Namespace
Varianti

std::timed_mutex::lock

Da cppreference.com.
< cpp‎ | thread‎ | timed mutex

 
 
Discussione libreria di supporto
Threads
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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
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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::timed_mutex
Membri funzioni
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Member functions
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timed_mutex::timed_mutex
Bloccaggio
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Locking
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timed_mutex::lock
timed_mutex::try_lock
timed_mutex::try_lock_for
timed_mutex::try_lock_until
timed_mutex::unlock
Maniglia nativo
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Native handle
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timed_mutex::native_handle
 
void lock();
(dal C++11)
Blocca il mutex. Se un altro thread ha già bloccato il mutex, una chiamata a lock bloccherà l'esecuzione fino a quando il blocco è stato acquisito.
Original:
Locks the mutex. If another thread has already locked the mutex, a call to lock will block execution until the lock is acquired.
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Indice

[modifica] Parametri

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

(Nessuno)
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(none)
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[modifica] Eccezioni

Genera std::system_error quando si verificano errori, compresi gli errori del sistema operativo sottostante che impedirebbero lock dal soddisfare le sue specifiche.
Original:
Throws std::system_error when errors occur, including errors from the underlying operating system that would prevent lock from meeting its specifications.
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Note

A program may deadlock if a thread that already owns a mutex calls lock on that mutex. Alternatively, if an implementation can detect the deadlock, a resource_deadlock_would_occur error condition may be observed.

[modifica] Esempio

Questo esempio mostra come lock unlock e può essere utilizzato per proteggere i dati condivisi .
Original:
This example shows how lock and unlock can be used to protect shared data.
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#include <iostream>
#include <chrono>
#include <thread>
#include <mutex>
 
int g_num = 0;  // protected by g_num_mutex
std::mutex g_num_mutex;
 
void slow_increment(int id) 
{
  for (int i = 0; i < 3; ++i) {
    g_num_mutex.lock();
    ++g_num;
    std::cout << id << " => " << g_num << '\n';
    g_num_mutex.unlock();
 
    std::this_thread::sleep_for(std::chrono::seconds(1));
  }
}
 
int main()
{
  std::thread t1(slow_increment, 0);
  std::thread t2(slow_increment, 1);
  t1.join();
  t2.join();
}

Possible output:

0 => 1
1 => 2
0 => 3
1 => 4
0 => 5
1 => 6

[modifica] Vedi anche

prova a bloccare il mutex, restituisce se il mutex non è disponibile
Original:
tries to lock the mutex, returns if the mutex is not available
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(membro pubblico funzione) [edit]
prova a bloccare il mutex, restituisce se il mutex è been
unavailable per la durata del timeout specificato
Original:
tries to lock the mutex, returns if the mutex has been
unavailable for the specified timeout duration
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(membro pubblico funzione) [edit]
prova a bloccare il mutex, restituisce se il mutex è been
unavailable fino al punto di tempo specificato è stato raggiunto
Original:
tries to lock the mutex, returns if the mutex has been
unavailable until specified time point has been reached
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(membro pubblico funzione) [edit]
sblocca il mutex
Original:
unlocks the mutex
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(membro pubblico funzione) [edit]