Scheduler: tweak _add_prefetchers

Since commit 4620d6aba1c5c10344e311585516ee43819b703c, the first
prefetcher is started as soon as it's added to the task queue.

1 files changed, 6 insertions, 8 deletions

diff --git a/pym/_emerge/Scheduler.py b/pym/_emerge/Scheduler.py
index d3f77611d..6502f71c5 100644
--- a/pym/_emerge/Scheduler.py
+++ b/pym/_emerge/Scheduler.py
@@ -733,15 +733,13 @@ class Scheduler(PollScheduler):
 					continue
 				prefetcher = self._create_prefetcher(pkg)
 				if prefetcher is not None:
-					self._task_queues.fetch.add(prefetcher)
+					# This will start the first prefetcher immediately, so that
+					# self._task() won't discard it. This avoids a case where
+					# the first prefetcher is discarded, causing the second
+					# prefetcher to occupy the fetch queue before the first
+					# fetcher has an opportunity to execute.
 					prefetchers[pkg] = prefetcher
-
-			# Start the first prefetcher immediately so that self._task()
-			# won't discard it. This avoids a case where the first
-			# prefetcher is discarded, causing the second prefetcher to
-			# occupy the fetch queue before the first fetcher has an
-			# opportunity to execute.
-			self._task_queues.fetch.schedule()
+					self._task_queues.fetch.add(prefetcher)
 
 	def _create_prefetcher(self, pkg):
 		"""