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std::mutex::try_lock

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< cpp‎ | thread‎ | mutex

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C++
 
Discussione libreria di supporto
Threads
Original:
Threads
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thread(C++11)
this_thread spazio dei nomi
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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)
Mutua esclusione
Original:
Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Blocco di gestione generico
Original:
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)
Condizioni variabili
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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::mutex
Membri funzioni
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Member functions
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mutex::mutex
Bloccaggio
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Locking
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mutex::lock
mutex::try_lock
mutex::unlock
Maniglia nativo
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Native handle
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mutex::native_handle
 
bool try_lock();
 (dal C++11)
Tenta di bloccare il mutex. Ritorna immediatamente. Il successo restituisce acquisizione blocco true, altrimenti restituisce false.
Original:
Tries to lock the mutex. Returns immediately. On successful lock acquisition returns true, otherwise returns false.
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Indice

[modifica] Parametri

(Nessuno)
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(none)
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[modifica] Valore di ritorno

true se il blocco è stato acquisito con successo, altrimenti false.
Original:
true if the lock was acquired successfully, otherwise false.
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[modifica] Eccezioni

This section is incomplete

[modifica] Esempio

Questo esempio mostra blocco, try_lock e sbloccare in azione
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)
}

Output: 

lock acquired
lock not acquired
(program hangs)

[modifica] Vedi anche
blocca i blocchi mutex, se il mutex non è disponibile
Original:
locks the mutex, blocks if the mutex is not available
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(metodo pubblico) [modifica]
sblocca il mutex
Original:
unlocks the mutex
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(metodo pubblico) [modifica]
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