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erts: Skip pollset update on scheduler-polled re-arm #11525

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erts: Skip pollset update on scheduler-polled re-arm #11525

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11 changes: 11 additions & 0 deletions erts/emulator/sys/common/erl_check_io.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1409,6 +1409,17 @@ enif_select_x(ErlNifEnv* env,
#endif
}

#if ERTS_POLL_USE_SCHEDULER_POLLING
if (on && ctl_op == ERTS_POLL_OP_MOD && ctl_events == ERTS_POLL_EV_IN
&& state->flags & ERTS_EV_FLAG_IN_SCHEDULER) {
/* Re-arming a read select on an fd that is still registered
* for IN in the scheduler pollset. Neither pollset changes:
* IN stays enabled where it is, and the events carried by the
* normal pollset are not touched by this call. */
new_events = state->active_events;
}
else
#endif
if (ctl_events || ctl_op == ERTS_POLL_OP_DEL) {

new_events = erts_io_control_wakeup(state,
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