mirror of https://github.com/prometheus/prometheus
35 lines
1.1 KiB
Go
35 lines
1.1 KiB
Go
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// Copyright 2015 Peter Mattis.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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// implied. See the License for the specific language governing
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// permissions and limitations under the License. See the AUTHORS file
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// for names of contributors.
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// +build go1.4,!go1.5
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package goid
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import "unsafe"
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var pointerSize = unsafe.Sizeof(uintptr(0))
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// Backdoor access to runtime·getg().
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func getg() uintptr // in goid_go1.4.s
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// Get returns the id of the current goroutine.
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func Get() int64 {
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// The goid is the 16th field in the G struct where each field is a
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// pointer, uintptr or padded to that size. See runtime.h from the
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// Go sources. I'm not aware of a cleaner way to determine the
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// offset.
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return *(*int64)(unsafe.Pointer(getg() + 16*pointerSize))
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}
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