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std::unique_lock::lock

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< cpp‎ | thread‎ | unique lock

 
 
Thema Support-Bibliothek
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)
Gegenseitigen Ausschluss
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Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Generische Sperrverwaltung
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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)
Zustand Variablen
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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::unique_lock
Member-Funktionen
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Member functions
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unique_lock::unique_lock
unique_lock::~unique_lock
unique_lock::operator=
Sperren
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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
Modifiers
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Modifiers
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unique_lock::swap
unique_lock::release
Beobachter
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Observers
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unique_lock::mutex
unique_lock::owns_lock
unique_lock::operator bool
Non-Member-Funktionen
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Non-member functions
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std::swap
 
void lock();
(seit C++11)
Sperrt die zugehörige Mutex. Effektiv nennt mutex()->lock() .
Original:
Locks the associated mutex. Effectively calls mutex()->lock().
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std::system_error wird ausgelöst, wenn es keine zugehörige Mutex oder wenn der Mutex bereits gesperrt .
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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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Inhaltsverzeichnis

[Bearbeiten] Parameter

(None)
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(none)
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[Bearbeiten] Rückgabewert

(None)
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(none)
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[Bearbeiten] Ausnahmen

  • Etwaige Ausnahmen von mutex()->lock() geworfen
    Original:
    Any exceptions thrown by mutex()->lock()
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[Bearbeiten] Beispiel

Das folgende Beispiel verwendet lock zum Rückkauf eines Mutex, die war unverschlossen .
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

[Bearbeiten] Siehe auch

versucht, die zugehörige Mutex sperren, kehrt zurück, wenn der Mutex ist nicht verfügbar
Original:
tries to lock the associated mutex, returns if the mutex is not available
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(öffentliche Elementfunktion) [edit]
entriegelt die zugehörige Mutex
Original:
unlocks the associated mutex
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(öffentliche Elementfunktion) [edit]