std::defer_lock_t, std::try_to_lock_t, std::adopt_lock_t

 

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スレッド Original: Threads The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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this_thread空間 Original: this_thread namespace The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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汎用のロック管理 Original: Generic lock management The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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)
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struct defer_lock_t { };		(C + + 11以来)
struct try_to_lock_t { };		(C + + 11以来)
struct adopt_lock_t { };		(C + + 11以来)

std::defer_lock_t、std::try_to_lock_tとstd::adopt_lock_tstd::lock_guardとstd::unique_lockためのロック方法を指定するために使用する空の構造体タグタイプです.

Original:

std::defer_lock_t, std::try_to_lock_t and std::adopt_lock_t are empty struct tag types used to specify locking strategy for std::lock_guard and std::unique_lock.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

タイプ Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Effect(s)
defer_lock_t	ミューテックスの所有権を取得するものではありません Original: do not acquire ownership of the mutex The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
try_to_lock_t	ブロックせずに、ミューテックスの所有権を取得しよう Original: try to acquire ownership of the mutex without blocking The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
adopt_lock_t	呼び出し元のスレッドが既にミューテックスの所有権を持っていると仮定する Original: assume the calling thread already has ownership of the mutex The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

例

#include <mutex>
#include <thread>
 
struct bank_account {
    explicit bank_account(int balance) : balance(balance) {}
    int balance;
    std::mutex m;
};
 
void transfer(bank_account &from, bank_account &to, int amount)
{
    // attempt to lock both mutexes without deadlock
    std::lock(from.m, to.m);
 
    // make sure both already-locked mutexes are unlocked when 
    // we're done; if we just used the lock_guard without std::lock
    // and std::adopt_lock, we might deadlock with other calls to transfer
    std::lock_guard lock1(from.m, std::adopt_lock);
    std::lock_guard lock2(to.m, std::adopt_lock);
 
    from.balance -= amount;
    to.balance += amount;
}
 
int main()
{
    bank_account my_account(100);
    bank_account your_account(50);
 
    std::thread t1(transfer, my_account, your_account, 10);
    std::thread t2(transfer, your_account, my_account, 5);
 
    t1.join();
    t2.join();
}

も参照してください

defer_lock try_to_lock adopt_lock	タグの定数は、ロック方法を指定するために使用します Original: tag constants used to specify locking strategy The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (定数)
(constructor)	オプションで、任意のミューテックスをロックして、lock_guardを構築します Original: constructs a lock_guard, optionally locking the given mutex The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数of std::lock_guard)
(constructor)	必要に応じて付属のミューテックスをロックして、unique_lockを構築します Original: constructs a unique_lock, optionally locking the supplied mutex The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数of std::unique_lock)