/usr/lib/ruby/vendor_ruby/thread_safe/synchronized_cache_backend.rb is in ruby-thread-safe 0.3.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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class SynchronizedCacheBackend < NonConcurrentCacheBackend
require 'mutex_m'
include Mutex_m
# WARNING: Mutex_m is a non-reentrant lock, so the synchronized methods are
# not allowed to call each other.
def [](key)
synchronize { super }
end
def []=(key, value)
synchronize { super }
end
def compute_if_absent(key)
synchronize { super }
end
def compute_if_present(key)
synchronize { super }
end
def compute(key)
synchronize { super }
end
def merge_pair(key, value)
synchronize { super }
end
def replace_pair(key, old_value, new_value)
synchronize { super }
end
def replace_if_exists(key, new_value)
synchronize { super }
end
def get_and_set(key, value)
synchronize { super }
end
def key?(key)
synchronize { super }
end
def value?(value)
synchronize { super }
end
def delete(key)
synchronize { super }
end
def delete_pair(key, value)
synchronize { super }
end
def clear
synchronize { super }
end
def size
synchronize { super }
end
def get_or_default(key, default_value)
synchronize { super }
end
private
def dupped_backend
synchronize { super }
end
end
end
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