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std::atomic_flag::wait(3) C++ Standard Libary std::atomic_flag::wait(3) NAME std::atomic_flag::wait - std::atomic_flag::wait Synopsis void wait( bool old, std::memory_order order = std::memory_order::seq_cst ) const (1) (since C++20) noexcept; void wait( bool old, std::memory_order order = std::memory_order::seq_cst ) const (2) (since C++20) volatile noexcept; Performs atomic waiting operations. Behaves as if it repeatedly per- forms the following steps: * Compare this->test(order) with that of old. * If those are equal, then blocks until *this is notified by notify_one() or notify_all(), or the thread is unblocked spuriously. * Otherwise, returns. These functions are guaranteed to return only if value has changed, even if underlying implementation unblocks spuriously. If order is one of std::memory_order::release and std::memory_or- der::acq_rel, the behavior is undefined. Parameters old - the value to check the atomic_flag's object no longer con- tains order - memory order constraints to enforce Return value (none) Notes This form of change-detection is often more efficient than simple polling or pure spinlocks. Due to the ABA problem, transient changes from old to another value and back to old might be missed, and not unblock. Example This section is incomplete Reason: no example See also notify_one notifies at least one thread waiting on the atomic object (C++20) (public member function) notify_all notifies all threads blocked waiting on the atomic object (C++20) (public member function) atomic_flag_notify_one notifies a thread blocked in atomic_flag_wait (C++20) (function) atomic_flag_notify_all notifies all threads blocked in atomic_flag_wait (C++20) (function) Category: * Todo no example http://cppreference.com 2024.06.10 std::atomic_flag::wait(3)
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