Remove uneccesary _platform.multiprocessingaevri/nomp

It turns out we don't need to use multiprocessing.Manager() queues when
using the 'spawn' method - the regular multiprocessing queues are also
picklable, if passed as parameters to the new process.

Thanks to @BenjaminSchubert for pointing this out.

1 files changed, 0 insertions, 8 deletions

diff --git a/src/buildstream/_platform/platform.py b/src/buildstream/_platform/platform.py
index faf3d3c52..11c9217be 100644
--- a/src/buildstream/_platform/platform.py
+++ b/src/buildstream/_platform/platform.py
@@ -28,8 +28,6 @@ import psutil
 from .._exceptions import PlatformError, ImplError, SandboxError
 from .. import utils
 
-from .multiprocessing import QueueManager, PicklableQueueManager
-
 
 class Platform():
     # Platform()
@@ -175,12 +173,6 @@ class Platform():
         uname_machine = platform.uname().machine
         return Platform.canonicalize_arch(uname_machine)
 
-    def make_queue_manager(self):
-        if self.does_multiprocessing_start_require_pickling():
-            return PicklableQueueManager()
-        else:
-            return QueueManager()
-
     # does_multiprocessing_start_require_pickling():
     #
     # Returns True if the multiprocessing start method will pickle arguments