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std::condition_variable_any::wait

提供: cppreference.com

 
 
スレッドのサポートライブラリ
スレッド
Original:
Threads
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thread(C++11)
this_thread空間
Original:
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
Original:
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
Original:
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_any
メンバ関数
Original:
Member functions
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condition_variable_any::condition_variable_any
condition_variable_any::~condition_variable_any
通知
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Notification
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condition_variable_any::notify_one
condition_variable_any::notify_all
待っています
Original:
Waiting
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condition_variable_any::wait
condition_variable_any::wait_for
condition_variable_any::wait_until
ネイティブハンドル
Original:
Native handle
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condition_variable_any::native handle
 
template< class Lock >
void wait( Lock& lock );
(1) (C + + 11以来)
template< class Lock, class Predicate >
void wait( Lock& lock, Predicate pred );
(2) (C + + 11以来)
wait条件変数に通知またはスプリアスウェイクアップが発生し、いくつかの述語が満たされるまで、必要に応じてループされるまでブロックし、現在のスレッドを起こす.
Original:
wait causes the current thread to block until the condition variable is notified or a spurious wakeup occurs, optionally looping until some predicate is satisfied.
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1)
アトミックlock、ブロックは現在実行中のスレッドを解放し、*thisで待機しているスレッドのリストに追加します。 notify_all()またはnotify_one()実行されたときにスレッドのブロックが解除されます。また、偽ってブロックを解除することができる。ブロックを解除する場合は、理由に関わらず、lockは再取得さwait終了です。例外によってこの関数が終了した場合は、lockも再取得される.
Original:
Atomically releases lock, blocks the current executing thread, and adds it to the list of threads waiting on *this. The thread will be unblocked when notify_all() or notify_one() is executed. It may also be unblocked spuriously. When unblocked, regardless of the reason, lock is reacquired and wait exits. If this function exits via exception, lock is also reacquired.
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2)
に相当する
Original:
Equivalent to
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while (!pred()) {
  wait(lock);
}

真なるための特定の条件を待っている間、このオーバーロードは、スプリアスの覚醒を無視するために使用されるかもしれません.
Original:
This overload may be used to ignore spurious awakenings while waiting for a specific condition to become true.
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目次

[編集] パラメータ

lock -
現在のスレッドによってロックされている必要がありLock要件を満たしているタイプBasicLockableのオブジェクト
Original:
an object of type Lock that meets the BasicLockable requirements, which must be locked by the current thread
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pred - predicate which returns ​false
待機している場合は、継続すべきである
Original:
if the waiting should be continued
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.

The signature of the predicate function should be equivalent to the following:

 bool pred();

[編集] 値を返します

(なし)
Original:
(none)
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[編集] 例外

std::system_errorをスローする可能性があり、またlock.lock()またはlock.unlock()によってスローされた例外を伝播する可能性.
Original:
May throw std::system_error, may also propagate exceptions thrown by lock.lock() or lock.unlock().
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[編集] ノート

lock.mutex()が現在のスレッドによってロックされていない場合は、この関数を呼び出すと、未定義の動作です.
Original:
Calling this function if lock.mutex() is not locked by the current thread is undefined behavior.
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lock.mutex()は現在同じ条件変数で待っている他のすべてのスレッドが使用するものと同じミューテックスない場合は、この関数を呼び出すと、未定義の動作です.
Original:
Calling this function if lock.mutex() is not the same mutex as the one used by all other threads that are currently waiting on the same condition variable is undefined behavior.
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[編集]

[edit]
#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

[編集] も参照してください

現在のスレッドのブロックを条件変数が目覚めたり、指定されたタイムアウト期間の後にされるまで
Original:
blocks the current thread until the condition variable is woken up or after the specified timeout duration
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(パブリックメンバ関数) [edit]
条件変数はウェイクアップされるまで、または指定された時点に達するまで、現在のスレッドをブロックします
Original:
blocks the current thread until the condition variable is woken up or until specified time point has been reached
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(パブリックメンバ関数) [edit]