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authorPaul Vinciguerra <pvinci@vinciconsulting.com>2019-06-06 07:06:09 -0400
committerOle Trøan <otroan@employees.org>2019-06-07 09:46:37 +0000
commit2af6e92b78944879fbb41fd4538be15b97402f88 (patch)
treeba5612659031af075a64b74a64ab32cb9d3343fb /src/vpp-api/python
parent2d7b090fe220d182dc43cccb32b71ca1b55ec9d8 (diff)
vpp_papi: Context_id allocator for running forked.
When running forked, distinct copies of the 'get_context' singleton are created for each process. To run under forked processes, (as with make test TEST_JOBS=10), we need to use a shared memory value across the processes. Type: fix Change-Id: I9eab8ce46ec23584e5bd651735ad75fd3f018e1a Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>
Diffstat (limited to 'src/vpp-api/python')
-rw-r--r--src/vpp-api/python/vpp_papi/tests/test_vpp_papi.py53
-rw-r--r--src/vpp-api/python/vpp_papi/vpp_papi.py12
2 files changed, 60 insertions, 5 deletions
diff --git a/src/vpp-api/python/vpp_papi/tests/test_vpp_papi.py b/src/vpp-api/python/vpp_papi/tests/test_vpp_papi.py
new file mode 100644
index 00000000000..774b4e1092c
--- /dev/null
+++ b/src/vpp-api/python/vpp_papi/tests/test_vpp_papi.py
@@ -0,0 +1,53 @@
+# Copyright (c) 2019. Vinci Consulting Corp. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import ctypes
+import multiprocessing as mp
+import unittest
+from vpp_papi import vpp_papi
+
+
+class TestVppPapiVPPApiClient(unittest.TestCase):
+
+ def test_getcontext(self):
+ vpp_papi.VPPApiClient.apidir = '.'
+ c = vpp_papi.VPPApiClient(testmode=True, use_socket=True)
+
+ # reset initialization at module load time.
+ c.get_context.context = mp.Value(ctypes.c_uint, 0)
+ for _ in range(10):
+ c.get_context()
+ self.assertEqual(11, c.get_context())
+
+
+class TestVppPapiVPPApiClientMp(unittest.TestCase):
+ # Test under multiple processes to simulate running forked under
+ # run_tests.py (eg. make test TEST_JOBS=10)
+
+ def test_get_context_mp(self):
+ vpp_papi.VPPApiClient.apidir = '.'
+ c = vpp_papi.VPPApiClient(testmode=True, use_socket=True)
+
+ # reset initialization at module load time.
+ c.get_context.context = mp.Value(ctypes.c_uint, 0)
+ procs = [mp.Process(target=c.get_context, args=()) for i in range(10)]
+
+ for p in procs:
+ p.start()
+ for p in procs:
+ p.join()
+
+ # AssertionError: 11 != 1
+ self.assertEqual(11, c.get_context())
+
diff --git a/src/vpp-api/python/vpp_papi/vpp_papi.py b/src/vpp-api/python/vpp_papi/vpp_papi.py
index 8f179a21a9d..1f5cce23a79 100644
--- a/src/vpp-api/python/vpp_papi/vpp_papi.py
+++ b/src/vpp-api/python/vpp_papi/vpp_papi.py
@@ -16,7 +16,9 @@
from __future__ import print_function
from __future__ import absolute_import
+import ctypes
import sys
+import multiprocessing as mp
import os
import logging
import collections
@@ -263,16 +265,16 @@ class VPPApiClient(object):
atexit.register(vpp_atexit, weakref.ref(self))
class ContextId(object):
- """Thread-safe provider of unique context IDs."""
+ """Multiprocessing-safe provider of unique context IDs."""
def __init__(self):
- self.context = 0
- self.lock = threading.Lock()
+ self.context = mp.Value(ctypes.c_uint, 0)
+ self.lock = mp.Lock()
def __call__(self):
"""Get a new unique (or, at least, not recently used) context."""
with self.lock:
- self.context += 1
- return self.context
+ self.context.value += 1
+ return self.context.value
get_context = ContextId()
def get_type(self, name):