Commit Graph

17 Commits

Author SHA1 Message Date
David Lechner 259d9b69fe py/mpstate: Schedule KeyboardInterrupt on main thread.
This introduces a new macro to get the main thread and uses it to ensure
that asynchronous exceptions such as KeyboardInterrupt (CTRL+C) are only
scheduled on the main thread. This is more deterministic than being
scheduled on a random thread and is more in line with CPython that only
allow signal handlers to run on the main thread.

Fixes issue #7026.

Signed-off-by: David Lechner <david@pybricks.com>
2021-06-19 09:49:00 +10:00
David Lechner ca920f7218 py/mpstate: Make exceptions thread-local.
This moves mp_pending_exception from mp_state_vm_t to mp_state_thread_t.
This allows exceptions to be scheduled on a specific thread.

Signed-off-by: David Lechner <david@pybricks.com>
2021-06-19 09:43:44 +10:00
Damien George aa061ae391 py/scheduler: Add missing MICROPY_WRAP_MP_SCHED_EXCEPTION usage.
This was missed in commit 7cbf826a95.

Signed-off-by: Damien George <damien@micropython.org>
2021-05-01 23:10:26 +10:00
Damien George 916c3fd23f py/scheduler: Add optional port hook for when something is scheduled.
So that a port can "wake up" when there is work to do.

Signed-off-by: Damien George <damien@micropython.org>
2021-04-30 15:32:16 +10:00
Damien George e9e9c76ddf all: Rename mp_keyboard_interrupt to mp_sched_keyboard_interrupt.
To match mp_sched_exception() and mp_sched_schedule().

Signed-off-by: Damien George <damien@micropython.org>
2021-04-30 15:13:43 +10:00
Damien George 7cbf826a95 py/scheduler: Add mp_sched_exception() to schedule a pending exception.
This helper is added to properly set a pending exception, to mirror
mp_sched_schedule(), which schedules a function.

Signed-off-by: Damien George <damien@micropython.org>
2021-04-30 15:13:43 +10:00
Damien George f792e6c283 py/scheduler: Convert mp_sched_full and mp_sched_num_pending to macros.
So they are guaranteed to be inlined within functions like
mp_sched_schedule which may be located in a special memory region.
2020-05-08 23:20:45 +10:00
Damien George 544c308c18 py/scheduler: Add option to wrap mp_sched_schedule in arbitrary attr.
So ports can put it in a special memory section if needed.
2020-04-30 23:47:11 +10:00
Jim Mussared 8470cd0be9 py/scheduler: Add assert that scheduler is locked when unlocking.
And add a test that shows how this can happen when multiple threads are
accessing the scheduler, which fails if atomic sections are not used.
2020-04-13 21:55:47 +10:00
Jim Mussared 243805d776 py/scheduler: Fix race in checking scheduler pending state.
Because the atomic section starts after checking whether the scheduler
state is pending, it's possible it can become a different state by the time
the atomic section starts.

This is especially likely on ports where MICROPY_BEGIN_ATOMIC_SECTION is
implemented with a mutex (i.e. it might block), but the race exists
regardless, i.e. if a context switch occurs between those two lines.
2020-04-13 21:55:47 +10:00
Damien George abe2caf6df py/scheduler: Move clearing of kbd traceback to mp_keyboard_interrupt.
This is a more logical place to clear the KeyboardInterrupt traceback,
right before it is set as a pending exception.  The clearing is also
optimised from a function call to a simple store of NULL.
2020-02-07 16:08:31 +11:00
Damien George 8fb5c8fdd5 py/scheduler: Allow a port to specify attrs for mp_keyboard_interrupt.
Functions like mp_keyboard_interrupt() may need to be called from an IRQ
handler and may need to be in a special memory section, so provide a
generic wrapping macro for a port to do this.  The macro name is chosen to
be MICROPY_WRAP_<function name in uppercase> so that (in the future with
more wrappers) each function could potentially be handled separately.
2020-02-07 16:08:29 +11:00
Damien George 9efb36bfa6 py/scheduler: Move mp_keyboard_interrupt from lib/utils to py core.
This function is tightly coupled to the state and behaviour of the
scheduler, and is a core part of the runtime: to schedule a pending
exception.  So move it there.
2020-02-07 16:08:26 +11:00
Damien George 98a3911c43 py/scheduler: Add "raise_exc" argument to mp_handle_pending.
Previous behaviour is when this argument is set to "true", in which case
the function will raise any pending exception.  Setting it to "false" will
cancel any pending exception.
2020-02-07 16:08:20 +11:00
Jim Mussared bc66fe9064 py/scheduler: Rename sched_stack to sched_queue.
Behaviour was changed from stack to queue in
8977c7eb58, and this updates variable names
to match.  Also updates other references (docs, error messages).
2019-07-17 16:09:32 +10:00
Andrew Leech 8977c7eb58 py/scheduler: Convert micropythyon.schedule() to a circular buffer.
This means the schedule operates on a first-in, first-executed manner
rather than the current last-in, first executed.
2019-03-26 16:35:42 +11:00
Damien George 6e74d24f30 py: Add micropython.schedule() function and associated runtime code. 2017-03-20 15:20:26 +11:00