Test UI worker interaction

  $ cat > t.py <<EOF

  > from __future__ import absolute_import, print_function

  > import time

  > from mercurial import (

  >     error,

  >     registrar,

  >     ui as uimod,

  >     worker,

  > )

  > def abort(ui, args):

  >     if args[0] == 0:

  >         # by first worker for test stability

  >         raise error.Abort('known exception')

  >     return runme(ui, [])

  > def exc(ui, args):

  >     if args[0] == 0:

  >         # by first worker for test stability

  >         raise Exception('unknown exception')

  >     return runme(ui, [])

  > def runme(ui, args):

  >     for arg in args:

  >         ui.status('run\n')

  >         yield 1, arg

  >     time.sleep(0.1) # easier to trigger killworkers code path

  > functable = {

  >     'abort': abort,

  >     'exc': exc,

  >     'runme': runme,

  > }

  > cmdtable = {}

  > command = registrar.command(cmdtable)

  > def t(ui, repo, cost=1.0, func='runme'):

  >     cost = float(cost)

  >     func = functable[func]

  >     ui.status('start\n')

  >     runs = worker.worker(ui, cost, func, (ui,), range(8))

  >     for n, i in runs:

  >         pass

  >     ui.status('done\n')

  > EOF

  $ abspath=`pwd`/t.py

  $ hg init

Run tests with worker enable by forcing a heigh cost

  $ hg --config "extensions.t=$abspath" test 100000.0

  start

  run

  run

  run

  run

  run

  run

  run

  run

  done

Run tests without worker by forcing a low cost

  $ hg --config "extensions.t=$abspath" test 0.0000001

  start

  run

  run

  run

  run

  run

  run

  run

  run

  done

#if no-windows

Known exception should be caught, but printed if --traceback is enabled

  $ hg --config "extensions.t=$abspath" --config 'worker.numcpus=8' \

  > test 100000.0 abort 2>&1

  start

  abort: known exception

  [255]

  $ hg --config "extensions.t=$abspath" --config 'worker.numcpus=8' \

  > test 100000.0 abort --traceback 2>&1 | egrep '^(SystemExit|Abort)'

  Abort: known exception

  SystemExit: 255

Traceback must be printed for unknown exceptions

  $ hg --config "extensions.t=$abspath" --config 'worker.numcpus=8' \

  > test 100000.0 exc 2>&1 | grep '^Exception'

  Exception: unknown exception

Workers should not do cleanups in all cases

  $ cat > $TESTTMP/detectcleanup.py <<EOF

  > from __future__ import absolute_import

  > import atexit

  > import os

  > import time

  > oldfork = os.fork

  > count = 0

  > parentpid = os.getpid()

  > def delayedfork():

  >     global count

  >     count += 1

  >     pid = oldfork()

  >     # make it easier to test SIGTERM hitting other workers when they have

  >     # not set up error handling yet.

  >     if count > 1 and pid == 0:

  >         time.sleep(0.1)

  >     return pid

  > os.fork = delayedfork

  > def cleanup():

  >     if os.getpid() != parentpid:

  >         os.write(1, 'should never happen\n')

  > atexit.register(cleanup)

  > EOF

  $ hg --config "extensions.t=$abspath" --config worker.numcpus=8 --config \

  > "extensions.d=$TESTTMP/detectcleanup.py" test 100000 abort

  start

  abort: known exception

  [255]

#endif