Merge bk-internal.mysql.com:/home/bk/mysql-5.1-runtime

into  alik.:/mnt/raid/alik/MySQL/devel/5.1-rt-bug17486

mysql-test/t/disabled.def

@@ -14,8 +14,6 @@
 #events                   : BUG#17619 2006-02-21 andrey  Race conditions
 #events_scheduling        : BUG#19170 2006-04-26 andrey  Test case of 19170 fails on some platforms. Has to be checked.
 im_options                : Bug#20294 2006-07-24 stewart   Instance manager test im_options fails randomly
-#im_life_cycle             : Bug#20368 2006-06-10 alik    im_life_cycle test fails
-im_daemon_life_cycle     : BUG#22379 2006-09-15 ingo    im_daemon_life_cycle.test fails on merge of 5.1 -> 5.1-engines
 im_instance_conf         : BUG#20294 2006-09-16 ingo    Instance manager test im_instance_conf fails randomly
 concurrent_innodb        : BUG#21579 2006-08-11 mleich innodb_concurrent random failures with varying differences
 ndb_autodiscover         : BUG#18952 2006-02-16 jmiller Needs to be fixed w.r.t binlog

server-tools/instance-manager/guardian.cc

@@ -74,7 +74,7 @@ Guardian_thread::Guardian_thread(Thread_registry &thread_registry_arg,
                                  uint monitoring_interval_arg) :
   Guardian_thread_args(thread_registry_arg, instance_map_arg,
                        monitoring_interval_arg),
-  thread_info(pthread_self()), guarded_instances(0)
+  thread_info(pthread_self(), TRUE), guarded_instances(0)
 {
   pthread_mutex_init(&LOCK_guardian, 0);
   pthread_cond_init(&COND_guardian, 0);
@@ -250,6 +250,8 @@ void Guardian_thread::run()
   LIST *node;
   struct timespec timeout;
 
+  log_info("Guardian: started.");
+
   thread_registry.register_thread(&thread_info);
 
   my_thread_init();
@@ -277,12 +279,16 @@ void Guardian_thread::run()
                                      &LOCK_guardian, &timeout);
   }
 
+  log_info("Guardian: stopped.");
+
   stopped= TRUE;
   pthread_mutex_unlock(&LOCK_guardian);
   /* now, when the Guardian is stopped we can stop the IM */
   thread_registry.unregister_thread(&thread_info);
   thread_registry.request_shutdown();
   my_thread_end();
+
+  log_info("Guardian: finished.");
 }
 
 

server-tools/instance-manager/instance.cc

@@ -34,6 +34,7 @@
 #include "mysql_manager_error.h"
 #include "portability.h"
 #include "priv.h"
+#include "thread_registry.h"
 
 
 const LEX_STRING
@@ -44,7 +45,8 @@ static const int INSTANCE_NAME_PREFIX_LEN= Instance::DFLT_INSTANCE_NAME.length;
 
 
 static void start_and_monitor_instance(Instance_options *old_instance_options,
-                                       Instance_map *instance_map);
+                                       Instance_map *instance_map,
+                                       Thread_registry *thread_registry);
 
 #ifndef __WIN__
 typedef pid_t My_process_info;
@@ -63,7 +65,8 @@ pthread_handler_t proxy(void *arg)
 {
   Instance *instance= (Instance *) arg;
   start_and_monitor_instance(&instance->options,
-                             instance->get_map());
+                             instance->get_map(),
+                             &instance->thread_registry);
   return 0;
 }
 
@@ -99,6 +102,7 @@ static int wait_process(My_process_info *pi)
     thread, but we don't know this one). Or we could use waitpid(), but
     couldn't use wait(), because it could return in any wait() in the program.
   */
+
   if (linuxthreads)
     wait(NULL);                               /* LinuxThreads were detected */
   else
@@ -239,11 +243,28 @@ static int start_process(Instance_options *instance_options,
 */
 
 static void start_and_monitor_instance(Instance_options *old_instance_options,
-                                       Instance_map *instance_map)
+                                       Instance_map *instance_map,
+                                       Thread_registry *thread_registry)
 {
   Instance_name instance_name(&old_instance_options->instance_name);
   Instance *current_instance;
   My_process_info process_info;
+  Thread_info thread_info(pthread_self(), FALSE);
+
+  log_info("Monitoring thread (instance: '%s'): started.",
+           (const char *) instance_name.get_c_str());
+
+  if (!old_instance_options->nonguarded)
+  {
+    /*
+      Register thread in Thread_registry to wait for it to stop on shutdown
+      only if instance is nuarded. If instance is guarded, the thread will not
+      finish, because nonguarded instances are not stopped on shutdown.
+    */
+
+    thread_registry->register_thread(&thread_info);
+    my_thread_init();
+  }
 
   /*
     Lock instance map to guarantee that no instances are deleted during
@@ -280,7 +301,14 @@ static void start_and_monitor_instance(Instance_options *old_instance_options,
 
   instance_map->unlock();
 
-  return;
+  if (!old_instance_options->nonguarded)
+  {
+    thread_registry->unregister_thread(&thread_info);
+    my_thread_end();
+  }
+
+  log_info("Monitoring thread (instance: '%s'): finished.",
+           (const char *) instance_name.get_c_str());
 }
 
 
@@ -343,10 +371,6 @@ int Instance::start()
   {
     remove_pid();
 
-    /*
-      No need to monitor this thread in the Thread_registry, as all
-      instances are to be stopped during shutdown.
-    */
     pthread_t proxy_thd_id;
     pthread_attr_t proxy_thd_attr;
     int rc;
@@ -404,7 +428,8 @@ void Instance::set_crash_flag_n_wake_all()
 
 
 
-Instance::Instance(): crashed(FALSE), configured(FALSE)
+Instance::Instance(Thread_registry &thread_registry_arg):
+  crashed(FALSE), configured(FALSE), thread_registry(thread_registry_arg)
 {
   pthread_mutex_init(&LOCK_instance, 0);
   pthread_cond_init(&COND_instance_stopped, 0);

server-tools/instance-manager/instance.h

@@ -27,6 +27,7 @@
 #endif
 
 class Instance_map;
+class Thread_registry;
 
 
 /*
@@ -87,7 +88,7 @@ class Instance
   static bool is_mysqld_compatible_name(const LEX_STRING *name);
 
 public:
-  Instance();
+  Instance(Thread_registry &thread_registry_arg);
 
   ~Instance();
   int init(const LEX_STRING *name_arg);
@@ -120,6 +121,7 @@ class Instance
 public:
   enum { DEFAULT_SHUTDOWN_DELAY= 35 };
   Instance_options options;
+  Thread_registry &thread_registry;
 
 private:
   /* This attributes is a flag, specifies if the instance has been crashed. */

server-tools/instance-manager/instance_map.cc

@@ -169,7 +169,7 @@ int Instance_map::process_one_option(const LEX_STRING *group,
   if (!(instance= (Instance *) hash_search(&hash, (byte *) group->str,
                                            group->length)))
   {
-    if (!(instance= new Instance()))
+    if (!(instance= new Instance(thread_registry)))
       return 1;
 
     if (instance->init(group) || add_instance(instance))
@@ -213,8 +213,10 @@ int Instance_map::process_one_option(const LEX_STRING *group,
 }
 
 
-Instance_map::Instance_map(const char *default_mysqld_path_arg):
-mysqld_path(default_mysqld_path_arg)
+Instance_map::Instance_map(const char *default_mysqld_path_arg,
+                           Thread_registry &thread_registry_arg):
+  mysqld_path(default_mysqld_path_arg),
+  thread_registry(thread_registry_arg)
 {
   pthread_mutex_init(&LOCK_instance_map, 0);
 }
@@ -333,7 +335,7 @@ int Instance_map::remove_instance(Instance *instance)
 int Instance_map::create_instance(const LEX_STRING *instance_name,
                                   const Named_value_arr *options)
 {
-  Instance *instance= new Instance();
+  Instance *instance= new Instance(thread_registry);
 
   if (!instance)
   {

server-tools/instance-manager/instance_map.h

@@ -28,6 +28,7 @@
 class Guardian_thread;
 class Instance;
 class Named_value_arr;
+class Thread_registry;
 
 extern int load_all_groups(char ***groups, const char *filename);
 extern void free_groups(char **groups);
@@ -104,7 +105,8 @@ class Instance_map
   int create_instance(const LEX_STRING *instance_name,
                       const Named_value_arr *options);
 
-  Instance_map(const char *default_mysqld_path_arg);
+  Instance_map(const char *default_mysqld_path_arg,
+               Thread_registry &thread_registry_arg);
   ~Instance_map();
 
   /*
@@ -130,6 +132,8 @@ class Instance_map
   enum { START_HASH_SIZE = 16 };
   pthread_mutex_t LOCK_instance_map;
   HASH hash;
+
+  Thread_registry &thread_registry;
 };
 
 #endif /* INCLUDES_MYSQL_INSTANCE_MANAGER_INSTANCE_MAP_H */

server-tools/instance-manager/listener.cc

@@ -87,7 +87,7 @@ class Listener_thread: public Listener_thread_args
 Listener_thread::Listener_thread(const Listener_thread_args &args) :
   Listener_thread_args(args.thread_registry, args.user_map, args.instance_map)
   ,total_connection_count(0)
-  ,thread_info(pthread_self())
+  ,thread_info(pthread_self(), TRUE)
   ,num_sockets(0)
 {
 }
@@ -112,6 +112,8 @@ void Listener_thread::run()
 {
   int i, n= 0;
 
+  log_info("Listener_thread: started.");
+
 #ifndef __WIN__
   /* we use this var to check whether we are running on LinuxThreads */
   pid_t thread_pid;
@@ -164,7 +166,7 @@ void Listener_thread::run()
     if (rc == 0 || rc == -1)
     {
       if (rc == -1 && errno != EINTR)
-        log_error("Listener_thread::run(): select() failed, %s",
+        log_error("Listener_thread: select() failed, %s",
                   strerror(errno));
       continue;
     }
@@ -198,7 +200,7 @@ void Listener_thread::run()
 
   /* III. Release all resources and exit */
 
-  log_info("Listener_thread::run(): shutdown requested, exiting...");
+  log_info("Listener_thread: shutdown requested, exiting...");
 
   for (i= 0; i < num_sockets; i++)
     close(sockets[i]);
@@ -209,6 +211,8 @@ void Listener_thread::run()
 
   thread_registry.unregister_thread(&thread_info);
   my_thread_end();
+
+  log_info("Listener_thread: finished.");
   return;
 
 err:
@@ -230,7 +234,7 @@ int Listener_thread::create_tcp_socket()
   int ip_socket= socket(AF_INET, SOCK_STREAM, 0);
   if (ip_socket == INVALID_SOCKET)
   {
-    log_error("Listener_thead::run(): socket(AF_INET) failed, %s",
+    log_error("Listener_thead: socket(AF_INET) failed, %s",
               strerror(errno));
     return -1;
   }
@@ -261,7 +265,7 @@ int Listener_thread::create_tcp_socket()
   if (bind(ip_socket, (struct sockaddr *) &ip_socket_address,
            sizeof(ip_socket_address)))
   {
-    log_error("Listener_thread::run(): bind(ip socket) failed, '%s'",
+    log_error("Listener_thread: bind(ip socket) failed, '%s'",
               strerror(errno));
     close(ip_socket);
     return -1;
@@ -269,7 +273,7 @@ int Listener_thread::create_tcp_socket()
 
   if (listen(ip_socket, LISTEN_BACK_LOG_SIZE))
   {
-    log_error("Listener_thread::run(): listen(ip socket) failed, %s",
+    log_error("Listener_thread: listen(ip socket) failed, %s",
               strerror(errno));
     close(ip_socket);
     return -1;
@@ -294,7 +298,7 @@ create_unix_socket(struct sockaddr_un &unix_socket_address)
   int unix_socket= socket(AF_UNIX, SOCK_STREAM, 0);
   if (unix_socket == INVALID_SOCKET)
   {
-    log_error("Listener_thead::run(): socket(AF_UNIX) failed, %s",
+    log_error("Listener_thead: socket(AF_UNIX) failed, %s",
               strerror(errno));
     return -1;
   }
@@ -314,7 +318,7 @@ create_unix_socket(struct sockaddr_un &unix_socket_address)
   if (bind(unix_socket, (struct sockaddr *) &unix_socket_address,
            sizeof(unix_socket_address)))
   {
-    log_error("Listener_thread::run(): bind(unix socket) failed, "
+    log_error("Listener_thread: bind(unix socket) failed, "
               "socket file name is '%s', error '%s'",
               unix_socket_address.sun_path, strerror(errno));
     close(unix_socket);
@@ -325,7 +329,7 @@ create_unix_socket(struct sockaddr_un &unix_socket_address)
 
   if (listen(unix_socket, LISTEN_BACK_LOG_SIZE))
   {
-    log_error("Listener_thread::run(): listen(unix socket) failed, %s",
+    log_error("Listener_thread: listen(unix socket) failed, %s",
               strerror(errno));
     close(unix_socket);
     return -1;

server-tools/instance-manager/log.cc

@@ -52,14 +52,16 @@ static inline void log(FILE *file,  const char *format, va_list args)
   struct tm bd_time;                            // broken-down time
   localtime_r(&now, &bd_time);
 
-  char buff_date[32];
-  sprintf(buff_date, "%02d%02d%02d %2d:%02d:%02d\t",
-                            bd_time.tm_year % 100,
-                            bd_time.tm_mon + 1,
-                            bd_time.tm_mday,
-                            bd_time.tm_hour,
-                            bd_time.tm_min,
-                            bd_time.tm_sec);
+  char buff_date[128];
+  sprintf(buff_date, "[%d/%lu] [%02d/%02d/%02d %02d:%02d:%02d] ",
+          (int) getpid(),
+          (unsigned long) pthread_self(),
+          bd_time.tm_year % 100,
+          bd_time.tm_mon + 1,
+          bd_time.tm_mday,
+          bd_time.tm_hour,
+          bd_time.tm_min,
+          bd_time.tm_sec);
   /* Format the message */
   char buff_stack[256];
 

server-tools/instance-manager/manager.cc

@@ -156,7 +156,8 @@ void manager()
   */
 
   User_map user_map;
-  Instance_map instance_map(Options::Main::default_mysqld_path);
+  Instance_map instance_map(Options::Main::default_mysqld_path,
+                            thread_registry);
   Guardian_thread guardian_thread(thread_registry,
                                   &instance_map,
                                   Options::Main::monitoring_interval);
@@ -308,6 +309,8 @@ void manager()
   */
   pthread_cond_signal(&guardian_thread.COND_guardian);
 
+  log_info("Main loop: started.");
+
   while (!shutdown_complete)
   {
     int signo;
@@ -320,6 +323,20 @@ void manager()
       goto err;
     }
 
+    /*
+      The general idea in this loop is the following:
+        - we are waiting for SIGINT, SIGTERM -- signals that mean we should
+          shutdown;
+        - as shutdown signal is caught, we stop Guardian thread (by calling
+          Guardian_thread::request_shutdown());
+        - as Guardian_thread is stopped, it sends SIGTERM to this thread
+          (by calling Thread_registry::request_shutdown()), so that the
+          my_sigwait() above returns;
+        - as we catch the second SIGTERM, we send signals to all threads
+          registered in Thread_registry (by calling
+          Thread_registry::deliver_shutdown()) and waiting for threads to stop;
+    */
+
 #ifndef __WIN__
 /*
   On some Darwin kernels SIGHUP is delivered along with most
@@ -336,6 +353,8 @@ void manager()
     else
 #endif
     {
+      log_info("Main loop: got shutdown signal.");
+
       if (!guardian_thread.is_stopped())
       {
         guardian_thread.request_shutdown();
@@ -349,6 +368,8 @@ void manager()
     }
   }
 
+  log_info("Main loop: finished.");
+
 err:
   /* delete the pid file */
   my_delete(Options::Main::pid_file_name, MYF(0));

server-tools/instance-manager/mysql_connection.cc

@@ -97,7 +97,7 @@ Mysql_connection_thread::Mysql_connection_thread(
                                args.user_map,
                                args.connection_id,
                                args.instance_map)
-  ,thread_info(pthread_self())
+  ,thread_info(pthread_self(), TRUE)
 {
   thread_registry.register_thread(&thread_info);
 }
@@ -165,7 +165,7 @@ Mysql_connection_thread::~Mysql_connection_thread()
 
 void Mysql_connection_thread::run()
 {
-  log_info("accepted mysql connection %d", connection_id);
+  log_info("accepted mysql connection %d", (int) connection_id);
 
   my_thread_init();
 
@@ -175,7 +175,7 @@ void Mysql_connection_thread::run()
     return;
   }
 
-  log_info("connection %d is checked successfully", connection_id);
+  log_info("connection %d is checked successfully", (int) connection_id);
 
   vio_keepalive(vio, TRUE);
 
@@ -315,7 +315,7 @@ int Mysql_connection_thread::do_command()
     enum enum_server_command command= (enum enum_server_command)
                                       (uchar) *packet;
     log_info("connection %d: packet_length=%d, command=%d",
-             connection_id, packet_length, command);
+             (int) connection_id, (int) packet_length, (int) command);
     return dispatch_command(command, packet + 1, packet_length - 1);
   }
 }
@@ -325,27 +325,33 @@ int Mysql_connection_thread::dispatch_command(enum enum_server_command command,
 {
   switch (command) {
   case COM_QUIT:                                // client exit
-    log_info("query for connection %d received quit command", connection_id);
+    log_info("query for connection %d received quit command",
+             (int) connection_id);
     return 1;
   case COM_PING:
-    log_info("query for connection %d received ping command", connection_id);
+    log_info("query for connection %d received ping command",
+             (int) connection_id);
     net_send_ok(&net, connection_id, NULL);
     break;
   case COM_QUERY:
   {
     log_info("query for connection %d : ----\n%s\n-------------------------",
-	     connection_id,packet);
+	     (int) connection_id,
+             (const char *) packet);
     if (Command *command= parse_command(&instance_map, packet))
     {
       int res= 0;
-      log_info("query for connection %d successfully parsed",connection_id);
+      log_info("query for connection %d successfully parsed",
+               (int) connection_id);
       res= command->execute(&net, connection_id);
       delete command;
       if (!res)
-        log_info("query for connection %d executed ok",connection_id);
+        log_info("query for connection %d executed ok",
+                 (int) connection_id);
       else
       {
-        log_info("query for connection %d executed err=%d",connection_id,res);
+        log_info("query for connection %d executed err=%d",
+                 (int) connection_id, (int) res);
         net_send_error(&net, res);
         return 0;
       }
@@ -358,7 +364,8 @@ int Mysql_connection_thread::dispatch_command(enum enum_server_command command,
     break;
   }
   default:
-    log_info("query for connection %d received unknown command",connection_id);
+    log_info("query for connection %d received unknown command",
+             (int) connection_id);
     net_send_error(&net, ER_UNKNOWN_COM_ERROR);
     break;
   }

server-tools/instance-manager/thread_registry.cc

@@ -43,8 +43,10 @@ static void handle_signal(int __attribute__((unused)) sig_no)
 */
 
 Thread_info::Thread_info() {}
-Thread_info::Thread_info(pthread_t thread_id_arg) :
-  thread_id(thread_id_arg) {}
+Thread_info::Thread_info(pthread_t thread_id_arg,
+                         bool send_signal_on_shutdown_arg) :
+  thread_id(thread_id_arg),
+  send_signal_on_shutdown(send_signal_on_shutdown_arg) {}
 
 /*
   TODO: think about moving signal information (now it's shutdown_in_progress)
@@ -86,6 +88,9 @@ Thread_registry::~Thread_registry()
 
 void Thread_registry::register_thread(Thread_info *info)
 {
+  log_info("Thread_registry: registering thread %d...",
+           (int) info->thread_id);
+
 #ifndef __WIN__
   struct sigaction sa;
   sa.sa_handler= handle_signal;
@@ -112,11 +117,19 @@ void Thread_registry::register_thread(Thread_info *info)
 
 void Thread_registry::unregister_thread(Thread_info *info)
 {
+  log_info("Thread_registry: unregistering thread %d...",
+           (int) info->thread_id);
+
   pthread_mutex_lock(&LOCK_thread_registry);
   info->prev->next= info->next;
   info->next->prev= info->prev;
+
   if (head.next == &head)
+  {
+    log_info("Thread_registry: thread registry is empty!");
     pthread_cond_signal(&COND_thread_registry_is_empty);
+  }
+
   pthread_mutex_unlock(&LOCK_thread_registry);
 }
 
@@ -181,11 +194,6 @@ int Thread_registry::cond_timedwait(Thread_info *info, pthread_cond_t *cond,
 
 void Thread_registry::deliver_shutdown()
 {
-  Thread_info *info;
-  struct timespec shutdown_time;
-  int error;
-  set_timespec(shutdown_time, 1);
-
   pthread_mutex_lock(&LOCK_thread_registry);
   shutdown_in_progress= TRUE;
 
@@ -199,29 +207,14 @@ void Thread_registry::deliver_shutdown()
   process_alarm(THR_SERVER_ALARM);
 #endif
 
-  for (info= head.next; info != &head; info= info->next)
-  {
-    pthread_kill(info->thread_id, THREAD_KICK_OFF_SIGNAL);
-    /*
-      sic: race condition here, the thread may not yet fall into
-      pthread_cond_wait.
-    */
-    if (info->current_cond)
-      pthread_cond_signal(info->current_cond);
-  }
   /*
-    The common practice is to test predicate before pthread_cond_wait.
-    I don't do that here because the predicate is practically always false
-    before wait - is_shutdown's been just set, and the lock's still not
-    released - the only case when the predicate is false is when no other
-    threads exist.
+    sic: race condition here, the thread may not yet fall into
+    pthread_cond_wait.
   */
-  while (((error= pthread_cond_timedwait(&COND_thread_registry_is_empty,
-                                          &LOCK_thread_registry,
-                                          &shutdown_time)) != ETIMEDOUT &&
-          error != ETIME) &&
-         head.next != &head)
-    ;
+
+  interrupt_threads();
+
+  wait_for_threads_to_unregister();
 
   /*
     If previous signals did not reach some threads, they must be sleeping
@@ -230,11 +223,28 @@ void Thread_registry::deliver_shutdown()
     so this time everybody should be informed (presumably each worker can
     get CPU during shutdown_time.)
   */
-  for (info= head.next; info != &head; info= info->next)
+
+  interrupt_threads();
+
+  /* Get the last chance to threads to stop. */
+
+  wait_for_threads_to_unregister();
+
+  /*
+    Print out threads, that didn't stopped. Thread_registry destructor will
+    probably abort the program if there is still any alive thread.
+  */
+
+  if (head.next != &head)
   {
-    pthread_kill(info->thread_id, THREAD_KICK_OFF_SIGNAL);
-    if (info->current_cond)
-      pthread_cond_signal(info->current_cond);
+    log_info("Thread_registry: non-stopped threads:");
+
+    for (Thread_info *info= head.next; info != &head; info= info->next)
+      log_info("  - %ld", (long int) info->thread_id);
+  }
+  else
+  {
+    log_info("Thread_registry: all threads stopped.");
   }
 
   pthread_mutex_unlock(&LOCK_thread_registry);
@@ -245,3 +255,46 @@ void Thread_registry::request_shutdown()
 {
   pthread_kill(sigwait_thread_pid, SIGTERM);
 }
+
+
+void Thread_registry::interrupt_threads()
+{
+  for (Thread_info *info= head.next; info != &head; info= info->next)
+  {
+    if (!info->send_signal_on_shutdown)
+      continue;
+
+    pthread_kill(info->thread_id, THREAD_KICK_OFF_SIGNAL);
+    if (info->current_cond)
+      pthread_cond_signal(info->current_cond);
+  }
+}
+
+
+void Thread_registry::wait_for_threads_to_unregister()
+{
+  struct timespec shutdown_time;
+
+  set_timespec(shutdown_time, 1);
+
+  log_info("Thread_registry: joining threads...");
+
+  while (true)
+  {
+    if (head.next == &head)
+    {
+      log_info("Thread_registry: emptied.");
+      return;
+    }
+
+    int error= pthread_cond_timedwait(&COND_thread_registry_is_empty,
+                                      &LOCK_thread_registry,
+                                      &shutdown_time);
+
+    if (error == ETIMEDOUT || error == ETIME)
+    {
+      log_info("Thread_registry: threads shutdown timed out.");
+      return;
+    }
+  }
+}

server-tools/instance-manager/thread_registry.h

@@ -67,13 +67,17 @@
 class Thread_info
 {
 public:
-  Thread_info();
-  Thread_info(pthread_t thread_id_arg);
+  Thread_info(pthread_t thread_id_arg, bool send_signal_on_shutdown_arg);
   friend class Thread_registry;
+
+private:
+  Thread_info();
+
 private:
   pthread_cond_t *current_cond;
   Thread_info *prev, *next;
   pthread_t thread_id;
+  bool send_signal_on_shutdown;
 };
 
 
@@ -97,6 +101,10 @@ class Thread_registry
                  pthread_mutex_t *mutex);
   int cond_timedwait(Thread_info *info, pthread_cond_t *cond,
                      pthread_mutex_t *mutex, struct timespec *wait_time);
+private:
+  void interrupt_threads();
+  void wait_for_threads_to_unregister();
+
 private:
   Thread_info head;
   bool shutdown_in_progress;