import sys
from multiprocessing import Pool, Lock

class ParentApp():
    mutex=Lock()
    def report(self,msg):
        with ParentApp.mutex:
            sys.stdout.write(msg)

class ChildApp1(ParentApp):
    def print_report(self):
        for i in xrange(100):
            ParentApp.report(self, 'BLABLA')


class ChildApp2(ParentApp):
    def print_report(self):
        for i in xrange(100):
            ParentApp.report(self, 'TESTTEST')

def runnable(app):
    app.print_report()

def main():
    app=[]
    app.append(ChildApp1())
    app.append(ChildApp2())

    pool = Pool(len(apps))
    pool.map(runnable, apps)

    exit(0)

if __name__ == '__main__':
    sys.exit(main())