gcc/libcilkrts/runtime/config/generic/os-fence.h

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/*
 * void __cilkrts_fence(void)
 *
 * Executes an MFENCE instruction to serialize all load and store instructions
 * that were issued prior the MFENCE instruction. This serializing operation
 * guarantees that every load and store instruction that precedes the MFENCE
 * instruction is globally visible before any load or store instruction that
 * follows the MFENCE instruction. The MFENCE instruction is ordered with
 * respect to all load and store instructions, other MFENCE instructions, any
 * SFENCE and LFENCE instructions, and any serializing instructions (such as
 * the CPUID instruction).
 */

COMMON_SYSDEP void __cilkrts_fence(void); ///< MFENCE instruction