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      std::atomic_flag_clear,std::atomic_flag_clear_explicit

      From cppreference.com
      <cpp‎ |atomic
       
       
      Concurrency support library
      Threads
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      this_thread namespace
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      (C++11)
      (C++11)
      Cooperative cancellation
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      (C++11)
      (C++11)
      (C++11)
      (C++11)
      Condition variables
      (C++11)
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      Initialization of atomic types
      (C++11)(deprecated in C++20)
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      Memory ordering
      (C++11)(deprecated in C++26)
      Free functions for atomic operations
      Free functions for atomic flags
      atomic_flag_clearatomic_flag_clear_explicit
      (C++11)(C++11)
       
      Defined in header<atomic>
      void atomic_flag_clear(volatilestd::atomic_flag* obj)noexcept;
      		 (1)(since C++11)
      void atomic_flag_clear(std::atomic_flag* obj)noexcept;
      		 (2)(since C++11)
      void atomic_flag_clear_explicit(volatilestd::atomic_flag* obj,
                                       std::memory_order order)noexcept;
      		 (3)(since C++11)
      void atomic_flag_clear_explicit(std::atomic_flag* obj,
                                       std::memory_order order)noexcept;
      		 (4)(since C++11)

      Atomically changes the state of thestd::atomic_flag pointed to byobj to clear (false).

      1,2) The memory synchronization ordering isstd::memory_order_seq_cst.
      3,4) The memory synchronization ordering isorder.
      Iforder is one ofstd::memory_order_consume,std::memory_order_acquire andstd::memory_order_acq_rel, the behavior is undefined.

      Contents

      [edit]Parameters

      obj - pointer tostd::atomic_flag to access
      order - the memory synchronization ordering

      [edit]Notes

      std::atomic_flag_clear andstd::atomic_flag_clear_explicit can be implemented asobj->clear() andobj->clear(order) respectively.

      [edit]Defect reports

      The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

      DRApplied toBehavior as publishedCorrect behavior
      LWG 2138C++11order could bestd::memory_order_consumethe behavior is undefined in this case

      [edit]See also

      the lock-free boolean atomic type
      (class)[edit]
      atomically sets the flag totrue and returns its previous value
      (function)[edit]
      defines memory ordering constraints for the given atomic operation
      (enum)[edit]
      C documentation foratomic_flag_clear,atomic_flag_clear_explicit
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