Memory barrier instruction

See also: Memory barrier SMP support have special hardware instruction for flushing PowerPC. Similarly, on powerpc, you will need an instruction like "lwsync" on mutex release if appropriate Memory barrier instructions are necessary if I don't want to have a pending interrupt triggered, or if need to access the something in the peripheral space which is related to the interrupt source, e.g Unfortunately, most code fragments using atomic instructions and memory barriers require detailed knowledge of the semantics of a given CPU's memory barriers and atomic instructions. On each core, instructions for working inside the cpu can be executed in disorder. Then the data written to memory after the logical order is not necessarily the last to be written. Memory barriers in C. Sergey Vojtovich Software Engineer @ MariaDB Foundation. Memory barriers (jointly with atomic operations) are intended to make data changes visible in concurrent Moreover, the memory barriers of this model are described, providing to the programmer a useful tool for Due to these instruction's reordering, safety nets, also known as memory barriers, have been But what's about memory barriers?. In case you place memory barriers between two operations like LoadLoad, LoadStore, StoreLoad or StoreStore, you have the guarantee, that specific LoadLoad