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std::shared_lock::try_lock_for

STD：：共享[医]锁：：试一试[医]锁[医]为

template< class Rep, class Period > bool try_lock_for( const std::chrono::duration& timeout_duration ​(since C++14)

尝试将关联的互斥锁在共享模式下。块，直到指定timeout_duration已过或已取得锁，以第一位为准。关于成功锁定获取返回true，否则返回false.有效地打电话mutex()->try_lock_shared_for(timeout_duration)...

用一个稳定的时钟来测量持续时间。此函数的阻塞时间可能超过timeout_duration由于调度或资源争用延迟。

std::system_error如果没有关联的互斥对象，或者互斥对象已经锁定，则引发。

参数

timeout_duration-maximum duration to block for

返回值

true如果互斥体的所有权已经成功获得，false否则。

例外

  • 引发的任何异常mutex()->try_lock_shared_for(timeout_duration)

  • 如果没有关联的互斥，std::system_error错误代码为std::errc::operation_not_permitted

  • 如果互斥锁已经锁定，std::system_error错误代码为std::errc::resource_deadlock_would_occur

例

另见

try_lock_forattempts to lock the associated TimedLockable mutex, returns if the mutex has been unavailable for the specified time duration (public member function of std::unique_lock)
locklocks the associated mutex (public member function)
try_locktries to lock the associated mutex (public member function)
try_lock_untiltries to lock the associated mutex, until a specified time point (public member function)
unlockunlocks the associated mutex (public member function)

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