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std::condition_variable_any

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Defined in header <condition_variable>
class condition_variable_any;
(since C++11)

The condition_variable_any class is a generalization of std::condition_variable. Whereas std::condition_variable works only on std::unique_lock<std::mutex>, condition_variable_any can operate on any lock that meets the BasicLockable requirements.

See std::condition_variable for the description of the semantics of condition variables.

The class std::condition_variable_any is a standard-layout class. It is not copy-constructible, move-constructible, copy-assignable, or move-assignable.

If the lock is std::unique_lock, std::condition_variable may provide better performance.

Contents

[edit] Member functions

constructs the object
(public member function) [edit]
destructs the object
(public member function) [edit]
operator=
[deleted]
not copy-assignable
(public member function) [edit]
Notification
notifies one waiting thread
(public member function) [edit]
notifies all waiting threads
(public member function) [edit]
Waiting
blocks the current thread until the condition variable is woken up
(public member function) [edit]
blocks the current thread until the condition variable is woken up or after the specified timeout duration
(public member function) [edit]
blocks the current thread until the condition variable is woken up or until specified time point has been reached
(public member function) [edit]

[edit] Notes

std::condition_variable_any can be used with std::shared_lock in order to wait on a std::shared_mutex in shared ownership mode.

A possible use for std::condition_variable_any with custom Lockable types is to provide convenient interruptible waits: the custom lock operation would both lock the associated mutex as expected, and also perform the necessary setup to notify this condition variable when the interrupting signal is received.[1]

[edit] References

  1. A. Williams (2012), "C++ concurrency in action" 9.2.4 Interupting a wait on std::condition_variable_any