Merge bk-internal.mysql.com:/home/bk/mysql-4.1

into neptunus.(none):/home/msvensson/mysql/mysql-4.1


configure.in:
  Auto merged

17 files changed, 244 insertions, 99 deletions

diff --git a/acinclude.m4 b/acinclude.m4
index 61b37294377..f868489f2d2 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1005,7 +1005,7 @@ AC_DEFUN([MYSQL_FIND_OPENSSL], [
  if test -z "$OPENSSL_LIB" -o -z "$OPENSSL_INCLUDE" ; then
    echo "Could not find an installation of OpenSSL"
    if test -n "$OPENSSL_LIB" ; then
-    if test "$IS_LINUX" = "true"; then
+    if test "$TARGET_LINUX" = "true"; then
       echo "Looks like you've forgotten to install OpenSSL development RPM"
     fi
    fi
diff --git a/configure.in b/configure.in
index bc058265b9a..e90bea90dad 100644
--- a/configure.in
+++ b/configure.in
@@ -410,15 +410,16 @@ AC_MSG_CHECKING("if we should use 'skip-locking' as default for $target_os")
 if expr "$target_os" : "[[Ll]]inux.*" > /dev/null
 then
   MYSQLD_DEFAULT_SWITCHES="--skip-locking"
-  IS_LINUX="true"
-  AC_MSG_RESULT("yes");
+  TARGET_LINUX="true"
+  AC_MSG_RESULT("yes")
+  AC_DEFINE([TARGET_OS_LINUX], [1], [Whether we build for Linux])
 else
   MYSQLD_DEFAULT_SWITCHES=""
-  IS_LINUX="false"
-  AC_MSG_RESULT("no");
+  TARGET_LINUX="false"
+  AC_MSG_RESULT("no")
 fi
 AC_SUBST(MYSQLD_DEFAULT_SWITCHES)
-AC_SUBST(IS_LINUX)
+AC_SUBST(TARGET_LINUX)
 
 dnl Find paths to some shell programs
 AC_PATH_PROG(LN, ln, ln)
@@ -607,7 +608,7 @@ AC_SUBST(NOINST_LDFLAGS)
 # (this is true on the MySQL build machines to avoid NSS problems)
 #
 
-if test "$IS_LINUX" = "true" -a "$static_nss" = ""
+if test "$TARGET_LINUX" = "true" -a "$static_nss" = ""
 then
   tmp=`nm /usr/lib/libc.a  | grep _nss_files_getaliasent_r`
   if test -n "$tmp"
@@ -841,7 +842,7 @@ struct request_info *req;
 ])
 AC_SUBST(WRAPLIBS)
 
-if test "$IS_LINUX" = "true"; then
+if test "$TARGET_LINUX" = "true"; then
   AC_MSG_CHECKING([for atomic operations])
 
   atom_ops=
@@ -885,7 +886,7 @@ int main()
     [ USE_PSTACK=no ])
   pstack_libs=
   pstack_dirs=
-  if test "$USE_PSTACK" = yes -a "$IS_LINUX" = "true" -a "$BASE_MACHINE_TYPE" = "i386" -a "$with_mit_threads" = "no"
+  if test "$USE_PSTACK" = yes -a "$TARGET_LINUX" = "true" -a "$BASE_MACHINE_TYPE" = "i386" -a "$with_mit_threads" = "no"
   then
     have_libiberty= have_libbfd=
     my_save_LIBS="$LIBS"
@@ -1266,61 +1267,93 @@ esac
 # We have to check libc last because else it fails on Solaris 2.6
 
 with_posix_threads="no"
-# Hack for DEC-UNIX (OSF1)
+# Search thread lib on Linux
 if test "$with_named_thread" = "no" -a "$with_mit_threads" = "no"
 then
-  # Look for LinuxThreads.
-  AC_MSG_CHECKING("LinuxThreads")
-    res=`grep Linuxthreads /usr/include/pthread.h 2>/dev/null | wc -l`
-    if test "$res" -gt 0
+    AC_MSG_CHECKING("Linux threads")
+    if test "$TARGET_LINUX" = "true"
     then
-      AC_MSG_RESULT("Found")
-      AC_DEFINE([HAVE_LINUXTHREADS], [1],
-                [Whether we are using Xavier Leroy's LinuxThreads])
-      # Linux 2.0 sanity check
-      AC_TRY_COMPILE([#include <sched.h>], [int a = sched_get_priority_min(1);], ,
-      AC_MSG_ERROR([Syntax error in sched.h. Change _P to __P in the /usr/include/sched.h file. See the Installation chapter in the Reference Manual]))
-      # RedHat 5.0 does not work with dynamic linking of this. -static also
-      # gives a speed increase in linux so it does not hurt on other systems.
-      with_named_thread="-lpthread"
-    else
-      AC_MSG_RESULT("Not found")
-      # If this is a linux machine we should barf
-      if test "$IS_LINUX" = "true"
-      then
-	AC_MSG_ERROR([This is a linux system and Linuxthreads was not
-found. On linux Linuxthreads should be used.  Please install Linuxthreads
-(or a new glibc) and try again.  See the Installation chapter in the
-Reference Manual for more information.])
-      else
-	AC_MSG_CHECKING("DEC threads")
-        if test -f /usr/shlib/libpthread.so -a -f /usr/lib/libmach.a -a -f /usr/ccs/lib/cmplrs/cc/libexc.a
-	then
-	  with_named_thread="-lpthread -lmach -lexc"
-	  CFLAGS="$CFLAGS -D_REENTRANT"
-	  CXXFLAGS="$CXXFLAGS -D_REENTRANT"
-	  AC_DEFINE(HAVE_DEC_THREADS, [1],
-                    [Whether we are using DEC threads])
-	  AC_MSG_RESULT("yes")
-	else
-	  AC_MSG_RESULT("no")
-	  AC_MSG_CHECKING("DEC 3.2 threads")
-          if test -f /usr/shlib/libpthreads.so -a -f /usr/lib/libmach.a -a -f /usr/ccs/lib/cmplrs/cc/libexc.a
-	  then
-	    with_named_thread="-lpthreads -lmach -lc_r"
-	    AC_DEFINE(HAVE_DEC_THREADS, [1])
-            AC_DEFINE([HAVE_DEC_3_2_THREADS], [1],
-                      [Whether we are using OSF1 DEC threads on 3.2])
-            with_osf32_threads="yes"
-            MYSQLD_DEFAULT_SWITCHES="--skip-thread-priority"
-	    AC_MSG_RESULT("yes")
-	  else
-	    AC_MSG_RESULT("no")
+        AC_MSG_RESULT("starting")
+        # use getconf to check glibc contents
+        AC_MSG_CHECKING("getconf GNU_LIBPTHREAD_VERSION")
+        case `getconf GNU_LIBPTHREAD_VERSION | tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ` in
+        NPTL* )
+                AC_MSG_RESULT("NPTL")
+                AC_DEFINE([HAVE_NPTL], [1], [NPTL threads implementation])
+                with_named_thread="-lpthread"
+                ;;
+        LINUXTHREADS* )
+                AC_MSG_RESULT("Linuxthreads")
+                AC_DEFINE([HAVE_LINUXTHREADS], [1], 
+                      [Whether we are using Xavier Leroy's LinuxThreads])
+                with_named_thread="-lpthread"
+                ;;
+        * )
+                AC_MSG_RESULT("unknown")
+                ;;
+        esac
+        if test "$with_named_thread" = "no"
+        then
+          # old method, check headers
+          # Look for LinuxThreads.
+          AC_MSG_CHECKING("LinuxThreads in header file comment")
+          res=`grep Linuxthreads /usr/include/pthread.h 2>/dev/null | wc -l`
+          if test "$res" -gt 0
+          then
+            AC_MSG_RESULT("Found")
+            AC_DEFINE([HAVE_LINUXTHREADS], [1],
+                  [Whether we are using Xavier Leroy's LinuxThreads])
+            # Linux 2.0 sanity check
+            AC_TRY_COMPILE([#include <sched.h>], [int a = sched_get_priority_min(1);], ,
+                  AC_MSG_ERROR([Syntax error in sched.h. Change _P to __P in the /usr/include/sched.h file. See the Installation chapter in the Reference Manual]))
+            # RedHat 5.0 does not work with dynamic linking of this. -static also
+            # gives a speed increase in linux so it does not hurt on other systems.
+            with_named_thread="-lpthread"
+          else
+            AC_MSG_RESULT("Not found")
+            # If this is a linux machine we should barf
+            AC_MSG_ERROR([This is a Linux system without a working getconf, 
+and Linuxthreads was not found. Please install it (or a new glibc) and try again.  
+See the Installation chapter in the Reference Manual for more information.])
           fi
-	fi
-     fi
-   fi
-fi
+        else
+            AC_MSG_RESULT("no need to check headers")
+        fi
+        
+        AC_MSG_CHECKING("for pthread_create in -lpthread");
+        ac_save_LIBS="$LIBS"
+        LIBS="$LIBS -lpthread"
+        AC_TRY_LINK( [#include <pthread.h>],
+              [ (void) pthread_create((pthread_t*) 0,(pthread_attr_t*) 0, 0, 0); ],
+              AC_MSG_RESULT("yes"),
+              [ AC_MSG_RESULT("no")
+                AC_MSG_ERROR([
+This is a Linux system claiming to support threads, either Linuxthreads or NPTL, but linking a test program failed.  
+Please install one of these (or a new glibc) and try again.  
+See the Installation chapter in the Reference Manual for more information.]) ]
+              )
+        LIBS="$ac_save_LIBS"
+    else
+        AC_MSG_RESULT("no")
+    fi  # "$TARGET_LINUX" 
+fi  # "$with_named_thread" = "no" -a "$with_mit_threads" = "no"
+
+
+# Hack for DEC-UNIX (OSF1 -> Tru64)
+if test "$with_named_thread" = "no" -a "$with_mit_threads" = "no"
+then
+    AC_MSG_CHECKING("DEC threads post OSF/1 3.2")
+    if test -f /usr/shlib/libpthread.so -a -f /usr/lib/libmach.a -a -f /usr/ccs/lib/cmplrs/cc/libexc.a
+    then
+      with_named_thread="-lpthread -lmach -lexc"
+      CFLAGS="$CFLAGS -D_REENTRANT"
+      CXXFLAGS="$CXXFLAGS -D_REENTRANT"
+      AC_DEFINE(HAVE_DEC_THREADS, [1], [Whether we are using DEC threads])
+      AC_MSG_RESULT("yes")
+    else
+      AC_MSG_RESULT("no")
+    fi  # DEC threads
+fi  # "$with_named_thread" = "no" -a "$with_mit_threads" = "no"
 
 
 dnl This is needed because -lsocket has to come after the thread
@@ -1738,7 +1771,7 @@ fi
 AC_SUBST(COMPILATION_COMMENT)
 
 AC_MSG_CHECKING("need of special linking flags")
-if test "$IS_LINUX" = "true" -a "$ac_cv_prog_gcc" = "yes" -a "$all_is_static" != "yes"
+if test "$TARGET_LINUX" = "true" -a "$ac_cv_prog_gcc" = "yes" -a "$all_is_static" != "yes"
 then
   LDFLAGS="$LDFLAGS -rdynamic"
   AC_MSG_RESULT("-rdynamic")
@@ -1957,7 +1990,7 @@ CFLAGS="$ORG_CFLAGS"
 # Sanity check: We chould not have any fseeko symbol unless
 # large_file_support=yes
 AC_CHECK_FUNC(fseeko,
-[if test "$large_file_support" = no -a "$IS_LINUX" = "true";
+[if test "$large_file_support" = no -a "$TARGET_LINUX" = "true";
 then
   AC_MSG_ERROR("Found fseeko symbol but large_file_support is not enabled!");
 fi]
diff --git a/include/my_global.h b/include/my_global.h
index 23cf0d54824..745179e8a06 100644
--- a/include/my_global.h
+++ b/include/my_global.h
@@ -97,7 +97,7 @@
 
 
 /* Fix problem with S_ISLNK() on Linux */
-#if defined(HAVE_LINUXTHREADS)
+#if defined(TARGET_OS_LINUX)
 #undef  _GNU_SOURCE
 #define _GNU_SOURCE 1
 #endif
@@ -107,6 +107,7 @@
 #undef THREAD
 #undef HAVE_mit_thread
 #undef HAVE_LINUXTHREADS
+#undef HAVE_NPTL
 #undef HAVE_UNIXWARE7_THREADS
 #endif
 
@@ -214,13 +215,13 @@ C_MODE_START int __cxa_pure_virtual() {\
 #endif
 
 /* In Linux-alpha we have atomic.h if we are using gcc */
-#if defined(HAVE_LINUXTHREADS) && defined(__GNUC__) && defined(__alpha__) && (__GNUC__ > 2 || ( __GNUC__ == 2 &&  __GNUC_MINOR__ >= 95)) && !defined(HAVE_ATOMIC_ADD)
+#if defined(TARGET_OS_LINUX) && defined(__GNUC__) && defined(__alpha__) && (__GNUC__ > 2 || ( __GNUC__ == 2 &&  __GNUC_MINOR__ >= 95)) && !defined(HAVE_ATOMIC_ADD)
 #define HAVE_ATOMIC_ADD
 #define HAVE_ATOMIC_SUB
 #endif
 
 /* In Linux-ia64 including atomic.h will give us an error */
-#if (defined(HAVE_LINUXTHREADS) && defined(__GNUC__) && (defined(__ia64__)||defined(__powerpc64__))) || !defined(THREAD)
+#if (defined(TARGET_OS_LINUX) && defined(__GNUC__) && (defined(__ia64__)||defined(__powerpc64__))) || !defined(THREAD)
 #undef HAVE_ATOMIC_ADD
 #undef HAVE_ATOMIC_SUB
 #endif
@@ -755,7 +756,7 @@ typedef unsigned long	uint32; /* Short for unsigned integer >= 32 bits */
 error "Neither int or long is of 4 bytes width"
 #endif
 
-#if !defined(HAVE_ULONG) && !defined(HAVE_LINUXTHREADS) && !defined(__USE_MISC)
+#if !defined(HAVE_ULONG) && !defined(TARGET_OS_LINUX) && !defined(__USE_MISC)
 typedef unsigned long	ulong;		  /* Short for unsigned long */
 #endif
 #ifndef longlong_defined
diff --git a/myisam/Makefile.am b/myisam/Makefile.am
index 378e8107814..0b8a25e3404 100644
--- a/myisam/Makefile.am
+++ b/myisam/Makefile.am
@@ -88,7 +88,7 @@ SUFFIXES = .sh
 	  -e 's!@''FIND_PROC''@!@FIND_PROC@!' \
 	  -e 's!@''MYSQLD_DEFAULT_SWITCHES''@!@MYSQLD_DEFAULT_SWITCHES@!' \
 	  -e 's!@''MYSQL_UNIX_ADDR''@!@MYSQL_UNIX_ADDR@!' \
-	  -e 's!@''IS_LINUX''@!@IS_LINUX@!' \
+	  -e 's!@''TARGET_LINUX''@!@TARGET_LINUX@!' \
 	  -e "s!@""CONF_COMMAND""@!@CONF_COMMAND@!" \
 	  -e 's!@''MYSQLD_USER''@!@MYSQLD_USER@!' \
 	  -e 's!@''sysconfdir''@!@sysconfdir@!' \
diff --git a/mysql-test/r/func_math.result b/mysql-test/r/func_math.result
index 3a28cccfac5..9cb1e4a56d6 100644
--- a/mysql-test/r/func_math.result
+++ b/mysql-test/r/func_math.result
@@ -1,3 +1,4 @@
+drop table if exists t1;
 select floor(5.5),floor(-5.5);
 floor(5.5)	floor(-5.5)
 5	-6
@@ -126,3 +127,13 @@ Warnings:
 Note	1003	select degrees(pi()) AS `degrees(pi())`,radians(360) AS `radians(360)`
 select rand(rand);
 ERROR 42S22: Unknown column 'rand' in 'field list'
+create table t1 select round(1, 6);
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `round(1, 6)` double(7,6) NOT NULL default '0.000000'
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+select * from t1;
+round(1, 6)
+1.000000
+drop table t1;
diff --git a/mysql-test/t/func_math.test b/mysql-test/t/func_math.test
index 668aefc2d8d..4c24dae8c5d 100644
--- a/mysql-test/t/func_math.test
+++ b/mysql-test/t/func_math.test
@@ -2,6 +2,10 @@
 # Test of math functions
 #
 
+--disable_warnings                                                              
+drop table if exists t1;                                                        
+--enable_warnings                                                               
+
 select floor(5.5),floor(-5.5);
 explain extended select floor(5.5),floor(-5.5);
 select ceiling(5.5),ceiling(-5.5);
@@ -58,3 +62,12 @@ explain extended select degrees(pi()),radians(360);
 
 --error 1054
 select rand(rand);
+
+#
+# Bug #9837: problem with round()
+#
+
+create table t1 select round(1, 6);
+show create table t1;
+select * from t1;
+drop table t1;
diff --git a/mysys/thr_mutex.c b/mysys/thr_mutex.c
index bbcfaa8bba6..2facb4e18cf 100644
--- a/mysys/thr_mutex.c
+++ b/mysys/thr_mutex.c
@@ -17,7 +17,7 @@
 /* This makes a wrapper for mutex handling to make it easier to debug mutex */
 
 #include <my_global.h>
-#if defined(HAVE_LINUXTHREADS) && !defined (__USE_UNIX98)
+#if defined(TARGET_OS_LINUX) && !defined (__USE_UNIX98)
 #define __USE_UNIX98			/* To get rw locks under Linux */
 #endif
 #if defined(THREAD) && defined(SAFE_MUTEX)
diff --git a/scripts/Makefile.am b/scripts/Makefile.am
index b170fa483b2..e2ef1bba97c 100644
--- a/scripts/Makefile.am
+++ b/scripts/Makefile.am
@@ -135,7 +135,7 @@ SUFFIXES = .sh
 	  -e 's!@''MYSQLD_DEFAULT_SWITCHES''@!@MYSQLD_DEFAULT_SWITCHES@!' \
 	  -e 's!@''MYSQL_UNIX_ADDR''@!@MYSQL_UNIX_ADDR@!' \
 	  -e 's!@''MYSQL_TCP_PORT''@!@MYSQL_TCP_PORT@!' \
-	  -e 's!@''IS_LINUX''@!@IS_LINUX@!' \
+	  -e 's!@''TARGET_LINUX''@!@TARGET_LINUX@!' \
 	  -e "s!@""CONF_COMMAND""@!@CONF_COMMAND@!" \
 	  -e 's!@''MYSQLD_USER''@!@MYSQLD_USER@!' \
 	  -e 's!@''STATIC_NSS_FLAGS''@!@STATIC_NSS_FLAGS@!' \
diff --git a/scripts/mysqld_safe.sh b/scripts/mysqld_safe.sh
index 308db270828..8a232f4f7f9 100644
--- a/scripts/mysqld_safe.sh
+++ b/scripts/mysqld_safe.sh
@@ -324,7 +324,7 @@ do
     break
   fi
 
-  if @IS_LINUX@ && test $KILL_MYSQLD -eq 1
+  if @TARGET_LINUX@ && test $KILL_MYSQLD -eq 1
   then
     # Test if one process was hanging.
     # This is only a fix for Linux (running as base 3 mysqld processes)
diff --git a/sql/item_func.cc b/sql/item_func.cc
index eb6e395c266..2b38584fe23 100644
--- a/sql/item_func.cc
+++ b/sql/item_func.cc
@@ -1072,6 +1072,8 @@ void Item_func_round::fix_length_and_dec()
       decimals=0;
     else
       decimals=min(tmp,NOT_FIXED_DEC);
+    if ((tmp= decimals - args[0]->decimals) > 0)
+      max_length+= tmp;
   }
 }
 
diff --git a/sql/lock.cc b/sql/lock.cc
index 8f1cd080db7..03541bb0810 100644
--- a/sql/lock.cc
+++ b/sql/lock.cc
@@ -82,7 +82,8 @@ static int unlock_external(THD *thd, TABLE **table,uint count);
 static void print_lock_error(int error);
 
 
-MYSQL_LOCK *mysql_lock_tables(THD *thd,TABLE **tables,uint count)
+MYSQL_LOCK *mysql_lock_tables(THD *thd, TABLE **tables, uint count,
+                              bool ignore_global_read_lock)
 {
   MYSQL_LOCK *sql_lock;
   TABLE *write_lock_used;
@@ -93,7 +94,7 @@ MYSQL_LOCK *mysql_lock_tables(THD *thd,TABLE **tables,uint count)
     if (!(sql_lock = get_lock_data(thd,tables,count, 0,&write_lock_used)))
       break;
 
-    if (global_read_lock && write_lock_used)
+    if (global_read_lock && write_lock_used && ! ignore_global_read_lock)
     {
       /*
 	Someone has issued LOCK ALL TABLES FOR READ and we want a write lock
@@ -911,3 +912,49 @@ void make_global_read_lock_block_commit(THD *thd)
   pthread_mutex_unlock(&LOCK_open);
   thd->global_read_lock= MADE_GLOBAL_READ_LOCK_BLOCK_COMMIT;
 }
+
+
+/*
+  Set protection against global read lock.
+
+  SYNOPSIS
+    set_protect_against_global_read_lock()
+    void
+
+  RETURN
+    FALSE       OK, no global read lock exists.
+    TRUE        Error, global read lock exists already.
+*/
+
+my_bool set_protect_against_global_read_lock(void)
+{
+  my_bool       global_read_lock_exists;
+
+  pthread_mutex_lock(&LOCK_open);
+  if (! (global_read_lock_exists= test(global_read_lock)))
+    protect_against_global_read_lock++;
+  pthread_mutex_unlock(&LOCK_open);
+  return global_read_lock_exists;
+}
+
+
+/*
+  Unset protection against global read lock.
+
+  SYNOPSIS
+    unset_protect_against_global_read_lock()
+    void
+
+  RETURN
+    void
+*/
+
+void unset_protect_against_global_read_lock(void)
+{
+  pthread_mutex_lock(&LOCK_open);
+  protect_against_global_read_lock--;
+  pthread_mutex_unlock(&LOCK_open);
+  pthread_cond_broadcast(&COND_refresh);
+}
+
+
diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h
index e75a6f25957..f5d4464ce68 100644
--- a/sql/mysql_priv.h
+++ b/sql/mysql_priv.h
@@ -975,7 +975,8 @@ extern pthread_t signal_thread;
 extern struct st_VioSSLAcceptorFd * ssl_acceptor_fd;
 #endif /* HAVE_OPENSSL */
 
-MYSQL_LOCK *mysql_lock_tables(THD *thd,TABLE **table,uint count);
+MYSQL_LOCK *mysql_lock_tables(THD *thd, TABLE **table, uint count,
+                              bool ignore_global_read_lock= FALSE);
 void mysql_unlock_tables(THD *thd, MYSQL_LOCK *sql_lock);
 void mysql_unlock_read_tables(THD *thd, MYSQL_LOCK *sql_lock);
 void mysql_unlock_some_tables(THD *thd, TABLE **table,uint count);
@@ -988,6 +989,8 @@ void unlock_global_read_lock(THD *thd);
 bool wait_if_global_read_lock(THD *thd, bool abort_on_refresh, bool is_not_commit);
 void start_waiting_global_read_lock(THD *thd);
 void make_global_read_lock_block_commit(THD *thd);
+my_bool set_protect_against_global_read_lock(void);
+void unset_protect_against_global_read_lock(void);
 
 /* Lock based on name */
 int lock_and_wait_for_table_name(THD *thd, TABLE_LIST *table_list);
diff --git a/sql/sql_insert.cc b/sql/sql_insert.cc
index 7f890a583c6..31393b2173a 100644
--- a/sql/sql_insert.cc
+++ b/sql/sql_insert.cc
@@ -851,27 +851,42 @@ static TABLE *delayed_get_table(THD *thd,TABLE_LIST *table_list)
 {
   int error;
   delayed_insert *tmp;
+  TABLE *table;
   DBUG_ENTER("delayed_get_table");
 
   if (!table_list->db)
     table_list->db=thd->db;
 
-  /* no match; create a new thread to handle the table */
+  /* Find the thread which handles this table. */
   if (!(tmp=find_handler(thd,table_list)))
   {
-    /* Don't create more than max_insert_delayed_threads */
+    /*
+      No match. Create a new thread to handle the table, but
+      no more than max_insert_delayed_threads.
+    */
     if (delayed_insert_threads >= thd->variables.max_insert_delayed_threads)
       DBUG_RETURN(0);
     thd->proc_info="Creating delayed handler";
     pthread_mutex_lock(&LOCK_delayed_create);
-    if (!(tmp=find_handler(thd,table_list)))	// Was just created
+    /*
+      The first search above was done without LOCK_delayed_create.
+      Another thread might have created the handler in between. Search again.
+    */
+    if (! (tmp= find_handler(thd, table_list)))
     {
+      /*
+        Avoid that a global read lock steps in while we are creating the
+        new thread. It would block trying to open the table. Hence, the
+        DI thread and this thread would wait until after the global
+        readlock is gone. If the read lock exists already, we leave with
+        no table and then switch to non-delayed insert.
+      */
+      if (set_protect_against_global_read_lock())
+        goto err;
       if (!(tmp=new delayed_insert()))
       {
-	thd->fatal_error();
 	my_error(ER_OUTOFMEMORY,MYF(0),sizeof(delayed_insert));
-	pthread_mutex_unlock(&LOCK_delayed_create);
-	DBUG_RETURN(0);
+	goto err1;
       }
       pthread_mutex_lock(&LOCK_thread_count);
       thread_count++;
@@ -880,10 +895,8 @@ static TABLE *delayed_get_table(THD *thd,TABLE_LIST *table_list)
 	  !(tmp->thd.query=my_strdup(table_list->real_name,MYF(MY_WME))))
       {
 	delete tmp;
-	thd->fatal_error();
 	my_error(ER_OUT_OF_RESOURCES,MYF(0));
-	pthread_mutex_unlock(&LOCK_delayed_create);
-	DBUG_RETURN(0);
+	goto err1;
       }
       tmp->table_list= *table_list;			// Needed to open table
       tmp->table_list.db= tmp->thd.db;
@@ -899,10 +912,8 @@ static TABLE *delayed_get_table(THD *thd,TABLE_LIST *table_list)
 	pthread_mutex_unlock(&tmp->mutex);
 	tmp->unlock();
 	delete tmp;
-	thd->fatal_error();
-	pthread_mutex_unlock(&LOCK_delayed_create);
 	net_printf(thd,ER_CANT_CREATE_THREAD,error);
-	DBUG_RETURN(0);
+	goto err1;
       }
 
       /* Wait until table is open */
@@ -912,6 +923,7 @@ static TABLE *delayed_get_table(THD *thd,TABLE_LIST *table_list)
 	pthread_cond_wait(&tmp->cond_client,&tmp->mutex);
       }
       pthread_mutex_unlock(&tmp->mutex);
+      unset_protect_against_global_read_lock();
       thd->proc_info="got old table";
       if (tmp->thd.killed)
       {
@@ -923,28 +935,34 @@ static TABLE *delayed_get_table(THD *thd,TABLE_LIST *table_list)
 	  thd->net.last_errno=tmp->thd.net.last_errno;
 	}
 	tmp->unlock();
-	pthread_mutex_unlock(&LOCK_delayed_create);
-	DBUG_RETURN(0);				// Continue with normal insert
+	goto err;
       }
       if (thd->killed)
       {
 	tmp->unlock();
-	pthread_mutex_unlock(&LOCK_delayed_create);
-	DBUG_RETURN(0);
+	goto err;
       }
     }
     pthread_mutex_unlock(&LOCK_delayed_create);
   }
 
   pthread_mutex_lock(&tmp->mutex);
-  TABLE *table=tmp->get_local_table(thd);
+  table=tmp->get_local_table(thd);
   pthread_mutex_unlock(&tmp->mutex);
-  tmp->unlock();
   if (table)
     thd->di=tmp;
   else if (tmp->thd.is_fatal_error)
     thd->fatal_error();
+  /* Unlock the delayed insert object after its last access. */
+  tmp->unlock();
   DBUG_RETURN((table_list->table=table));
+
+ err1:
+  thd->fatal_error();
+  unset_protect_against_global_read_lock();
+ err:
+  pthread_mutex_unlock(&LOCK_delayed_create);
+  DBUG_RETURN(0); // Continue with normal insert
 }
 
 
@@ -1165,6 +1183,14 @@ extern "C" pthread_handler_decl(handle_delayed_insert,arg)
   thd->killed=abort_loop;
   pthread_mutex_unlock(&LOCK_thread_count);
 
+  /*
+    Wait until the client runs into pthread_cond_wait(),
+    where we free it after the table is opened and di linked in the list.
+    If we did not wait here, the client might detect the opened table
+    before it is linked to the list. It would release LOCK_delayed_create
+    and allow another thread to create another handler for the same table,
+    since it does not find one in the list.
+  */
   pthread_mutex_lock(&di->mutex);
 #if !defined( __WIN__) && !defined(OS2)	/* Win32 calls this in pthread_create */
   if (my_thread_init())
@@ -1279,8 +1305,17 @@ extern "C" pthread_handler_decl(handle_delayed_insert,arg)
 
     if (di->tables_in_use && ! thd->lock)
     {
-      /* request for new delayed insert */
-      if (!(thd->lock=mysql_lock_tables(thd,&di->table,1)))
+      /*
+        Request for new delayed insert.
+        Lock the table, but avoid to be blocked by a global read lock.
+        If we got here while a global read lock exists, then one or more
+        inserts started before the lock was requested. These are allowed
+        to complete their work before the server returns control to the
+        client which requested the global read lock. The delayed insert
+        handler will close the table and finish when the outstanding
+        inserts are done.
+      */
+      if (! (thd->lock= mysql_lock_tables(thd, &di->table, 1, TRUE)))
       {
 	di->dead= 1;			// Some fatal error
         thd->killed= 1;
diff --git a/sql/stacktrace.c b/sql/stacktrace.c
index 322d647e741..838f547dc02 100644
--- a/sql/stacktrace.c
+++ b/sql/stacktrace.c
@@ -43,7 +43,7 @@ void safe_print_str(const char* name, const char* val, int max_len)
   fputc('\n', stderr);
 }
 
-#ifdef HAVE_LINUXTHREADS
+#ifdef TARGET_OS_LINUX
 #define SIGRETURN_FRAME_COUNT  2
 
 #if defined(__alpha__) && defined(__GNUC__)
@@ -201,7 +201,7 @@ end:
 stack trace is much more helpful in diagnosing the problem, so please do \n\
 resolve it\n");
 }
-#endif /* HAVE_LINUXTHREADS */
+#endif /* TARGET_OS_LINUX */
 #endif /* HAVE_STACKTRACE */
 
 /* Produce a core for the thread */
diff --git a/sql/stacktrace.h b/sql/stacktrace.h
index 980e1ea07eb..d5d1e05ef0e 100644
--- a/sql/stacktrace.h
+++ b/sql/stacktrace.h
@@ -18,7 +18,7 @@
 extern "C" {
 #endif
 
-#ifdef HAVE_LINUXTHREADS
+#ifdef TARGET_OS_LINUX
 #if defined(HAVE_STACKTRACE) || (defined (__i386__) || (defined(__alpha__) && defined(__GNUC__)))
 #undef HAVE_STACKTRACE
 #define HAVE_STACKTRACE
@@ -30,7 +30,7 @@ extern char* heap_start;
 void print_stacktrace(gptr stack_bottom, ulong thread_stack);
 void safe_print_str(const char* name, const char* val, int max_len);
 #endif /* (defined (__i386__) || (defined(__alpha__) && defined(__GNUC__))) */
-#endif /* HAVE_LINUXTHREADS */
+#endif /* TARGET_OS_LINUX */
 
 /* Define empty prototypes for functions that are not implemented */
 #ifndef HAVE_STACKTRACE
diff --git a/support-files/Makefile.am b/support-files/Makefile.am
index 0a6077f0efc..5f5a10fc1fc 100644
--- a/support-files/Makefile.am
+++ b/support-files/Makefile.am
@@ -90,7 +90,7 @@ SUFFIXES = .sh
 	  -e 's!@''FIND_PROC''@!@FIND_PROC@!' \
 	  -e 's!@''MYSQLD_DEFAULT_SWITCHES''@!@MYSQLD_DEFAULT_SWITCHES@!' \
 	  -e 's!@''MYSQL_UNIX_ADDR''@!@MYSQL_UNIX_ADDR@!' \
-	  -e 's!@''IS_LINUX''@!@IS_LINUX@!' \
+	  -e 's!@''TARGET_LINUX''@!@TARGET_LINUX@!' \
 	  -e "s!@""CONF_COMMAND""@!@CONF_COMMAND@!" \
 	  -e 's!@''MYSQLD_USER''@!@MYSQLD_USER@!' \
 	  -e 's!@''sysconfdir''@!@sysconfdir@!' \
diff --git a/tools/mysqlmanager.c b/tools/mysqlmanager.c
index bb0a76d6c49..27caa1e0255 100644
--- a/tools/mysqlmanager.c
+++ b/tools/mysqlmanager.c
@@ -101,7 +101,7 @@ static CHARSET_INFO *cs= &my_charset_latin1;
   set by the user
 */
 
-#if defined(__i386__) && defined(HAVE_LINUXTHREADS)
+#if defined(__i386__) && defined(TARGET_OS_LINUX)
 #define DO_STACKTRACE 1
 #endif