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Source file src/runtime/runtime.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
  
  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 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...) }
  

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