Update.

2003-06-17  Jakub Jelinek  <jakub@redhat.com>

	* posix/regcomp.c (build_word_op): Use alnum instead of alpha class.

16 files changed, 155 insertions, 31 deletions

diff --git a/linuxthreads/ChangeLog b/linuxthreads/ChangeLog
index 71f4ffc..09422c0 100644
--- a/linuxthreads/ChangeLog
+++ b/linuxthreads/ChangeLog
@@ -1,3 +1,28 @@
+2003-06-18  Jakub Jelinek  <jakub@redhat.com>
+
+	* internals.h (__librt_multiple_threads, __librt_enable_asynccancel,
+	__librt_disable_asynccancel): Declare.
+	(LIBC_CANCEL_ASYNC, LIBC_CANCEL_RESET, LIBC_CANCEL_HANDLED): Define
+	for IS_IN_librt.
+	* sysdeps/unix/sysv/linux/i386/sysdep-cancel.h: Support cancellation
+	in librt.
+	* sysdeps/unix/sysv/linux/ia64/sysdep-cancel.h: Likewise.
+	* sysdeps/unix/sysv/linux/s390/s390-32/sysdep-cancel.h: Likewise.
+	* sysdeps/unix/sysv/linux/s390/s390-64/sysdep-cancel.h: Likewise.
+	* sysdeps/unix/sysv/linux/sparc/sparc32/sysdep-cancel.h: Likewise.
+	* sysdeps/unix/sysv/linux/sparc/sparc64/sysdep-cancel.h: Likewise.
+	* sysdeps/unix/sysv/linux/x86_64/sysdep-cancel.h: Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep-cancel.h: Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep-cancel.h: Likewise.
+	* sysdeps/x86_64/tcb-offsets.sym: New file.
+	* sysdeps/x86_64/Makefile: New file.
+	* sysdeps/x86_64/tls.h (tcbhead_t): Add multiple_threads.
+	* Versions (libc): Export __librt_enable_asynccancel,
+	__librt_disable_asynccancel and __librt_multiple_threads as
+	GLIBC_PRIVATE.
+	* libc-cancellation.c (__librt_multiple_threads,
+	__librt_enable_asynccancel, __librt_disable_asynccancel): New aliases.
+
 2003-06-12  Steven Munroe  <sjmunroe@us.ibm.com>
 
 	* sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep-cancel.h
diff --git a/linuxthreads/Versions b/linuxthreads/Versions
index 88668e6..e10826c 100644
--- a/linuxthreads/Versions
+++ b/linuxthreads/Versions
@@ -31,7 +31,8 @@ libc {
 
     __libc_creat; __libc_poll; __libc_pselect; __libc_select;
     __libc_sigpause; __libc_sigsuspend; __libc_sigwait; __libc_sigwaitinfo;
-    __libc_waitid; __libc___xpg_sigpause;
+    __libc_waitid; __libc___xpg_sigpause; __librt_enable_asynccancel;
+    __librt_disable_asynccancel; __librt_multiple_threads;
   }
 }
 
diff --git a/linuxthreads/internals.h b/linuxthreads/internals.h
index d3b8bbe..69923e9 100644
--- a/linuxthreads/internals.h
+++ b/linuxthreads/internals.h
@@ -257,6 +257,7 @@ static inline int nonexisting_handle(pthread_handle h, pthread_t id)
 
 /* Defined and used in libc.so.  */
 extern int __libc_multiple_threads attribute_hidden;
+extern int __librt_multiple_threads;
 
 /* Debugging */
 
@@ -468,6 +469,10 @@ extern int __libc_enable_asynccancel (void) attribute_hidden;
 extern void __libc_disable_asynccancel (int oldtype)
   internal_function attribute_hidden;
 
+/* The two functions are in libc.so and are exported.  */
+extern int __librt_enable_asynccancel (void);
+extern void __librt_disable_asynccancel (int oldtype) internal_function;
+
 extern void __pthread_cleanup_upto (__jmp_buf target,
 				    char *targetframe) attribute_hidden;
 extern pid_t __pthread_fork (struct fork_block *b) attribute_hidden;
@@ -480,7 +485,7 @@ extern pid_t __pthread_fork (struct fork_block *b) attribute_hidden;
 # define LIBC_CANCEL_HANDLED() \
   __asm (".globl " __SYMBOL_PREFIX "__libc_enable_asynccancel"); \
   __asm (".globl " __SYMBOL_PREFIX "__libc_disable_asynccancel")
-#elif defined NOT_IN_libc && defined IS_IN_libpthread
+#elif defined IS_IN_libpthread
 # define LIBC_CANCEL_ASYNC() \
   __pthread_enable_asynccancel ()
 # define LIBC_CANCEL_RESET(oldtype) \
@@ -488,6 +493,14 @@ extern pid_t __pthread_fork (struct fork_block *b) attribute_hidden;
 # define LIBC_CANCEL_HANDLED() \
   __asm (".globl " __SYMBOL_PREFIX "__pthread_enable_asynccancel"); \
   __asm (".globl " __SYMBOL_PREFIX "__pthread_disable_asynccancel")
+#elif defined IS_IN_librt
+# define LIBC_CANCEL_ASYNC() \
+  __librt_enable_asynccancel ()
+# define LIBC_CANCEL_RESET(oldtype) \
+  __librt_disable_asynccancel (oldtype)
+# define LIBC_CANCEL_HANDLED() \
+  __asm (".globl " __SYMBOL_PREFIX "__librt_enable_asynccancel"); \
+  __asm (".globl " __SYMBOL_PREFIX "__librt_disable_asynccancel")
 #else
 # define LIBC_CANCEL_ASYNC()    0 /* Just a dummy value.  */
 # define LIBC_CANCEL_RESET(val) ((void)(val)) /* Nothing, but evaluate it.  */
diff --git a/linuxthreads/libc-cancellation.c b/linuxthreads/libc-cancellation.c
index b301d91..c28920f 100644
--- a/linuxthreads/libc-cancellation.c
+++ b/linuxthreads/libc-cancellation.c
@@ -31,7 +31,8 @@
 weak_extern (__pthread_do_exit)
 # endif
 
-int __libc_multiple_threads attribute_hidden;
+int __libc_multiple_threads attribute_hidden __attribute__((nocommon));
+strong_alias (__libc_multiple_threads, __librt_multiple_threads);
 
 /* The next two functions are similar to pthread_setcanceltype() but
    more specialized for the use in the cancelable functions like write().
@@ -49,6 +50,7 @@ __libc_enable_asynccancel (void)
 			(PTHREAD_CANCELED, CURRENT_STACK_FRAME), 0);
   return oldtype;
 }
+strong_alias (__libc_enable_asynccancel, __librt_enable_asynccancel)
 
 void
 internal_function attribute_hidden
@@ -57,5 +59,6 @@ __libc_disable_asynccancel (int oldtype)
   pthread_descr self = thread_self();
   LIBC_THREAD_SETMEM(self, p_canceltype, oldtype);
 }
+strong_alias (__libc_disable_asynccancel, __librt_disable_asynccancel)
 
 #endif
diff --git a/linuxthreads/sysdeps/unix/sysv/linux/i386/sysdep-cancel.h b/linuxthreads/sysdeps/unix/sysv/linux/i386/sysdep-cancel.h
index 3fdec5d..e84c98d8 100644
--- a/linuxthreads/sysdeps/unix/sysv/linux/i386/sysdep-cancel.h
+++ b/linuxthreads/sysdeps/unix/sysv/linux/i386/sysdep-cancel.h
@@ -24,7 +24,7 @@
 # include <linuxthreads/internals.h>
 #endif
 
-#if !defined NOT_IN_libc || defined IS_IN_libpthread
+#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
 
 # undef PSEUDO
 # define PSEUDO(name, syscall_name, args)				      \
@@ -108,8 +108,10 @@
 
 #if !defined NOT_IN_libc
 # define __local_multiple_threads __libc_multiple_threads
-#else
+#elif defined IS_IN_libpthread
 # define __local_multiple_threads __pthread_multiple_threads
+#else
+# define __local_multiple_threads __librt_multiple_threads
 #endif
 
 # ifndef __ASSEMBLER__
@@ -118,7 +120,12 @@
   __builtin_expect (THREAD_GETMEM (THREAD_SELF,				      \
 				   p_header.data.multiple_threads) == 0, 1)
 #  else
-extern int __local_multiple_threads attribute_hidden;
+extern int __local_multiple_threads
+#   if !defined NOT_IN_libc || defined IS_IN_libpthread
+  attribute_hidden;
+#   else
+  ;
+#   endif
 #   define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
 #  endif
 # else
@@ -127,16 +134,23 @@ extern int __local_multiple_threads attribute_hidden;
 #  elif defined FLOATING_STACKS && USE___THREAD
 #   define SINGLE_THREAD_P cmpl $0, %gs:MULTIPLE_THREADS_OFFSET
 #  else
+#   if !defined NOT_IN_libc || defined IS_IN_libpthread
+#    define __SINGLE_THREAD_CMP cmpl $0, __local_multiple_threads@GOTOFF(%ecx)
+#   else
+#    define __SINGLE_THREAD_CMP \
+  movl __local_multiple_threads@GOT(%ecx), %ecx;\
+  cmpl $0, (%ecx)
+#   endif
 #   if !defined HAVE_HIDDEN || !USE___THREAD
 #    define SINGLE_THREAD_P \
   SETUP_PIC_REG (cx);				\
   addl $_GLOBAL_OFFSET_TABLE_, %ecx;		\
-  cmpl $0, __local_multiple_threads@GOTOFF(%ecx)
+  __SINGLE_THREAD_CMP
 #   else
 #    define SINGLE_THREAD_P \
   call __i686.get_pc_thunk.cx;			\
   addl $_GLOBAL_OFFSET_TABLE_, %ecx;		\
-  cmpl $0, __local_multiple_threads@GOTOFF(%ecx)
+  __SINGLE_THREAD_CMP
 #   endif
 #  endif
 # endif
diff --git a/linuxthreads/sysdeps/unix/sysv/linux/ia64/sysdep-cancel.h b/linuxthreads/sysdeps/unix/sysv/linux/ia64/sysdep-cancel.h
index af45b19..2545c9f 100644
--- a/linuxthreads/sysdeps/unix/sysv/linux/ia64/sysdep-cancel.h
+++ b/linuxthreads/sysdeps/unix/sysv/linux/ia64/sysdep-cancel.h
@@ -23,7 +23,7 @@
 # include <linuxthreads/internals.h>
 #endif
 
-#if !defined NOT_IN_libc || defined IS_IN_libpthread
+#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
 
 # undef PSEUDO
 # define PSEUDO(name, syscall_name, args)				      \
@@ -85,9 +85,12 @@ __syscall_error_##args:							      \
 # ifdef IS_IN_libpthread
 #  define CENABLE	br.call.sptk.many b0 = __pthread_enable_asynccancel
 #  define CDISABLE	br.call.sptk.many b0 = __pthread_disable_asynccancel
-# else
+# elif !defined NOT_IN_libc
 #  define CENABLE	br.call.sptk.many b0 = __libc_enable_asynccancel
 #  define CDISABLE	br.call.sptk.many b0 = __libc_disable_asynccancel
+# else
+#  define CENABLE	br.call.sptk.many b0 = __librt_enable_asynccancel
+#  define CDISABLE	br.call.sptk.many b0 = __librt_disable_asynccancel
 # endif
 
 #define COPY_ARGS_0	/* Nothing */
diff --git a/linuxthreads/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep-cancel.h b/linuxthreads/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep-cancel.h
index 2d191d1..b5d0665 100644
--- a/linuxthreads/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep-cancel.h
+++ b/linuxthreads/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep-cancel.h
@@ -23,7 +23,7 @@
 # include <linuxthreads/internals.h>
 #endif
 
-#if !defined NOT_IN_libc || defined IS_IN_libpthread
+#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
 
 # undef PSEUDO
 # define PSEUDO(name, syscall_name, args)				\
@@ -78,9 +78,12 @@
 # ifdef IS_IN_libpthread
 #  define CENABLE	bl JUMPTARGET(__pthread_enable_asynccancel)
 #  define CDISABLE	bl JUMPTARGET(__pthread_disable_asynccancel)
-# else
+# elif !defined NOT_IN_libc
 #  define CENABLE	bl JUMPTARGET(__libc_enable_asynccancel)
 #  define CDISABLE	bl JUMPTARGET(__libc_disable_asynccancel)
+# else
+#  define CENABLE	bl JUMPTARGET(__librt_enable_asynccancel)
+#  define CDISABLE	bl JUMPTARGET(__librt_disable_asynccancel)
 # endif
 
 # ifndef __ASSEMBLER__
diff --git a/linuxthreads/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep-cancel.h b/linuxthreads/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep-cancel.h
index 2745c02..17fde9d 100644
--- a/linuxthreads/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep-cancel.h
+++ b/linuxthreads/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep-cancel.h
@@ -22,7 +22,7 @@
 # include <linuxthreads/internals.h>
 #endif
 
-#if !defined NOT_IN_libc || defined IS_IN_libpthread
+#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
 
 # undef PSEUDO
 # define PSEUDO(name, syscall_name, args)				\
@@ -78,14 +78,23 @@
 #  define CENABLE	bl JUMPTARGET(__pthread_enable_asynccancel)
 #  define CDISABLE	bl JUMPTARGET(__pthread_disable_asynccancel)
 #  define __local_multiple_threads __pthread_multiple_threads
-# else
+# elif !defined NOT_IN_libc
 #  define CENABLE	bl JUMPTARGET(__libc_enable_asynccancel)
 #  define CDISABLE	bl JUMPTARGET(__libc_disable_asynccancel)
 #  define __local_multiple_threads __libc_multiple_threads
+# else
+#  define CENABLE	bl JUMPTARGET(__librt_enable_asynccancel); nop
+#  define CDISABLE	bl JUMPTARGET(__librt_disable_asynccancel); nop
+#  define __local_multiple_threads __librt_multiple_threads
 # endif
 
 # ifndef __ASSEMBLER__
-extern int __local_multiple_threads attribute_hidden;
+extern int __local_multiple_threads
+#  if !defined NOT_IN_libc || defined IS_IN_libpthread
+  attribute_hidden;
+#  else
+  ;
+#  endif
 #  define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
 # else
 #   define SINGLE_THREAD_P						\
diff --git a/linuxthreads/sysdeps/unix/sysv/linux/s390/s390-32/sysdep-cancel.h b/linuxthreads/sysdeps/unix/sysv/linux/s390/s390-32/sysdep-cancel.h
index 723f78c..fb9348b 100644
--- a/linuxthreads/sysdeps/unix/sysv/linux/s390/s390-32/sysdep-cancel.h
+++ b/linuxthreads/sysdeps/unix/sysv/linux/s390/s390-32/sysdep-cancel.h
@@ -23,7 +23,7 @@
 # include <linuxthreads/internals.h>
 #endif
 
-#if !defined NOT_IN_libc || defined IS_IN_libpthread
+#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
 
 # undef PSEUDO
 # define PSEUDO(name, syscall_name, args)				      \
@@ -62,9 +62,12 @@ L(pseudo_end):
 # ifdef IS_IN_libpthread
 #  define CENABLE	__pthread_enable_asynccancel
 #  define CDISABLE	__pthread_disable_asynccancel
-# else
+# elif !defined NOT_IN_libc
 #  define CENABLE	__libc_enable_asynccancel
 #  define CDISABLE	__libc_disable_asynccancel
+# else
+#  define CENABLE	__librt_enable_asynccancel
+#  define CDISABLE	__librt_disable_asynccancel
 # endif
 
 #define STM_0		/* Nothing */
diff --git a/linuxthreads/sysdeps/unix/sysv/linux/s390/s390-64/sysdep-cancel.h b/linuxthreads/sysdeps/unix/sysv/linux/s390/s390-64/sysdep-cancel.h
index 4e54e55..e3c2a58 100644
--- a/linuxthreads/sysdeps/unix/sysv/linux/s390/s390-64/sysdep-cancel.h
+++ b/linuxthreads/sysdeps/unix/sysv/linux/s390/s390-64/sysdep-cancel.h
@@ -23,7 +23,7 @@
 # include <linuxthreads/internals.h>
 #endif
 
-#if !defined NOT_IN_libc || defined IS_IN_libpthread
+#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
 
 # undef PSEUDO
 # define PSEUDO(name, syscall_name, args)				      \
@@ -58,10 +58,13 @@ L(pseudo_end):
 #  define CENABLE	__pthread_enable_asynccancel
 #  define CDISABLE	__pthread_disable_asynccancel
 #  define __local_multiple_threads	__pthread_multiple_threads
-# else
+# elif !defined NOT_IN_libc
 #  define CENABLE	__libc_enable_asynccancel
 #  define CDISABLE	__libc_disable_asynccancel
 #  define __local_multiple_threads	__libc_multiple_threads
+# else
+#  define CENABLE	__librt_enable_asynccancel
+#  define CDISABLE	__librt_disable_asynccancel
 # endif
 
 #define STM_0		/* Nothing */
@@ -78,14 +81,31 @@ L(pseudo_end):
 #define LM_4		lmg %r2,%r5,16+160(%r15);
 #define LM_5		lmg %r2,%r5,16+160(%r15);
 
-# ifndef __ASSEMBLER__
+# if !defined NOT_IN_libc || defined IS_IN_libpthread
+#  ifndef __ASSEMBLER__
 extern int __local_multiple_threads attribute_hidden;
-#  define SINGLE_THREAD_P \
+#   define SINGLE_THREAD_P \
   __builtin_expect (__local_multiple_threads == 0, 1)
-# else
-#  define SINGLE_THREAD_P \
+#  else
+#   define SINGLE_THREAD_P \
 	larl	%r1,__local_multiple_threads;				      \
 	icm	%r0,15,0(%r1);
+#  endif
+
+# else
+
+#  ifndef __ASSEMBLER__
+#   define SINGLE_THREAD_P \
+  __builtin_expect (THREAD_GETMEM (THREAD_SELF,				      \
+				   p_header.data.multiple_threads) == 0, 1)
+#  else
+#   define SINGLE_THREAD_P \
+	ear	%r1,%a0;						      \
+	sllg	%r1,%r1,32;						      \
+	ear	%r1,%a1;						      \
+	icm	%r1,15,MULTIPLE_THREADS_OFFSET(%r1);
+#  endif
+
 # endif
 
 #elif !defined __ASSEMBLER__
diff --git a/linuxthreads/sysdeps/unix/sysv/linux/sparc/sparc32/sysdep-cancel.h b/linuxthreads/sysdeps/unix/sysv/linux/sparc/sparc32/sysdep-cancel.h
index 545e1d3..87f7367 100644
--- a/linuxthreads/sysdeps/unix/sysv/linux/sparc/sparc32/sysdep-cancel.h
+++ b/linuxthreads/sysdeps/unix/sysv/linux/sparc/sparc32/sysdep-cancel.h
@@ -23,7 +23,7 @@
 # include <linuxthreads/internals.h>
 #endif
 
-#if !defined NOT_IN_libc || defined IS_IN_libpthread
+#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
 
 # undef PSEUDO
 # define PSEUDO(name, syscall_name, args)				      \
@@ -68,9 +68,12 @@ SYSCALL_ERROR_HANDLER_ENTRY(__syscall_error_handler2)			      \
 # ifdef IS_IN_libpthread
 #  define CENABLE	call __pthread_enable_asynccancel
 #  define CDISABLE	call __pthread_disable_asynccancel
-# else
+# elif defined !NOT_IN_libc
 #  define CENABLE	call __libc_enable_asynccancel
 #  define CDISABLE	call __libc_disable_asynccancel
+# else
+#  define CENABLE	call __librt_enable_asynccancel
+#  define CDISABLE	call __librt_disable_asynccancel
 # endif
 
 #define COPY_ARGS_0	/* Nothing */
diff --git a/linuxthreads/sysdeps/unix/sysv/linux/sparc/sparc64/sysdep-cancel.h b/linuxthreads/sysdeps/unix/sysv/linux/sparc/sparc64/sysdep-cancel.h
index 5a96e7e..7e6d028 100644
--- a/linuxthreads/sysdeps/unix/sysv/linux/sparc/sparc64/sysdep-cancel.h
+++ b/linuxthreads/sysdeps/unix/sysv/linux/sparc/sparc64/sysdep-cancel.h
@@ -23,7 +23,7 @@
 # include <linuxthreads/internals.h>
 #endif
 
-#if !defined NOT_IN_libc || defined IS_IN_libpthread
+#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
 
 # undef PSEUDO
 # define PSEUDO(name, syscall_name, args)				      \
@@ -67,9 +67,12 @@ SYSCALL_ERROR_HANDLER_ENTRY(__syscall_error_handler2)			      \
 # ifdef IS_IN_libpthread
 #  define CENABLE	call __pthread_enable_asynccancel
 #  define CDISABLE	call __pthread_disable_asynccancel
-# else
+# elif !defined NOT_IN_libc
 #  define CENABLE	call __libc_enable_asynccancel
 #  define CDISABLE	call __libc_disable_asynccancel
+# else
+#  define CENABLE	call __librt_enable_asynccancel
+#  define CDISABLE	call __librt_disable_asynccancel
 # endif
 
 #define COPY_ARGS_0	/* Nothing */
diff --git a/linuxthreads/sysdeps/unix/sysv/linux/x86_64/sysdep-cancel.h b/linuxthreads/sysdeps/unix/sysv/linux/x86_64/sysdep-cancel.h
index 4ae543c..742dbeb 100644
--- a/linuxthreads/sysdeps/unix/sysv/linux/x86_64/sysdep-cancel.h
+++ b/linuxthreads/sysdeps/unix/sysv/linux/x86_64/sysdep-cancel.h
@@ -24,7 +24,7 @@
 # include <linuxthreads/internals.h>
 #endif
 
-#if !defined NOT_IN_libc || defined IS_IN_libpthread
+#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
 
 # undef PSEUDO
 # define PSEUDO(name, syscall_name, args)				      \
@@ -94,18 +94,34 @@
 #  define CENABLE	call __pthread_enable_asynccancel;
 #  define CDISABLE	call __pthread_disable_asynccancel;
 #  define __local_multiple_threads __pthread_multiple_threads
-# else
+# elif !defined NOT_IN_libc
 #  define CENABLE	call __libc_enable_asynccancel;
 #  define CDISABLE	call __libc_disable_asynccancel;
 #  define __local_multiple_threads __libc_multiple_threads
+# else
+#  define CENABLE	call __librt_enable_asynccancel@plt;
+#  define CDISABLE	call __librt_disable_asynccancel@plt;
 # endif
 
-# ifndef __ASSEMBLER__
+# if defined IS_IN_libpthread || !defined NOT_IN_libc
+#  ifndef __ASSEMBLER__
 extern int __local_multiple_threads attribute_hidden;
 #   define SINGLE_THREAD_P \
   __builtin_expect (__local_multiple_threads == 0, 1)
+#  else
+#   define SINGLE_THREAD_P cmpl $0, __local_multiple_threads(%rip)
+#  endif
+
 # else
-#  define SINGLE_THREAD_P cmpl $0, __local_multiple_threads(%rip)
+
+#  ifndef __ASSEMBLER__
+#   define SINGLE_THREAD_P \
+  __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
+				   p_header.data.multiple_threads) == 0, 1)
+#  else
+#   define SINGLE_THREAD_P cmpl $0, %fs:MULTIPLE_THREADS_OFFSET
+#  endif
+
 # endif
 
 #elif !defined __ASSEMBLER__
diff --git a/linuxthreads/sysdeps/x86_64/Makefile b/linuxthreads/sysdeps/x86_64/Makefile
new file mode 100644
index 0000000..81bddf6
--- /dev/null
+++ b/linuxthreads/sysdeps/x86_64/Makefile
@@ -0,0 +1,3 @@
+ifeq ($(subdir),csu)
+gen-as-const-headers += tcb-offsets.sym
+endif
diff --git a/linuxthreads/sysdeps/x86_64/tcb-offsets.sym b/linuxthreads/sysdeps/x86_64/tcb-offsets.sym
new file mode 100644
index 0000000..aee6be2
--- /dev/null
+++ b/linuxthreads/sysdeps/x86_64/tcb-offsets.sym
@@ -0,0 +1,4 @@
+#include <sysdep.h>
+#include <tls.h>
+
+MULTIPLE_THREADS_OFFSET		offsetof (tcbhead_t, multiple_threads)
diff --git a/linuxthreads/sysdeps/x86_64/tls.h b/linuxthreads/sysdeps/x86_64/tls.h
index 67e20b2..124c849 100644
--- a/linuxthreads/sysdeps/x86_64/tls.h
+++ b/linuxthreads/sysdeps/x86_64/tls.h
@@ -39,6 +39,7 @@ typedef struct
 			   thread descriptor used by libpthread.  */
   dtv_t *dtv;
   void *self;		/* Pointer to the thread descriptor.  */
+  int multiple_threads;
 } tcbhead_t;
 #endif