hurd: add gscope support

diff --git a/elf/dl-support.c b/elf/dl-support.c
index 114f77a8e5..b5f10d5aa5 100644
--- a/elf/dl-support.c
+++ b/elf/dl-support.c
@@ -188,6 +188,9 @@  int (*_dl_make_stack_executable_hook) (void **) = _dl_make_stack_executable;
 /* Function in libpthread to wait for termination of lookups.  */
 void (*_dl_wait_lookup_done) (void);
 
+#if !THREAD_GSCOPE_IN_TCB
+int _dl_thread_gscope_count;
+#endif
 struct dl_scope_free_list *_dl_scope_free_list;
 
 #ifdef NEED_DL_SYSINFO
diff --git a/sysdeps/aarch64/nptl/tls.h b/sysdeps/aarch64/nptl/tls.h
index ac39c24045..200334f84a 100644
--- a/sysdeps/aarch64/nptl/tls.h
+++ b/sysdeps/aarch64/nptl/tls.h
@@ -109,6 +109,7 @@  typedef struct
   descr->member[idx] = (value)
 
 /* Get and set the global scope generation counter in struct pthread.  */
+# define THREAD_GSCOPE_IN_TCB      1
 # define THREAD_GSCOPE_FLAG_UNUSED 0
 # define THREAD_GSCOPE_FLAG_USED   1
 # define THREAD_GSCOPE_FLAG_WAIT   2
diff --git a/sysdeps/alpha/nptl/tls.h b/sysdeps/alpha/nptl/tls.h
index 084aba931b..482c8f855c 100644
--- a/sysdeps/alpha/nptl/tls.h
+++ b/sysdeps/alpha/nptl/tls.h
@@ -103,6 +103,7 @@  typedef struct
   descr->member[idx] = (value)
 
 /* Get and set the global scope generation counter in struct pthread.  */
+#define THREAD_GSCOPE_IN_TCB      1
 #define THREAD_GSCOPE_FLAG_UNUSED 0
 #define THREAD_GSCOPE_FLAG_USED   1
 #define THREAD_GSCOPE_FLAG_WAIT   2
diff --git a/sysdeps/arm/nptl/tls.h b/sysdeps/arm/nptl/tls.h
index bbe2cd885e..ca0352dafc 100644
--- a/sysdeps/arm/nptl/tls.h
+++ b/sysdeps/arm/nptl/tls.h
@@ -100,6 +100,7 @@  typedef struct
   descr->member[idx] = (value)
 
 /* Get and set the global scope generation counter in struct pthread.  */
+#define THREAD_GSCOPE_IN_TCB      1
 #define THREAD_GSCOPE_FLAG_UNUSED 0
 #define THREAD_GSCOPE_FLAG_USED   1
 #define THREAD_GSCOPE_FLAG_WAIT   2
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 5e1b24ecb5..d3013f6ec6 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -435,6 +435,9 @@  struct rtld_global
     size_t count;
     void *list[50];
   } *_dl_scope_free_list;
+#if !THREAD_GSCOPE_IN_TCB
+  EXTERN int _dl_thread_gscope_count;
+#endif
 #ifdef SHARED
 };
 # define __rtld_global_attribute__
diff --git a/sysdeps/generic/tls.h b/sysdeps/generic/tls.h
index e66b8fd08f..01cbbeb7ba 100644
--- a/sysdeps/generic/tls.h
+++ b/sysdeps/generic/tls.h
@@ -71,4 +71,10 @@ 
      This macro returns the address of the DTV of the current thread.
      This normally is done using the thread register which points
      to the dtv or the TCB (from which the DTV can found).
+
+
+     THREAD_GSCOPE_IN_TCB
+
+     This should be set to 1 if the global scope flag is stored within the TCB.
+     When set to 0, GL(_dl_thread_gscope_count) will be defined to store it.
   */
diff --git a/sysdeps/hppa/nptl/tls.h b/sysdeps/hppa/nptl/tls.h
index a64b150420..2b94e346c1 100644
--- a/sysdeps/hppa/nptl/tls.h
+++ b/sysdeps/hppa/nptl/tls.h
@@ -134,6 +134,7 @@  static inline void __set_cr27(struct pthread *cr27)
 }
 
 /* Get and set the global scope generation counter in struct pthread.  */
+#define THREAD_GSCOPE_IN_TCB      1
 #define THREAD_GSCOPE_FLAG_UNUSED 0
 #define THREAD_GSCOPE_FLAG_USED   1
 #define THREAD_GSCOPE_FLAG_WAIT   2
diff --git a/sysdeps/i386/nptl/tls.h b/sysdeps/i386/nptl/tls.h
index fcda135b7c..8ca0924692 100644
--- a/sysdeps/i386/nptl/tls.h
+++ b/sysdeps/i386/nptl/tls.h
@@ -411,6 +411,7 @@  tls_fill_user_desc (union user_desc_init *desc,
 
 
 /* Get and set the global scope generation counter in the TCB head.  */
+#define THREAD_GSCOPE_IN_TCB      1
 #define THREAD_GSCOPE_FLAG_UNUSED 0
 #define THREAD_GSCOPE_FLAG_USED   1
 #define THREAD_GSCOPE_FLAG_WAIT   2
diff --git a/sysdeps/ia64/nptl/tls.h b/sysdeps/ia64/nptl/tls.h
index 80738f5357..8760ee3b3a 100644
--- a/sysdeps/ia64/nptl/tls.h
+++ b/sysdeps/ia64/nptl/tls.h
@@ -155,6 +155,7 @@  register struct pthread *__thread_self __asm__("r13");
    = THREAD_GET_POINTER_GUARD ())
 
 /* Get and set the global scope generation counter in struct pthread.  */
+#define THREAD_GSCOPE_IN_TCB      1
 #define THREAD_GSCOPE_FLAG_UNUSED 0
 #define THREAD_GSCOPE_FLAG_USED   1
 #define THREAD_GSCOPE_FLAG_WAIT   2
diff --git a/sysdeps/m68k/nptl/tls.h b/sysdeps/m68k/nptl/tls.h
index cadeb84c9a..53be3a02cc 100644
--- a/sysdeps/m68k/nptl/tls.h
+++ b/sysdeps/m68k/nptl/tls.h
@@ -134,6 +134,7 @@  extern void * __m68k_read_tp (void);
 # define NO_TLS_OFFSET		-1
 
 /* Get and set the global scope generation counter in struct pthread.  */
+#define THREAD_GSCOPE_IN_TCB      1
 #define THREAD_GSCOPE_FLAG_UNUSED 0
 #define THREAD_GSCOPE_FLAG_USED   1
 #define THREAD_GSCOPE_FLAG_WAIT   2
diff --git a/sysdeps/mach/hurd/tls.h b/sysdeps/mach/hurd/tls.h
index faff87c7b5..67c657b655 100644
--- a/sysdeps/mach/hurd/tls.h
+++ b/sysdeps/mach/hurd/tls.h
@@ -27,6 +27,7 @@ 
 # include <sysdep.h>
 # include <mach/mig_errors.h>
 # include <mach.h>
+# include <atomic.h>
 
 
 /* This is the size of the initial TCB.  */
@@ -51,6 +52,26 @@ 
 # define GET_DTV(descr) \
   (((tcbhead_t *) (descr))->dtv)
 
+/* Global scope switch support.  */
+#define THREAD_GSCOPE_IN_TCB      0
+#define THREAD_GSCOPE_GLOBAL
+#define THREAD_GSCOPE_SET_FLAG() \
+  atomic_exchange_and_add_acq (&GL(dl_thread_gscope_count), 1)
+#define THREAD_GSCOPE_RESET_FLAG() \
+  do 									      \
+    if (atomic_exchange_and_add_rel (&GL(dl_thread_gscope_count), -1) == 1)   \
+      lll_wake (&GL(dl_thread_gscope_count), 0);			      \
+  while (0)
+#define THREAD_GSCOPE_WAIT() \
+  do 									      \
+    {									      \
+      int count;							      \
+      atomic_write_barrier ();						      \
+      while ((count = GL(dl_thread_gscope_count)))			      \
+        lll_wait (&GL(dl_thread_gscope_count), count, 0);		      \
+    }									      \
+  while (0)
+
 #endif /* !ASSEMBLER */
 
 
diff --git a/sysdeps/microblaze/nptl/tls.h b/sysdeps/microblaze/nptl/tls.h
index aa5e2dd970..8b489740f2 100644
--- a/sysdeps/microblaze/nptl/tls.h
+++ b/sysdeps/microblaze/nptl/tls.h
@@ -116,6 +116,7 @@  typedef struct
   (descr->member[idx] = (value))
 
 /* Get and set the global scope generation counter in struct pthread.  */
+# define THREAD_GSCOPE_IN_TCB      1
 # define THREAD_GSCOPE_FLAG_UNUSED 0
 # define THREAD_GSCOPE_FLAG_USED   1
 # define THREAD_GSCOPE_FLAG_WAIT   2
diff --git a/sysdeps/mips/nptl/tls.h b/sysdeps/mips/nptl/tls.h
index 5f8cd2158c..777432fe1a 100644
--- a/sysdeps/mips/nptl/tls.h
+++ b/sysdeps/mips/nptl/tls.h
@@ -159,6 +159,7 @@  typedef struct
 # define NO_TLS_OFFSET		-1
 
 /* Get and set the global scope generation counter in struct pthread.  */
+#define THREAD_GSCOPE_IN_TCB      1
 #define THREAD_GSCOPE_FLAG_UNUSED 0
 #define THREAD_GSCOPE_FLAG_USED   1
 #define THREAD_GSCOPE_FLAG_WAIT   2
diff --git a/sysdeps/nios2/nptl/tls.h b/sysdeps/nios2/nptl/tls.h
index 47c7a877dc..6fedb2a556 100644
--- a/sysdeps/nios2/nptl/tls.h
+++ b/sysdeps/nios2/nptl/tls.h
@@ -137,6 +137,7 @@  register struct pthread *__thread_self __asm__("r23");
 # define NO_TLS_OFFSET		-1
 
 /* Get and set the global scope generation counter in struct pthread.  */
+#define THREAD_GSCOPE_IN_TCB      1
 #define THREAD_GSCOPE_FLAG_UNUSED 0
 #define THREAD_GSCOPE_FLAG_USED   1
 #define THREAD_GSCOPE_FLAG_WAIT   2
diff --git a/sysdeps/powerpc/nptl/tls.h b/sysdeps/powerpc/nptl/tls.h
index 2418998d34..f88fed5ecf 100644
--- a/sysdeps/powerpc/nptl/tls.h
+++ b/sysdeps/powerpc/nptl/tls.h
@@ -236,6 +236,7 @@  register void *__thread_register __asm__ ("r13");
 # define NO_TLS_OFFSET		-1
 
 /* Get and set the global scope generation counter in struct pthread.  */
+#define THREAD_GSCOPE_IN_TCB      1
 #define THREAD_GSCOPE_FLAG_UNUSED 0
 #define THREAD_GSCOPE_FLAG_USED   1
 #define THREAD_GSCOPE_FLAG_WAIT   2
diff --git a/sysdeps/s390/nptl/tls.h b/sysdeps/s390/nptl/tls.h
index 63411e51b0..37692e96ed 100644
--- a/sysdeps/s390/nptl/tls.h
+++ b/sysdeps/s390/nptl/tls.h
@@ -169,6 +169,7 @@  typedef struct
 #define THREAD_COPY_POINTER_GUARD(descr)
 
 /* Get and set the global scope generation counter in struct pthread.  */
+#define THREAD_GSCOPE_IN_TCB      1
 #define THREAD_GSCOPE_FLAG_UNUSED 0
 #define THREAD_GSCOPE_FLAG_USED   1
 #define THREAD_GSCOPE_FLAG_WAIT   2
diff --git a/sysdeps/sh/nptl/tls.h b/sysdeps/sh/nptl/tls.h
index adb35eaf7d..2585312f27 100644
--- a/sysdeps/sh/nptl/tls.h
+++ b/sysdeps/sh/nptl/tls.h
@@ -141,6 +141,7 @@  typedef struct
      ((tcbhead_t *) (descr + 1))->pointer_guard	= __tcbp->pointer_guard;})
 
 /* Get and set the global scope generation counter in struct pthread.  */
+#define THREAD_GSCOPE_IN_TCB      1
 #define THREAD_GSCOPE_FLAG_UNUSED 0
 #define THREAD_GSCOPE_FLAG_USED   1
 #define THREAD_GSCOPE_FLAG_WAIT   2
diff --git a/sysdeps/sparc/nptl/tls.h b/sysdeps/sparc/nptl/tls.h
index d8548f3573..8a547f138e 100644
--- a/sysdeps/sparc/nptl/tls.h
+++ b/sysdeps/sparc/nptl/tls.h
@@ -141,6 +141,7 @@  register struct pthread *__thread_self __asm__("%g7");
   ((descr)->header.pointer_guard = THREAD_GET_POINTER_GUARD ())
 
 /* Get and set the global scope generation counter in struct pthread.  */
+#define THREAD_GSCOPE_IN_TCB      1
 #define THREAD_GSCOPE_FLAG_UNUSED 0
 #define THREAD_GSCOPE_FLAG_USED   1
 #define THREAD_GSCOPE_FLAG_WAIT   2
diff --git a/sysdeps/tile/nptl/tls.h b/sysdeps/tile/nptl/tls.h
index 2cb30592f0..45d6c53e21 100644
--- a/sysdeps/tile/nptl/tls.h
+++ b/sysdeps/tile/nptl/tls.h
@@ -157,6 +157,7 @@  register void *__thread_pointer asm ("tp");
 # define NO_TLS_OFFSET		-1
 
 /* Get and set the global scope generation counter in struct pthread.  */
+#define THREAD_GSCOPE_IN_TCB      1
 #define THREAD_GSCOPE_FLAG_UNUSED 0
 #define THREAD_GSCOPE_FLAG_USED   1
 #define THREAD_GSCOPE_FLAG_WAIT   2
diff --git a/sysdeps/x86_64/nptl/tls.h b/sysdeps/x86_64/nptl/tls.h
index bdd02376f9..059f9675a0 100644
--- a/sysdeps/x86_64/nptl/tls.h
+++ b/sysdeps/x86_64/nptl/tls.h
@@ -343,6 +343,7 @@  typedef struct
 
 
 /* Get and set the global scope generation counter in the TCB head.  */
+# define THREAD_GSCOPE_IN_TCB      1
 # define THREAD_GSCOPE_FLAG_UNUSED 0
 # define THREAD_GSCOPE_FLAG_USED   1
 # define THREAD_GSCOPE_FLAG_WAIT   2