std::unique_lock::lock
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<metanoindex/>
<tbody> </tbody> void lock(); |
(dal C++11) | |
Blocca il mutex associato. Chiama efficacemente
mutex()->lock().Original:
Locks the associated mutex. Effectively calls
mutex()->lock().The text has been machine-translated via Google Translate.
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std::system_error viene generata se non c'è mutex associato o se il mutex è già bloccato.
Original:
std::system_error is thrown if there is no associated mutex or if the mutex is already locked.
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Parametri
(Nessuno)
Original:
(none)
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Valore di ritorno
(Nessuno)
Original:
(none)
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Eccezioni
- Eventuali eccezioni generate dal
mutex()->lock()Original:Any exceptions thrown bymutex()->lock()The text has been machine-translated via Google Translate.
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- Se non vi è associato mutex, std::system_error con un codice di errore di std::errc::operation_not_permittedOriginal:If there is no associated mutex, std::system_error with an error code of std::errc::operation_not_permittedThe text has been machine-translated via Google Translate.
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- Se il mutex è già bloccato, std::system_error con un codice di errore di std::errc::resource_deadlock_would_occurOriginal:If the mutex is already locked, std::system_error with an error code of std::errc::resource_deadlock_would_occurThe text has been machine-translated via Google Translate.
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Esempio
L'esempio seguente utilizza
lock di ri-acquisire un mutex che è stato sbloccato .
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
Vedi anche
prova a bloccare il mutex associato, restituisce se il mutex non è disponibile Original: tries to lock the associated mutex, returns if the mutex is not available The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
sblocca il mutex associato Original: unlocks the associated mutex The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |