diff mbox series

[v4,14/37] nptl: Move __nptl_deallocate_tsd into libc

Message ID 8bbcafe50c2ec48a2c7e03ab0a89778cbdf9a6e2.1618564630.git.fweimer@redhat.com
State Committed
Commit 2cfef0b042561ec2a61cab0a1f3a85a28780985d
Headers show
Series libpthread: Remove NPTL forwarders | expand

Commit Message

Florian Weimer April 16, 2021, 9:21 a.m. UTC
This prepares moving pthread_exit, and later the pthread_key_create
infrastructure.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
---
 nptl/Makefile                       |   1 +
 nptl/Versions                       |   1 +
 nptl/nptl-init.c                    |   1 -
 nptl/nptl_deallocate_tsd.c          | 112 ++++++++++++++++++++++++++++
 nptl/pthreadP.h                     |   3 +-
 nptl/pthread_create.c               |  94 -----------------------
 sysdeps/nptl/libc_start_call_main.h |   5 --
 sysdeps/nptl/pthread-functions.h    |   1 -
 8 files changed, 116 insertions(+), 102 deletions(-)
 create mode 100644 nptl/nptl_deallocate_tsd.c
diff mbox series

Patch

diff --git a/nptl/Makefile b/nptl/Makefile
index ab2c57ad0b..064c342854 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -45,6 +45,7 @@  routines = \
   libc_multiple_threads \
   libc_pthread_init \
   lowlevellock \
+  nptl_deallocate_tsd \
   nptl_nthreads \
   old_pthread_cond_destroy \
   old_pthread_cond_init \
diff --git a/nptl/Versions b/nptl/Versions
index 51f8d65bf9..2fc5cc17ef 100644
--- a/nptl/Versions
+++ b/nptl/Versions
@@ -106,6 +106,7 @@  libc {
     __lll_lock_wait_private;
     __lll_trylock_elision;
     __lll_unlock_elision;
+    __nptl_deallocate_tsd;
     __nptl_nthreads;
     __pthread_attr_copy;
     __pthread_attr_destroy;
diff --git a/nptl/nptl-init.c b/nptl/nptl-init.c
index aad4f21f74..701876dd5d 100644
--- a/nptl/nptl-init.c
+++ b/nptl/nptl-init.c
@@ -93,7 +93,6 @@  static const struct pthread_functions pthread_functions =
     .ptr___pthread_key_create = __pthread_key_create,
     .ptr___pthread_getspecific = __pthread_getspecific,
     .ptr___pthread_setspecific = __pthread_setspecific,
-    .ptr__nptl_deallocate_tsd = __nptl_deallocate_tsd,
     .ptr__nptl_setxid = __nptl_setxid,
     .ptr_set_robust = __nptl_set_robust
   };
diff --git a/nptl/nptl_deallocate_tsd.c b/nptl/nptl_deallocate_tsd.c
new file mode 100644
index 0000000000..c665f4a08a
--- /dev/null
+++ b/nptl/nptl_deallocate_tsd.c
@@ -0,0 +1,112 @@ 
+/* Deallocation thread-specific data structures related to pthread_key_create.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <pthreadP.h>
+
+/* Deallocate POSIX thread-local-storage.  */
+void
+__nptl_deallocate_tsd (void)
+{
+  struct pthread *self = THREAD_SELF;
+
+  /* Maybe no data was ever allocated.  This happens often so we have
+     a flag for this.  */
+  if (THREAD_GETMEM (self, specific_used))
+    {
+      size_t round;
+      size_t cnt;
+
+      round = 0;
+      do
+        {
+          size_t idx;
+
+          /* So far no new nonzero data entry.  */
+          THREAD_SETMEM (self, specific_used, false);
+
+          for (cnt = idx = 0; cnt < PTHREAD_KEY_1STLEVEL_SIZE; ++cnt)
+            {
+              struct pthread_key_data *level2;
+
+              level2 = THREAD_GETMEM_NC (self, specific, cnt);
+
+              if (level2 != NULL)
+                {
+                  size_t inner;
+
+                  for (inner = 0; inner < PTHREAD_KEY_2NDLEVEL_SIZE;
+                       ++inner, ++idx)
+                    {
+                      void *data = level2[inner].data;
+
+                      if (data != NULL)
+                        {
+                          /* Always clear the data.  */
+                          level2[inner].data = NULL;
+
+                          /* Make sure the data corresponds to a valid
+                             key.  This test fails if the key was
+                             deallocated and also if it was
+                             re-allocated.  It is the user's
+                             responsibility to free the memory in this
+                             case.  */
+                          if (level2[inner].seq
+                              == __pthread_keys[idx].seq
+                              /* It is not necessary to register a destructor
+                                 function.  */
+                              && __pthread_keys[idx].destr != NULL)
+                            /* Call the user-provided destructor.  */
+                            __pthread_keys[idx].destr (data);
+                        }
+                    }
+                }
+              else
+                idx += PTHREAD_KEY_1STLEVEL_SIZE;
+            }
+
+          if (THREAD_GETMEM (self, specific_used) == 0)
+            /* No data has been modified.  */
+            goto just_free;
+        }
+      /* We only repeat the process a fixed number of times.  */
+      while (__builtin_expect (++round < PTHREAD_DESTRUCTOR_ITERATIONS, 0));
+
+      /* Just clear the memory of the first block for reuse.  */
+      memset (&THREAD_SELF->specific_1stblock, '\0',
+              sizeof (self->specific_1stblock));
+
+    just_free:
+      /* Free the memory for the other blocks.  */
+      for (cnt = 1; cnt < PTHREAD_KEY_1STLEVEL_SIZE; ++cnt)
+        {
+          struct pthread_key_data *level2;
+
+          level2 = THREAD_GETMEM_NC (self, specific, cnt);
+          if (level2 != NULL)
+            {
+              /* The first block is allocated as part of the thread
+                 descriptor.  */
+              free (level2);
+              THREAD_SETMEM_NC (self, specific, cnt, NULL);
+            }
+        }
+
+      THREAD_SETMEM (self, specific_used, false);
+    }
+}
+libc_hidden_def (__nptl_deallocate_tsd)
diff --git a/nptl/pthreadP.h b/nptl/pthreadP.h
index c6f95c70a1..b47c4c5be1 100644
--- a/nptl/pthreadP.h
+++ b/nptl/pthreadP.h
@@ -686,7 +686,8 @@  extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
 extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
 					  int execute);
 
-extern void __nptl_deallocate_tsd (void) attribute_hidden;
+extern void __nptl_deallocate_tsd (void);
+libc_hidden_proto (__nptl_deallocate_tsd)
 
 extern void __nptl_setxid_error (struct xid_command *cmdp, int error)
   attribute_hidden;
diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c
index 350bf03f5d..58e10e7741 100644
--- a/nptl/pthread_create.c
+++ b/nptl/pthread_create.c
@@ -242,100 +242,6 @@  __find_in_stack_list (struct pthread *pd)
 }
 
 
-/* Deallocate POSIX thread-local-storage.  */
-void
-attribute_hidden
-__nptl_deallocate_tsd (void)
-{
-  struct pthread *self = THREAD_SELF;
-
-  /* Maybe no data was ever allocated.  This happens often so we have
-     a flag for this.  */
-  if (THREAD_GETMEM (self, specific_used))
-    {
-      size_t round;
-      size_t cnt;
-
-      round = 0;
-      do
-	{
-	  size_t idx;
-
-	  /* So far no new nonzero data entry.  */
-	  THREAD_SETMEM (self, specific_used, false);
-
-	  for (cnt = idx = 0; cnt < PTHREAD_KEY_1STLEVEL_SIZE; ++cnt)
-	    {
-	      struct pthread_key_data *level2;
-
-	      level2 = THREAD_GETMEM_NC (self, specific, cnt);
-
-	      if (level2 != NULL)
-		{
-		  size_t inner;
-
-		  for (inner = 0; inner < PTHREAD_KEY_2NDLEVEL_SIZE;
-		       ++inner, ++idx)
-		    {
-		      void *data = level2[inner].data;
-
-		      if (data != NULL)
-			{
-			  /* Always clear the data.  */
-			  level2[inner].data = NULL;
-
-			  /* Make sure the data corresponds to a valid
-			     key.  This test fails if the key was
-			     deallocated and also if it was
-			     re-allocated.  It is the user's
-			     responsibility to free the memory in this
-			     case.  */
-			  if (level2[inner].seq
-			      == __pthread_keys[idx].seq
-			      /* It is not necessary to register a destructor
-				 function.  */
-			      && __pthread_keys[idx].destr != NULL)
-			    /* Call the user-provided destructor.  */
-			    __pthread_keys[idx].destr (data);
-			}
-		    }
-		}
-	      else
-		idx += PTHREAD_KEY_1STLEVEL_SIZE;
-	    }
-
-	  if (THREAD_GETMEM (self, specific_used) == 0)
-	    /* No data has been modified.  */
-	    goto just_free;
-	}
-      /* We only repeat the process a fixed number of times.  */
-      while (__builtin_expect (++round < PTHREAD_DESTRUCTOR_ITERATIONS, 0));
-
-      /* Just clear the memory of the first block for reuse.  */
-      memset (&THREAD_SELF->specific_1stblock, '\0',
-	      sizeof (self->specific_1stblock));
-
-    just_free:
-      /* Free the memory for the other blocks.  */
-      for (cnt = 1; cnt < PTHREAD_KEY_1STLEVEL_SIZE; ++cnt)
-	{
-	  struct pthread_key_data *level2;
-
-	  level2 = THREAD_GETMEM_NC (self, specific, cnt);
-	  if (level2 != NULL)
-	    {
-	      /* The first block is allocated as part of the thread
-		 descriptor.  */
-	      free (level2);
-	      THREAD_SETMEM_NC (self, specific, cnt, NULL);
-	    }
-	}
-
-      THREAD_SETMEM (self, specific_used, false);
-    }
-}
-
-
 /* Deallocate a thread's stack after optionally making sure the thread
    descriptor is still valid.  */
 void
diff --git a/sysdeps/nptl/libc_start_call_main.h b/sysdeps/nptl/libc_start_call_main.h
index 112cc20a7a..c579c65f78 100644
--- a/sysdeps/nptl/libc_start_call_main.h
+++ b/sysdeps/nptl/libc_start_call_main.h
@@ -60,12 +60,7 @@  __libc_start_call_main (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
   else
     {
       /* Remove the thread-local data.  */
-# ifdef SHARED
-      PTHFCT_CALL (ptr__nptl_deallocate_tsd, ());
-# else
-      extern void __nptl_deallocate_tsd (void) __attribute ((weak));
       __nptl_deallocate_tsd ();
-# endif
 
       /* One less thread.  Decrement the counter.  If it is zero we
          terminate the entire process.  */
diff --git a/sysdeps/nptl/pthread-functions.h b/sysdeps/nptl/pthread-functions.h
index 2fa698b1da..b28b47ab0d 100644
--- a/sysdeps/nptl/pthread-functions.h
+++ b/sysdeps/nptl/pthread-functions.h
@@ -55,7 +55,6 @@  struct pthread_functions
   int (*ptr___pthread_key_create) (pthread_key_t *, void (*) (void *));
   void *(*ptr___pthread_getspecific) (pthread_key_t);
   int (*ptr___pthread_setspecific) (pthread_key_t, const void *);
-  void (*ptr__nptl_deallocate_tsd) (void);
   int (*ptr__nptl_setxid) (struct xid_command *);
   void (*ptr_set_robust) (struct pthread *);
 };