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// 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.
// Code generated by "gen.bash" from internal/trace; DO NOT EDIT.
//go:build go1.23
// Tests a G being created from within a syscall.
//
// Specifically, it tests a scenario wherein a C
// thread is calling into Go, creating a goroutine in
// a syscall (in the tracer's model). Because the actual
// m can be reused, it's possible for that m to have never
// had its P (in _Psyscall) stolen if the runtime doesn't
// model the scenario correctly. Make sure we reject such
// traces.
package main
import (
"golang.org/x/exp/trace"
"golang.org/x/exp/trace/internal/testgen"
"golang.org/x/exp/trace/internal/tracev2"
"golang.org/x/exp/trace/internal/version"
)
func main() {
testgen.Main(version.Go122, gen)
}
func gen(t *testgen.Trace) {
t.ExpectFailure(".*expected a proc but didn't have one.*")
g := t.Generation(1)
// A C thread calls into Go and acquires a P. It returns
// back to C, destroying the G. It then comes back to Go
// on the same thread and again returns to C.
//
// Note: on pthread platforms this can't happen on the
// same thread because the m is stashed in TLS between
// calls into Go, until the thread dies. This is still
// possible on other platforms, however.
b0 := g.Batch(trace.ThreadID(0), 0)
b0.Event("GoCreateSyscall", trace.GoID(4))
b0.Event("ProcStatus", trace.ProcID(0), tracev2.ProcIdle)
b0.Event("ProcStart", trace.ProcID(0), testgen.Seq(1))
b0.Event("GoSyscallEndBlocked")
b0.Event("GoStart", trace.GoID(4), testgen.Seq(1))
b0.Event("GoSyscallBegin", testgen.Seq(2), testgen.NoStack)
b0.Event("GoDestroySyscall")
b0.Event("GoCreateSyscall", trace.GoID(4))
b0.Event("GoSyscallEnd")
b0.Event("GoSyscallBegin", testgen.Seq(3), testgen.NoStack)
b0.Event("GoDestroySyscall")
}
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