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