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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package runtime
import (
"runtime/internal/atomic"
_ "unsafe" // for go:linkname
)
//go:generate go run wincallback.go
//go:generate go run mkduff.go
//go:generate go run mkfastlog2table.go
// For gccgo, while we still have C runtime code, use go:linkname to
// export some functions.
//
//go:linkname tickspersecond
var ticksLock mutex
var ticksVal uint64
// Note: Called by runtime/pprof in addition to runtime code.
func tickspersecond() int64 {
r := int64(atomic.Load64(&ticksVal))
if r != 0 {
return r
}
lock(&ticksLock)
r = int64(ticksVal)
if r == 0 {
t0 := nanotime()
c0 := cputicks()
usleep(100 * 1000)
t1 := nanotime()
c1 := cputicks()
if t1 == t0 {
t1++
}
r = (c1 - c0) * 1000 * 1000 * 1000 / (t1 - t0)
if r == 0 {
r++
}
atomic.Store64(&ticksVal, uint64(r))
}
unlock(&ticksLock)
return r
}
var envs []string
var argslice []string
//go:linkname syscall_runtime_envs syscall.runtime_envs
func syscall_runtime_envs() []string { return append([]string{}, envs...) }
//go:linkname syscall_Getpagesize syscall.Getpagesize
func syscall_Getpagesize() int { return int(physPageSize) }
//go:linkname os_runtime_args os.runtime_args
func os_runtime_args() []string { return append([]string{}, argslice...) }
//go:linkname syscall_Exit syscall.Exit
//go:nosplit
func syscall_Exit(code int) {
exit(int32(code))
}
// Temporary, for the gccgo runtime code written in C.
//go:linkname get_envs runtime_get_envs
func get_envs() []string { return envs }
//go:linkname get_args runtime_get_args
func get_args() []string { return argslice }
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