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std::unique_lock::lock

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< cpp‎ | thread‎ | unique lock

 
 
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
Original:
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::unique_lock
Funções de membro
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Member functions
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unique_lock::unique_lock
unique_lock::~unique_lock
unique_lock::operator=
Bloqueio
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Locking
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unique_lock::lock
unique_lock::try_lock
unique_lock::try_lock_for
unique_lock::try_lock_until
unique_lock::unlock
Modificadores
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Modifiers
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unique_lock::swap
unique_lock::release
Observadores
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Observers
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unique_lock::mutex
unique_lock::owns_lock
unique_lock::operator bool
Não-membros funções
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Non-member functions
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std::swap
 
void lock();
(a partir do C++ 11)
Bloqueia o mutex associado. Efetivamente chama mutex()->lock().
Original:
Locks the associated mutex. Effectively calls mutex()->lock().
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std::system_error é lançada se não houver mutex associado, ou se o mutex já está trancada.
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std::system_error is thrown if there is no associated mutex or if the mutex is already locked.
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Índice

[editar] Parâmetros

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

(Nenhum)
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(none)
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[editar] Exceções

  • Todas as exceções lançadas por mutex()->lock()
    Original:
    Any exceptions thrown by mutex()->lock()
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  • Se não houver um mutex associado, std::system_error com um código de erro de std::errc::operation_not_permitted
    Original:
    If there is no associated mutex, std::system_error with an error code of std::errc::operation_not_permitted
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  • Se o mutex já está bloqueado std::system_error, com um código de erro de std::errc::resource_deadlock_would_occur
    Original:
    If the mutex is already locked, std::system_error with an error code of std::errc::resource_deadlock_would_occur
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[editar] Exemplo

O exemplo a seguir usa lock para re-adquirir um mutex que foi desbloqueado .
Original:
The following example uses lock to re-acquire a mutex that was unlocked.
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#include <mutex>
#include <thread>
#include <iostream>
#include <vector>
#include <chrono>
 
int main()
{
    int counter = 0;
    std::mutex counter_mutex;
    std::vector<std::thread> threads;
 
    auto worker_task = [&](int id) {
        std::unique_lock<std::mutex> lock(counter_mutex);
        ++counter;
        std::cout << id << ", initial counter: " << counter << '\n';
        lock.unlock();
 
        // don't hold the lock while we simulate an expensive operation
        std::this_thread::sleep_for(std::chrono::seconds(1));
 
        lock.lock();
        ++counter;
        std::cout << id << ", final counter: " << counter << '\n';
    };
 
    for (int i = 0; i < 10; ++i) threads.emplace_back(worker_task, i);
 
    for (auto &thread : threads) thread.join();
}

Possible output:

0, initial counter: 1
1, initial counter: 2
2, initial counter: 3
3, initial counter: 4
4, initial counter: 5
5, initial counter: 6
6, initial counter: 7
7, initial counter: 8
8, initial counter: 9
9, initial counter: 10
6, final counter: 11
3, final counter: 12
4, final counter: 13
2, final counter: 14
5, final counter: 15
0, final counter: 16
1, final counter: 17
7, final counter: 18
9, final counter: 19
8, final counter: 20

[editar] Veja também

tenta bloquear o mutex associado, retorna se o mutex não está disponível
Original:
tries to lock the associated mutex, returns if the mutex is not available
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(função pública membro) [edit]
destrave o mutex associado
Original:
unlocks the associated mutex
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(função pública membro) [edit]