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This should reduce the waste of memory on the padding from 128 bytes to 64 bytes on GOARCH=amd64, while preserving bigger padding for platforms with bigger cache line sizes. See https://stackoverflow.com/questions/68320687/why-are-most-cache-line-sizes-designed-to-be-64-byte-instead-of-32-128byte-now Thanks to @tIGO for the hint
18 lines
449 B
Go
18 lines
449 B
Go
package atomicutil
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import (
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"sync/atomic"
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"unsafe"
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)
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// Uint64 is like atomic.Uint64, but is protected from false sharing.
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type Uint64 struct {
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// The padding prevents false sharing with the previous memory location
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_ [CacheLineSize - unsafe.Sizeof(atomic.Uint64{})%CacheLineSize]byte
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atomic.Uint64
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// The padding prevents false sharing with the next memory location
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_ [CacheLineSize - unsafe.Sizeof(atomic.Uint64{})%CacheLineSize]byte
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}
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