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Use event sync for increment task launch

basic_alerts
Tyler Goodlet 2021-01-04 14:44:39 -05:00
parent c7ff0804db
commit 9478adf600
1 changed files with 10 additions and 0 deletions
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10
piker/data/_buffer.py
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@ -27,6 +27,12 @@ from ._sharedmem import ShmArray
_shms: Dict[int, ShmArray] = {} _shms: Dict[int, ShmArray] = {}
_start_increment: Dict[str, trio.Event] = {}
def shm_incrementing(shm_token_name: str) -> trio.Event:
global _start_increment
return _start_increment.setdefault(shm_token_name, trio.Event())
@tractor.msg.pub @tractor.msg.pub
@ -47,6 +53,10 @@ async def increment_ohlc_buffer(
Note that if **no** actor has initiated this task then **none** of Note that if **no** actor has initiated this task then **none** of
the underlying buffers will actually be incremented. the underlying buffers will actually be incremented.
""" """
# wait for brokerd to signal we should start sampling
await shm_incrementing(shm_token['shm_name']).wait()
# TODO: right now we'll spin printing bars if the last time stamp is # TODO: right now we'll spin printing bars if the last time stamp is
# before a large period of no market activity. Likely the best way # before a large period of no market activity. Likely the best way
# to solve this is to make this task aware of the instrument's # to solve this is to make this task aware of the instrument's