std::recursive_mutex::unlock – cppreference.com

std::recursive_mutex::unlock

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<metanoindex/>

 
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::recursive_mutex
Member-Funktionen
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Member functions
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recursive_mutex::recursive_mutex
Sperren
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Locking
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recursive_mutex::lock
recursive_mutex::try_lock
recursive_mutex::unlock
Ureinwohner Griff
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Native handle
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recursive_mutex::native_handle
 
<tbody> </tbody>
void unlock();
 (seit C++11)
Das Mutex wieder aufgehoben .
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Unlocks the mutex.
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Parameter

(None)
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(none)
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Rückgabewert

(None)
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(none)
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Ausnahmen

This section is incomplete

Beispiel

Dieses Beispiel zeigt, Schloss, try_lock und entsperren in Aktion
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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)
}

Output: 

lock acquired
lock not acquired
(program hangs)

Siehe auch