std::recursive_mutex::lock
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| void lock(); |
(seit C++11) | |
Sperrt den Mutex. Wenn ein anderer Thread bereits den Mutex gesperrt hat, wird die Ausführung des Threads solange blockiert, bis der Mutex gesperrt werden kann.
A thread may call lock on a recursive mutex repeatedly. Ownership will only be released after the thread makes a matching number of calls to unlock.
The maximum number of levels of ownership is unspecified. An exception of type std::system_error will be thrown if this number is exceeded.
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[Bearbeiten] Parameter
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[Bearbeiten] Rückgabewert
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[Bearbeiten] Ausnahmen
lock der Erfüllung ihrer Vorgaben verhindern würde .lock from meeting its specifications.You can help to correct and verify the translation. Click here for instructions.
[Bearbeiten] Beispiel
lock und unlock verwendet werden, um gemeinsam genutzte Daten zu schützen .
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
[Bearbeiten] Siehe auch
| versucht den Mutex zu sperren und kehrt zurück, wenn der Mutex nicht verfügbar ist (öffentliche Elementfunktion) | |
| entsperrt den Mutex (öffentliche Elementfunktion) | |
