hydra-queue-runner: Set a thread title for the builder threads

Dependencies

• [2] NKQOEVVP Get rid of "will retry" messages after "maybe cancelling..."
• [*] MHVIT4JY Split hydra-queue-runner.cc more

Change contents

• edit in src/hydra-queue-runner/builder.cc at line 9
  [4.221]

  [4.221]
  +

  +

  + void setThreadName(const std::string & name)

  + {

  + #ifdef __linux__

  + pthread_setname_np(pthread_self(), std::string(name, 0, 15).c_str());

  + #endif

  + }
• edit in src/hydra-queue-runner/builder.cc at line 21
  [4.327]

  [2.0]
  + setThreadName("bld~" + baseNameOf(reservation->step->drvPath));

  +