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process library. Use the self-pipe trick to signal a dedicated thread when a SIGCHLD signal is received. The dedicated thread will perform the actual work of extracting the exit code and posting it back to Dart. R=sgjesse@google.com BUG= TEST= Review URL: https://chromiumcodereview.appspot.com//9293030 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@3711 260f80e4-7a28-3924-810f-c04153c831b5