mirror of https://github.com/golang/go.git
53 lines
1.7 KiB
Go
53 lines
1.7 KiB
Go
// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Tests a G being created from within a syscall.
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//
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// Specifically, it tests a scenario wherein a C
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// thread is calling into Go, creating a goroutine in
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// a syscall (in the tracer's model). Because the actual
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// m can be reused, it's possible for that m to have never
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// had its P (in _Psyscall) stolen if the runtime doesn't
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// model the scenario correctly. Make sure we reject such
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// traces.
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package main
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import (
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"internal/trace"
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"internal/trace/event/go122"
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testgen "internal/trace/internal/testgen/go122"
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)
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func main() {
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testgen.Main(gen)
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}
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func gen(t *testgen.Trace) {
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t.ExpectFailure(".*expected a proc but didn't have one.*")
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g := t.Generation(1)
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// A C thread calls into Go and acquires a P. It returns
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// back to C, destroying the G. It then comes back to Go
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// on the same thread and again returns to C.
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//
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// Note: on pthread platforms this can't happen on the
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// same thread because the m is stashed in TLS between
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// calls into Go, until the thread dies. This is still
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// possible on other platforms, however.
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b0 := g.Batch(trace.ThreadID(0), 0)
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b0.Event("GoCreateSyscall", trace.GoID(4))
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b0.Event("ProcStatus", trace.ProcID(0), go122.ProcIdle)
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b0.Event("ProcStart", trace.ProcID(0), testgen.Seq(1))
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b0.Event("GoSyscallEndBlocked")
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b0.Event("GoStart", trace.GoID(4), testgen.Seq(1))
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b0.Event("GoSyscallBegin", testgen.Seq(2), testgen.NoStack)
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b0.Event("GoDestroySyscall")
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b0.Event("GoCreateSyscall", trace.GoID(4))
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b0.Event("GoSyscallEnd")
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b0.Event("GoSyscallBegin", testgen.Seq(3), testgen.NoStack)
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b0.Event("GoDestroySyscall")
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}
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