std::try_lock
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| Defined in header <mutex>
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| template< class Lockable1, class Lockable2, class LockableN... > int try_lock( Lockable1& lock1, Lockable2& lock2, LockableN& lockn... ); |
(C + + 11以来) | |
与えられたオブジェクト
Lockablelock1、lock2、...、lockn最初に注文初めにtry_lockを呼び出すことによって、各..をロックしよう Original:
Tries to lock each of the given
Lockable objects lock1, lock2, ..., lockn by calling try_lock in order beginning with the first. The text has been machine-translated via Google Translate.
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try_lockの呼び出しが失敗した場合、unlockは、ロックされたオブジェクトに対して呼び出され、ロックに失敗したオブジェクトの0ベースのインデックスが返されます。.Original:
If a call to
try_lock fails, unlock is called for any locked objects and a 0-based index of the object that failed to lock is returned.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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例外で
try_lock結果を呼び出した場合、unlockは、再スローする前に、ロックされたオブジェクトに対して呼び出され.Original:
If a call to
try_lock results in an exception, unlock is called for any locked objects before rethrowing.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
目次 |
[編集] パラメータ
| lock1, lock2, ... , lockn | - | Lockableは、オブジェクトロックするOriginal: the Lockable objects to lockThe text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[編集] 値を返します
ロックに失敗したオブジェクトの
-1成功した場合に、または0ベースのインデックス値.Original:
-1 on success, or 0-based index value of the object that failed to lock.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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[編集] 例
次の例では、別のスレッドで実行されている定期的に集計し、リセットカウンタに
std::try_lockを使用しています.
Original:
The following example uses
std::try_lock to periodically tally and reset counters running in separate threads.
The text has been machine-translated via Google Translate.
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#include <mutex> #include <vector> #include <thread> #include <iostream> #include <functional> #include <chrono> int main() { int foo_count = 0; std::mutex foo_count_mutex; int bar_count = 0; std::mutex bar_count_mutex; int overall_count = 0; bool done = false; std::mutex done_mutex; auto increment = [](int &counter, std::mutex &m, const char *desc) { for (int i = 0; i < 10; ++i) { std::unique_lock<std::mutex> lock(m); ++counter; std::cout << desc << ": " << counter << '\n'; lock.unlock(); std::this_thread::sleep_for(std::chrono::seconds(1)); } }; std::thread increment_foo(increment, std::ref(foo_count), std::ref(foo_count_mutex), "foo"); std::thread increment_bar(increment, std::ref(bar_count), std::ref(bar_count_mutex), "bar"); std::thread update_overall([&]() { done_mutex.lock(); while (!done) { done_mutex.unlock(); int result = std::try_lock(foo_count_mutex, bar_count_mutex); if (result == -1) { overall_count += foo_count + bar_count; foo_count = 0; bar_count = 0; std::cout << "overall: " << overall_count << '\n'; foo_count_mutex.unlock(); bar_count_mutex.unlock(); } std::this_thread::sleep_for(std::chrono::seconds(2)); done_mutex.lock(); } done_mutex.unlock(); }); increment_foo.join(); increment_bar.join(); done_mutex.lock(); done = true; done_mutex.unlock(); update_overall.join(); std::cout << "Done processing\n" << "foo: " << foo_count << '\n' << "bar: " << bar_count << '\n' << "overall: " << overall_count << '\n'; }
Possible output:
bar: 1 foo: 1 foo: 2 bar: 2 foo: 3 overall: 5 bar: 1 foo: 1 bar: 2 foo: 2 bar: 3 overall: 10 bar: 1 foo: 1 bar: 2 foo: 2 overall: 14 bar: 1 foo: 1 bar: 2 overall: 17 foo: 1 bar: 1 foo: 2 overall: 20 Done processing foo: 0 bar: 0 overall: 20
[編集] も参照してください
| (C++11) |
指定されたミューテックスをロックして、もしあればブロックは使用できません Original: locks specified mutexes, blocks if any are unavailable The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (関数テンプレート) |