annotate: Multi-threaded Apps

 
 14 Multi-threaded Applications
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 The following annotations report thread related changes of state.
 
 '^Z^Znew-thread'
 
      This annotation is issued once for each thread that is created
      apart from the main thread, which is not reported.
 
 '^Z^Zthread-changed'
 
      The selected thread has changed.  This may occur at the request of
      the user with the 'thread' command, or as a result of execution,
      e.g., another thread hits a breakpoint.