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# frozen_string_literal: false
# Multi-Processing-safe monkey patch for Logger
#
# This monkey patch fixes the case where "preload_app true" is used and
# the application spawns a background thread upon being loaded.
#
# This removes all lock from the Logger code and solely relies on the
# underlying filesystem to handle write(2) system calls atomically when
# O_APPEND is used. This is safe in the presence of both multiple
# threads (native or green) and multiple processes when writing to
# a filesystem with POSIX O_APPEND semantics.
#
# It should be noted that the original locking on Logger could _never_ be
# considered reliable on non-POSIX filesystems with multiple processes,
# either, so nothing is lost in that case.
require 'logger'
class Logger::LogDevice
def write(message)
@dev.syswrite(message)
end
def close
@dev.close
end
end
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