go122-syscall-steal-proc-self.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  // Tests syscall P stealing.
    10  //
    11  // Specifically, it tests a scenario where a thread 'steals'
    12  // a P from itself. It's just a ProcStop with extra steps when
    13  // it happens on the same P.
    14  
    15  package main
    16  
    17  import (
    18  	"golang.org/x/exp/trace"
    19  	"golang.org/x/exp/trace/internal/event/go122"
    20  	testgen "golang.org/x/exp/trace/internal/testgen/go122"
    21  )
    22  
    23  func main() {
    24  	testgen.Main(gen)
    25  }
    26  
    27  func gen(t *testgen.Trace) {
    28  	t.DisableTimestamps()
    29  
    30  	g := t.Generation(1)
    31  
    32  	// A goroutine execute a syscall and steals its own P, then starts running
    33  	// on that P.
    34  	b0 := g.Batch(trace.ThreadID(0), 0)
    35  	b0.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning)
    36  	b0.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoRunning)
    37  	b0.Event("GoSyscallBegin", testgen.Seq(1), testgen.NoStack)
    38  	b0.Event("ProcSteal", trace.ProcID(0), testgen.Seq(2), trace.ThreadID(0))
    39  	b0.Event("ProcStart", trace.ProcID(0), testgen.Seq(3))
    40  	b0.Event("GoSyscallEndBlocked")
    41  }
    42
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