go122-task-across-generations.go

Documentation: golang.org/x/exp/trace/testdata/generators

     1  // Copyright 2023 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  // Code generated by "gen.bash" from internal/trace/v2; DO NOT EDIT.
     6  
     7  //go:build go1.21
     8  
     9  // Regression test for an issue found in development.
    10  //
    11  // The issue is that EvUserTaskEnd events don't carry the
    12  // task type with them, so the parser needs to track that
    13  // information. But if the parser just tracks the string ID
    14  // and not the string itself, that string ID may not be valid
    15  // for use in future generations.
    16  
    17  package main
    18  
    19  import (
    20  	"golang.org/x/exp/trace"
    21  	"golang.org/x/exp/trace/internal/event/go122"
    22  	testgen "golang.org/x/exp/trace/internal/testgen/go122"
    23  )
    24  
    25  func main() {
    26  	testgen.Main(gen)
    27  }
    28  
    29  func gen(t *testgen.Trace) {
    30  	g1 := t.Generation(1)
    31  
    32  	// A running goroutine emits a task begin.
    33  	b1 := g1.Batch(trace.ThreadID(0), 0)
    34  	b1.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning)
    35  	b1.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoRunning)
    36  	b1.Event("UserTaskBegin", trace.TaskID(2), trace.TaskID(0) /* 0 means no parent, not background */, "my task", testgen.NoStack)
    37  
    38  	g2 := t.Generation(2)
    39  
    40  	// That same goroutine emits a task end in the following generation.
    41  	b2 := g2.Batch(trace.ThreadID(0), 5)
    42  	b2.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning)
    43  	b2.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoRunning)
    44  	b2.Event("UserTaskEnd", trace.TaskID(2), testgen.NoStack)
    45  }
    46
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