DTRACE_ACTIVITY_DRAINING
state->dts_activity == DTRACE_ACTIVITY_DRAINING);
state->dts_activity != DTRACE_ACTIVITY_DRAINING)
state->dts_activity = DTRACE_ACTIVITY_DRAINING;
state->dts_activity == DTRACE_ACTIVITY_DRAINING) {
if (state->dts_activity == DTRACE_ACTIVITY_DRAINING)
DTRACE_ACTIVITY_DRAINING);
DTRACE_ACTIVITY_DRAINING) != current) {