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由 Jason Simmons 提交于
The service protocol holds the lock while waiting for completion of service RPC tasks. These tasks (specifically hot restart/RunInView) may need to modify a handler's description data. Task execution and ServiceProtocol::SetHandlerDescription will obtain a shared lock to make this possible. AddHandler and RemoveHandler will obtain an exclusive lock in order to guard against a handler being deleted while a service task is running.
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