tests/test-dump-plugin-thread-model.sh

   1 #!/usr/bin/env bash
   2 # nbdkit
   3 # Copyright (C) 2014-2020 Red Hat Inc.
   4 #
   5 # Redistribution and use in source and binary forms, with or without
   6 # modification, are permitted provided that the following conditions are
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  10 # notice, this list of conditions and the following disclaimer.
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  12 # * Redistributions in binary form must reproduce the above copyright
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  17 # used to endorse or promote products derived from this software without
  18 # specific prior written permission.
  19 #
  20 # THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  21 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22 # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  23 # PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  24 # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  26 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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  29 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  30 # OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31 # SUCH DAMAGE.
  32
  33 # Test that --dump-plugin can be used to introspect a resulting
  34 # dynamic thread model.
  35
  36 source ./functions.sh
  37 set -e
  38 set -x
  39
  40 requires_plugin file
  41 requires_plugin sh
  42 requires_filter noparallel
  43
  44 # First, get a baseline (since a system without atomic CLOEXEC can't
  45 # do parallel). Then test various patterns with the sh plugin.
  46 max=$(nbdkit --dump-plugin file | $SED -n '/^thread_model=/ s///p')
  47
  48 # With no script, thread_model matches the baseline
  49 out=$(nbdkit --dump-plugin sh | grep thread_model)
  50 exp="max_thread_model=parallel
  51 thread_model=$max
  52 has_thread_model=1"
  53 if [ "$out" != "$exp" ]; then
  54     echo "thread_model mismatch"; exit 1
  55 fi
  56
  57 # With a script that does not specify a model, historical back-compat
  58 # forces the model to serialized
  59 out=$(nbdkit --dump-plugin sh - <<\EOF | grep ^thread_model
  60 case $1 in
  61     get_size) echo 1M ;;
  62     *) exit 2 ;;
  63 esac
  64 EOF
  65 )
  66 if [ "$out" != "thread_model=serialize_all_requests" ]; then
  67     echo "thread_model mismatch"; exit 1
  68 fi
  69
  70 # A script can request the maximum, but will only get the baseline
  71 out=$(nbdkit --dump-plugin sh - <<\EOF | grep ^thread_model
  72 case $1 in
  73     thread_model) echo parallel ;;
  74     get_size) echo 1M ;;
  75     *) exit 2 ;;
  76 esac
  77 EOF
  78 )
  79 if [ "$out" != "thread_model=$max" ]; then
  80     echo "thread_model mismatch"; exit 1
  81 fi
  82
  83 # A script can request an even stricter model
  84 out=$(nbdkit --dump-plugin sh - <<\EOF | grep ^thread_model
  85 case $1 in
  86     thread_model) echo serialize_connections ;;
  87     get_size) echo 1M ;;
  88     *) exit 2 ;;
  89 esac
  90 EOF
  91 )
  92 if [ "$out" != "thread_model=serialize_connections" ]; then
  93     echo "thread_model mismatch"; exit 1
  94 fi
  95
  96 # Finally, a filter can restrict things
  97 out=$(nbdkit --dump-plugin --filter=noparallel sh - \
  98              serialize=connections <<\EOF | grep ^thread_model
  99 case $1 in
 100     get_size) echo 1M ;;
 101     *) exit 2 ;;
 102 esac
 103 EOF
 104 )
 105 if [ "$out" != "thread_model=serialize_connections" ]; then
 106     echo "thread_model mismatch"; exit 1
 107 fi