Disable pysawsim.manager.subproc is multiprocessing is missing.

diff --git a/pysawsim/manager/subproc.py b/pysawsim/manager/subproc.py
index d0bb007fbfd14cd1efe7d3b1aae68546a5d55e93..ad0d64bc693595754e2313555ec7078615a06b1c 100644 (file)
--- a/pysawsim/manager/subproc.py
+++ b/pysawsim/manager/subproc.py
@@ -20,15 +20,21 @@
 """Functions for running external commands on other hosts.
 """
 
-from multiprocessing import Manager, Process, Queue, cpu_count
+try:
+    from multiprocessing import Manager, Process, Queue, cpu_count
+    _SKIP = ''
+except ImportError, multiprocessing_error:
+    Process = object
+    _SKIP = '  # doctest: +SKIP'
 
 from .. import log
 from . import Job
 from .thread import ThreadManager, CLOSE_MESSAGE
 
-
 class WorkerProcess (Process):
     def __init__(self, spawn_queue, receive_queue, *args, **kwargs):
+        if Process == object:
+            raise multiprocessing_error
         super(WorkerProcess, self).__init__(*args, **kwargs)
         self.spawn_queue = spawn_queue
         self.receive_queue = receive_queue
@@ -50,27 +56,29 @@ class SubprocessManager (ThreadManager):
 
     >>> from time import sleep
     >>> from math import sqrt
-    >>> m = SubprocessManager()
+    >>> m = SubprocessManager()%(skip)s
     >>> group_A = []
-    >>> for i in range(10):
+    >>> for i in range(10):%(skip)s
     ...     t = max(0, 5-i)
     ...     group_A.append(m.async_invoke(Job(target=sleep, args=[t])))
     >>> group_B = []
-    >>> for i in range(10):
+    >>> for i in range(10):%(skip)s
     ...     group_B.append(m.async_invoke(Job(target=sqrt, args=[i],
     ...                 blocks_on=[j.id for j in group_A])))
-    >>> jobs = m.wait(ids=[j.id for j in group_A[5:8]])
-    >>> print sorted(jobs.values(), key=lambda j: j.id)
+    >>> jobs = m.wait(ids=[j.id for j in group_A[5:8]])%(skip)s
+    >>> print sorted(jobs.values(), key=lambda j: j.id)%(skip)s
     [<Job 5>, <Job 6>, <Job 7>]
-    >>> jobs = m.wait()
-    >>> print sorted(jobs.values(), key=lambda j: j.id)
+    >>> jobs = m.wait()%(skip)s
+    >>> print sorted(jobs.values(), key=lambda j: j.id)%(skip)s
     ... # doctest: +NORMALIZE_WHITESPACE
     [<Job 0>, <Job 1>, <Job 2>, <Job 3>, <Job 4>, <Job 8>, <Job 9>, <Job 10>,
      <Job 11>, <Job 12>, <Job 13>, <Job 14>, <Job 15>, <Job 16>, <Job 17>,
      <Job 18>, <Job 19>]
-    >>> m.teardown()
-    """
+    >>> m.teardown()%(skip)s
+    """ % {'skip': _SKIP}
     def __init__(self, worker_pool=None):
+        if Process == object:
+            raise multiprocessing_error
         super(SubprocessManager, self).__init__(worker_pool=worker_pool)
 
     def _setup_queues(self):