Method unmap

source/core/Tensor.cpp:463–488

}

void Tensor::unmap(MapType mtype, DimensionType dtype, void *mapPtr) {
    auto nativeDescribe = mDescribe;
    auto bn = nativeDescribe->getBackend();
    if (nullptr == bn) {
        return;
    }

    bool ret = bn->onUnmapTensor(mtype, dtype, this, mapPtr);
    if(true == ret) {
        //do unmap already, just return
        return;
    }

    if(mtype == Tensor::MAP_TENSOR_WRITE) {
        //srcTensor alloc
        MNN::Tensor srcTensor(this, dtype, false);
        srcTensor.buffer().host = (uint8_t *)mapPtr;

        //use onCopyBuffer
        bn->onCopyBuffer(&srcTensor, this);
    }
    if(mapPtr != nullptr) {
        free(mapPtr);
        mapPtr = nullptr;
    }
}
int Tensor::wait(MapType mtype, bool finish) {
    auto nativeDescribe = mDescribe;
    auto bn = nativeDescribe->getBackend();