github.com/zxy12/golang_with_comment@v0.0.0-20190701084843-0e6b2aff5ef3/runtime/os_darwin_arm64.go (about)

     1  // Copyright 2014 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package runtime
     6  
     7  var supportCRC32 = false
     8  
     9  //go:nosplit
    10  func cputicks() int64 {
    11  	// Currently cputicks() is used in blocking profiler and to seed runtime·fastrand().
    12  	// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
    13  	// TODO: need more entropy to better seed fastrand.
    14  	return nanotime()
    15  }