[V1][Core] Remove should_shutdown to simplify core process termination #11113
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This PR removes the
should_shutdown
multiprocessing.Value
in favor of having one single process termination mechanism, which is an exception that handles both SIGINT and SIGTERM, and we need to handle SIGINT anyway.Tested manually that this shuts down correctly when setting
VLLM_ENABLE_V1_MULTIPROCESSING=1 VLLM_USE_V1=1
using both a simple script (uses atexit -> shutdown() codepath) and usingvllm serve
(sending both a SIGINT and SIGTERM)