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best jewelry wholesale online The message queue and pipeline are basically 4 copies, while the shared memory (MMAP, ShMGET) is only twice. 4 times: 1, copy data from the BUF of the user space to the kernel. 2. Copy the data to the memory. 3. Memory to the kernel. 4. BUF. 2 times from kernel to user space: 1. User space to memory. 2. Memory to user space. Em