Created
December 24, 2009 05:25
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#!/usr/bin/env ruby -wKU | |
require "rubygems" | |
require "ffi" | |
# map the C interface | |
module Lib | |
extend FFI::Library | |
ffi_lib( | |
*Array( | |
ENV.fetch( | |
"TOKYO_CABINET_LIB", | |
Dir["/{opt,usr}/{,local/}lib{,64}/libtokyocabinet.{dylib,so*}"] | |
) | |
) | |
) | |
attach_function :tcfree, [ :pointer ], :void | |
attach_function :tchdbnew, [ ], :pointer | |
attach_function :tchdbopen, [:pointer, :string, :int], :bool | |
attach_function :tchdbput, [:pointer, :pointer, :int, :pointer, | |
:int], :bool | |
attach_function :tchdbget, [:pointer, :pointer, :int, :pointer], :pointer | |
attach_function :tchdbclose, [:pointer], :bool | |
end | |
# translate the interface to Ruby | |
class TokyoCabinet | |
def self.open(*args) | |
db = new(*args) | |
yield db | |
ensure | |
db.close if db | |
end | |
def initialize(path) | |
@db = Lib.tchdbnew | |
Lib.tchdbopen(@db, path, (1 << 1) | (1 << 2)) # write create mode | |
end | |
def []=(key, value) | |
k, v = key.to_s, value.to_s | |
Lib.tchdbput(@db, k, k.size, v, v.size) | |
end | |
def [](key) | |
k = key.to_s | |
size = FFI::MemoryPointer.new(:int) | |
value = Lib.tchdbget(@db, k, k.size, size) | |
value.address.zero? ? nil : value.get_bytes(0, size.get_int(0)) | |
ensure | |
size.free if size | |
# FIXME: How do I free value here? | |
Lib.tcfree(value) | |
end | |
def close | |
Lib.tchdbclose(@db) | |
end | |
end | |
# show the problem | |
def show_memory | |
3.times { GC.start } # try to clean up | |
mem = `ps -o rss -p #{Process.pid}`[/\d+/] | |
puts "Current memory: #{mem}" | |
end | |
TokyoCabinet.open("leak.tch") do |db| | |
db[:some_key] = "X" * 1024 | |
10.times do | |
5000.times do | |
db[:some_key] # reading causes the memory leak | |
end | |
show_memory | |
end | |
end |
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