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Source file src/runtime/pprof/runtime.go

Documentation: runtime/pprof

  // Copyright 2017 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 pprof
  
  import (
  	"context"
  	"unsafe"
  )
  
  // runtime_setProfLabel is defined in runtime/proflabel.go.
  func runtime_setProfLabel(labels unsafe.Pointer)
  
  // runtime_getProfLabel is defined in runtime/proflabel.go.
  func runtime_getProfLabel() unsafe.Pointer
  
  // SetGoroutineLabels sets the current goroutine's labels to match ctx.
  // This is a lower-level API than Do, which should be used instead when possible.
  func SetGoroutineLabels(ctx context.Context) {
  	ctxLabels, _ := ctx.Value(labelContextKey{}).(*labelMap)
  	runtime_setProfLabel(unsafe.Pointer(ctxLabels))
  }
  
  // Do calls f with a copy of the parent context with the
  // given labels added to the parent's label map.
  // Each key/value pair in labels is inserted into the label map in the
  // order provided, overriding any previous value for the same key.
  // The augmented label map will be set for the duration of the call to f
  // and restored once f returns.
  func Do(ctx context.Context, labels LabelSet, f func(context.Context)) {
  	defer SetGoroutineLabels(ctx)
  	ctx = WithLabels(ctx, labels)
  	SetGoroutineLabels(ctx)
  	f(ctx)
  }
  

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