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

提供: cppreference.com
< cpp‎ | thread

 
 
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
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
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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)
 
struct defer_lock_t { };
(C++11およびそれ以降)
struct try_to_lock_t { };
(C++11およびそれ以降)
struct adopt_lock_t { };
(C++11およびそれ以降)
std::defer_lock_tstd::try_to_lock_tstd::adopt_lock_tstd::lock_guardstd::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.
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タイプ
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Type
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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
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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
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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
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[編集]

[edit]
#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();
}


[編集] も参照してください

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
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(定数) [edit]
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
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(パブリックメンバ関数of std::lock_guard) [edit]
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
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(パブリックメンバ関数of std::unique_lock) [edit]