From 092803df76a6112279b06f05f75a95b3285a97ea Mon Sep 17 00:00:00 2001
From: Zac Medico <zmedico@gentoo.org>
Date: Mon, 18 Jul 2011 01:21:39 -0700
Subject: [PATCH] Scheduler: simplify _terminate_tasks

This should also fix bugs related to CompositeTask instances waiting
for queued tasks to start and not being properly terminated in this
case.
---
 pym/_emerge/Scheduler.py | 27 ++++++++-------------------
 1 file changed, 8 insertions(+), 19 deletions(-)

diff --git a/pym/_emerge/Scheduler.py b/pym/_emerge/Scheduler.py
index 2574d3de4..1b3a03421 100644
--- a/pym/_emerge/Scheduler.py
+++ b/pym/_emerge/Scheduler.py
@@ -229,7 +229,7 @@ class Scheduler(PollScheduler):
 
 		self._prefetchers = weakref.WeakValueDictionary()
 		self._pkg_queue = []
-		self._running_tasks = set()
+		self._running_tasks = {}
 		self._completed_tasks = set()
 
 		self._failed_pkgs = []
@@ -291,20 +291,9 @@ class Scheduler(PollScheduler):
 
 	def _terminate_tasks(self):
 		self._status_display.quiet = True
-		# Remove running_tasks that have been added to queues but
-		# haven't been started yet, since we're going to discard
-		# them and their start/exit handlers won't be called.
-		for build in self._task_queues.jobs._task_queue:
-			self._running_tasks.remove(build.pkg)
-		if self._merge_wait_queue:
-			for merge in self._merge_wait_queue:
-				self._running_tasks.remove(merge.merge.pkg)
-			self._merge_wait_queue.clear()
-		for merge in self._task_queues.merge._task_queue:
-			# Setup phases may be scheduled in this queue, but
-			# we're only interested in the PackageMerge instances.
-			if isinstance(merge, PackageMerge):
-				self._running_tasks.remove(merge.merge.pkg)
+		while self._running_tasks:
+			task_id, task = self._running_tasks.popitem()
+			task.cancel()
 		for q in self._task_queues.values():
 			q.clear()
 
@@ -1311,6 +1300,7 @@ class Scheduler(PollScheduler):
 		self._merge_exit(task)
 
 	def _merge_exit(self, merge):
+		self._running_tasks.pop(id(merge), None)
 		self._do_merge_exit(merge)
 		self._deallocate_config(merge.merge.settings)
 		if merge.returncode == os.EX_OK and \
@@ -1321,7 +1311,6 @@ class Scheduler(PollScheduler):
 
 	def _do_merge_exit(self, merge):
 		pkg = merge.merge.pkg
-		self._running_tasks.remove(pkg)
 		if merge.returncode != os.EX_OK:
 			settings = merge.merge.settings
 			build_dir = settings.get("PORTAGE_BUILDDIR")
@@ -1366,15 +1355,16 @@ class Scheduler(PollScheduler):
 		mtimedb.commit()
 
 	def _build_exit(self, build):
+		self._running_tasks.pop(id(build), None)
 		if build.returncode == os.EX_OK and self._terminated_tasks:
 			# We've been interrupted, so we won't
 			# add this to the merge queue.
 			self.curval += 1
-			self._running_tasks.remove(build.pkg)
 			self._deallocate_config(build.settings)
 		elif build.returncode == os.EX_OK:
 			self.curval += 1
 			merge = PackageMerge(merge=build)
+			self._running_tasks[id(merge)] = merge
 			if not build.build_opts.buildpkgonly and \
 				build.pkg in self._deep_system_deps:
 				# Since dependencies on system packages are frequently
@@ -1386,7 +1376,6 @@ class Scheduler(PollScheduler):
 				self._task_queues.merge.add(merge)
 				self._status_display.merges = len(self._task_queues.merge)
 		else:
-			self._running_tasks.remove(build.pkg)
 			settings = build.settings
 			build_dir = settings.get("PORTAGE_BUILDDIR")
 			build_log = settings.get("PORTAGE_LOG_FILE")
@@ -1672,7 +1661,7 @@ class Scheduler(PollScheduler):
 				self._pkg_count.curval += 1
 
 			task = self._task(pkg)
-			self._running_tasks.add(pkg)
+			self._running_tasks[id(task)] = task
 
 			if pkg.installed:
 				merge = PackageMerge(merge=task)
-- 
2.26.2