Comments (3)
Minimal reproducible example:
import gc
from usim import Queue, run, Scope
async def fetch(queue):
async for item in queue:
pass
async def foo(queue: Queue):
async with Scope() as scope:
scope.do(fetch(queue), volatile=True)
gc.collect()
run(foo(Queue()))
from usim.
This appears to be related to having an exception handler wrapped around the internal yield
of Queue.__aiter__
.
async def __aiter__(self):
while True:
try:
yield await self # <<< here
except StreamClosed:
break
Moving the yield
outside of the try:
block removes the error:
async def __aiter__(self):
while True:
try:
result = await self
except StreamClosed:
break
else:
yield result
Not sure if that also removes the observed side-effects. MCVE does not replicate them yet.
from usim.
The underlying limitation is apparently removed in PyPy 3.7.
from usim.
Related Issues (20)
- GC of coroutines/events leaks state between loops
- Fix Semmle issues
- Add manual documentation to usim subpages
- Switch to Flit
- Inconsistent postponement on exceptions
- Guaranteed Postponement Context
- Concurrent Exception Cascade is ill-defined
- Unexpected end-of-loop when interval overruns HOT 2
- Simulation finishes early HOT 1
- Properly document ResourceLevels
- Add async utility functions/helpers HOT 2
- Simplify Resource conditions
- Scopes swallow exceptions during shutdown HOT 1
- async Task cancellation HOT 1
- Add zenodo DOI to docs
- Pause/Resume simulation HOT 1
- Fix flake8 failures about pre-existing code.
- Checking for compatibility with SimPy 4 HOT 1
- Thread safety/initialisation of __LOOP_STATE__
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from usim.