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std::lock_guard

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C++
 
Thema Support-Bibliothek
Threads
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Threads
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thread(C++11)
this_thread Namespace
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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)
Gegenseitigen Ausschluss
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Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Generische Sperrverwaltung
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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)
Zustand Variablen
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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::lock_guard
Member-Funktionen
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Member functions
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lock_guard::lock_guard
lock_guard::~lock_guard
 
definiert in Header <mutex>
template< class Mutex >
class lock_guard;
 (seit C++11)
Die Klasse lock_guard ist ein Mutex Wrapper, eine bequeme RAII-Stil Mechanismus für den Besitz eines Mutex für die Dauer eines scoped Block stellt .
Original:
The class lock_guard is a mutex wrapper that provides a convenient RAII-Stil mechanism for owning a mutex for the duration of a scoped block.
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Wenn ein lock_guard Objekt erstellt wird, versucht er, Besitz des Mutex ist es gegeben zu nehmen. Wenn die Steuerung den Umfang, in dem die lock_guard Objekt erstellt wurde verlässt, wird die lock_guard zerstört und der Mutex freigegeben wird .
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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Die lock_guard Klasse ist nicht kopierbar. Die mitgelieferte Mutex Art führt den BasicLockable Konzept .
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The lock_guard class is non-copyable. The supplied Mutex type shall implement the BasicLockable concept.
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[Bearbeiten] Mitglied Typen

Mitglied Typ
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Member type
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 Definition
mutex_type
Mutex
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Mutex
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[Bearbeiten] Member-Funktionen
konstruiert eine lock_guard, gegebenenfalls Verriegeln des gegebenen Mutex
Original:
constructs a lock_guard, optionally locking the given mutex
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(öffentliche Elementfunktion) [edit]
zerstört sich die lock_guard Objekt, entriegelt die zugrunde liegenden Mutex
Original:
destructs the lock_guard object, unlocks the underlying mutex
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(öffentliche Elementfunktion) [edit]

[Bearbeiten] Beispiel

#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();
}


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