# Test zsh/system module

%prep

  if zmodload -s zsh/system && zmodload -s zsh/zselect; then
    tst_dir=V14.tmp
    mkdir -p -- $tst_dir
  else
    ZTST_unimplemented='the zsh/system and zsh/zselect modules are not available'
  fi
  : > $tst_dir/file # File on which to acquire flock.

%test

  (
    zsystem flock -t 0 -i 0.000001 $tst_dir/file    &&
    zsystem flock -t 0.1 -i 0.000001 $tst_dir/file  &&
    zsystem flock -t 0.1 -i 0.0000001 $tst_dir/file &&
    zsystem flock -t 1 -i 0.000001 $tst_dir/file
  )
0:zsystem flock valid time arguments

  (
    zsystem flock -t 1073741824 $tst_dir/file ||
    zsystem flock -t 1e100      $tst_dir/file ||
    zsystem flock -i -1         $tst_dir/file ||
    zsystem flock -i 0          $tst_dir/file ||
    zsystem flock -i 1e100      $tst_dir/file
  )
1:zsystem flock invalid time arguments
?(eval):zsystem:2: flock: invalid timeout value: '1073741824'
?(eval):zsystem:3: flock: invalid timeout value: '1e100'
?(eval):zsystem:4: flock: invalid interval value: '-1'
?(eval):zsystem:5: flock: invalid interval value: '0'
?(eval):zsystem:6: flock: invalid interval value: '1e100'

  (
    # Lock file for 1 second in the background.
    lock_flag=$tst_dir/locked1
    (zsystem flock $tst_dir/file \
     && touch $lock_flag \
     && zselect -t 100
     mv $lock_flag $lock_flag.done) &
    # Wait until sub-shell above has started.
    while ! [[ -f $lock_flag || -f $lock_flag.done ]]; do
      zselect -t 1
    done
    if [[ -f $lock_flag.done ]]; then
      echo "Background shell should not have completed already." 1>&2
    else
      # Attempt to lock file with 0.5 second timeout: must fail.
      zsystem flock -t 0.5 $tst_dir/file
    fi
  )
2:zsystem flock unsuccessful wait test
F:This timing test might fail due to process scheduling issues unrelated to zsh.

  (
    # Lock file for 0.5 second in the background.
    lock_flag=$tst_dir/locked2
    (zsystem flock $tst_dir/file \
      && touch $lock_flag \
      && zselect -t 50
      mv $lock_flag $lock_flag.done) &
    # Wait until sub-shell above has started.
    while ! [[ -f $lock_flag || -f $lock_flag.done ]]; do
      zselect -t 1
    done
    if [[ -f $lock_flag.done ]]; then
      echo "Background shell should not have completed already." 1>&2
    fi
    typeset -F SECONDS
    start=$SECONDS
    # Attempt to lock file without a timeout:
    # must succeed after sub-shell above releases it (0.5 second).
    if zsystem flock $tst_dir/file; then
      elapsed=$[ $SECONDS - $start ]
      if [[ $elapsed -ge 0.3 && $elapsed -le 0.7 ]]; then
        echo "elapsed time seems OK" 1>&2
      else
        echo "elapsed time $elapsed should be ~ 0.5 second" 1>&2
      fi
    fi
  )
0:zsystem flock successful wait test, no timeout
?elapsed time seems OK
F:This timing test might fail due to process scheduling issues unrelated to zsh.

  (
    # Lock file for 0.5 second in the background.
    lock_flag=$tst_dir/locked3
    (zsystem flock $tst_dir/file \
      && touch $lock_flag \
      && zselect -t 50
      mv $lock_flag $lock_flag.done) &
    # Wait until sub-shell above has started.
    while ! [[ -f $lock_flag || -f $lock_flag.done ]]; do
      zselect -t 1
    done
    if [[ -f $lock_flag.done ]]; then
      echo "Background shell should not have completed already." 1>&2
    fi
    typeset -F SECONDS
    start=$SECONDS
    # Attempt to lock file with 1-second timeout:
    # must succeed 1 second after start because we retry every 1 second.
    if zsystem flock -t 1 $tst_dir/file; then
      elapsed=$[ $SECONDS - $start ]
      if [[ $elapsed -ge 0.8 && $elapsed -le 1.2 ]]; then
        echo "elapsed time seems OK" 1>&2
      else
        echo "elapsed time $elapsed should be ~ 1 second" 1>&2
      fi
    fi
  )
0:zsystem flock successful wait test, integral seconds
?elapsed time seems OK
F:This timing test might fail due to process scheduling issues unrelated to zsh.

  (
    # Lock file for 0.25 second in the background.
    lock_flag=$tst_dir/locked4
    (zsystem flock $tst_dir/file \
      && touch $lock_flag \
      && zselect -t 25
      mv $lock_flag $lock_flag.done) &
    # Wait until sub-shell above has started.
    while ! [[ -f $lock_flag || -f $lock_flag.done ]]; do
      zselect -t 1
    done
    if [[ -f $lock_flag.done ]]; then
      echo "Background shell should not have completed already." 1>&2
    fi
    typeset -F SECONDS
    start=$SECONDS
    # Attempt to lock file with 0.4-second timeout, retrying every 0.1 second:
    # must succeed 0.3 second after start.
    if zsystem flock -t 0.4 -i 0.1 $tst_dir/file; then
      elapsed=$[ $SECONDS - $start ]
      if [[ $elapsed -ge 0.2 && $elapsed -le 0.5 ]]; then
        echo "elapsed time seems OK" 1>&2
      else
        echo "elapsed time $elapsed should be ~ 0.3 second" 1>&2
      fi
    fi
  )
0:zsystem flock successful wait test, fractional seconds
?elapsed time seems OK
F:This timing test might fail due to process scheduling issues unrelated to zsh.