roughtime.googlesource.com/roughtime.git@v0.0.0-20201210012726-dd529367052d/go/client/monotime/monotime.go (about) 1 // Copyright 2016 The Roughtime Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. */ 14 15 // Package monotime provides access to the system's monotonic clock. 16 package monotime 17 18 import ( 19 "unsafe" 20 "time" 21 ) 22 23 var _ = unsafe.Sizeof(0) 24 25 //go:noescape 26 //go:linkname nanotime runtime.nanotime 27 func nanotime() int64 28 29 // Now returns the monotonic duration since an unspecified epoch. 30 func Now() time.Duration { 31 return time.Duration(nanotime()) * time.Nanosecond 32 }