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test_hwinject.sh: kill lalpulsar_hwinject on walltime instead of CPU time

Karl Wette requested to merge ANU-CGA/lalsuite:kill-hanging-test-hwinject-walltime into master

Description

Unfortunately !1934 (merged) didn't quite solve the issue of hanging jobs (#575 (closed)), so here's another go:

  • ulimit -t measures CPU time, no effect if process isn't consuming CPU cycles
  • Simplest/most portable way to get a walltime timeout is to use alarm()
  • Use perl to set a 60-second alarm() then execs lalpulsar_hwinject; alarm() will raise SIGALRM which (uncaught) will kill lalpulsar_hwinject

API Changes and Justification

Backwards Compatible Changes

  • This change does not modify any class/function/struct/type definitions in a public C header file or any Python class/function definitions
  • This change adds new classes/functions/structs/types to a public C header file or Python module

Backwards Incompatible Changes

  • This change modifies an existing class/function/struct/type definition in a public C header file or Python module
  • This change removes an existing class/function/struct/type from a public C header file or Python module

Review Status

cc @david-keitel

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