說明說得很明白，就是等侍num_closures 為零的時候回調done_closure,代碼也很簡單，不加詳述 #ifndef BASE_BARRIER_CLOSURE_H_ #define BASE_BARRIER_CLOSURE_H_ ? #include "base/base_export.h" #include "base/callback_forward.h" ? namespace base { ? // BarrierClosure executes |done_closure| after it has been invoked // |num_closures| times. // // If |num_closures| is 0, |done_closure| is executed immediately. // // BarrierClosure is thread-safe - the count of remaining closures is // maintained as a base::AtomicRefCount. |done_closure| will be run on // the thread that calls the final Run() on the returned closures. // // |done_closure| is also Reset() on the final calling thread but due to the // refcounted nature of callbacks, it is hard to know what thread resources // will be released on. BASE_EXPORT base::Closure BarrierClosure(int num_closures, const base::Closure& done_closure); ? } // namespace base ? #endif // BASE_BARRIER_CLOSURE_H_

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轉載于:https://www.cnblogs.com/csxy/p/fc7bb5979ebe0627569fedfa0895a4ec.html

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