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Michael PrattandgVisor bot
a8d6cc4072
This removes the need to check the offset every release. I've also removed the negative build tag from runtime_amd64.go, which less obviously correct. In theory, we should check that this package's use of nmspinning is still valid in each release, but there is no way to automate that and I don't realistically seeing checking happening beyond verifying tests work. Additionally, the existing use is already suspect. :) The good news is the misuse is likely to cause scheduling issues, not memory corruption. PiperOrigin-RevId: 505114683
31 lines
579 B
Go
31 lines
579 B
Go
// Copyright 2020 The gVisor Authors.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build amd64
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package sync
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import (
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"sync/atomic"
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)
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const supportsWakeSuppression = true
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// addrOfSpinning returns the address of runtime.sched.nmspinning.
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func addrOfSpinning() *int32
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// nmspinning caches addrOfSpinning.
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var nmspinning = addrOfSpinning()
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//go:nosplit
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func preGoReadyWakeSuppression() {
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atomic.AddInt32(nmspinning, 1)
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}
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//go:nosplit
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func postGoReadyWakeSuppression() {
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atomic.AddInt32(nmspinning, -1)
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}
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