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std::condition_variable_any::notify_all

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C++
 
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std::condition_variable_any
 
void notify_all();
 (since C++11)

If any threads is waiting on *this, unblocks all of the waiting threads.

Contents

[edit] Parameters

(none)

[edit] Return value

(none)

[edit] Exceptions

noexcept specification:  
noexcept
  (since C++11)

[edit] Example

#include <iostream>
#include <condition_variable>
#include <thread>
#include <chrono>
 
std::condition_variable_any cv;
std::mutex cv_m;
int i = 0;
 
void waits()
{
    std::unique_lock<std::mutex> lk(cv_m);
    std::cerr << "Waiting... \n";
    cv.wait(lk, [](){return i == 1;});
    std::cerr << "...finished waiting. i == 1\n";
}
 
void signals()
{
    std::this_thread::sleep_for(std::chrono::seconds(1));
    std::cerr << "Notifying...\n";
    cv.notify_all();
    std::this_thread::sleep_for(std::chrono::seconds(1));
    i = 1;
    std::cerr << "Notifying again...\n";
    cv.notify_all();
}
 
int main()
{
    std::thread t1(waits), t2(waits), t3(waits), t4(signals);
    t1.join(); t2.join(), t3.join(), t4.join();
}

Output: 

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

[edit] See also

 notifies one waiting thread
(public member function) [edit]
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