PL_EVENT_SIGNAL
pl.pl_event = PL_EVENT_SIGNAL;
FORKEE_ASSERT_EQ(lwp.pl_event, PL_EVENT_SIGNAL);
PL_EVENT_SIGNAL : PL_EVENT_NONE);
FORKEE_ASSERT_EQ(lwp.pl_event, PL_EVENT_SIGNAL);
PL_EVENT_SIGNAL : PL_EVENT_NONE);