std::lock_guard

 

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std::lock_guard

Membri funzioni Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

lock_guard::lock_guard

lock_guard::~lock_guard

 

Elemento definito nell'header <mutex>
template<class Mutex > class lock_guard;		(dal C++11)

Il lock_guard classe è un wrapper mutex che fornisce un comodo meccanismo Raii stile per possedere un mutex per la durata di un blocco ambito.

Original:

The class lock_guard is a mutex wrapper that provides a convenient Raii stile mechanism for owning a mutex for the duration of a scoped block.

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Quando un oggetto viene creato lock_guard, tenta di assumere la proprietà del mutex è dato. Quando il controllo lascia il campo di applicazione in cui è stato creato l'oggetto lock_guard, il lock_guard viene distrutto e il mutex viene rilasciato.

Original:

When a lock_guard object is created, it attempts to take ownership of the mutex it is given. When control leaves the scope in which the lock_guard object was created, the lock_guard is destructed and the mutex is released.

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La classe lock_guard non è copiabile. Il tipo di Mutex fornito l'esecuzione del concetto BasicLockable.

Original:

The lock_guard class is non-copyable. The supplied Mutex type shall implement the BasicLockable concept.

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Membri tipi

Membro tipo Original: Member type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Definition
mutex_type	Mutex Original: Mutex The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Membri funzioni

(costruttore)	costruisce un lock_guard, opzionalmente bloccare il mutex dato Original: constructs a lock_guard, optionally locking the given mutex The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)
(destructor)	distrugge l'oggetto lock_guard, sblocca il mutex sottostante Original: destructs the lock_guard object, unlocks the underlying mutex The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)

Esempio

#include <thread>#include <mutex>   int g_i =0;std::mutex g_i_mutex;// protects g_i   void safe_increment(){ std::lock_guard<std::mutex> lock(g_i_mutex);++g_i;   // g_i_mutex is automatically released when lock// goes out of scope}   int main(){std::thread t1(safe_increment);std::thread t2(safe_increment);   t1.join(); t2.join();}