Method ReleaseDeferredWindowUpdate

src/brpc/policy/http2_rpc_protocol.cpp:1071–1076

}

inline int64_t H2Context::ReleaseDeferredWindowUpdate() {
    if (_deferred_window_update.load(butil::memory_order_relaxed) == 0) {
        return 0;
    }
    return _deferred_window_update.exchange(0, butil::memory_order_relaxed);
}

void H2Context::DeferWindowUpdate(int64_t size) {
    if (size <= 0) {