* allocatestack.c (queue_stack): Move freeing of surplus stacks to...

	(free_stacks): ...here.
	(__free_stack_cache): New function.
	* pthreadP.h: Declare __free_stack_cache.
	* sysdeps/pthread/pthread-functions.h (pthread_functions): Add
	ptr_freeres.
	* init.c (pthread_functions): Initialize ptr_freeres.
	* sysdeps/unix/sysv/linux/libc_pthread_init.c (freeres_libptread):
	New freeres function.

6 files changed, 72 insertions, 35 deletions

diff --git a/nptl/ChangeLog b/nptl/ChangeLog
index aacea77835..7ed7b38e11 100644
--- a/nptl/ChangeLog
+++ b/nptl/ChangeLog
@@ -1,3 +1,15 @@
+2006-08-23  Ulrich Drepper  <drepper@redhat.com>
+
+	* allocatestack.c (queue_stack): Move freeing of surplus stacks to...
+	(free_stacks): ...here.
+	(__free_stack_cache): New function.
+	* pthreadP.h: Declare __free_stack_cache.
+	* sysdeps/pthread/pthread-functions.h (pthread_functions): Add
+	ptr_freeres.
+	* init.c (pthread_functions): Initialize ptr_freeres.
+	* sysdeps/unix/sysv/linux/libc_pthread_init.c (freeres_libptread):
+	New freeres function.
+
 2006-07-30  Joseph S. Myers  <joseph@codesourcery.com>
 
 	[BZ #3018]
diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c
index 4a1cd18481..c05cd47dff 100644
--- a/nptl/allocatestack.c
+++ b/nptl/allocatestack.c
@@ -211,6 +211,45 @@ get_cached_stack (size_t *sizep, void **memp)
 }
 
 
+/* Free stacks until cache size is lower than LIMIT.  */
+static void
+free_stacks (size_t limit)
+{
+  /* We reduce the size of the cache.  Remove the last entries until
+     the size is below the limit.  */
+  list_t *entry;
+  list_t *prev;
+
+  /* Search from the end of the list.  */
+  list_for_each_prev_safe (entry, prev, &stack_cache)
+    {
+      struct pthread *curr;
+
+      curr = list_entry (entry, struct pthread, list);
+      if (FREE_P (curr))
+	{
+	  /* Unlink the block.  */
+	  list_del (entry);
+
+	  /* Account for the freed memory.  */
+	  stack_cache_actsize -= curr->stackblock_size;
+
+	  /* Free the memory associated with the ELF TLS.  */
+	  _dl_deallocate_tls (TLS_TPADJ (curr), false);
+
+	  /* Remove this block.  This should never fail.  If it does
+	     something is really wrong.  */
+	  if (munmap (curr->stackblock, curr->stackblock_size) != 0)
+	    abort ();
+
+	  /* Maybe we have freed enough.  */
+	  if (stack_cache_actsize <= limit)
+	    break;
+	}
+    }
+}
+
+
 /* Add a stack frame which is not used anymore to the stack.  Must be
    called with the cache lock held.  */
 static inline void
@@ -224,40 +263,15 @@ queue_stack (struct pthread *stack)
 
   stack_cache_actsize += stack->stackblock_size;
   if (__builtin_expect (stack_cache_actsize > stack_cache_maxsize, 0))
-    {
-      /* We reduce the size of the cache.  Remove the last entries
-	 until the size is below the limit.  */
-      list_t *entry;
-      list_t *prev;
-
-      /* Search from the end of the list.  */
-      list_for_each_prev_safe (entry, prev, &stack_cache)
-	{
-	  struct pthread *curr;
-
-	  curr = list_entry (entry, struct pthread, list);
-	  if (FREE_P (curr))
-	    {
-	      /* Unlink the block.  */
-	      list_del (entry);
-
-	      /* Account for the freed memory.  */
-	      stack_cache_actsize -= curr->stackblock_size;
-
-	      /* Free the memory associated with the ELF TLS.  */
-	      _dl_deallocate_tls (TLS_TPADJ (curr), false);
+    free_stacks (stack_cache_maxsize);
+}
 
-	      /* Remove this block.  This should never fail.  If it
-		 does something is really wrong.  */
-	      if (munmap (curr->stackblock, curr->stackblock_size) != 0)
-		abort ();
 
-	      /* Maybe we have freed enough.  */
-	      if (stack_cache_actsize <= stack_cache_maxsize)
-		break;
-	    }
-	}
-    }
+/* This function is called indirectly from the freeres code in libc.  */
+void
+__free_stack_cache (void)
+{
+  free_stacks (0);
 }
 
 
diff --git a/nptl/init.c b/nptl/init.c
index 7cfe803c42..14441153b8 100644
--- a/nptl/init.c
+++ b/nptl/init.c
@@ -136,7 +136,9 @@ static const struct pthread_functions pthread_functions =
     .ptr_nthreads = &__nptl_nthreads,
     .ptr___pthread_unwind = &__pthread_unwind,
     .ptr__nptl_deallocate_tsd = __nptl_deallocate_tsd,
-    .ptr__nptl_setxid = __nptl_setxid
+    .ptr__nptl_setxid = __nptl_setxid,
+    /* For now only the stack cache needs to be freed.  */
+    .ptr_freeres = __free_stack_cache
   };
 # define ptr_pthread_functions &pthread_functions
 #else
diff --git a/nptl/pthreadP.h b/nptl/pthreadP.h
index 503e99b2b4..f9634ab0ff 100644
--- a/nptl/pthreadP.h
+++ b/nptl/pthreadP.h
@@ -543,6 +543,8 @@ extern void __nptl_deallocate_tsd (void) attribute_hidden;
 
 extern int __nptl_setxid (struct xid_command *cmdp) attribute_hidden;
 
+extern void __free_stack_cache (void) attribute_hidden;
+
 #ifdef SHARED
 # define PTHREAD_STATIC_FN_REQUIRE(name)
 #else
diff --git a/nptl/sysdeps/pthread/pthread-functions.h b/nptl/sysdeps/pthread/pthread-functions.h
index d75bbbb11e..74d24005c3 100644
--- a/nptl/sysdeps/pthread/pthread-functions.h
+++ b/nptl/sysdeps/pthread/pthread-functions.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
 
@@ -95,6 +95,7 @@ struct pthread_functions
        __attribute ((noreturn)) __cleanup_fct_attribute;
   void (*ptr__nptl_deallocate_tsd) (void);
   int (*ptr__nptl_setxid) (struct xid_command *);
+  void (*ptr_freeres) (void);
 };
 
 /* Variable in libc.so.  */
diff --git a/nptl/sysdeps/unix/sysv/linux/libc_pthread_init.c b/nptl/sysdeps/unix/sysv/linux/libc_pthread_init.c
index 4e60596f7d..7c21d88ef3 100644
--- a/nptl/sysdeps/unix/sysv/linux/libc_pthread_init.c
+++ b/nptl/sysdeps/unix/sysv/linux/libc_pthread_init.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2003, 2005, 2006 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
 
@@ -57,3 +57,9 @@ __libc_pthread_init (ptr, reclaim, functions)
   return &__libc_multiple_threads;
 #endif
 }
+
+
+libc_freeres_fn (freeres_libptread)
+{
+  __libc_pthread_functions.ptr_freeres ();
+}