nptl: Move stack cache management, __libpthread_freeres into libc

This replaces the FREE_P macro with the __nptl_stack_in_use inline
function.  stack_list_del is renamed to __nptl_stack_list_del,
stack_list_add to __nptl_stack_list_add, __deallocate_stack to
__nptl_deallocate_stack, free_stacks to __nptl_free_stacks.

It is convenient to move __libpthread_freeres into libc at the
same time.  This removes the temporary __default_pthread_attr_freeres
export and restores full freeres coverage for __default_pthread_attr.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 50 insertions, 0 deletions

diff --git a/nptl/nptl-stack.h b/nptl/nptl-stack.h
new file mode 100644
index 0000000000..8631b61816
--- /dev/null
+++ b/nptl/nptl-stack.h
@@ -0,0 +1,50 @@
+/* Stack cache management for NPTL.
+   Copyright (C) 2002-2021 Free Software Foundation, Inc.
+   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/>.  */
+
+#ifndef _NPTL_STACK_H
+#define _NPTL_STACK_H
+
+#include <descr.h>
+#include <list.h>
+#include <stdbool.h>
+
+/* Check whether the stack is still used or not.  */
+static inline bool
+__nptl_stack_in_use (struct pthread *pd)
+{
+  return pd->tid <= 0;
+}
+
+/* Remove the stack ELEM from its list.  */
+void __nptl_stack_list_del (list_t *elem);
+libc_hidden_proto (__nptl_stack_list_del)
+
+/* Add ELEM to a stack list.  LIST can be either &GL (dl_stack_used)
+   or &GL (dl_stack_cache).  */
+void __nptl_stack_list_add (list_t *elem, list_t *list);
+libc_hidden_proto (__nptl_stack_list_add)
+
+/* Free allocated stack.  */
+extern void __nptl_deallocate_stack (struct pthread *pd);
+libc_hidden_proto (__nptl_deallocate_stack)
+
+/* Free stacks until cache size is lower than LIMIT.  */
+void __nptl_free_stacks (size_t limit) attribute_hidden;
+
+#endif /* _NPTL_STACK_H */