| // Copyright 2023 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // Tests syscall P stealing. |
| // |
| // Specifically, it tests a scenario where a thread 'steals' |
| // a P from itself. It's just a ProcStop with extra steps when |
| // it happens on the same P. |
| |
| package main |
| |
| import ( |
| "internal/trace/v2" |
| "internal/trace/v2/event/go122" |
| testgen "internal/trace/v2/internal/testgen/go122" |
| ) |
| |
| func main() { |
| testgen.Main(gen) |
| } |
| |
| func gen(t *testgen.Trace) { |
| t.DisableTimestamps() |
| |
| g := t.Generation(1) |
| |
| // A goroutine execute a syscall and steals its own P, then starts running |
| // on that P. |
| b0 := g.Batch(trace.ThreadID(0), 0) |
| b0.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning) |
| b0.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoRunning) |
| b0.Event("GoSyscallBegin", testgen.Seq(1), testgen.NoStack) |
| b0.Event("ProcSteal", trace.ProcID(0), testgen.Seq(2), trace.ThreadID(0)) |
| b0.Event("ProcStart", trace.ProcID(0), testgen.Seq(3)) |
| b0.Event("GoSyscallEndBlocked") |
| } |
