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Source file src/runtime/pprof/runtime.go

Documentation: runtime/pprof

     1  // Copyright 2017 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package pprof
     6  
     7  import (
     8  	"context"
     9  	"unsafe"
    10  )
    11  
    12  // runtime_setProfLabel is defined in runtime/proflabel.go.
    13  func runtime_setProfLabel(labels unsafe.Pointer)
    14  
    15  // runtime_getProfLabel is defined in runtime/proflabel.go.
    16  func runtime_getProfLabel() unsafe.Pointer
    17  
    18  // SetGoroutineLabels sets the current goroutine's labels to match ctx.
    19  // This is a lower-level API than Do, which should be used instead when possible.
    20  func SetGoroutineLabels(ctx context.Context) {
    21  	ctxLabels, _ := ctx.Value(labelContextKey{}).(*labelMap)
    22  	runtime_setProfLabel(unsafe.Pointer(ctxLabels))
    23  }
    24  
    25  // Do calls f with a copy of the parent context with the
    26  // given labels added to the parent's label map.
    27  // Each key/value pair in labels is inserted into the label map in the
    28  // order provided, overriding any previous value for the same key.
    29  // The augmented label map will be set for the duration of the call to f
    30  // and restored once f returns.
    31  func Do(ctx context.Context, labels LabelSet, f func(context.Context)) {
    32  	defer SetGoroutineLabels(ctx)
    33  	ctx = WithLabels(ctx, labels)
    34  	SetGoroutineLabels(ctx)
    35  	f(ctx)
    36  }
    37  

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