Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 478 insertions, 0 deletions

diff --git a/mysys/my_thr_init.c b/mysys/my_thr_init.c
new file mode 100644
index 00000000..24b4b3af
--- /dev/null
+++ b/mysys/my_thr_init.c
@@ -0,0 +1,478 @@
+/* Copyright (c) 2000, 2011 Oracle and/or its affiliates.
+   Copyright 2008-2011 Monty Program Ab
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+/*
+  Functions to handle initializating and allocationg of all mysys & debug
+  thread variables.
+*/
+
+#include "mysys_priv.h"
+#include <m_string.h>
+#include <signal.h>
+
+pthread_key(struct st_my_thread_var*, THR_KEY_mysys);
+mysql_mutex_t THR_LOCK_malloc, THR_LOCK_open,
+              THR_LOCK_lock, THR_LOCK_myisam, THR_LOCK_heap,
+              THR_LOCK_net, THR_LOCK_charset, THR_LOCK_threads,
+              THR_LOCK_myisam_mmap;
+
+mysql_cond_t  THR_COND_threads;
+uint            THR_thread_count= 0;
+uint 		my_thread_end_wait_time= 5;
+#if !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R)
+mysql_mutex_t LOCK_localtime_r;
+#endif
+#ifdef _MSC_VER
+static void install_sigabrt_handler();
+#endif
+
+/** True if @c my_thread_global_init() has been called. */
+static my_bool my_thread_global_init_done= 0;
+/* True if THR_KEY_mysys is created */
+my_bool my_thr_key_mysys_exists= 0;
+
+
+/*
+  These are mutexes not used by safe_mutex or my_thr_init.c
+
+  We want to free these earlier than other mutex so that safe_mutex
+  can detect if all mutex and memory is freed properly.
+*/
+
+static void my_thread_init_common_mutex(void)
+{
+  mysql_mutex_init(key_THR_LOCK_open, &THR_LOCK_open, MY_MUTEX_INIT_FAST);
+  mysql_mutex_init(key_THR_LOCK_lock, &THR_LOCK_lock, MY_MUTEX_INIT_FAST);
+  mysql_mutex_init(key_THR_LOCK_myisam, &THR_LOCK_myisam, MY_MUTEX_INIT_SLOW);
+  mysql_mutex_init(key_THR_LOCK_myisam_mmap, &THR_LOCK_myisam_mmap, MY_MUTEX_INIT_FAST);
+  mysql_mutex_init(key_THR_LOCK_heap, &THR_LOCK_heap, MY_MUTEX_INIT_FAST);
+  mysql_mutex_init(key_THR_LOCK_net, &THR_LOCK_net, MY_MUTEX_INIT_FAST);
+  mysql_mutex_init(key_THR_LOCK_charset, &THR_LOCK_charset, MY_MUTEX_INIT_FAST);
+#if !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R)
+  mysql_mutex_init(key_LOCK_localtime_r, &LOCK_localtime_r, MY_MUTEX_INIT_SLOW);
+#endif
+}
+
+void my_thread_destroy_common_mutex(void)
+{
+  mysql_mutex_destroy(&THR_LOCK_open);
+  mysql_mutex_destroy(&THR_LOCK_lock);
+  mysql_mutex_destroy(&THR_LOCK_myisam);
+  mysql_mutex_destroy(&THR_LOCK_myisam_mmap);
+  mysql_mutex_destroy(&THR_LOCK_heap);
+  mysql_mutex_destroy(&THR_LOCK_net);
+  mysql_mutex_destroy(&THR_LOCK_charset);
+#if !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R)
+  mysql_mutex_destroy(&LOCK_localtime_r);
+#endif
+}
+
+
+/*
+  These mutexes are used by my_thread_init() and after
+  my_thread_destroy_mutex()
+*/
+
+static void my_thread_init_internal_mutex(void)
+{
+  mysql_mutex_init(key_THR_LOCK_threads, &THR_LOCK_threads, MY_MUTEX_INIT_FAST);
+  mysql_mutex_init(key_THR_LOCK_malloc, &THR_LOCK_malloc, MY_MUTEX_INIT_FAST);
+  mysql_cond_init(key_THR_COND_threads, &THR_COND_threads, NULL);
+}
+
+void my_thread_destroy_internal_mutex(void)
+{
+  mysql_mutex_destroy(&THR_LOCK_threads);
+  mysql_mutex_destroy(&THR_LOCK_malloc);
+  mysql_cond_destroy(&THR_COND_threads);
+}
+
+static void my_thread_init_thr_mutex(struct st_my_thread_var *var)
+{
+  mysql_mutex_init(key_my_thread_var_mutex, &var->mutex, MY_MUTEX_INIT_FAST);
+  mysql_cond_init(key_my_thread_var_suspend, &var->suspend, NULL);
+}
+
+static void my_thread_destory_thr_mutex(struct st_my_thread_var *var)
+{
+  mysql_mutex_destroy(&var->mutex);
+  mysql_cond_destroy(&var->suspend);
+}
+
+
+/**
+  Re-initialize components initialized early with @c my_thread_global_init.
+  Some mutexes were initialized before the instrumentation.
+  Destroy + create them again, now that the instrumentation
+  is in place.
+  This is safe, since this function() is called before creating new threads,
+  so the mutexes are not in use.
+*/
+void my_thread_global_reinit(void)
+{
+  struct st_my_thread_var *tmp;
+
+  DBUG_ASSERT(my_thread_global_init_done);
+
+#ifdef HAVE_PSI_INTERFACE
+  my_init_mysys_psi_keys();
+#endif
+
+  my_thread_destroy_common_mutex();
+  my_thread_init_common_mutex();
+
+  my_thread_destroy_internal_mutex();
+  my_thread_init_internal_mutex();
+
+  tmp= my_thread_var;
+  DBUG_ASSERT(tmp);
+
+  my_thread_destory_thr_mutex(tmp);
+  my_thread_init_thr_mutex(tmp);
+}
+
+/*
+  initialize thread environment
+
+  SYNOPSIS
+    my_thread_global_init()
+
+  RETURN
+    0  ok
+    1  error (Couldn't create THR_KEY_mysys)
+*/
+
+my_bool my_thread_global_init(void)
+{
+  int pth_ret;
+
+  /* Normally this should never be called twice */
+  DBUG_ASSERT(my_thread_global_init_done == 0);
+  if (my_thread_global_init_done)
+    return 0;
+  my_thread_global_init_done= 1;
+
+  /*
+    THR_KEY_mysys is deleted in my_end() as DBUG libraries are using it even
+    after my_thread_global_end() is called.
+    my_thr_key_mysys_exist is used to protect against application like QT
+    that calls my_thread_global_init() + my_thread_global_end() multiple times
+    without calling my_init() + my_end().
+  */
+  if (!my_thr_key_mysys_exists &&
+      (pth_ret= pthread_key_create(&THR_KEY_mysys, NULL)) != 0)
+  {
+    fprintf(stderr, "Can't initialize threads: error %d\n", pth_ret);
+    return 1;
+  }
+  my_thr_key_mysys_exists= 1;
+
+  /* Mutex used by my_thread_init() and after my_thread_destroy_mutex() */
+  my_thread_init_internal_mutex();
+
+  if (my_thread_init())
+    return 1;
+
+
+  my_thread_init_common_mutex();
+
+  return 0;
+}
+
+
+/**
+   End the mysys thread system. Called when ending the last thread
+*/
+
+void my_thread_global_end(void)
+{
+  struct timespec abstime;
+  my_bool all_threads_killed= 1;
+
+  set_timespec(abstime, my_thread_end_wait_time);
+  mysql_mutex_lock(&THR_LOCK_threads);
+  while (THR_thread_count > 0)
+  {
+    int error= mysql_cond_timedwait(&THR_COND_threads, &THR_LOCK_threads,
+                                    &abstime);
+    if (error == ETIMEDOUT || error == ETIME)
+    {
+#ifdef HAVE_PTHREAD_KILL
+      /*
+        We shouldn't give an error here, because if we don't have
+        pthread_kill(), programs like mysqld can't ensure that all threads
+        are killed when we enter here.
+      */
+      if (THR_thread_count)
+        fprintf(stderr,
+                "Error in my_thread_global_end(): %d threads didn't exit\n",
+                THR_thread_count);
+#endif
+      all_threads_killed= 0;
+      break;
+    }
+  }
+  mysql_mutex_unlock(&THR_LOCK_threads);
+
+  my_thread_destroy_common_mutex();
+
+  /*
+    Only destroy the mutex & conditions if we don't have other threads around
+    that could use them.
+  */
+  if (all_threads_killed)
+  {
+    my_thread_destroy_internal_mutex();
+  }
+  my_thread_global_init_done= 0;
+}
+
+static my_thread_id thread_id= 0;
+
+/*
+  Allocate thread specific memory for the thread, used by mysys and dbug
+
+  SYNOPSIS
+    my_thread_init()
+
+  NOTES
+    We can't use mutex_locks here if we are using windows as
+    we may have compiled the program with SAFE_MUTEX, in which
+    case the checking of mutex_locks will not work until
+    the pthread_self thread specific variable is initialized.
+
+   This function may called multiple times for a thread, for example
+   if one uses my_init() followed by mysql_server_init().
+
+  RETURN
+    0  ok
+    1  Fatal error; mysys/dbug functions can't be used
+*/
+
+my_bool my_thread_init(void)
+{
+  struct st_my_thread_var *tmp;
+  my_bool error=0;
+
+  if (!my_thread_global_init_done)
+    return 1; /* cannot proceed with uninitialized library */
+
+#ifdef EXTRA_DEBUG_THREADS
+  fprintf(stderr,"my_thread_init(): pthread_self: %p\n", pthread_self());
+#endif  
+
+  if (my_thread_var)
+  {
+#ifdef EXTRA_DEBUG_THREADS
+    fprintf(stderr,"my_thread_init() called more than once in thread 0x%lx\n",
+            (long) pthread_self());
+#endif    
+    goto end;
+  }
+
+#ifdef _MSC_VER
+  install_sigabrt_handler();
+#endif
+
+  if (!(tmp= (struct st_my_thread_var *) calloc(1, sizeof(*tmp))))
+  {
+    error= 1;
+    goto end;
+  }
+  set_mysys_var(tmp);
+  tmp->pthread_self= pthread_self();
+  my_thread_init_thr_mutex(tmp);
+
+  tmp->stack_ends_here= (char*)&tmp +
+                         STACK_DIRECTION * (long)my_thread_stack_size;
+
+  mysql_mutex_lock(&THR_LOCK_threads);
+  tmp->id= tmp->dbug_id= ++thread_id;
+  ++THR_thread_count;
+  mysql_mutex_unlock(&THR_LOCK_threads);
+  tmp->init= 1;
+#ifndef DBUG_OFF
+  /* Generate unique name for thread */
+  (void) my_thread_name();
+#endif
+
+end:
+  return error;
+}
+
+
+/*
+  Deallocate memory used by the thread for book-keeping
+
+  SYNOPSIS
+    my_thread_end()
+
+  NOTE
+    This may be called multiple times for a thread.
+    This happens for example when one calls 'mysql_server_init()'
+    mysql_server_end() and then ends with a mysql_end().
+*/
+
+void my_thread_end(void)
+{
+  struct st_my_thread_var *tmp;
+  tmp= my_thread_var;
+
+#ifdef EXTRA_DEBUG_THREADS
+  fprintf(stderr,"my_thread_end(): tmp: %p  pthread_self: %p  thread_id: %ld\n",
+	  tmp, pthread_self(), tmp ? (long) tmp->id : 0L);
+#endif  
+
+  /*
+    Remove the instrumentation for this thread.
+    This must be done before trashing st_my_thread_var,
+    because the LF_HASH depends on it.
+  */
+  PSI_CALL_delete_current_thread();
+
+  /*
+    We need to disable DBUG early for this thread to ensure that the
+    the mutex calls doesn't enable it again
+    To this we have to both do DBUG_POP() and also reset THR_KEY_mysys
+    as the key is used by DBUG.
+  */
+  DBUG_POP();
+  set_mysys_var(NULL);
+
+  if (tmp && tmp->init)
+  {
+#if !defined(DBUG_OFF)
+    /* tmp->dbug is allocated inside DBUG library */
+    if (tmp->dbug)
+    {
+      free(tmp->dbug);
+      tmp->dbug=0;
+    }
+#endif
+    my_thread_destory_thr_mutex(tmp);
+
+    /*
+      Decrement counter for number of running threads. We are using this
+      in my_thread_global_end() to wait until all threads have called
+      my_thread_end and thus freed all memory they have allocated in
+      my_thread_init() and DBUG_xxxx
+    */
+    mysql_mutex_lock(&THR_LOCK_threads);
+    DBUG_ASSERT(THR_thread_count != 0);
+    if (--THR_thread_count == 0)
+      mysql_cond_signal(&THR_COND_threads);
+    mysql_mutex_unlock(&THR_LOCK_threads);
+
+    /* Trash variable so that we can detect false accesses to my_thread_var */
+    tmp->init= 2;
+    free(tmp);
+  }
+}
+
+struct st_my_thread_var *_my_thread_var(void)
+{
+  return  my_pthread_getspecific(struct st_my_thread_var*,THR_KEY_mysys);
+}
+
+int set_mysys_var(struct st_my_thread_var *mysys_var)
+{
+  return my_pthread_setspecific_ptr(THR_KEY_mysys, mysys_var);
+}
+
+/****************************************************************************
+  Get name of current thread.
+****************************************************************************/
+
+my_thread_id my_thread_dbug_id()
+{
+  /*
+    We need to do this test as some system thread may not yet have called
+    my_thread_init().
+  */
+  struct st_my_thread_var *tmp= my_thread_var;
+  return tmp ? tmp->dbug_id : 0;
+}
+
+#ifdef DBUG_OFF
+const char *my_thread_name(void)
+{
+  return "no_name";
+}
+
+#else
+
+const char *my_thread_name(void)
+{
+  char name_buff[100];
+  struct st_my_thread_var *tmp=my_thread_var;
+  if (!tmp->name[0])
+  {
+    my_thread_id id= my_thread_dbug_id();
+    sprintf(name_buff,"T@%lu", (ulong) id);
+    strmake_buf(tmp->name, name_buff);
+  }
+  return tmp->name;
+}
+
+/* Return pointer to DBUG for holding current state */
+
+extern void **my_thread_var_dbug()
+{
+  struct st_my_thread_var *tmp;
+  if (!my_thread_global_init_done)
+    return NULL;
+  tmp= my_thread_var;
+  return tmp && tmp->init ? &tmp->dbug : 0;
+}
+#endif /* DBUG_OFF */
+
+/* Return pointer to mutex_in_use */
+
+safe_mutex_t **my_thread_var_mutex_in_use()
+{
+  struct st_my_thread_var *tmp;
+  if (!my_thread_global_init_done)
+    return NULL;
+  tmp= my_thread_var;
+  return tmp ? &tmp->mutex_in_use : 0;
+}
+
+#ifdef _WIN32
+/*
+  In Visual Studio 2005 and later, default SIGABRT handler will overwrite
+  any unhandled exception filter set by the application  and will try to
+  call JIT debugger. This is not what we want, this we calling __debugbreak
+  to stop in debugger, if process is being debugged or to generate 
+  EXCEPTION_BREAKPOINT and then handle_segfault will do its magic.
+*/
+
+#if (_MSC_VER >= 1400)
+static void my_sigabrt_handler(int sig)
+{
+  __debugbreak();
+}
+#endif /*_MSC_VER >=1400 */
+
+static void install_sigabrt_handler(void)
+{
+#if (_MSC_VER >=1400)
+  /*abort() should not override our exception filter*/
+  _set_abort_behavior(0,_CALL_REPORTFAULT);
+  signal(SIGABRT,my_sigabrt_handler);
+#endif /* _MSC_VER >=1400 */
+}
+#endif
+