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std::mutex::try_lock

Da cppreference.com
< cpp‎ | thread‎ | mutex

 
 
Biblioteca de suporte a discussão
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)
Exclusão mútua
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Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Gestão de bloqueio genérico
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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)
Variáveis ​​de condição
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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)
Futuros
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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
Funções de membro
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Member functions
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mutex::mutex
Bloqueio
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Locking
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mutex::lock
mutex::try_lock
mutex::unlock
Identificador nativo
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Native handle
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mutex::native_handle
 
bool try_lock();
(a partir do C++ 11)
Tenta bloquear o mutex. Retorna imediatamente. Por volta de bloqueio de sucesso aquisição true, caso contrário retorna false.
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Tries to lock the mutex. Returns immediately. On successful lock acquisition returns true, otherwise returns false.
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Índice

[editar] Parâmetros

(Nenhum)
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(none)
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[editar] Valor de retorno

true se o bloqueio foi adquirida com sucesso, caso contrário, false.
Original:
true if the lock was acquired successfully, otherwise false.
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[editar] Exceções

[editar] Exemplo

Este exemplo mostra try_lock bloquear e desbloquear em ação
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)

[editar] Veja também

bloqueia o mutex, blocos se o mutex não está disponível
Original:
locks the mutex, blocks if the mutex is not available
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(função pública membro) [edit]
destrave o mutex
Original:
unlocks the mutex
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(função pública membro) [edit]