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require 'concurrent/errors'
module Concurrent
# Define update methods that use direct paths
#
# @!visibility private
# @!macro internal_implementation_note
module AtomicDirectUpdate
def update
true until compare_and_set(old_value = get, new_value = yield(old_value))
new_value
end
def try_update
old_value = get
new_value = yield old_value
return unless compare_and_set old_value, new_value
new_value
end
def try_update!
old_value = get
new_value = yield old_value
unless compare_and_set(old_value, new_value)
if $VERBOSE
raise ConcurrentUpdateError, "Update failed"
else
raise ConcurrentUpdateError, "Update failed", ConcurrentUpdateError::CONC_UP_ERR_BACKTRACE
end
end
new_value
end
end
end
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