AsynchronousTask: add _async_wait method

For cases where _start returns synchronously, this method is a
convenient way to trigger an asynchronous call to self.wait()
(in order to notify exit listeners), avoiding excessive event
loop recursion (or stack overflow) that synchronous calling of
exit listeners can cause.

1 files changed, 14 insertions, 0 deletions

diff --git a/pym/_emerge/AsynchronousTask.py b/pym/_emerge/AsynchronousTask.py
index 7a193ce7d..b540575d8 100644
--- a/pym/_emerge/AsynchronousTask.py
+++ b/pym/_emerge/AsynchronousTask.py
@@ -60,6 +60,20 @@ class AsynchronousTask(SlotObject):
 	def _wait(self):
 		return self.returncode
 
+	def _async_wait(self):
+		"""
+		For cases where _start exits synchronously, this method is a
+		convenient way to trigger an asynchronous call to self.wait()
+		(in order to notify exit listeners), avoiding excessive event
+		loop recursion (or stack overflow) that synchronous calling of
+		exit listeners can cause.
+		"""
+		self.scheduler.idle_add(self._async_wait_cb)
+
+	def _async_wait_cb(self):
+		self.wait()
+		return False
+
 	def cancel(self):
 		"""
 		Cancel the task, but do not wait for exit status. If asynchronous exit