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       mem_fence - Orders loads and stores of a work-item executing a kernel.

       void mem_fence(cl_mem_fence_flags flags);


       Orders loads and stores of a work-item executing a kernel. This means that loads and
       stores preceding the mem_fence will be committed to memory before any loads and stores
       following the mem_fence.

       The flags argument specifies the memory address space and can be set to a combination of
       the following literal values: CLK_LOCAL_MEM_FENCE, CLK_GLOBAL_MEM_FENCE.


       OpenCL Specification[1]




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        1. OpenCL Specification
           page 275, section 6.12.9 - Explicit Memory Fence Functions