// Use Go to start 4 goroutines each of which handles 1/4 of the
	// board.
	r = GoStart(0, x, y, 0, x / 2, 0, y / 2, a, n);
	assert(r.r0 == 0 && r.r1 == 100);	// test multiple returns
	r = GoStart(1, x, y, x / 2, x, 0, y / 2, a, n);
	assert(r.r0 == 1 && r.r1 == 101);	// test multiple returns
	GoStart(2, x, y, 0, x / 2, y / 2, y, a, n);
	GoStart(3, x, y, x / 2, x, y / 2, y, a, n);
	GoWait(0);
	GoWait(1);
	GoWait(2);
	GoWait(3);
}

	// Use Go to start 4 goroutines each of which handles 1/4 of the
	// board.
	r = GoStart(0, x, y, 0, x / 2, 0, y / 2, a, n);
	assert(r.r0 == 0 && r.r1 == 100);	// test multiple returns
	r = GoStart(1, x, y, x / 2, x, 0, y / 2, a, n);
	assert(r.r0 == 1 && r.r1 == 101);	// test multiple returns
	GoStart(2, x, y, 0, x / 2, y / 2, y, a, n);
	GoStart(3, x, y, x / 2, x, y / 2, y, a, n);
	GoWait(0);
	GoWait(1);
	GoWait(2);
	GoWait(3);
}

	b11.Event("ProcStatus", trace.ProcID(1), go122.ProcRunning)
	b11.Event("GoStart", trace.GoID(1), testgen.Seq(1))
	b11.Event("GoStop", "whatever", testgen.NoStack)

	g2 := t.Generation(2)

	// Start running the goroutine, but later.
	b21 := g2.Batch(trace.ThreadID(1), 3)
	b21.Event("ProcStatus", trace.ProcID(1), go122.ProcRunning)
	b21.Event("GoStart", trace.GoID(1), testgen.Seq(2))

Strings
String id=1
	data="whatever"
EventBatch gen=2 m=1 time=3 size=8
ProcStatus dt=1 p=1 pstatus=1
GoStart dt=1 g=1 g_seq=2
EventBatch gen=2 m=0 time=5 size=17
ProcStatus dt=1 p=0 pstatus=1
GoStatus dt=1 g=1 m=0 gstatus=1
GoStart dt=1 g=1 g_seq=1
GoStop dt=1 reason_string=1 stack=0
EventBatch gen=2 m=18446744073709551615 time=0 size=5
Frequency freq=15625000
EventBatch gen=2 m=18446744073709551615 time=0 size=1

		copy(a, n)
	}
}

// Keep the channels visible from Go.
var chans [4]chan bool

// Double return value is just for testing.
//
//export GoStart
func GoStart(i, xdim, ydim, xstart, xend, ystart, yend C.int, a *C.int, n *C.int) (int, int) {
	c := make(chan bool, int(C.MYCONST))
	go func() {
		C.DoStep(xdim, ydim, xstart, xend, ystart, yend, a, n)
		c <- true
	}()

		copy(a, n)
	}
}

// Keep the channels visible from Go.
var chans [4]chan bool

// Double return value is just for testing.
//
//export GoStart
func GoStart(i, xdim, ydim, xstart, xend, ystart, yend C.int, a *C.int, n *C.int) (int, int) {
	c := make(chan bool, int(C.MYCONST))
	go func() {
		C.DoStep(xdim, ydim, xstart, xend, ystart, yend, a, n)
		c <- true
	}()

-- expect --
SUCCESS
-- trace --
Trace Go1.22
EventBatch gen=1 m=0 time=0 size=17
ProcStatus dt=1 p=0 pstatus=1
GoCreate dt=1 new_g=5 new_stack=0 stack=0
GoStart dt=1 g=5 g_seq=1
GoStop dt=1 reason_string=1 stack=0
EventBatch gen=1 m=18446744073709551615 time=0 size=5
Frequency freq=15625000
EventBatch gen=1 m=18446744073709551615 time=0 size=1
Stacks
EventBatch gen=1 m=18446744073709551615 time=0 size=12
Strings
String id=1

	n, err := r.r.Read(p)
	if n > 0 && r.off+int64(n) > r.start && r.off < r.end {
		cstart := r.start - r.off
		if cstart < 0 {
			cstart = 0
		}
		cend := r.end - r.off
		if cend > int64(n) {
			cend = int64(n)
		}
		zeros := make([]byte, cend-cstart)
		copy(p[cstart:cend], zeros)
	}
	r.off += int64(n)
	return n, err
}

FAILURE ".*expected a proc but didn't have one.*"
-- trace --
Trace Go1.22
EventBatch gen=1 m=0 time=0 size=34
GoCreateSyscall dt=1 new_g=4
ProcStatus dt=1 p=0 pstatus=2
ProcStart dt=1 p=0 p_seq=1
GoSyscallEndBlocked dt=1
GoStart dt=1 g=4 g_seq=1
GoSyscallBegin dt=1 p_seq=2 stack=0
GoDestroySyscall dt=1
GoCreateSyscall dt=1 new_g=4
GoSyscallEnd dt=1
GoSyscallBegin dt=1 p_seq=3 stack=0
GoDestroySyscall dt=1

Trace Go1.22
EventBatch gen=1 m=0 time=0 size=37
GoCreateSyscall dt=1 new_g=4
GoSyscallEndBlocked dt=1
ProcStatus dt=1 p=0 pstatus=2
ProcStart dt=1 p=0 p_seq=1
GoStatus dt=1 g=4 m=18446744073709551615 gstatus=1
GoStart dt=1 g=4 g_seq=1
GoSyscallBegin dt=1 p_seq=2 stack=0
GoDestroySyscall dt=1
EventBatch gen=1 m=0 time=0 size=13
ProcStatus dt=1 p=1 pstatus=2
ProcStart dt=1 p=1 p_seq=1
ProcSteal dt=1 p=0 p_seq=3 m=0