<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def addGlobalServices(self):
 """ This is where we put service that we don't want to be duplicated on worker subprocesses """

        if self.options.get('global_cache') and self.options.get('cache'):
            # only add the cache service here if the global_cache and cache
            # options were set to True
            _cache = self.getCacheService()
            _cache.startService()