Atomically changes the state of a atomic_flag pointed to by obj to clear (false). The first version orders memory accesses according to memory_order_seq_cst, the second version orders memory accesses according to order.
The argument is pointer to a volatile atomic flag to accept addresses of both non-volatile and volatile (e.g. memory-mapped I/O) atomic flags.
[edit] Parameters obj - pointer to the atomic flag object to modify order - the memory synchronization ordering for this operation: all values are permitted [edit] Return value(none)
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