remove workaround for Python bug in asyncio process.wait(). Requires Python 3.5. Closes #58

artiq/frontend/artiq_ctlmgr.py

@@ -11,7 +11,7 @@ import socket
 from artiq.protocols.sync_struct import Subscriber
 from artiq.protocols.pc_rpc import AsyncioClient, Server
 from artiq.tools import verbosity_args, init_logger
-from artiq.tools import TaskObject, asyncio_process_wait_timeout, Condition
+from artiq.tools import TaskObject, Condition
 
 
 logger = logging.getLogger(__name__)
@@ -88,7 +88,7 @@ class Controller:
     def _wait_and_ping(self):
         while True:
             try:
-                yield from asyncio_process_wait_timeout(self.process,
+                yield from asyncio.wait_for(self.process.wait(),
                                             self.ping_timer)
             except asyncio.TimeoutError:
                 logger.debug("pinging controller %s", self.name)
@@ -137,7 +137,7 @@ class Controller:
                                "command, killing", self.name)
                 self.process.kill()
             try:
-                yield from asyncio_process_wait_timeout(self.process,
+                yield from asyncio.wait_for(self.process.wait(),
                                             self.term_timeout)
             except:
                 logger.warning("Controller %s failed to exit, killing",

artiq/master/worker.py

@@ -7,8 +7,7 @@ import time
 from functools import partial
 
 from artiq.protocols import pyon
-from artiq.tools import (asyncio_process_wait_timeout, asyncio_process_wait,
+from artiq.tools import asyncio_wait_or_cancel
-                         asyncio_wait_or_cancel)
 
 
 logger = logging.getLogger(__name__)
@@ -97,15 +96,14 @@ class Worker:
                 logger.warning("failed to send terminate command to worker"
                                " (RID %s), killing", self.rid, exc_info=True)
                 self.process.kill()
-                yield from asyncio_process_wait(self.process)
+                yield from self.process.wait()
                 return
             try:
-                yield from asyncio_process_wait_timeout(self.process,
+                yield from asyncio.wait_for(self.process.wait(), term_timeout)
-                                                        term_timeout)
             except asyncio.TimeoutError:
                 logger.warning("worker did not exit (RID %s), killing", self.rid)
                 self.process.kill()
-                yield from asyncio_process_wait(self.process)
+                yield from self.process.wait()
             else:
                 logger.debug("worker exited gracefully (RID %s)", self.rid)
         finally:

artiq/tools.py

@@ -88,29 +88,6 @@ def exc_to_warning(coro):
                        exc_info=True)
 
 
-@asyncio.coroutine
-def asyncio_process_wait_timeout(process, timeout):
-    # In Python < 3.5, asyncio.wait_for(process.wait(), ...
-    # causes a futures.InvalidStateError inside asyncio if and when the
-    # process terminates after the timeout.
-    # Work around this problem.
-    @asyncio.coroutine
-    def process_wait_returncode_timeout():
-        while True:
-            if process.returncode is not None:
-                break
-            yield from asyncio.sleep(0.1)
-    yield from asyncio.wait_for(process_wait_returncode_timeout(),
-                                timeout=timeout)
-
-@asyncio.coroutine
-def asyncio_process_wait(process):
-    r = True
-    while r:
-        f, p = yield from asyncio.wait([process.stdout.read(1024)])
-        r = f.pop().result()
-
-
 @asyncio.coroutine
 def asyncio_wait_or_cancel(fs, **kwargs):
     fs = [asyncio.async(f) for f in fs]

conda/artiq/meta.yaml

@@ -28,14 +28,14 @@ build:
 
 requirements:
     build:
-        - python >=3.4.4
+        - python >=3.5.0
         - setuptools
         - numpy
         - migen
         - pyelftools
         - binutils-or1k-linux
     run:
-        - python >=3.4.4
+        - python >=3.5.0
         - llvmlite-artiq
         - scipy
         - numpy

doc/manual/installing.rst

@@ -13,9 +13,9 @@ Installing using conda
 Installing Anaconda or Miniconda
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-* You can either install Anaconda (chose Python 3.4) from https://store.continuum.io/cshop/anaconda/
+* You can either install Anaconda (chose Python 3.5) from https://store.continuum.io/cshop/anaconda/
 
-* Or install the more minimalistic Miniconda (chose Python 3.4) from http://conda.pydata.org/miniconda.html
+* Or install the more minimalistic Miniconda (chose Python 3.5) from http://conda.pydata.org/miniconda.html
 
 .. warning::
     If you are installing on Windows, chose the Windows 32-bit version regardless of whether you have
@@ -148,7 +148,7 @@ These steps are required to generate bitstream (``.bit``) files, build the MiSoC
         $ python3 setup.py develop --user
 
 .. note::
-    The options ``develop`` and ``--user`` are for setup.py to install Migen in ``~/.local/lib/python3.4``.
+    The options ``develop`` and ``--user`` are for setup.py to install Migen in ``~/.local/lib/python3.5``.
 
 .. _install-xc3sprog:
 
@@ -369,7 +369,7 @@ This command installs all the required packages: ::
 
     $ sudo apt-get install build-essential autotools-dev file git patch perl xutils-dev python3-pip texinfo flex bison libmpc-dev python3-serial python3-dateutil python3-prettytable python3-setuptools python3-numpy python3-scipy python3-sphinx python3-h5py python3-dev python-dev subversion cmake libusb-dev libftdi-dev pkg-config libffi-dev libgit2-dev
 
-Note that ARTIQ requires Python 3.4.4 or above.
+Note that ARTIQ requires Python 3.5.0 or above.
 
 To set user permissions on the JTAG and serial ports of the Pipistrello, create a ``/etc/udev/rules.d/30-usb-papilio.rules`` file containing the following: ::
 

setup.py

@@ -5,8 +5,8 @@ import sys
 import os
 
 
-if sys.version_info[:3] < (3, 4, 4):
+if sys.version_info[:3] < (3, 5, 0):
-    raise Exception("You need Python 3.4.4+")
+    raise Exception("You need Python 3.5.0+")
 
 
 class PushDocCommand(Command):