std::unique_lock::lock
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< cpp | thread | unique lock
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void lock(); | (dal C++11) | |
Blocca il mutex associato. Chiama efficacemente mutex()->lock().
Original:
Locks the associated mutex. Effectively calls mutex()->lock().
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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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Indice |
[modifica]Parametri
(Nessuno)
Original:
(none)
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[modifica]Valore di ritorno
(Nessuno)
Original:
(none)
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[modifica]Eccezioni
- Eventuali eccezioni generate dal mutex()->lock()Original:Any exceptions thrown by mutex()->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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[modifica]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. The text has been machine-translated via Google Translate.
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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 operationstd::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
[modifica]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) | |
