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std::condition_variable::notify_all

提供: cppreference.com

 
 
スレッドのサポートライブラリ
スレッド
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Threads
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thread(C++11)
this_thread空間
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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)
相互排除
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Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
汎用のロック管理
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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)
条件変数
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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)
先物
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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
メンバ関数
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Member functions
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condition_variable::condition_variable
condition_variable::~condition_variable
通知
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Notification
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condition_variable::notify_one
condition_variable::notify_all
待っています
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Waiting
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condition_variable::wait
condition_variable::wait_for
condition_variable::wait_until
ネイティブハンドル
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Native handle
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condition_variable::native handle
 
void notify_all();
(C++11およびそれ以降)

Unblocks all threads currently waiting for *this.

目次

[編集] パラメータ

(なし)
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(none)
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[編集] 値を返します

(なし)
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(none)
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[編集] 例外

noexcept specification:  
noexcept
  (C++11およびそれ以降)

[編集]

[edit]
#include <iostream>
#include <condition_variable>
#include <thread>
#include <chrono>
 
std::condition_variable 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

[編集] も参照してください

1待機中のスレッドに通知します
Original:
notifies one waiting thread
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(パブリックメンバ関数) [edit]