mirror of https://github.com/nocturn9x/giambio.git
Moved the queueing mechanism to use events instead of event loop hacks
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51d01ba44e
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@ -34,8 +34,9 @@ class Event:
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self.set = False
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self.waiters = set()
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self.value = None
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async def trigger(self):
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async def trigger(self, value: Optional[Any] = None):
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"""
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Sets the event, waking up all tasks that called
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pause() on it
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@ -43,6 +44,7 @@ class Event:
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if self.set:
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raise GiambioError("The event has already been set")
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self.value = value
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await event_set(self)
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async def wait(self):
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@ -50,15 +52,15 @@ class Event:
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Waits until the event is set
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"""
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await event_wait(self)
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return await event_wait(self)
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class Queue:
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"""
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An asynchronous FIFO queue similar to asyncio.Queue
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that uses a collections.deque object for the underlying
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data representation. This queue is *NOT* thread-safe
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data representation. This queue is *NOT* thread-safe as
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it is based on giambio's Event mechanism
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"""
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def __init__(self, maxsize: Optional[int] = None):
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@ -80,23 +82,12 @@ class Queue:
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"""
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if not self.maxsize or len(self.container) < self.maxsize:
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self.container.append(item)
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if self.getters:
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task = self.getters.popleft()
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loop = await current_loop()
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loop._data[task] = item
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await schedule_tasks([task])
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else:
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# We pop in an else block instead of
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# always doing it because
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# by setting loop._data[task]
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# to the item we've already
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# kind of returned it and if
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# we also appended it to the deque
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# it would be as if it was added twice
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self.container.append(item)
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await self.getters.popleft().trigger(self.container.popleft())
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else:
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self.putters.append(await current_task())
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await suspend()
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self.putters.append(Event())
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await self.putters[-1].wait()
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async def get(self) -> Any:
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@ -108,8 +99,8 @@ class Queue:
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if self.container:
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if self.putters:
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await schedule_tasks([self.putters.popleft()])
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await self.putters.popleft().trigger()
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return self.container.popleft()
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else:
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self.getters.append(await current_task())
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return await suspend()
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self.getters.append(Event())
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return await self.getters[-1].wait()
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@ -195,7 +195,7 @@ async def event_wait(event):
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return
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task = await current_task()
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event.waiters.add(task)
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await create_trap("suspend")
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return await create_trap("suspend")
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async def event_set(event):
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@ -205,4 +205,7 @@ async def event_set(event):
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"""
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event.set = True
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loop = await current_loop()
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for waiter in event.waiters:
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loop._data[waiter] = event.value
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await schedule_tasks(event.waiters)
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@ -8,9 +8,9 @@ import giambio
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async def child(ev: giambio.Event, pause: int):
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print("[child] Child is alive! Going to wait until notified")
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start_total = giambio.clock()
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await ev.wait()
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data = await ev.wait()
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end_pause = giambio.clock() - start_total
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print(f"[child] Parent set the event, exiting in {pause} seconds")
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print(f"[child] Parent set the event with value {data}, exiting in {pause} seconds")
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start_sleep = giambio.clock()
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await giambio.sleep(pause)
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end_sleep = giambio.clock() - start_sleep
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@ -26,7 +26,7 @@ async def parent(pause: int = 1):
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start = giambio.clock()
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print(f"[parent] Sleeping {pause} second(s) before setting the event")
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await giambio.sleep(pause)
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await event.trigger()
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await event.trigger(True)
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print("[parent] Event set, awaiting child completion")
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end = giambio.clock() - start
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print(f"[parent] Child exited in {end:.2f} seconds")
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@ -6,7 +6,6 @@ async def producer(q: giambio.Queue, n: int):
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for i in range(n):
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await q.put(i)
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print(f"Produced {i}")
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await giambio.sleep(1)
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await q.put(None)
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print("Producer done")
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@ -18,6 +17,7 @@ async def consumer(q: giambio.Queue):
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print("Consumer done")
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break
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print(f"Consumed {item}")
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await giambio.sleep(1)
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