When implementing communication between multiple threads, ensure that messages are correctly routed to their intended recipients. Avoid designs where all worker threads consume from a single shared queue when messages are intended for specific threads, as this creates race conditions where messages can be processed by the wrong thread.
When implementing communication between multiple threads, ensure that messages are correctly routed to their intended recipients. Avoid designs where all worker threads consume from a single shared queue when messages are intended for specific threads, as this creates race conditions where messages can be processed by the wrong thread.
Instead, consider one of these approaches:
Example of problematic code:
def _server_loop(self, server: McpServer, loop: asyncio.AbstractEventLoop) -> None:
while True:
# All threads compete for the same messages
msg: CallArguments = self.message_queue.get()
# If message not for this server, discard it
if msg.server_name != server.name:
self.message_queue.task_done()
continue
# Process the message...
Better implementation:
class McpManager:
def __init__(self):
# One queue per server for proper message routing
self.server_queues = {} # server_name -> queue
self.result_queue = queue.Queue()
def add_server(self, server_name):
self.server_queues[server_name] = queue.Queue()
def _call(self, io, server_name, function, args={}):
# Route message to specific server queue
if server_name in self.server_queues:
self.server_queues[server_name].put(CallArguments(server_name, function, args))
result = self.result_queue.get()
return result.response
return None
def _server_loop(self, server: McpServer, loop: asyncio.AbstractEventLoop) -> None:
# Each server only processes its own messages
server_queue = self.server_queues[server.name]
while True:
msg = server_queue.get()
# Process message...
This pattern prevents race conditions and ensures messages are always processed by their intended recipients.
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