VictorZhang2014

import threading

# A thread-safe implementation of Singleton pattern
# To be used as mixin or base class
class Singleton(object):
    
    # use special name mangling for private class-level lock
    # we don't want a global lock for all the classes that use Singleton
    # each class should have its own lock to reduce locking contention
    __lock = threading.Lock()

VictorZhang2014

$wget https://github.com/google/protobuf/releases/download/v2.5.0/protobuf-2.5.0.tar.bz2
$tar xvf protobuf-2.5.0.tar.bz2
$cd protobuf-2.5.0
$./configure CC=clang CXX=clang++ CXXFLAGS='-std=c++11 -stdlib=libc++ -O3 -g' LDFLAGS='-stdlib=libc++' LIBS="-lc++ -lc++abi"
$make -j 4 
$sudo make install
$protoc --version

VictorZhang2014

// this is the background code...

// listen for our browerAction to be clicked
chrome.browserAction.onClicked.addListener(function (tab) {
	// for the current tab, inject the "inject.js" file & execute it
	chrome.tabs.executeScript(tab.ib, {
		file: 'inject.js'
	});
});