rework the event loop
This commit is contained in:
Jan Pochyla
Pavol Rusnak
parent
71496913ba
commit
e7bfb64502
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@ -1,16 +1,79 @@
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import utime
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import uheapq
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from uheapq import heappop, heappush
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from .utils import type_gen
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from . import msg
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from . import ui
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import log
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q = []
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cnt = 0
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EVT_TSTART = const(-1)
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EVT_TMOVE = const(-2)
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EVT_TEND = const(-3)
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EVT_MSG = const(-4)
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evt_handlers = { EVT_TSTART: None,
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EVT_TMOVE: None,
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EVT_TEND: None,
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EVT_MSG: None, }
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time_queue = []
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def run_forever():
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delay_max = const(1000000)
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while True:
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if time_queue:
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t, _, _ = time_queue[0]
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delay = t - utime.ticks_us()
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else:
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delay = delay_max
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event = wait_for_event(delay)
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if event:
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# run interrupt handler
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raise NotImplementedError()
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else:
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# run something from the time queue
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_, gen, args = heappop(time_queue)
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try:
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if not args:
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args = (None,)
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ret = gen.send(*args)
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except StopIteration as e:
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# gen ended, forget it and go on
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continue
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if isinstance(ret, type_gen):
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# generator, run it and call us asap
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call_at(None, ret)
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call_at(None, gen, *args)
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elif isinstance(ret, int):
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if ret >= 0:
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# sleep in microseconds, call us later
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call_at(utime.ticks_us() + ret, gen, *args)
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else:
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# wait for event
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raise NotImplementedError()
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elif ret is None:
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# just call us asap
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call_at(None, gen, *args)
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def call_at(time, gen, *args):
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if __debug__:
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log.debug("Scheduling %s", (time, gen, args))
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if not time:
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time = utime.ticks_us()
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heappush(time_queue, (time, gen, args))
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# For performance stats
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if __debug__:
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# For performance stats
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import array
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@ -18,149 +81,20 @@ if __debug__:
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log_delay_rb_len = const(10)
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log_delay_rb = array.array('i', [0] * log_delay_rb_len)
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def call_soon(callback, *args):
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call_at(0, callback, *args)
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def call_later(delay, callback, *args):
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call_at(utime.ticks_us() + delay, callback, *args)
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def call_at(time, callback, *args):
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global cnt
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if __debug__:
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log.debug("Scheduling %s", (int(time), cnt, callback, args))
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# Including self.cnt is a workaround per heapq docs
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uheapq.heappush(q, (int(time), cnt, callback, args))
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cnt += 1
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def wait(delay):
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def wait_for_event(timeout_us):
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if __debug__:
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# Adding delay to ring buffer for performance stats
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global log_delay_pos
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global log_delay_rb
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global log_delay_rb_len
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log_delay_rb[log_delay_pos] = delay
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log_delay_rb[log_delay_pos] = timeout_us
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log_delay_pos = (log_delay_pos + 1) % log_delay_rb_len
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m = msg.select(delay)
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if m:
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event = msg.select(timeout_us)
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if event:
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# print('msg:', m)
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# utime.sleep_us(10000)
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if m[0] == 2:
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ui.display.bar(m[1], m[2], 2, 2, ui.BLACK)
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return m
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def run_forever():
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global q, cnt
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while True:
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if q:
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t, cnt, cb, args = uheapq.heappop(q)
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if __debug__:
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log.debug("Next coroutine to run: %s", (t, cnt, cb, args))
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tnow = utime.ticks_us()
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delay = t - tnow
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if delay > 0:
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m = wait(delay)
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else:
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m = wait(0)
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# Assuming IO completion scheduled some tasks
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continue
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if callable(cb):
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ret = cb(*args)
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if __debug__ and isinstance(ret, type_gen):
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log.warning("Callback produced generator, which will never run.")
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else:
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delay = 0
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try:
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if args == ():
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args = (None,)
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if __debug__:
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log.debug("Coroutine %s send args: %s", cb, args)
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ret = cb.send(*args)
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if __debug__:
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log.debug("Coroutine %s yield result: %s", cb, ret)
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if isinstance(ret, SysCall1):
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arg = ret.arg
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if isinstance(ret, Sleep):
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delay = arg
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elif isinstance(ret, StopLoop):
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return arg
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# elif isinstance(ret, IORead):
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# self.add_reader(arg.fileno(), lambda self, c, f: self.call_soon(c, f), self, cb, arg)
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# self.add_reader(arg.fileno(), lambda c, f: self.call_soon(c, f), cb, arg)
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# self.add_reader(arg.fileno(), lambda cb: self.call_soon(cb), cb)
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# self.add_reader(arg.fileno(), cb)
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# continue
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# elif isinstance(ret, IOWrite):
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# self.add_writer(arg.fileno(), lambda cb: self.call_soon(cb), cb)
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# self.add_writer(arg.fileno(), cb)
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# continue
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# elif isinstance(ret, IOReadDone):
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# self.remove_reader(arg.fileno())
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# elif isinstance(ret, IOWriteDone):
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# self.remove_writer(arg.fileno())
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elif isinstance(ret, type_gen):
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call_soon(ret)
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elif ret is None:
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# Just reschedule
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pass
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else:
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assert False, "Unsupported yield value: %r (of type %r)" % (ret, type(ret))
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except StopIteration as e:
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if __debug__:
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log.debug("Coroutine finished: %s", cb)
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continue
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call_later(delay, cb, *args)
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# def run_until_complete(self, coro):
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# def _run_and_stop():
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# yield from coro
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# yield StopLoop(0)
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# self.call_soon(_run_and_stop())
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# self.run_forever()
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# class SysCall:
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# def __init__(self, *args):
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# self.args = args
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# def handle(self):
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# raise NotImplementedError
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# Optimized syscall with 1 arg
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class SysCall1:
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def __init__(self, arg):
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self.arg = arg
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def handle(self):
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raise NotImplementedError
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#class IOButton(SysCall):
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# pass
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class StopLoop(SysCall1):
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pass
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class Sleep(SysCall1):
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pass
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# class IORead(SysCall1):
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# pass
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# class IOWrite(SysCall1):
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# pass
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# class IOReadDone(SysCall1):
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# pass
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# class IOWriteDone(SysCall1):
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# pass
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# _event_loop = None
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# _event_loop_class = EventLoop
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# def get_event_loop():
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# global _event_loop
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# if _event_loop is None:
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# _event_loop = _event_loop_class()
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# return _event_loop
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if event[0] == 2:
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ui.display.bar(event[1], event[2], 2, 2, ui.BLACK)
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return event
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