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# Test Event class
try:
import asyncio
except ImportError:
print("SKIP")
raise SystemExit
async def task(id, ev):
print("start", id)
print(await ev.wait())
print("end", id)
async def task_delay_set(t, ev):
await asyncio.sleep(t)
print("set event")
ev.set()
async def main():
ev = asyncio.Event()
# Set and clear without anything waiting, and test is_set()
print(ev.is_set())
ev.set()
print(ev.is_set())
ev.clear()
print(ev.is_set())
# Create 2 tasks waiting on the event
print("----")
asyncio.create_task(task(1, ev))
asyncio.create_task(task(2, ev))
print("yield")
await asyncio.sleep(0)
print("set event")
ev.set()
print("yield")
await asyncio.sleep(0)
# Create a task waiting on the already-set event
print("----")
asyncio.create_task(task(3, ev))
print("yield")
await asyncio.sleep(0)
# Clear event, start a task, then set event again
print("----")
print("clear event")
ev.clear()
asyncio.create_task(task(4, ev))
await asyncio.sleep(0)
print("set event")
ev.set()
await asyncio.sleep(0)
# Cancel a task waiting on an event (set event then cancel task)
print("----")
ev = asyncio.Event()
t = asyncio.create_task(task(5, ev))
await asyncio.sleep(0)
ev.set()
t.cancel()
await asyncio.sleep(0.1)
# Cancel a task waiting on an event (cancel task then set event)
print("----")
ev = asyncio.Event()
t = asyncio.create_task(task(6, ev))
await asyncio.sleep(0)
t.cancel()
ev.set()
await asyncio.sleep(0.1)
# Wait for an event that does get set in time
print("----")
ev.clear()
asyncio.create_task(task_delay_set(0.01, ev))
await asyncio.wait_for(ev.wait(), 0.1)
await asyncio.sleep(0)
# Wait for an event that doesn't get set in time
print("----")
ev.clear()
asyncio.create_task(task_delay_set(0.1, ev))
try:
await asyncio.wait_for(ev.wait(), 0.01)
except asyncio.TimeoutError:
print("TimeoutError")
await ev.wait()
asyncio.run(main())
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