// have a self-steal here potentially that doesn't make
	// sense.
	b1 := g.Batch(trace.ThreadID(0), 0)
	b1.Event("ProcStatus", trace.ProcID(1), go122.ProcIdle)
	b1.Event("ProcStart", trace.ProcID(1), testgen.Seq(1))
	b1.Event("ProcSteal", trace.ProcID(0), testgen.Seq(3), trace.ThreadID(0))

	}
	return GoID(r.id)
}

// Proc obtains a ProcID from the resource ID.
//
// r.Kind must be ResourceProc or this function will panic.
func (r ResourceID) Proc() ProcID {
	if r.Kind != ResourceProc {
		panic(fmt.Sprintf("attempted to get ProcID from %s resource ID", r.Kind))
	}
	return ProcID(r.id)
}

// Thread obtains a ThreadID from the resource ID.
//

	g := t.Generation(1)

	// Steal proc from a goroutine that's been blocked
	// in a syscall the entire generation.
	b0 := g.Batch(trace.ThreadID(0), 0)
	b0.Event("ProcStatus", trace.ProcID(0), go122.ProcSyscallAbandoned)
	b0.Event("ProcSteal", trace.ProcID(0), testgen.Seq(1), trace.ThreadID(1))

	// Status event for a goroutine blocked in a syscall for the entire generation.
	bz := g.Batch(trace.NoThread, 0)

	b0.Event("GoSyscallEndBlocked")

	// A running goroutine steals proc 0.
	b1 := g.Batch(trace.ThreadID(1), 0)
	b1.Event("ProcStatus", trace.ProcID(2), go122.ProcRunning)
	b1.Event("GoStatus", trace.GoID(2), trace.ThreadID(1), go122.GoRunning)
	b1.Event("ProcSteal", trace.ProcID(0), testgen.Seq(3), trace.ThreadID(0))

	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("GoSyscallEndBlocked")

	// A bare M steals the goroutine's P.
	b1 := g.Batch(trace.ThreadID(1), 0)
	b1.Event("ProcSteal", trace.ProcID(0), testgen.Seq(2), trace.ThreadID(0))

)

func main() {
	testgen.Main(gen)
}

func gen(t *testgen.Trace) {
	g1 := t.Generation(1)

	// A running goroutine emits a task begin.
	b1 := g1.Batch(trace.ThreadID(0), 0)
	b1.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning)
	b1.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoRunning)
	b1.Event("UserTaskBegin", trace.TaskID(2), trace.TaskID(0) /* 0 means no parent, not background */, "my task", testgen.NoStack)

	// possible on other platforms, however.
	b0 := g.Batch(trace.ThreadID(0), 0)
	b0.Event("GoCreateSyscall", trace.GoID(4))
	b0.Event("ProcStatus", trace.ProcID(0), go122.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")

	testgen.Main(gen)
}

func gen(t *testgen.Trace) {
	g1 := t.Generation(1)

	// A goroutine gets created on a running P, then starts running.
	b0 := g1.Batch(trace.ThreadID(0), 0)
	b0.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning)
	b0.Event("GoCreate", trace.GoID(5), testgen.NoStack, testgen.NoStack)
	b0.Event("GoStart", trace.GoID(5), testgen.Seq(1))
	b0.Event("GoStop", "whatever", testgen.NoStack)

// the full requested amount.
// Whatever entropy r already contained is preserved.
func readTimeRandom(r []byte) {
	// Inspired by wyrand.
	// An earlier version of this code used getg().m.procid as well,
	// but note that this is called so early in startup that procid
	// is not initialized yet.
	v := uint64(nanotime())
	for len(r) > 0 {
		v ^= 0xa0761d6478bd642f
		v *= 0xe7037ed1a0b428db
		size := 8
		if len(r) < 8 {
			size = len(r)

var ArgTypes = [...]string{
	"seq",     // sequence number
	"pstatus", // P status
	"gstatus", // G status
	"g",       // trace.GoID
	"m",       // trace.ThreadID
	"p",       // trace.ProcID
	"string",  // string ID
	"stack",   // stack ID
	"value",   // uint64
	"task",    // trace.TaskID
}

// Names is a helper that produces a mapping of event names to event types.