| // Copyright 2015 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 | |
| const ( | |
| _AT_NULL = 0 | |
| _AT_RANDOM = 25 // introduced in 2.6.29 | |
| ) | |
| var randomNumber uint32 | |
| //go:nosplit | |
| func cputicks() int64 { | |
| // Currently cputicks() is used in blocking profiler and to seed fastrand1(). | |
| // nanotime() is a poor approximation of CPU ticks that is enough for the profiler. | |
| // randomNumber provides better seeding of fastrand1. | |
| return nanotime() + int64(randomNumber) | |
| } |