std::condition_variable::notify_one
De cppreference.com
<metanoindex/>
<tbody> </tbody> void notify_one(); |
(desde C++11) | |
Se quaisquer segmentos estão aguardando em
*this, chamando notify_one desbloqueia um dos segmentos de espera.Original:
If any threads are waiting on
*this, calling notify_one unblocks one of the waiting threads.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Parâmetros
(Nenhum)
Original:
(none)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Valor de retorno
(Nenhum)
Original:
(none)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Exceções
Exemplo
#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();
}
Potencial saída:
Waiting...
Notifying...
Notifying again...
...finished waiting. i == 1