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Keeping the scanout running reasonably means keeping interrupt latency
constant, and that requires leaving the CPU running. Don't wait for
interrupts when the system is running in this mode.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Keith Packard <keithp@keithp.com>
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Add the timeout value and task id
Signed-off-by: Keith Packard <keithp@keithp.com>
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ao_delay() is implemented on top of ao_sleep_for, and ao_sleep_for
uses the timeout value of 0 to indicate an infinite timeout. Calls to
ao_delay for 0 ticks would unintentionally hit this case and end up
waiting forever.x
Signed-off-by: Keith Packard <keithp@keithp.com>
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List manipulation operations are not atomic, so interrupts need to be
blocked while changing them.
Signed-off-by: Keith Packard <keithp@keithp.com>
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The comment got moved to the wrong place
Signed-off-by: Keith Packard <keithp@keithp.com>
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Interrupts may not be blocked in the timer ISR, but they need to be
while walking the pending timer list and moving tasks back to the run
queue.
Signed-off-by: Keith Packard <keithp@keithp.com>
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sdcc can't handle this.
Signed-off-by: Keith Packard <keithp@keithp.com>
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We use a separate stack pointer for task code, which means we can
verify that it is in range in any interrupt handler. This adds checks
for the task stack (under #ifdef DEBUG) that run in ao_wakeup as well
as at every timer interrupt.
Signed-off-by: Keith Packard <keithp@keithp.com>
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sdcc won't embed these itself, and thus consumes too much flash for
telemetrum-v1.0
Signed-off-by: Keith Packard <keithp@keithp.com>
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Having arbitrary alarms firing in the middle of complicated device
logic makes no sense at all. Therefore only correct use of ao_alarm
and ao_clear_alarm was around a specific ao_sleep call, with correct
recovery in case the alarm fires.
This patch replaces all uses of ao_alarm/ao_sleep/ao_clear_alarm with
ao_sleep_for, a new function which takes the alarm timeout directly.
A few cases which weren't simply calling ao_sleep have been reworked
to pass the timeout value down to the place where sleep *is* being
called, and having that code deal with the return correctly.
Signed-off-by: Keith Packard <keithp@keithp.com>
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core remains a bad name to use -- dirvish skips files (and
directories, it seems) with that name.
Signed-off-by: Keith Packard <keithp@keithp.com>
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