| // 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) |
| } |
