tests/python-thread-model.py

   1 # nbdkit
   2 # Copyright (C) 2018-2020 Red Hat Inc.
   3 #
   4 # Redistribution and use in source and binary forms, with or without
   5 # modification, are permitted provided that the following conditions are
   6 # met:
   7 #
   8 # * Redistributions of source code must retain the above copyright
   9 # notice, this list of conditions and the following disclaimer.
  10 #
  11 # * Redistributions in binary form must reproduce the above copyright
  12 # notice, this list of conditions and the following disclaimer in the
  13 # documentation and/or other materials provided with the distribution.
  14 #
  15 # * Neither the name of Red Hat nor the names of its contributors may be
  16 # used to endorse or promote products derived from this software without
  17 # specific prior written permission.
  18 #
  19 # THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  20 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21 # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  22 # PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  23 # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  26 # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27 # ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  29 # OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30 # SUCH DAMAGE.
  31
  32 # Python plugin which uses the parallel thread model.  Note that the
  33 # cpython implementation of time.sleep releases the GIL (see
  34 # Modules/timemodule.c:pysleep)
  35
  36 import nbdkit
  37 import time
  38
  39
  40 def thread_model():
  41     return nbdkit.THREAD_MODEL_PARALLEL
  42
  43
  44 def open(readonly):
  45     return {}
  46
  47
  48 def get_size(h):
  49     return 512
  50
  51
  52 def pread(h, count, offset):
  53     time.sleep(10)
  54     return bytearray(count)