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Add thread-safety to LimitedQueue by implementing a lock for put and get methods

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Sergey Krashevich 2023-07-06 17:09:56 +03:00
parent 2fae9dcb93
commit bf234445af
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1 changed files with 20 additions and 16 deletions
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8
frigate/util.py
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@ -1239,8 +1239,10 @@ class LimitedQueue(FFQueue):
self.size = multiprocessing.RawValue( self.size = multiprocessing.RawValue(
ctypes.c_int, 0 ctypes.c_int, 0
) # Add a counter for the number of items in the queue ) # Add a counter for the number of items in the queue
self.lock = multiprocessing.Lock() # Add a lock for thread-safety
def put(self, x, block=True, timeout=DEFAULT_TIMEOUT): def put(self, x, block=True, timeout=DEFAULT_TIMEOUT):
with self.lock: # Ensure thread-safety
if self.maxsize > 0 and self.size.value >= self.maxsize: if self.maxsize > 0 and self.size.value >= self.maxsize:
if block: if block:
start_time = time.time() start_time = time.time()
@ -1255,13 +1257,15 @@ class LimitedQueue(FFQueue):
return super().put(x, block=block, timeout=timeout) return super().put(x, block=block, timeout=timeout)
def get(self, block=True, timeout=DEFAULT_TIMEOUT): def get(self, block=True, timeout=DEFAULT_TIMEOUT):
item = super().get(block=block, timeout=timeout)
with self.lock: # Ensure thread-safety
if self.size.value <= 0 and not block: if self.size.value <= 0 and not block:
raise Empty raise Empty
self.size.value -= 1 self.size.value -= 1
return super().get(block=block, timeout=timeout) return item
def qsize(self): def qsize(self):
return self.size return self.size.value # Return the value, not the RawValue object
def empty(self): def empty(self):
return self.qsize() == 0 return self.qsize() == 0