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libmicrokit: fix deferred signal dropping on reply #523

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Merged
midnightveil merged 1 commit into from
Jun 12, 2026
Merged

libmicrokit: fix deferred signal dropping on reply #523

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9 changes: 9 additions & 0 deletions libmicrokit/src/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,14 @@ static void run_init_funcs(void)
}
}

static void deferred_flush(void)
{
if (microkit_have_signal) {
seL4_Send(microkit_signal_cap, microkit_signal_msg);
microkit_have_signal = seL4_False;
}
}

static void handler_loop(void)
{
bool have_reply = false;
Expand Down Expand Up @@ -90,6 +98,7 @@ static void handler_loop(void)
seL4_MessageInfo_t tag;

if (have_reply) {
deferred_flush();
tag = seL4_ReplyRecv(INPUT_CAP, reply_tag, &badge, REPLY_CAP);
} else if (microkit_have_signal) {
tag = seL4_NBSendRecv(microkit_signal_cap, microkit_signal_msg, INPUT_CAP, &badge, REPLY_CAP);
Expand Down
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