mysql-fix-dummy-thread-race-condition.patch

   1 ## fix-dummy-thread-race-condition.dpatch by  <mkoegler@auto.tuwien.ac.at>
   2 ##
   3 ## Avoid dummy thread for pthread_exit workaround
   4
   5 --- mysql-5.0.87/mysys/my_thr_init.c~   2009-10-27 13:28:45.000000000 +0200
   6 +++ mysql-5.0.87/mysys/my_thr_init.c    2009-10-27 13:29:49.502552171 +0200
   7 @@ -47,23 +47,6 @@
   8  pthread_mutexattr_t my_errorcheck_mutexattr;
   9  #endif
  10
  11 -#ifdef TARGET_OS_LINUX
  12 -
  13 -/*
  14 - Dummy thread spawned in my_thread_global_init() below to avoid
  15 - race conditions in NPTL pthread_exit code.
  16 -*/
  17 -
  18 -static pthread_handler_t
  19 -nptl_pthread_exit_hack_handler(void *arg __attribute__((unused)))
  20 -{
  21 -  /* Do nothing! */
  22 -  pthread_exit(0);
  23 -  return 0;
  24 -}
  25 -
  26 -#endif /* TARGET_OS_LINUX */
  27 -
  28  static uint get_thread_lib(void);
  29
  30  /*
  31 @@ -71,33 +71,6 @@
  32      return 1;
  33    }
  34
  35 -#ifdef TARGET_OS_LINUX
  36 -  /*
  37 -    BUG#24507: Race conditions inside current NPTL pthread_exit()
  38 -    implementation.
  39 -
  40 -    To avoid a possible segmentation fault during concurrent
  41 -    executions of pthread_exit(), a dummy thread is spawned which
  42 -    initializes internal variables of pthread lib. See bug description
  43 -    for a full explanation.
  44 -
  45 -    TODO: Remove this code when fixed versions of glibc6 are in common
  46 -    use.
  47 -  */
  48 -  if (thd_lib_detected == THD_LIB_NPTL)
  49 -  {
  50 -    pthread_t       dummy_thread;
  51 -    pthread_attr_t  dummy_thread_attr;
  52 -
  53 -    pthread_attr_init(&dummy_thread_attr);
  54 -    pthread_attr_setdetachstate(&dummy_thread_attr, PTHREAD_CREATE_JOINABLE);
  55 -
  56 -    if (pthread_create(&dummy_thread,&dummy_thread_attr,
  57 -                       nptl_pthread_exit_hack_handler, NULL) == 0)
  58 -      (void)pthread_join(dummy_thread, NULL);
  59 -  }
  60 -#endif /* TARGET_OS_LINUX */
  61 -
  62  #ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
  63    /*
  64      Set mutex type to "fast" a.k.a "adaptive"