go122-go-create-without-running-g.go

Documentation: internal/trace/v2/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  // Regression test for an issue found in development.
     6  //
     7  // GoCreate events can happen on bare Ps in a variety of situations and
     8  // and earlier version of the parser assumed this wasn't possible. At
     9  // the time of writing, one such example is goroutines created by expiring
    10  // timers.
    11  
    12  package main
    13  
    14  import (
    15  	"internal/trace/v2"
    16  	"internal/trace/v2/event/go122"
    17  	testgen "internal/trace/v2/internal/testgen/go122"
    18  )
    19  
    20  func main() {
    21  	testgen.Main(gen)
    22  }
    23  
    24  func gen(t *testgen.Trace) {
    25  	g1 := t.Generation(1)
    26  
    27  	// A goroutine gets created on a running P, then starts running.
    28  	b0 := g1.Batch(trace.ThreadID(0), 0)
    29  	b0.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning)
    30  	b0.Event("GoCreate", trace.GoID(5), testgen.NoStack, testgen.NoStack)
    31  	b0.Event("GoStart", trace.GoID(5), testgen.Seq(1))
    32  	b0.Event("GoStop", "whatever", testgen.NoStack)
    33  }
    34

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