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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// Tests syscall P stealing at a generation boundary.
6
7package main
8
9import (
10	"internal/trace"
11	"internal/trace/event/go122"
12	testgen "internal/trace/internal/testgen/go122"
13)
14
15func main() {
16	testgen.Main(gen)
17}
18
19func gen(t *testgen.Trace) {
20	g := t.Generation(1)
21
22	// One goroutine is exiting with a syscall. It already
23	// acquired a new P.
24	b0 := g.Batch(trace.ThreadID(0), 0)
25	b0.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoSyscall)
26	b0.Event("ProcStatus", trace.ProcID(1), go122.ProcIdle)
27	b0.Event("ProcStart", trace.ProcID(1), testgen.Seq(1))
28	b0.Event("GoSyscallEndBlocked")
29
30	// A running goroutine stole P0 at the generation boundary.
31	b1 := g.Batch(trace.ThreadID(1), 0)
32	b1.Event("ProcStatus", trace.ProcID(2), go122.ProcRunning)
33	b1.Event("GoStatus", trace.GoID(2), trace.ThreadID(1), go122.GoRunning)
34	b1.Event("ProcStatus", trace.ProcID(0), go122.ProcSyscallAbandoned)
35	b1.Event("ProcSteal", trace.ProcID(0), testgen.Seq(1), trace.ThreadID(0))
36}
37