37 lines
1.2 KiB
Go
37 lines
1.2 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package pprof
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import (
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"context"
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"unsafe"
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)
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// runtime_setProfLabel is defined in runtime/proflabel.go.
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func runtime_setProfLabel(labels unsafe.Pointer)
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// runtime_getProfLabel is defined in runtime/proflabel.go.
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func runtime_getProfLabel() unsafe.Pointer
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// SetGoroutineLabels sets the current goroutine's labels to match ctx.
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// This is a lower-level API than Do, which should be used instead when possible.
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func SetGoroutineLabels(ctx context.Context) {
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ctxLabels, _ := ctx.Value(labelContextKey{}).(*labelMap)
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runtime_setProfLabel(unsafe.Pointer(ctxLabels))
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}
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// Do calls f with a copy of the parent context with the
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// given labels added to the parent's label map.
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// Each key/value pair in labels is inserted into the label map in the
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// order provided, overriding any previous value for the same key.
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// The augmented label map will be set for the duration of the call to f
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// and restored once f returns.
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func Do(ctx context.Context, labels LabelSet, f func(context.Context)) {
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defer SetGoroutineLabels(ctx)
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ctx = WithLabels(ctx, labels)
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SetGoroutineLabels(ctx)
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f(ctx)
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}
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