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https://github.com/golang/go
synced 2024-11-19 15:54:46 -07:00
1b9499b069
syscall.Getpagesize currently returns hard-coded page sizes on all architectures (some of which are probably always wrong, and some of which are definitely not always right). The runtime now has this information, queried from the OS during runtime init, so make syscall.Getpagesize return the page size that the runtime knows. Updates #10180. Change-Id: I4daa6fbc61a2193eb8fa9e7878960971205ac346 Reviewed-on: https://go-review.googlesource.com/25051 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
60 lines
1.3 KiB
Go
60 lines
1.3 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 (
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"runtime/internal/atomic"
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_ "unsafe" // for go:linkname
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)
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//go:generate go run wincallback.go
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//go:generate go run mkduff.go
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//go:generate go run mkfastlog2table.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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// Note: Called by runtime/pprof in addition to runtime code.
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func tickspersecond() int64 {
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r := int64(atomic.Load64(&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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atomic.Store64(&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 syscall_Getpagesize syscall.Getpagesize
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func syscall_Getpagesize() int { return int(physPageSize) }
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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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