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https://github.com/golang/go
synced 2024-10-03 06:31:22 -06:00
ad3600945a
This makes it easier to experiment with alternative implementations. While we're here, update the comments. No functional changes. Passes toolstash -cmp. Change-Id: I428535754908f0fdd7cc36c214ddb6e1e60f376e Reviewed-on: https://go-review.googlesource.com/8310 Reviewed-by: Keith Randall <khr@golang.org> Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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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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package runtime
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import _ "unsafe" // for go:linkname
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//go:generate go run wincallback.go
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//go:generate go run mkduff.go
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var ticks struct {
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lock mutex
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pad uint32 // ensure 8-byte alignment of val on 386
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val uint64
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}
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var tls0 [8]uintptr // available storage for m0's TLS; not necessarily used; opaque to GC
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// Note: Called by runtime/pprof in addition to runtime code.
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func tickspersecond() int64 {
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r := int64(atomicload64(&ticks.val))
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if r != 0 {
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return r
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}
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lock(&ticks.lock)
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r = int64(ticks.val)
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if r == 0 {
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t0 := nanotime()
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c0 := cputicks()
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usleep(100 * 1000)
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t1 := nanotime()
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c1 := cputicks()
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if t1 == t0 {
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t1++
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}
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r = (c1 - c0) * 1000 * 1000 * 1000 / (t1 - t0)
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if r == 0 {
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r++
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}
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atomicstore64(&ticks.val, uint64(r))
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}
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unlock(&ticks.lock)
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return r
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}
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var envs []string
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var argslice []string
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//go:linkname syscall_runtime_envs syscall.runtime_envs
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func syscall_runtime_envs() []string { return append([]string{}, envs...) }
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//go:linkname os_runtime_args os.runtime_args
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func os_runtime_args() []string { return append([]string{}, argslice...) }
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