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25 lines
645 B
Go
25 lines
645 B
Go
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// TODO(raggi): update build tag after toolchain update
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//go:build tailscale_go
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package syncs
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import (
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"runtime"
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)
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//lint:ignore U1000 unused under tailscale_go builds.
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type shardValuePool struct{}
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// NewShardValue constructs a new ShardValue[T] with a shard per CPU.
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func NewShardValue[T any]() *ShardValue[T] {
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return &ShardValue[T]{shards: make([]T, runtime.NumCPU())}
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}
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// One yields a pointer to a single shard value with best-effort P-locality.
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func (sp *ShardValue[T]) One(f func(*T)) {
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f(&sp.shards[runtime.TailscaleCurrentP()%len(sp.shards)])
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}
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