la notification de la condition_variable (notify) intervient, le thread en attente est réveillé, et le mutex lui est acquis de nouveau.
      Original:
      Any thread that intends to wait on std::condition_variable has to acquire a std::unique_lock first. The wait operations atomically release the mutex and suspend the execution of the thread. When the condition variable is notified, the thread is awakened, and the mutex is reacquired.
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      La classe
      std::condition_variable est de type StandardLayoutType. Elle n'est pas CopyConstructible, MoveConstructible, CopyAssignable, MoveAssignable .
      Original:
      The class std::condition_variable is a StandardLayoutType. It is not CopyConstructible, MoveConstructible, CopyAssignable, MoveAssignable.
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      Sommaire

      [modifier]Types de membres

      Type du membre Définition
      native_handle_type
      ' Définie par l'implémentation
      Original:
      implementation-defined
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      [modifier]Fonctions membres

      Construit l'objet
      Original:
      constructs the object
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      (fonction membre publique)[edit]
      Détruit l'objet
      Original:
      destructs the object
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      (fonction membre publique)[edit]
      operator=
      [
      supprimée
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      deleted
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      ]
      pas de copier-cessible
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      not copy-assignable
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      (fonction membre publique)[edit]
      Notification
      Original:
      Notification
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      Notifie un thread en attente
      Original:
      notifies one waiting thread
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      (fonction membre publique)[edit]
      Notifie tous les threads en attente
      Original:
      notifies all waiting threads
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      (fonction membre publique)[edit]
      Attente
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      Waiting
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      Bloque le thread actuel jusqu'à ce que la condition_variable soit réveillée
      Original:
      blocks the current thread until the condition variable is woken up
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      (fonction membre publique)[edit]
      Bloque le thread actuel jusqu'à ce que la condition_variable soit réveillée ou que la durée de temporisation spécifiée soit écoulée
      Original:
      blocks the current thread until the condition variable is woken up or after the specified timeout duration
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      (fonction membre publique)[edit]
      Bloque le thread en cours jusqu'à ce que la condition_variable soit réveillée ou jusqu'à ce que le point temporel (time point) spécifié soit atteint
      Original:
      blocks the current thread until the condition variable is woken up or until specified time point has been reached
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      (fonction membre publique)[edit]
      Handle natif
      Original:
      Native handle
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      Retourne le handle natif sous-jacent
      Original:
      returns the native handle
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      (fonction membre publique)[edit]

      [modifier]Exemple

      #include <condition_variable>#include <mutex>#include <thread>#include <iostream>#include <queue>#include <chrono>   int main(){std::queue<int> produced_nums;std::mutex m; std::condition_variable cond_var;bool done =false;bool notified =false;   std::thread producer([&](){for(int i =0; i <5;++i){std::this_thread::sleep_for(std::chrono::seconds(1));std::unique_lock<std::mutex> lock(m);std::cout<<"producing "<< i <<'\n'; produced_nums.push(i); notified =true; cond_var.notify_one();}   done =true; cond_var.notify_one();});   std::thread consumer([&](){std::unique_lock<std::mutex> lock(m);while(!done){while(!notified){// loop to avoid spurious wakeups cond_var.wait(lock);}while(!produced_nums.empty()){std::cout<<"consuming "<< produced_nums.front()<<'\n'; produced_nums.pop();} notified =false;}});   producer.join(); consumer.join();}

      Résultat possible : 

      producing 0 consuming 0 producing 1 consuming 1 producing 2 consuming 2 producing 3 consuming 3 producing 4 consuming 4
      Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/thread/condition_variable&oldid=50101 »
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