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std::condition_variable::notify_one

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Thema Support-Bibliothek
Threads
Original:
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::condition_variable
Member-Funktionen
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Member functions
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condition_variable::condition_variable
condition_variable::~condition_variable
Notification
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Notification
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condition_variable::notify_one
condition_variable::notify_all
Warten
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Waiting
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condition_variable::wait
condition_variable::wait_for
condition_variable::wait_until
Ureinwohner Griff
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Native handle
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condition_variable::native handle
 
void notify_one();
(seit C++11)
Wenn alle Threads auf *this wartet, ruft notify_one freigibt einer der wartenden Threads .
Original:
If any threads are waiting on *this, calling notify_one unblocks one of the waiting threads.
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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

noexcept specification:  
noexcept
  (seit C++11)

[Bearbeiten] Beispiel

#include <iostream>
#include <condition_variable>
#include <thread>
#include <chrono>
 
std::condition_variable cv;
std::mutex cv_m;
int i = 0;
bool done = false;
 
void waits()
{
    std::unique_lock<std::mutex> lk(cv_m);
    std::cout << "Waiting... \n";
    cv.wait(lk, [](){return i == 1;});
    std::cout << "...finished waiting. i == 1\n";
    done = true;
}
 
void signals()
{
    std::this_thread::sleep_for(std::chrono::seconds(1));
    std::cout << "Notifying...\n";
    cv.notify_one();
 
    std::unique_lock<std::mutex> lk(cv_m);
    i = 1;
    while (!done) {
        lk.unlock();
        std::this_thread::sleep_for(std::chrono::seconds(1));
        lk.lock();
        std::cerr << "Notifying again...\n";
        cv.notify_one();
    }
}
 
int main()
{
    std::thread t1(waits), t2(signals);
    t1.join(); t2.join();
}

Possible output:

Waiting...
Notifying...
Notifying again...
...finished waiting. i == 1

[Bearbeiten] Siehe auch

benachrichtigt alle wartenden Threads
Original:
notifies all waiting threads
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(öffentliche Elementfunktion) [edit]