automake fix

[packages/mysql.git] / mysql-fix-dummy-thread-race-condition.patch

## fix-dummy-thread-race-condition.dpatch by  <mkoegler@auto.tuwien.ac.at>
##
## Avoid dummy thread for pthread_exit workaround

--- mysql-5.0.87/mysys/my_thr_init.c~	2009-10-27 13:28:45.000000000 +0200
+++ mysql-5.0.87/mysys/my_thr_init.c	2009-10-27 13:29:49.502552171 +0200
@@ -47,23 +47,6 @@
 pthread_mutexattr_t my_errorcheck_mutexattr;
 #endif
 
-#ifdef TARGET_OS_LINUX
-
-/*
- Dummy thread spawned in my_thread_global_init() below to avoid
- race conditions in NPTL pthread_exit code.
-*/
-
-static pthread_handler_t
-nptl_pthread_exit_hack_handler(void *arg __attribute__((unused)))
-{
-  /* Do nothing! */
-  pthread_exit(0);
-  return 0;
-}
-
-#endif /* TARGET_OS_LINUX */
-
 static uint get_thread_lib(void);
 
 /*
@@ -71,33 +71,6 @@
     return 1;
   }
 
-#ifdef TARGET_OS_LINUX
-  /*
-    BUG#24507: Race conditions inside current NPTL pthread_exit()
-    implementation.
-
-    To avoid a possible segmentation fault during concurrent
-    executions of pthread_exit(), a dummy thread is spawned which
-    initializes internal variables of pthread lib. See bug description
-    for a full explanation.
-
-    TODO: Remove this code when fixed versions of glibc6 are in common
-    use.
-  */
-  if (thd_lib_detected == THD_LIB_NPTL)
-  {
-    pthread_t       dummy_thread;
-    pthread_attr_t  dummy_thread_attr;
-
-    pthread_attr_init(&dummy_thread_attr);
-    pthread_attr_setdetachstate(&dummy_thread_attr, PTHREAD_CREATE_JOINABLE);
-
-    if (pthread_create(&dummy_thread,&dummy_thread_attr,
-                       nptl_pthread_exit_hack_handler, NULL) == 0)
-      (void)pthread_join(dummy_thread, NULL);
-  }
-#endif /* TARGET_OS_LINUX */
-
 #ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
   /*
     Set mutex type to "fast" a.k.a "adaptive"