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parallel.py: ensure valid asyncio event loop #139

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parallel.py: ensure valid asyncio event loop #139

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13 changes: 10 additions & 3 deletions brotab/parallel.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,5 @@
from concurrent.futures import ThreadPoolExecutor
from asyncio import get_event_loop, gather

from asyncio import get_event_loop, gather, new_event_loop, set_event_loop

def call_parallel(functions):
"""
Expand All @@ -9,7 +8,15 @@ def call_parallel(functions):
Create a pool of thread as large as the number of functions.
Functions should accept no parameters (wrap then with partial or lambda).
"""
loop = get_event_loop()

try:
loop = get_event_loop()
if loop.is_closed():
raise RuntimeError("Event loop is closed.")
except RuntimeError:
loop = new_event_loop()
set_event_loop(loop)

executor = ThreadPoolExecutor(max_workers=len(functions))

try:
Expand Down