Jason Simmons f5496c0977 Guard the service protocol's global handlers list with a reader/writer lock (#6888) (flutter/engine#6895)
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.
2018-11-17 22:04:37 -08:00
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