70 lines
1.6 KiB
Go
70 lines
1.6 KiB
Go
|
// 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
|
||
|
|
// rename some functions to themselves, so that the compiler will
|
||
|
|
// export them.
|
||
|
|
//
|
||
|
|
//go:linkname tickspersecond runtime.tickspersecond
|
||
|
|
|
||
|
|
var ticks struct {
|
||
|
|
lock mutex
|
||
|
|
pad uint32 // ensure 8-byte alignment of val on 386
|
||
|
|
val uint64
|
||
|
|
}
|
||
|
|
|
||
|
|
// Note: Called by runtime/pprof in addition to runtime code.
|
||
|
|
func tickspersecond() int64 {
|
||
|
|
r := int64(atomic.Load64(&ticks.val))
|
||
|
|
if r != 0 {
|
||
|
|
return r
|
||
|
|
}
|
||
|
|
lock(&ticks.lock)
|
||
|
|
r = int64(ticks.val)
|
||
|
|
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(&ticks.val, uint64(r))
|
||
|
|
}
|
||
|
|
unlock(&ticks.lock)
|
||
|
|
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 os_runtime_args os.runtime_args
|
||
|
|
func os_runtime_args() []string { return append([]string{}, argslice...) }
|
||
|
|
|
||
|
|
// 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 }
|