compiler-rt/test/tsan/deflake.bash

   1 #!/usr/bin/env bash
   2 # This script is used to deflake inherently flaky tsan tests.
   3 # It is invoked from lit tests as:
   4 # %deflake $THRESHOLD  mybinary
   5 # which is then substituted by lit to:
   6 # $(dirname %s)/deflake.bash $THRESHOLD mybinary
   7 # - When TSAN_TEST_DEFLAKE_THRESHOLD is defined to a positive integer value,
   8 #   THRESHOLD will be the defined value.
   9 # - When TSAN_TEST_DEFLAKE_THRESHOLD is not defined, THRESHOLD will be 10.
  10 # The script runs the target program up to $THRESHOLD times,
  11 # until it fails (i.e. produces a race report).
  12
  13 THRESHOLD="${1}"
  14 shift
  15
  16 # Early exit if $THRESHOLD is not a non-negative integer
  17 [[  "${THRESHOLD}" =~ ^[0-9]+$ ]] || exit 1
  18
  19 while (( THRESHOLD-- )); do
  20         OUT=`$@ 2>&1`
  21         if [[ $? != 0 ]]; then
  22                 echo "$OUT"
  23                 exit 0
  24         fi
  25 done
  26 exit 1