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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 async def execution_barrier(self):
 """Wait for executors to finish. At least one must finish after this point to avoid a deadlock. """

        async def _barrier():
            """Enter the sync block and exit the app afterwards."""
            async with self.sync_counter:
                pass
            await consumer.exit_consumer()

        self._ensure_counter()
        await asyncio.wait([
            _barrier(),
            consumer.run_consumer(),
        ])
        self.sync_counter = self._SynchronizationManagerDummy()